feat: improve times_tracked history display utility

preparation for state update notes

.github/workflows/ci.yml

@@ -0,0 +1,57 @@
+on: [push, pull_request, create]
+jobs:
+  build:
+    env:
+      CARGO_PROFILE_TEST_BUILD_OVERRIDE_DEBUG: true
+      CARGO_PROFILE_dev_OPT_LEVEL: 0
+      RUSTFLAGS: ""
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        # https://docs.github.com/en/actions/using-jobs/using-a-matrix-for-your-jobs
+        os: [ubuntu-latest, windows-latest, macos-latest]
+        jdk: [11]
+    steps:
+    - uses: actions/checkout@v4
+    - uses: actions-rust-lang/setup-rust-toolchain@v1
+    - name: Install libdbus on Ubuntu
+      if: matrix.os == 'ubuntu-latest'
+      run: |
+        sudo apt-get update
+        sudo apt-get install -y libdbus-1-dev
+    - run: cargo test
+    - run: cargo build --release
+    - uses: actions/upload-artifact@v4
+      with:
+        name: mostr_${{ github.sha }}_${{ matrix.os }}
+        path: |
+          target/release/mostr
+          target/release/mostr.exe
+  #build-arm:
+  #  runs-on: ${{ matrix.os }}
+  #  if: startsWith(github.ref, 'refs/tags/')
+  #  strategy:
+  #    matrix:
+  #      os: [macos-latest-large]
+  #      jdk: [11]
+  #  steps:
+  #  - uses: actions/checkout@v4
+  #  - uses: actions-rust-lang/setup-rust-toolchain@v1
+  #  - run: cargo test --all-features
+  #release:
+  #  needs: [build, build-arm]
+  #  runs-on: ubuntu-latest
+  #  if: startsWith(github.ref, 'refs/tags/')
+  #  steps:
+  #  - uses: actions/download-artifact@v4 # https://github.com/actions/download-artifact
+  #    with:
+  #      pattern: software-challenge-gui-${{ github.sha }}-*
+  #      path: build
+  #      merge-multiple: true
+  #  - name: Release ${{ github.ref }}
+  #    uses: softprops/action-gh-release@v1 # https://github.com/softprops/action-gh-release
+  #    with:
+  #      files: build/*.jar
+  #    env:
+  #      GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -1,6 +1,3 @@
 /target
-
-relays
-keys
-*.html
-/src/bin
+/.idea
+*.html

Cargo.toml

@@ -5,19 +5,38 @@ repository  = "https://forge.ftt.gmbh/janek/mostr"
 readme = "README.md"
 license = "GPL 3.0"
 authors = ["melonion"]
-version = "0.2.0"
+version = "0.7.1"
+rust-version = "1.82"
 edition = "2021"
 default-run = "mostr"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-xdg = "2.5.2"
-itertools = "0.12.1"
-log = "0.4.21"
-chrono = "0.4.38"
-colog = "1.3.0"
-colored = "2.1.0"
-nostr-sdk = "0.30"
-tokio = { version = "1.0.0", features = ["rt", "rt-multi-thread", "macros"] }
-once_cell = "1.19.0"
+# Basics
+tokio = { version = "1.42", features = ["rt", "rt-multi-thread", "macros"] }
+regex = "1.10.6"
+# System
+log = "0.4"
+env_logger = "0.11"
+colog = "1.3"
+colored = "2.1"
+rustyline = { git = "https://github.com/xeruf/rustyline", rev = "465b14d" }
+# OS-Specific Abstractions
+keyring = "3"
+directories = "5.0"
+whoami = "1.5"
+# slint = "1.8"
+# Application Utils
+itertools = "0.12"
+chrono = "0.4"
+parse_datetime = "0.5.0"
+interim = { version = "0.1", features = ["chrono"] }
+nostr-sdk = { git = "https://github.com/rust-nostr/nostr", rev = "e82bc787bdd8490ceadb034fe4483e4df1e91b2a" }
+
+[dev-dependencies]
+mostr = { path = ".", default-features = false }
+
+[features]
+default = ["persistence"]
+persistence = ["keyring/apple-native", "keyring/windows-native", "keyring/linux-native-sync-persistent", "keyring/crypto-rust"]

DESIGN.md

@@ -0,0 +1,44 @@
+# Mostr Design & Internals
+
+## Nostr Reference
+
+All used nostr kinds are listed on the top of [kinds.rs](./src/kinds.rs)
+
+Mostr mainly uses the following [NIPs](https://github.com/nostr-protocol/nips):
+
+- Kind 1 for task descriptions and permanent tasks, can contain task property updates (tags, priority)
+- Issue Tracking: https://github.com/nostr-protocol/nips/blob/master/34.md
+    + Tasks have Kind 1621 (originally: git issue - currently no markdown support implemented)
+    + TBI: Kind 1622 for task comments
+    + Kind 1630-1633: Task Status (1630 Open, 1631 Done, 1632 Closed, 1633 Pending)
+- Own Kind 1650 for time-tracking
+
+Considering to use Calendar: https://github.com/nostr-protocol/nips/blob/master/52.md
+
+- Kind 31922 for GANTT, since it has only Date
+- Kind 31923 for Calendar, since it has a time
+
+## Immutability
+
+Apart from user-specific temporary utilities such as the Bookmark List (Kind 10003),
+all shared data is immutable, and modifications are recorded as separate events,
+providing full audit security.
+Deletions are not considered.
+
+### Timestamps
+
+Mostr provides convenient helpers to backdate an action to a limited extent.
+But when closing one task with `)10` at 10:00 of the current day
+and starting another with `(10` on the same day,
+depending on the order of the event ids,
+the started task would be terminated immediately
+due to the equal timestamp.
+
+That is why I decided to subtract one second from the timestamp
+whenever timetracking is stopped,
+making sure that the stop event always happens before the start event
+when the same timestamp is provided in the interface.
+Since the user interface is anyways focused on comprehensible output
+and thus slightly fuzzy,
+I then also add one second to each timestamp displayed
+to make the displayed timestamps more intuitive.

README.md

@@ -1,95 +1,328 @@
 # mostr
 
-A nested task chat, powered by nostr!
+An immutable nested collaborative task manager, powered by nostr!
+
+> Mostr is beta software. 
+> Do not entrust it exclusively with your data unless you know what you are doing!
+
+> Intermediate versions might not properly persist all changes.
+> A failed relay connection currently looses all intermediate changes.
 
 ## Quickstart
 
-First, start a nostr relay, such as
-- https://github.com/coracle-social/bucket for local development
-- https://github.com/rnostr/rnostr for production use
-
-Run development build with:
+Install rust(up) and run a development build with:
 
     cargo run
 
-Creating a test task: 
-`nostril --envelope --content "test task" --kind 1621 | websocat ws://localhost:4736`
+A `relay` list can be placed in a config file
+under `${XDG_CONFIG_HOME:-$HOME/.config}/mostr/`.
+Ideally any project with different collaborators has its own relay.
+If not saved, mostr will ask for a relay url
+(entering none is fine too, but your data will not be persisted between sessions)
+and a private key, alternatively generating one on the fly.
+The key is saved in the system keychain.
 
 Install latest build:
 
-    cargo install --path . --offline
+    cargo install --path .
 
-## Principles
+This one-liner can help you stay on the latest version
+(optionally add a `cd` to your mostr-directory in front to use it anywhere):
 
-- active task is tracked automatically
-- progress through subdivision rather than guessing
-- TBI: show/hide closed/done tasks
+    git pull && cargo install --path . && mostr
 
-Recommendation: Flat hierarchy, using tags for filtering (TBI)
+To exit the application, press `Ctrl-D`.
 
 ## Reference
 
 ### Command Syntax
 
-`TASK` creation syntax: `NAME: TAG1 TAG2 ...`
+Uppercased words are placeholders, brackets enclose optional arguments.
+
+`TASK` creation syntax: `NAME #TAG *PRIO @ASSIGNEE # TAG1 TAG2 ...`
 
 - `TASK` - create task
-- `.` - clear filters and reload
+  + prefix with space if you want a task to start with a command character
+  + paste text with newlines to create one task per line
+- `.` - clear all filters
 - `.TASK`
-  + select task by id
+  + activate task by id
   + match by task name prefix: if one or more tasks match, filter / activate (tries case-sensitive then case-insensitive)
   + no match: create & activate task
-- `.2` - set view depth to `2`, which can be substituted for any number (how many subtask levels to show, default 1)
+- `.2` - set view depth to the given number (how many subtask levels to show, default is 1)
+- `/[TEXT]` - activate task or filter by smart-case substring match (empty: move to root)
+- `||TASK` - create and activate a new task procedure (where subtasks automatically depend on the previously created task)
+- `|[TASK]` - mark current task as procedure or create a sibling task depending on the current one and move up
+- sibling task shortcut?
 
-Dots can be repeated to move to parent tasks
+Dot or slash can be repeated to move to parent tasks before acting.
+Append `@TIME` to any task creation or change command to record the action with the given time.
+To add tags or edit the priority or assignee, make the change part of a comment or state update:
 
-- `:[IND][COL]` - add / remove property column COL to IND or end
-- `>[TEXT]` - Complete active task and move to parent, with optional state description
-- `<[TEXT]` - Close active task and move to parent, with optional state description
-- `|TEXT` - Set state for current task from text (also aliased to `/` for now)
-- `-TEXT` - add text note (comment / description)
+- `:[IND][PROP]` - add property column PROP at IND or end,
+  if it already exists remove property column PROP or IND; empty: list properties
+- `::[PROP]` - sort by property PROP (multiple space-separated values allowed)
+- `([TIME]` - list tracked times or insert time-tracking with the specified offset (double to view all history)
+  such as `(20` (for 20:00), `(-1d`, `(-15 minutes`, `(yesterday 17:20`, `(in 2 fortnights`
+  - TBI: track whole interval in one with dash
+- `)[TIME]` - stop time-tracking with optional offset (also convenience helper to move to root)
+- `>[TEXT]` - complete active task and move up, with optional status description
+- `<[TEXT]` - close active task and move up, with optional status description
+- `!TEXT` - set status for current task from text and move up; empty: Open
+- `!TIME: REASON` - defer (hide) current task until given time
+- `,[TEXT]` - list notes or add text (activity / task description)
+- TBI: `;[TEXT]` - list comments or comment on task
+- TBI: show status history and creation with attribution
+- `&` - revert
+  - with string argument, find first matching task in history
+  - with int argument, jump back X tasks in history
+  - undo last action (moving in place or upwards confirms pending actions)
+- `*` - (un)bookmark current task or list all bookmarks
+- `wss://...` - switch or subscribe to relay (prefix with space to forcibly add a new one)
 
 Property Filters:
 
-- `#TAG` - filter by tag
-- `?STATE` - filter by state (type or description) - plain `?` to reset
+- `#TAG1 TAG2` - set tag filter
+- `+TAG` - add tag filter (empty: list all used tags)
+- `-TAG` - remove tag filters (by prefix)
+- `?STATUS` - set status filter (type or description) - plain `?` to reset, `??` to show all
+- `*INT` - set priority filter - `**` to reset
+- `@[AUTHOR|TIME]` - filter by time or author (pubkey, or `@` for self, TBI: id prefix, name prefix)
 
-State descriptions can be used for example for Kanban columns.
-An active tag or state filter will also set that attribute for newly created tasks.
+Status descriptions can be used for example for Kanban columns or review flows.
+An active tag or status filter will also set that attribute for newly created tasks.
 
-### Available Columns
+## Basic Usage
 
-- `id`
-- `parentid`
-- `name`
-- `state`
-- `hashtags`
-- `tags` - values of all nostr tags associated with the event, except event tags
-- `desc` - last note on the task
-- `description` - accumulated notes on the task
-- `path` - name including parent tasks
-- `rpath` - name including parent tasks up to active task
-- `time` - time tracked on this task
-- `rtime` - time tracked on this tasks and all recursive subtasks
-- `progress` - recursive subtask completion in percent
-- `subtasks` - how many direct subtasks are complete
+### Navigation and Nesting
 
-For debugging: `props`, `alltags`, `descriptions`
+Create tasks and navigate using the shortcuts below.
+Whichever task is active (selected)
+will be the parent task for newly created tasks
+and automatically has time-tracking running.
+To track task progress,
+simply subdivide the task -
+checking off tasks will automatically update the progress
+for all parent tasks.
+Generally a flat hierarchy is recommended
+with tags for filtering,
+since hierarchies cannot be changed.
+Filtering by a tag is just as easy
+as activating a task and more flexible.
 
-TBI: Combined formatting and recursion specifiers -
-for example progress count/percentage and recursive or not.
-Subtask progress immediate/all/leafs.
+Using subtasks has two main advantages:
+- ability to accumulate time tracked
+- swiftly navigate between related tasks
+
+Managing a project with subtasks makes it continuously visible,
+which is helpful if you want to be able to track time on the project itself
+without a specific task,
+Thus subtasks can be very useful for specific contexts,
+for example a project or a specific place.
+
+On the other hand, related tasks like chores
+should be grouped with a tag instead.
+Similarly for projects which are only sporadically worked on
+when a specific task comes up, so they do not clutter the list.
+
+### Task States
+
+> TODO: Mark as Done vs Closed
+
+### Collaboration
+
+Since everything in mostr is inherently immutable,
+live collaboration is easily possible.
+After every command,
+mostr checks if new updates arrived from the relay
+and updates its display accordingly.
+
+If a relay has a lot of events,
+initial population of data can take a bit -
+but you can already start creating events without issues,
+updates will be fetched in the background.
+For that reason,
+it is recommended to leave mostr running
+as you work.
+
+### Time-Tracking
+
+The currently active task is automatically time-tracked.
+To stop time-tracking completely, simply move to the root of all tasks.
+Time-tracking by default recursively summarizes
+
+### Priorities
+
+Task priorities can be set as any natural number,
+with higher numbers denoting higher priorities.
+The syntax here allows for very convenient incremental usage:
+By default, using priorities between 1 and 9 is recommended,
+with an exemplary interpretation like this:
+
+* 1 Ideas / "Someday"
+* 2 Later
+* 3 Soon
+* 4 Relevant
+* 5 Important
+* 9 DO NOW
+
+Internally, when giving a single digit, a 0 is appended,
+so that the default priorities increment in steps of 10.
+So in case you need more than 10 priorities,
+instead of stacking them on top,
+you can granularly add them in between.
+For example, `12` is in between `1` and `2`
+which are equivalent to `10` and `20`,
+not above `9` but above `09`!
+
+By default, only tasks with priority `35` and upward are shown
+so you can focus on what matters,
+but you can temporarily override that using `**PRIO`.
+
+### Quick Access
+
+Paper-based lists are often popular because you can quickly put down a bunch of items.
+Mostr offers three useful workflows depending on the use-case:
+If you want to TBC...
+
+- temporary task with subtasks (especially handy for progression)
+- Filter by recently created
+- Pin to bookmarks
+- high priority
+
+### Notes
+
+- TBI = To Be Implemented
+- `. TASK` - create and enter a new task even if the name matches an existing one
+
+# Development and Contributions
+
+This Project follows the [Kull Collaboration Convention](https://kull.jfischer.org/),
+especially the commit message format.
+Currently a separate dev branch is maintained because users regularly receive updates via the main branch.
+Once proper packaging is in place, this can be simplified.
+
+## Local Development Tools
+
+Start a nostr relay, such as
+- https://github.com/coracle-social/bucket for local development
+- https://github.com/rnostr/rnostr for production use
+
+To create a test task externally:
+`nostril --envelope --content "test task" --kind 1621 | websocat ws://localhost:4736`
 
 ## Plans
 
-- Relay Selection, fetch most recent tasks first
-- parse Hashtag tags from task name
-- Personal time tracking
-- Unified Filter object
-  -> include sub
-- Time tracking: Active not as task state, ability to postpone task and add planned timestamps (calendar entry)
-- TUI - Clear terminal?
-- Expiry (no need to fetch potential years of history)
-- Offline caching
-- Web Interface, Messenger integrations
-- Relay: filter out task state updates within few seconds, also on client side
+- Handle event sending rejections (e.g. permissions)
+- Local Database Cache, Negentropy Reconciliation
+  -> Offline Use!
+- Remove status filter when moving up?
+- Task markdown support? - colored
+- Calendar Events - make future time-tracking editable -> parametrised replaceable events
+- Speedup: Offline caching & Expiry (no need to fetch potential years of history)
+  + Fetch most recent tasks first
+  + Relay: compress tracked time for old tasks, filter closed tasks
+  + Relay: filter out task status updates within few seconds, also on client side
+
+### Commands
+
+Open Command characters: `_^\=$%~'"`, `{}[]`
+  
+### Conceptual
+
+The following features are not ready to be implemented
+because they need conceptualization.
+Suggestions welcome!
+
+- Queueing tasks
+- Allow adding new parent via description?
+- Special commands: help, exit, tutorial, change log level
+- Duplicate task (subtasks? time-tracking?)
+- What if I want to postpone a procedure, i.e. make it pending, or move it across kanban, does this make sense?
+- Dependencies (change from tags to properties so they can be added later? or maybe as a status?)
+- Templates
+- Ownership
+- Combined formatting and recursion specifiers
+  + progress count/percentage and recursive or not
+  + Subtask progress immediate/all/leafs
+  + path full / leaf / top
+
+### Interfaces & Integrations
+
+- TUI: Clear Terminal? Refresh on empty prompt after timeout?
+- Kanban, GANTT, Calendar
+- n8n node
+- Webcal Feed: Scheduled (planning) / Tracked (events, time-tracking) with args for how far back/forward
+
+Interfaces:
+
+- text-based REPL for terminal and messengers
+- interactive UI for web, mobile, desktop e.g. https://docs.slint.dev/latest/docs/slint/src/introduction/
+
+### Config Files
+
+- format strings
+- thresholds: auto-send message, time-tracking overview interval and count
+- global and per-relay: username, key location, tag mappings (i.e. server implies pc, home implies phys) -> also get from relay
+
+## Exemplary Workflows - User Stories
+
+- Freelancer
+- Family Chore Management
+- Inter-Disciplinary Project Team -> Company with multiple projects and multiple relays
+  + Permissions via status or assignment (reassignment?)
+  + Tasks can be blocked while having a status (e.g. kanban column)
+  + A meeting can be worked on (tracked) before it starts
+  + Schedule for multiple people
+- Tracking Daily Routines / Habits
+
+### Freelancer
+
+For a Freelancer, mostr can help structure work times
+across different projects
+because it can connect to multiple clients,
+using their mental state effectively (Mind Management not Time Management).
+It also enables transparency for clients
+by sharing the tracked time -
+but alternatively the freelancer
+can track times on their own auxiliary relay
+without problems.
+
+### Family
+
+With a mobile client implemented,
+mostr can track shopping lists and other chores for a family,
+and provide them context-dependently -
+allowing you to batch shopping and activities without mental effort.
+
+### Project Team
+
+sharing, assigning, stand-ups, communication
+
+### Contexts
+
+A context is a custom set of filters such as status, tags, assignee
+so that the visible tasks are always relevant
+and newly created tasks are less of a hassle to type out
+since they will automatically take on that context.
+By automating these contexts based on triggers, scripts or time,
+relevant tasks can be surfaced automatically.
+
+#### Vision of Work-Life-Balance for Freelancer
+
+In the morning, your groggy brain is good at divergent thinking,
+and you like to do sports in the morning.
+So for that time, mostr can show you tasks tagged for divergent thinking,
+since you are easily distracted filter out those that require the internet,
+as well as anything sportsy.
+After you come back from sports and had breakfast,
+for example detected through a period of inactivity on your device,
+you are ready for work, so the different work projects are shown and you delve into one.
+After 90 minutes you reach a natural low in your focus,
+so mostr surfaces break activities -
+such as a short walk, a small workout, some instrument practice
+or simply grabbing a snack and drink.
+After lunch you like to take an extended afternoon break,
+so your call list pops up -
+you can give a few people a call as you make a market run,
+before going for siesta.

examples/question.rs

@@ -0,0 +1,22 @@
+use std::collections::HashMap;
+
+fn main() {
+    let mut map: HashMap<usize, String> = HashMap::new();
+    let add_string = |map: &mut HashMap<usize, String>, string: String| {
+        map.insert(string.len(), string);
+    };
+    add_string(&mut map, "hi".to_string());
+    add_string(&mut map, "ho".to_string());
+    map.add_string("hi".to_string());
+    map.add_string("ho".to_string());
+    map.get(&1);
+}
+
+trait InsertString {
+    fn add_string(&mut self, event: String);
+}
+impl InsertString for HashMap<usize, String> {
+    fn add_string(&mut self, event: String) {
+        self.insert(event.len(), event);
+    }
+}

examples/relay-test-0_34.rs

@@ -0,0 +1,24 @@
+use std::time::Duration;
+use nostr_sdk::prelude::*;
+
+#[tokio::main]
+async fn main() {
+    //tracing_subscriber::fmt::init();
+    let client = Client::new(Keys::generate());
+    let result = client.subscribe(vec![Filter::new()], None).await;
+    println!("subscribe: {:?}", result);
+    let result = client.add_relay("ws://localhost:4736").await;
+    println!("add relay: {:?}", result);
+    client.connect().await;
+
+    let mut notifications = client.notifications();
+    let _thread = tokio::spawn(async move {
+        client.send_event_builder(EventBuilder::new(Kind::TextNote, "test")).await;
+        tokio::time::sleep(Duration::from_secs(20)).await;
+    });
+    while let Ok(notification) = notifications.recv().await {
+        if let RelayPoolNotification::Event { event, .. } = notification {
+            println!("At {} found {} kind {} content \"{}\"", event.created_at, event.id, event.kind, event.content);
+        }
+    }
+}

examples/relay-test.rs

@@ -0,0 +1,44 @@
+use nostr_sdk::prelude::*;
+
+#[tokio::main]
+async fn main() {
+    //tracing_subscriber::fmt::init();
+    let client = Client::new(Keys::generate());
+    //let result = client.subscribe(vec![Filter::new()], None).await;
+    //println!("{:?}", result);
+    let mut notifications = client.notifications();
+
+    let result = client.add_relay("ws://localhost:3333").await;
+    println!("{:?}", result);
+    let result = client.connect_relay("ws://localhost:3333").await;
+    println!("{:?}", result);
+
+    //let _thread = tokio::spawn(async move {
+    //    let result = client.add_relay("ws://localhost:4736").await;
+    //    println!("{:?}", result);
+    //    let result = client.connect_relay("ws://localhost:4736").await;
+    //    println!("{:?}", result);
+
+    //    // Block b
+    //    //let result = client.add_relay("ws://localhost:54736").await;
+    //    //println!("{:?}", result);
+    //    //let result = client.connect_relay("ws://localhost:54736").await;
+    //    //println!("{:?}", result);
+
+    //    tokio::time::sleep(Duration::from_secs(20)).await;
+    //});
+
+    loop {
+        match notifications.recv().await {
+            Ok(notification) => {
+                if let RelayPoolNotification::Event { event, .. } = notification {
+                    println!("At {} found {} kind {} content \"{}\"", event.created_at, event.id, event.kind, event.content);
+                }
+            }
+            Err(e) => {
+                println!("Aborting due to {:?}", e);
+                break
+            }
+        }
+    }
+}

examples/rustyline.rs

@@ -0,0 +1,50 @@
+use rustyline::error::ReadlineError;
+use rustyline::{Cmd, ConditionalEventHandler, DefaultEditor, Event, EventContext, EventHandler, KeyEvent, Movement, RepeatCount, Result};
+
+struct CtrlCHandler;
+impl ConditionalEventHandler for CtrlCHandler {
+    fn handle(&self, evt: &Event, n: RepeatCount, positive: bool, ctx: &EventContext) -> Option<Cmd> {
+        Some(if !ctx.line().is_empty() {
+            Cmd::Kill(Movement::WholeLine)
+        } else {
+            Cmd::Interrupt
+        })
+    }
+}
+
+fn main() -> Result<()> {
+    // `()` can be used when no completer is required
+    let mut rl = DefaultEditor::new()?;
+
+    rl.bind_sequence(
+        KeyEvent::ctrl('c'),
+        EventHandler::Conditional(Box::from(CtrlCHandler)));
+    #[cfg(feature = "with-file-history")]
+    if rl.load_history("history.txt").is_err() {
+        println!("No previous history.");
+    }
+    loop {
+        let readline = rl.readline(">> ");
+        match readline {
+            Ok(line) => {
+                rl.add_history_entry(line.as_str());
+                println!("Line: {}", line);
+            },
+            Err(ReadlineError::Interrupted) => {
+                println!("CTRL-C");
+                break
+            },
+            Err(ReadlineError::Eof) => {
+                println!("CTRL-D");
+                break
+            },
+            Err(err) => {
+                println!("Error: {:?}", err);
+                break
+            }
+        }
+    }
+    #[cfg(feature = "with-file-history")]
+    rl.save_history("history.txt");
+    Ok(())
+}

rust-toolchain.toml

@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.82.0"

src/event_sender.rs

@@ -0,0 +1,107 @@
+use std::cell::RefCell;
+use std::ops::Sub;
+
+use nostr_sdk::prelude::*;
+use tokio::sync::mpsc::Sender;
+
+use crate::kinds::TRACKING_KIND;
+use crate::tasks;
+use log::{debug, error, info, trace, warn};
+use nostr_sdk::Event;
+
+const UNDO_DELAY: u64 = 60;
+
+#[derive(Debug, Clone, Eq, PartialEq)]
+pub(crate) enum MostrMessage {
+    Flush,
+    NewRelay(Url),
+    AddTasks(Url, Vec<Event>),
+}
+
+type Events = Vec<Event>;
+
+#[derive(Debug, Clone)]
+pub(crate) struct EventSender {
+    pub(crate) url: Option<Url>,
+    pub(crate) tx: Sender<MostrMessage>,
+    pub(crate) keys: Keys,
+    pub(crate) queue: RefCell<Events>,
+}
+impl EventSender {
+    pub(crate) fn from(url: Option<Url>, tx: &Sender<MostrMessage>, keys: &Keys) -> Self {
+        EventSender {
+            url,
+            tx: tx.clone(),
+            keys: keys.clone(),
+            queue: Default::default(),
+        }
+    }
+
+    // TODO this direly needs testing
+    pub(crate) fn submit(&self, event_builder: EventBuilder) -> Result<Event> {
+        let min = Timestamp::now().sub(UNDO_DELAY);
+        {
+            // Always flush if oldest event older than a minute or newer than now
+            let borrow = self.queue.borrow();
+            if borrow
+                .iter()
+                .any(|e| e.created_at < min || e.created_at > Timestamp::now())
+            {
+                drop(borrow);
+                debug!("Flushing event queue because it is older than a minute");
+                self.force_flush();
+            }
+        }
+        let mut queue = self.queue.borrow_mut();
+        Ok(event_builder.sign_with_keys(&self.keys).inspect(|event| {
+            if event.kind == TRACKING_KIND
+                && event.created_at > min
+                && event.created_at < tasks::now()
+            {
+                // Do not send redundant movements
+                queue.retain(|e| e.kind != TRACKING_KIND);
+            }
+            queue.push(event.clone());
+        })?)
+    }
+    /// Sends all pending events
+    pub(crate) fn force_flush(&self) {
+        debug!("Flushing {} events from queue", self.queue.borrow().len());
+        let values = self.clear();
+        self.url.as_ref().map(|url| {
+            self.tx
+                .try_send(MostrMessage::AddTasks(url.clone(), values))
+                .err()
+                .map(|e| {
+                    error!(
+                        "Nostr communication thread failure, changes will not be persisted: {}",
+                        e
+                    )
+                })
+        });
+    }
+    /// Sends all pending events if there is a non-tracking event
+    pub(crate) fn flush(&self) {
+        if self
+            .queue
+            .borrow()
+            .iter()
+            .any(|event| event.kind != TRACKING_KIND)
+        {
+            self.force_flush()
+        }
+    }
+    pub(crate) fn clear(&self) -> Events {
+        trace!("Cleared queue: {:?}", self.queue.borrow());
+        self.queue.replace(Vec::with_capacity(3))
+    }
+    pub(crate) fn pubkey(&self) -> PublicKey {
+        self.keys.public_key()
+    }
+}
+impl Drop for EventSender {
+    fn drop(&mut self) {
+        self.force_flush();
+        debug!("Dropped {:?}", self);
+    }
+}

src/hashtag.rs

@@ -0,0 +1,99 @@
+use nostr_sdk::{Alphabet, Tag};
+use std::cmp::Ordering;
+use std::fmt::{Display, Formatter};
+use std::hash::{Hash, Hasher};
+
+pub fn is_hashtag(tag: &Tag) -> bool {
+    tag.single_letter_tag()
+        .is_some_and(|letter| letter.character == Alphabet::T)
+}
+
+/// This exists so that Hashtags can easily be matched without caring about case
+/// but displayed in their original case
+#[derive(Clone, Debug)]
+pub struct Hashtag {
+    value: String,
+    lowercased: String,
+}
+
+impl Hashtag {
+    pub fn contains(&self, token: &str) -> bool {
+        self.lowercased.contains(&token.to_ascii_lowercase())
+    }
+    pub fn matches(&self, token: &str) -> bool {
+        token.contains(&self.lowercased)
+    }
+}
+
+impl Display for Hashtag {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        write!(f, "{}", self.value)
+    }
+}
+
+impl Hash for Hashtag {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        state.write(self.lowercased.as_bytes());
+    }
+}
+
+impl Eq for Hashtag {}
+impl PartialEq<Self> for Hashtag {
+    fn eq(&self, other: &Self) -> bool {
+        self.lowercased == other.lowercased
+    }
+}
+impl TryFrom<&Tag> for Hashtag {
+    type Error = String;
+
+    fn try_from(value: &Tag) -> Result<Self, Self::Error> {
+        value.content().take_if(|_| is_hashtag(value))
+            .map(|s| Hashtag::from(s))
+            .ok_or_else(|| "Tag is not a Hashtag".to_string())
+    }
+}
+impl From<&str> for Hashtag {
+    fn from(value: &str) -> Self {
+        let val = value.trim().to_string();
+        Hashtag {
+            lowercased: val.to_ascii_lowercase(),
+            value: val,
+        }
+    }
+}
+impl From<&Hashtag> for Tag {
+    fn from(value: &Hashtag) -> Self {
+        Tag::hashtag(&value.lowercased)
+    }
+}
+
+impl Ord for Hashtag {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.lowercased.cmp(&other.lowercased)
+        // Wanted to do this so lowercase tags are preferred,
+        // but is technically undefined behaviour
+        // because it deviates from Eq implementation
+        //match {
+        //    Ordering::Equal => self.0.cmp(&other.0),
+        //    other => other,
+        //}
+    }
+}
+impl PartialOrd for Hashtag {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.lowercased.cmp(&other.lowercased))
+    }
+}
+
+#[test]
+fn test_hashtag() {
+    assert_eq!("yeah", "YeaH".to_ascii_lowercase());
+    assert_eq!("yeah".to_ascii_lowercase().cmp(&"YeaH".to_ascii_lowercase()), Ordering::Equal);
+
+    use itertools::Itertools;
+    let strings = vec!["yeah", "YeaH"];
+    let mut tags = strings.iter().cloned().map(Hashtag::from).sorted_unstable().collect_vec();
+    assert_eq!(strings, tags.iter().map(ToString::to_string).collect_vec());
+    tags.sort_unstable();
+    assert_eq!(strings, tags.iter().map(ToString::to_string).collect_vec());
+}

src/helpers.rs

@@ -0,0 +1,162 @@
+use std::ops::Sub;
+
+use chrono::LocalResult::Single;
+use chrono::{DateTime, Local, NaiveTime, TimeDelta, TimeZone, Utc};
+use log::{debug, error, info, trace, warn};
+use nostr_sdk::Timestamp;
+
+pub const CHARACTER_THRESHOLD: usize = 3;
+
+pub fn to_string_or_default(arg: Option<impl ToString>) -> String {
+    arg.map(|arg| arg.to_string()).unwrap_or_default()
+}
+
+pub fn some_non_empty(str: &str) -> Option<String> {
+    if str.is_empty() { None } else { Some(str.to_string()) }
+}
+
+pub fn trim_start_count(str: &str, char: char) -> (&str, usize) {
+    let len = str.len();
+    let result = str.trim_start_matches(char);
+    let dots = len - result.len();
+    (result, dots)
+}
+
+pub trait ToTimestamp {
+    fn to_timestamp(&self) -> Timestamp;
+}
+impl<T: TimeZone> ToTimestamp for DateTime<T> {
+    fn to_timestamp(&self) -> Timestamp {
+        let stamp = self.to_utc().timestamp();
+        if let Some(t) = 0u64.checked_add_signed(stamp) {
+            Timestamp::from(t)
+        } else { Timestamp::zero() }
+    }
+}
+
+/// Parses the hour from a plain number in the String,
+/// with max of max_future hours into the future.
+// TODO parse HHMM as well
+pub fn parse_hour(str: &str, max_future: i64) -> Option<DateTime<Local>> {
+    str.parse::<u32>().ok().and_then(|hour| {
+        let now = Local::now();
+        #[allow(deprecated)]
+        now.date().and_hms_opt(hour, 0, 0).map(|time| {
+            if time - now > TimeDelta::hours(max_future) {
+                time.sub(TimeDelta::days(1))
+            } else {
+                time
+            }
+        })
+    })
+}
+
+pub fn parse_date(str: &str) -> Option<DateTime<Utc>> {
+    // Using two libraries for better exhaustiveness, see https://github.com/uutils/parse_datetime/issues/84
+    match interim::parse_date_string(str, Local::now(), interim::Dialect::Us) {
+        Ok(date) => Some(date.to_utc()),
+        Err(e) => {
+            match parse_datetime::parse_datetime_at_date(Local::now(), str) {
+                Ok(date) => Some(date.to_utc()),
+                Err(_) => {
+                    warn!("Could not parse date from \"{str}\": {e}");
+                    None
+                }
+            }
+        }
+    }.map(|time| {
+        // TODO properly map date without time to day start, also support intervals
+        if str.chars().any(|c| c.is_numeric()) {
+            time
+        } else {
+            #[allow(deprecated)]
+            time.date().and_time(NaiveTime::default()).unwrap()
+        }
+    })
+}
+
+/// Turn a human-readable relative timestamp into a nostr Timestamp.
+/// - Plain number as hour, 18 hours back or 6 hours forward
+/// - Number with prefix as minute offset
+/// - Otherwise try to parse a relative date
+pub fn parse_tracking_stamp(str: &str) -> Option<Timestamp> {
+    if let Some(num) = parse_hour(str, 6) {
+        return Some(num.to_timestamp());
+    }
+    let stripped = str.trim().trim_start_matches('+').trim_start_matches("in ");
+    if let Ok(num) = stripped.parse::<i64>() {
+        return Some(Timestamp::from(Timestamp::now().as_u64().saturating_add_signed(num * 60)));
+    }
+    parse_date(str).and_then(|time| {
+        let stamp = time.to_utc().timestamp();
+        if stamp > 0 {
+            Some(Timestamp::from(stamp as u64))
+        } else {
+            warn!("Can only track times after 1970!");
+            None
+        }
+    })
+}
+
+/// Format DateTime easily comprehensible for human but unambiguous.
+/// Length may vary.
+pub fn format_datetime_relative(time: DateTime<Local>) -> String {
+    let date = time.date_naive();
+    let prefix =
+        match Local::now()
+            .date_naive()
+            .signed_duration_since(date)
+            .num_days() {
+            -1 => "tomorrow ".into(),
+            0 => "".into(),
+            1 => "yesterday ".into(),
+            //-3..=3 => date.format("%a ").to_string(),
+            -10..=10 => date.format("%d. %a ").to_string(),
+            -100..=100 => date.format("%a %b %d ").to_string(),
+            _ => date.format("%y-%m-%d %a ").to_string(),
+        };
+    format!("{}{}", prefix, time.format("%H:%M"))
+}
+
+/// Format a nostr timestamp with the given formatting function.
+pub fn format_as_datetime<F>(stamp: &Timestamp, formatter: F) -> String
+where
+    F: Fn(DateTime<Local>) -> String,
+{
+    match Local.timestamp_opt(stamp.as_u64() as i64 + 1, 0) {
+        Single(time) => formatter(time),
+        _ => stamp.to_human_datetime().to_string(),
+    }
+}
+
+/// Format nostr Timestamp relative to local time
+/// with optional day specifier or full date depending on distance to today.
+pub fn format_timestamp_relative(stamp: &Timestamp) -> String {
+    format_as_datetime(stamp, format_datetime_relative)
+}
+
+/// Format nostr timestamp with the given format.
+pub fn format_timestamp(stamp: &Timestamp, format: &str) -> String {
+    format_as_datetime(stamp, |time| time.format(format).to_string())
+}
+
+/// Format nostr timestamp in a sensible comprehensive format with consistent length and consistent sorting.
+///
+/// Currently: 18 characters
+pub fn format_timestamp_local(stamp: &Timestamp) -> String {
+    format_timestamp(stamp, "%y-%m-%d %a %H:%M")
+}
+
+/// Format nostr timestamp with seconds precision.
+pub fn format_timestamp_full(stamp: &Timestamp) -> String {
+    format_timestamp(stamp, "%y-%m-%d %a %H:%M:%S")
+}
+
+pub fn format_timestamp_relative_to(stamp: &Timestamp, reference: &Timestamp) -> String {
+    // Rough difference in days
+    match (stamp.as_u64() as i64 - reference.as_u64() as i64) / 80_000 {
+        0 => format_timestamp(stamp, "%H:%M"),
+        -3..=3 => format_timestamp(stamp, "%a %H:%M"),
+        _ => format_timestamp_local(stamp),
+    }
+}

src/kinds.rs

@@ -0,0 +1,177 @@
+use crate::task::MARKER_PARENT;
+use crate::tasks::NostrUsers;
+use crate::tasks::HIGH_PRIO;
+use itertools::Itertools;
+use nostr_sdk::{EventBuilder, EventId, Kind, PublicKey, Tag, TagKind, TagStandard};
+use std::borrow::Cow;
+
+pub const TASK_KIND: Kind = Kind::GitIssue;
+pub const PROCEDURE_KIND_ID: u16 = 1639;
+pub const PROCEDURE_KIND: Kind = Kind::Regular(PROCEDURE_KIND_ID);
+pub const TRACKING_KIND: Kind = Kind::Regular(1650);
+pub const BASIC_KINDS: [Kind; 4] = [
+    Kind::Metadata,
+    Kind::TextNote,
+    TASK_KIND,
+    Kind::Bookmarks,
+];
+pub const PROP_KINDS: [Kind; 6] = [
+    TRACKING_KIND,
+    Kind::GitStatusOpen,
+    Kind::GitStatusApplied,
+    Kind::GitStatusClosed,
+    Kind::GitStatusDraft,
+    PROCEDURE_KIND,
+];
+
+pub type Prio = u16;
+pub const PRIO: &str = "priority";
+
+// TODO: use formatting - bold / heading / italics - and generate from code
+/// Helper for available properties.
+pub const PROPERTY_COLUMNS: &str =
+    "# Available Properties
+Immutable:
+- `id` - unique task id
+- `parentid` - unique task id of the parent, if any
+- `name` - initial name of the task
+- `created` - task creation timestamp
+- `author` - name or abbreviated key of the task creator
+Task:
+- `status` - pure task status
+- `hashtags` - list of hashtags set for the task
+- `tags` - values of all nostr tags associated with the event, except event tags
+- `desc` - last note on the task
+- `description` - all notes on the task
+- `time` - time tracked on this task by you
+Utilities:
+- `state` - indicator of current progress
+- `owner` - author or task assignee
+- `rtime` - time tracked on this tasks and its subtree by everyone
+- `progress` - recursive subtask completion in percent
+- `subtasks` - how many direct subtasks are complete
+- `path` - name including parent tasks
+- `rpath` - name including parent tasks up to active task
+- TBI `depends` - list all tasks this task depends on before it becomes actionable
+Debugging: `kind`, `pubkey`, `props`, `alltags`, `descriptions`";
+
+pub struct EventTag {
+    pub id: EventId,
+    pub marker: Option<String>,
+}
+
+/// Return event tag if existing
+pub(crate) fn match_event_tag(tag: &Tag) -> Option<EventTag> {
+    let mut vec = tag.as_slice().into_iter();
+    if vec.next() == Some(&"e".to_string()) {
+        if let Some(id) = vec.next().and_then(|v| EventId::parse(v).ok()) {
+            vec.next();
+            return Some(EventTag { id, marker: vec.next().cloned() });
+        }
+    }
+    None
+}
+
+pub(crate) fn build_tracking<I>(id: I) -> EventBuilder
+where
+    I: IntoIterator<Item=EventId>,
+{
+    EventBuilder::new(Kind::from(TRACKING_KIND), "")
+        .tags(id.into_iter().map(Tag::event))
+}
+
+/// Formats and joins the tags with commata
+pub fn join_tags<'a, T>(tags: T) -> String
+where
+    T: IntoIterator<Item=&'a Tag>,
+{
+    tags.into_iter().map(format_tag).join(", ")
+}
+
+/// Return Hashtags embedded in the string.
+pub(crate) fn extract_hashtags(input: &str) -> impl Iterator<Item=Tag> + '_ {
+    input.split_ascii_whitespace()
+        .filter(|s| s.starts_with('#'))
+        .map(|s| s.trim_start_matches('#'))
+        .map(to_hashtag_tag)
+}
+
+/// Extracts everything after a " # " as a list of tags 
+/// as well as various embedded tags.
+///
+/// Expects sanitized input.
+pub(crate) fn extract_tags(input: &str, users: &NostrUsers) -> (String, Vec<Tag>) {
+    let words = input.split_ascii_whitespace();
+    let mut tags = Vec::with_capacity(4);
+    let result = words.filter(|s| {
+        if s.starts_with('@') {
+            if let Ok(key) = PublicKey::parse(&s[1..]) {
+                tags.push(Tag::public_key(key));
+                return false;
+            } else if let Some((key, _)) = users.find_user(&s[1..]) {
+                tags.push(Tag::public_key(*key));
+                return false;
+            }
+        } else if s.starts_with('*') {
+            if s.len() == 1 {
+                tags.push(to_prio_tag(HIGH_PRIO));
+                return false;
+            }
+            if let Ok(num) = s[1..].parse::<Prio>() {
+                tags.push(to_prio_tag(num * (if s.len() > 2 { 1 } else { 10 })));
+                return false;
+            }
+        }
+        true
+    }).collect_vec();
+    let mut split = result.split(|e| { e == &"#" });
+    let main = split.next().unwrap().join(" ");
+    let mut tags = extract_hashtags(&main)
+        .chain(split.flatten().map(|s| to_hashtag_tag(&s)))
+        .chain(tags)
+        .collect_vec();
+    tags.sort();
+    tags.dedup();
+    (main, tags)
+}
+
+pub fn to_hashtag_tag(tag: &str) -> Tag {
+    TagStandard::Hashtag(tag.to_string()).into()
+}
+
+pub fn format_tag(tag: &Tag) -> String {
+    if let Some(et) = match_event_tag(tag) {
+        return format!("{}: {:.8}",
+                       et.marker.as_ref().map(|m| m.to_string()).unwrap_or(MARKER_PARENT.to_string()),
+                       et.id);
+    }
+    format_tag_basic(tag)
+}
+
+pub fn format_tag_basic(tag: &Tag) -> String {
+    match tag.as_standardized() {
+        Some(TagStandard::PublicKey {
+                 public_key,
+                 alias,
+                 ..
+             }) => format!("Key{}: {:.8}", alias.as_ref().map(|s| format!(" {s}")).unwrap_or_default(), public_key),
+        Some(TagStandard::Hashtag(content)) =>
+            format!("#{content}"),
+        _ => tag.as_slice().join(" ")
+    }
+}
+
+pub fn to_prio_tag(value: Prio) -> Tag {
+    Tag::custom(TagKind::Custom(Cow::from(PRIO)), [value.to_string()])
+}
+
+#[test]
+fn test_extract_tags() {
+    assert_eq!(extract_tags("Hello from #mars with #greetings #yeah *4 # # yeah done-it", &Default::default()),
+               ("Hello from #mars with #greetings #yeah".to_string(),
+                std::iter::once(Tag::custom(TagKind::Custom(Cow::from(PRIO)), [40.to_string()]))
+                    .chain(["done-it", "greetings", "mars", "yeah"].into_iter().map(to_hashtag_tag))
+                    .collect()));
+    assert_eq!(extract_tags("So tagless @hewo #", &Default::default()),
+               ("So tagless @hewo".to_string(), vec![]));
+}

src/task.rs

@@ -1,170 +1,264 @@
-use fmt::Display;
-use std::collections::{BTreeSet, HashSet};
-use std::fmt;
-use std::ops::Div;
+mod state;
+#[cfg(test)]
+mod tests;
 
+use fmt::Display;
+use std::cmp::Ordering;
+use std::collections::btree_set::Iter;
+use std::collections::BTreeSet;
+use std::fmt;
+use std::hash::{Hash, Hasher};
+use std::iter::{once, Chain, Once};
+use std::str::FromStr;
+use std::string::ToString;
+
+use crate::hashtag::{is_hashtag, Hashtag};
+use crate::helpers::{format_timestamp_local, some_non_empty};
+use crate::kinds::{match_event_tag, Prio, PRIO, PROCEDURE_KIND, PROCEDURE_KIND_ID, TASK_KIND};
+use crate::tasks::now;
+
+pub use crate::task::state::State;
+pub use crate::task::state::StateChange;
+
+use colored::{ColoredString, Colorize};
 use itertools::Either::{Left, Right};
 use itertools::Itertools;
 use log::{debug, error, info, trace, warn};
-use nostr_sdk::{Alphabet, Event, EventBuilder, EventId, Kind, Tag, Timestamp};
+use nostr_sdk::{Alphabet, Event, EventId, Kind, PublicKey, SingleLetterTag, Tag, TagKind, Timestamp};
 
-use crate::EventSender;
+pub static MARKER_PARENT: &str = "parent";
+pub static MARKER_DEPENDS: &str = "depends";
+pub static MARKER_PROPERTY: &str = "property";
 
-#[derive(Debug, Clone, PartialEq)]
+#[derive(Debug, Clone, PartialEq, Eq)]
 pub(crate) struct Task {
-    pub(crate) event: Event,
-    pub(crate) children: HashSet<EventId>,
+    /// Event that defines this task
+    pub(super) event: Event, // TODO make private
+    /// Cached sorted tags of the event with references removed
+    tags: Option<BTreeSet<Tag>>,
+    /// Task references derived from the event tags
+    refs: Vec<(String, EventId)>,
+    /// Events belonging to this task, such as state updates and notes
     pub(crate) props: BTreeSet<Event>,
-    /// Cached sorted tags of the event
-    pub(crate) tags: Option<BTreeSet<Tag>>,
-    parents: Vec<EventId>,
+}
+
+impl PartialOrd<Self> for Task {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        self.event.partial_cmp(&other.event)
+    }
+}
+
+impl Ord for Task {
+    fn cmp(&self, other: &Self) -> Ordering {
+        self.event.cmp(&other.event)
+    }
+}
+
+impl Hash for Task {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        self.event.id.hash(state);
+    }
 }
 
 impl Task {
     pub(crate) fn new(event: Event) -> Task {
-        let (parents, tags) = event.tags.iter().partition_map(|tag| match tag {
-            Tag::Event { event_id, .. } => return Left(event_id),
-            _ => Right(tag.clone()),
+        let (refs, tags) = event.tags.iter().partition_map(|tag| if let Some(et) = match_event_tag(tag) {
+            Left((et.marker.as_ref().map_or(MARKER_PARENT.to_string(), |m| m.to_string()), et.id))
+        } else {
+            Right(tag.clone())
         });
+        // Separate refs for dependencies
         Task {
-            children: Default::default(),
             props: Default::default(),
             tags: Some(tags).filter(|t: &BTreeSet<Tag>| !t.is_empty()),
-            parents,
+            refs,
             event,
         }
     }
 
-    pub(crate) fn get_id(&self) -> &EventId {
-        &self.event.id
+    /// All Events including the task and its props in chronological order
+    pub(crate) fn all_events(&self) -> impl DoubleEndedIterator<Item=&Event> {
+        once(&self.event).chain(self.props.iter().rev())
     }
 
-    pub(crate) fn parent_id(&self) -> Option<EventId> {
-        self.parents.first().cloned()
+    pub(crate) fn get_id(&self) -> EventId {
+        self.event.id
     }
 
+    pub(crate) fn get_participants(&self) -> impl Iterator<Item=PublicKey> + '_ {
+        self.tags()
+            .filter(|t| t.kind() == TagKind::SingleLetter(SingleLetterTag::lowercase(Alphabet::P)))
+            .filter_map(|t| t.content()
+                .and_then(|c| PublicKey::from_str(c).inspect_err(|e| warn!("Unparseable pubkey in {:?}", t)).ok()))
+    }
+
+    pub(crate) fn get_owner(&self) -> PublicKey {
+        self.get_participants().next()
+            .unwrap_or_else(|| self.event.pubkey)
+    }
+
+    /// Trimmed event content or stringified id
     pub(crate) fn get_title(&self) -> String {
-        Some(self.event.content.trim().to_string())
-            .filter(|s| !s.is_empty())
+        some_non_empty(self.event.content.trim())
             .unwrap_or_else(|| self.get_id().to_string())
     }
 
-    pub(crate) fn descriptions(&self) -> impl Iterator<Item = &String> + '_ {
+    /// Title with leading hashtags removed
+    pub(crate) fn get_filter_title(&self) -> String {
+        self.event.content.trim().trim_start_matches('#').to_string()
+    }
+
+    pub(crate) fn find_refs<'a>(&'a self, marker: &'a str) -> impl Iterator<Item=&'a EventId> {
+        self.refs.iter().filter_map(move |(str, id)|
+            Some(id).filter(|_| str == marker))
+    }
+
+    pub(crate) fn parent_id(&self) -> Option<&EventId> {
+        self.find_refs(MARKER_PARENT).next()
+    }
+
+    pub(crate) fn find_dependents(&self) -> Vec<&EventId> {
+        self.find_refs(MARKER_DEPENDS).collect()
+    }
+
+    fn description_events(&self) -> impl DoubleEndedIterator<Item=&Event> + '_ {
+        self.props.iter().filter(|event| event.kind == Kind::TextNote)
+    }
+
+    /// Description items, ordered newest to oldest
+    pub(crate) fn descriptions(&self) -> impl DoubleEndedIterator<Item=&String> + '_ {
+        self.description_events()
+            .filter_map(|e| Some(&e.content).take_if(|s| !s.trim().is_empty()))
+    }
+
+    pub(crate) fn is_task_kind(&self) -> bool {
+        self.event.kind == TASK_KIND
+    }
+
+    /// Whether this is an actionable task - false if stateless activity
+    pub(crate) fn is_task(&self) -> bool {
+        self.is_task_kind() ||
+            self.props.iter().any(|event| State::try_from(event.kind).is_ok())
+    }
+
+    pub(crate) fn priority(&self) -> Option<Prio> {
+        self.priority_raw().and_then(|s| s.parse().ok())
+    }
+
+    pub(crate) fn priority_raw(&self) -> Option<&str> {
+        self.props.iter()
+            .chain(once(&self.event))
+            .find_map(|p| {
+                p.tags.iter().find_map(|t|
+                    t.content().take_if(|_| { t.kind().to_string() == PRIO }))
+            })
+    }
+
+    fn states(&self) -> impl DoubleEndedIterator<Item=StateChange> + '_ {
         self.props.iter().filter_map(|event| {
-            if event.kind == Kind::TextNote {
-                Some(&event.content)
+            event.kind.try_into().ok().map(|s| StateChange {
+                name: some_non_empty(&event.content),
+                state: s,
+                time: event.created_at,
+            })
+        })
+    }
+
+    pub fn last_state_update(&self) -> Timestamp {
+        self.state().map(|s| s.time).unwrap_or(self.event.created_at)
+    }
+
+    pub fn state_at(&self, time: Timestamp) -> Option<StateChange> {
+        // TODO do not iterate constructed state objects
+        let state = self.states().take_while_inclusive(|ts| ts.time > time);
+        state.last().map(|ts| {
+            if ts.time <= time {
+                ts
             } else {
-                None
+                self.default_state()
             }
         })
     }
 
-    fn states(&self) -> impl Iterator<Item = TaskState> + '_ {
-        self.props.iter().filter_map(|event| {
-            event.kind.try_into().ok().map(|s| TaskState {
-                name: Some(event.content.clone()).filter(|c| !c.is_empty()),
-                state: s,
-                time: event.created_at.clone(),
-            })
-        })
-    }
-
-    pub(crate) fn state(&self) -> Option<TaskState> {
-        self.states().max_by_key(|t| t.time)
+    /// Returns the current state if this is a task rather than an activity
+    pub fn state(&self) -> Option<StateChange> {
+        let now = now();
+        self.state_at(now)
     }
 
     pub(crate) fn pure_state(&self) -> State {
-        self.state().map_or(State::Open, |s| s.state)
+        State::from(self.state())
     }
 
-    pub(crate) fn set_state(
-        &mut self,
-        sender: &EventSender,
-        state: State,
-        comment: &str,
-    ) -> Option<Event> {
-        sender
-            .submit(EventBuilder::new(
-                state.kind(),
-                comment,
-                vec![Tag::event(self.event.id)],
-            ))
-            .inspect(|e| {
-                self.props.insert(e.clone());
-            })
+    pub(crate) fn state_or_default(&self) -> StateChange {
+        self.state().unwrap_or_else(|| self.default_state())
     }
 
-    fn default_state(&self) -> TaskState {
-        TaskState {
+    /// Returns None for activities.
+    pub(crate) fn state_label(&self) -> Option<ColoredString> {
+        self.state()
+            .or_else(|| Some(self.default_state()).filter(|_| self.is_task()))
+            .map(|state| state.get_colored_label())
+    }
+
+    fn default_state(&self) -> StateChange {
+        StateChange {
             name: None,
             state: State::Open,
             time: self.event.created_at,
         }
     }
 
-    /// Total time this task has been active.
-    /// TODO: Consider caching
-    pub(crate) fn time_tracked(&self) -> u64 {
-        let mut total = 0;
-        let mut start: Option<Timestamp> = None;
-        for state in self.states() {
-            match state.state {
-                State::Active => start = start.or(Some(state.time)),
-                _ => {
-                    if let Some(stamp) = start {
-                        total += (state.time - stamp).as_u64();
-                        start = None;
-                    }
-                }
-            }
-        }
-        if let Some(start) = start {
-            total += (Timestamp::now() - start).as_u64();
-        }
-        total
+    pub(crate) fn list_hashtags(&self) -> impl Iterator<Item=Hashtag> + '_ {
+        self.tags().filter_map(|t| Hashtag::try_from(t).ok())
     }
 
-    fn filter_tags<P>(&self, predicate: P) -> Option<String>
+    /// Tags of this task that are not event references, newest to oldest
+    fn tags(&self) -> impl Iterator<Item=&Tag> {
+        self.props.iter()
+            .flat_map(|e| e.tags.iter()
+                .filter(|t| t.single_letter_tag().is_none_or(|s| s.character != Alphabet::E)))
+            .chain(self.tags.iter().flatten())
+    }
+
+    fn join_tags<P>(&self, predicate: P) -> String
     where
         P: FnMut(&&Tag) -> bool,
     {
-        self.tags.as_ref().map(|tags| {
-            tags.into_iter()
-                .filter(predicate)
-                .map(|t| format!("{}", t.content().unwrap()))
-                .collect::<Vec<String>>()
-                .join(" ")
-        })
+        self.tags()
+            .filter(predicate)
+            .map(|t| t.content().unwrap().to_string())
+            .sorted_unstable()
+            .dedup()
+            .join(" ")
     }
 
     pub(crate) fn get(&self, property: &str) -> Option<String> {
         match property {
-            "id" => Some(self.event.id.to_string()),
+            // Static
+            "id" => Some(self.get_id().to_string()),
             "parentid" => self.parent_id().map(|i| i.to_string()),
-            "state" => self.state().map(|s| s.to_string()),
             "name" => Some(self.event.content.clone()),
-            "time" => Some(self.time_tracked().div(60))
-                .filter(|t| t > &0)
-                .map(|t| format!("{}m", t)),
-            "desc" => self.descriptions().last().cloned(),
-            "description" => Some(self.descriptions().join(" ")),
-            "hashtags" => self.filter_tags(|tag| {
-                tag.single_letter_tag()
-                    .is_some_and(|sltag| sltag.character == Alphabet::T)
-            }),
-            "tags" => self.filter_tags(|_| true),
+            "key" | "pubkey" => Some(self.event.pubkey.to_string()),
+            "created" => Some(format_timestamp_local(&self.event.created_at)),
+            "kind" => Some(self.event.kind.to_string()),
+            // Dynamic
+            "priority" => self.priority_raw().map(|c| c.to_string()),
+            "status" => self.state_label().map(|c| c.to_string()),
+            "desc" => self.descriptions().next().cloned(),
+            "description" => Some(self.descriptions().rev().join(" ")),
+            "hashtags" => Some(self.join_tags(|tag| { is_hashtag(tag) })),
+            "tags" => Some(self.join_tags(|_| true)), // TODO test these!
             "alltags" => Some(format!("{:?}", self.tags)),
+            "refs" => Some(format!("{:?}", self.refs.iter().map(|re| format!("{}: {}", re.0, re.1)).collect_vec())),
             "props" => Some(format!(
                 "{:?}",
                 self.props
                     .iter()
-                    .map(|e| format!("{} kind {} '{}'", e.created_at, e.kind, e.content))
-                    .collect::<Vec<String>>()
-            )),
-            "descriptions" => Some(format!(
-                "{:?}",
-                self.descriptions().collect::<Vec<&String>>()
+                    .map(|e| format!("{} kind {} \"{}\"", e.created_at, e.kind, e.content))
+                    .collect_vec()
             )),
+            "descriptions" => Some(format!("{:?}", self.descriptions().collect_vec())),
             _ => {
                 warn!("Unknown task property {}", property);
                 None
@@ -172,79 +266,3 @@ impl Task {
         }
     }
 }
-
-pub(crate) struct TaskState {
-    state: State,
-    name: Option<String>,
-    pub(crate) time: Timestamp,
-}
-impl TaskState {
-    pub(crate) fn get_label(&self) -> String {
-        self.name.clone().unwrap_or_else(|| self.state.to_string())
-    }
-    pub(crate) fn matches_label(&self, label: &str) -> bool {
-        self.state == State::Active
-            || self
-                .name
-                .as_ref()
-                .is_some_and(|n| n.eq_ignore_ascii_case(label))
-            || self.state.to_string().eq_ignore_ascii_case(label)
-    }
-}
-impl Display for TaskState {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        let state_str = self.state.to_string();
-        write!(
-            f,
-            "{}",
-            self.name
-                .as_ref()
-                .map(|s| s.trim())
-                .filter(|s| !s.eq_ignore_ascii_case(&state_str))
-                .map_or(state_str, |s| format!("{}: {}", self.state, s))
-        )
-    }
-}
-
-#[derive(Debug, Copy, Clone, PartialEq)]
-pub(crate) enum State {
-    Closed,
-    Open,
-    Active,
-    Done,
-}
-impl TryFrom<Kind> for State {
-    type Error = ();
-
-    fn try_from(value: Kind) -> Result<Self, Self::Error> {
-        match value.as_u32() {
-            1630 => Ok(State::Open),
-            1631 => Ok(State::Done),
-            1632 => Ok(State::Closed),
-            1633 => Ok(State::Active),
-            _ => Err(()),
-        }
-    }
-}
-impl State {
-    pub(crate) fn is_open(&self) -> bool {
-        match self {
-            State::Open | State::Active => true,
-            _ => false,
-        }
-    }
-
-    pub(crate) fn kind(&self) -> Kind {
-        match self {
-            State::Open => Kind::from(1630),
-            State::Done => Kind::from(1631),
-            State::Closed => Kind::from(1632),
-            State::Active => Kind::from(1633),
-        }
-    }
-}
-impl Display for State {
-    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        fmt::Debug::fmt(self, f)
-    }
-}

src/task/state.rs

@@ -0,0 +1,128 @@
+use crate::helpers::some_non_empty;
+use crate::kinds::{PROCEDURE_KIND, PROCEDURE_KIND_ID};
+
+use colored::{ColoredString, Colorize};
+use nostr_sdk::{Kind, Timestamp};
+use std::fmt;
+use std::fmt::Display;
+
+#[derive(Debug, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+pub struct StateChange {
+    pub(super) state: State,
+    pub(super) name: Option<String>,
+    pub(super) time: Timestamp,
+}
+impl StateChange {
+    pub fn get_label_for(state: &State, comment: &str) -> String {
+        some_non_empty(comment).unwrap_or_else(|| state.to_string())
+    }
+    pub fn get_label(&self) -> String {
+        self.name.clone().unwrap_or_else(|| self.state.to_string())
+    }
+    pub fn get_colored_label(&self) -> ColoredString {
+        self.state.colorize(&self.get_label())
+    }
+    pub fn matches_label(&self, label: &str) -> bool {
+        self.name.as_ref().is_some_and(|n| n.eq_ignore_ascii_case(label))
+            || self.state.to_string().eq_ignore_ascii_case(label)
+    }
+    pub fn get_timestamp(&self) -> Timestamp {
+        self.time
+    }
+}
+impl Display for StateChange {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let state_str = self.state.to_string();
+        write!(
+            f,
+            "{}",
+            self.name
+                .as_ref()
+                .map(|s| s.trim())
+                .filter(|s| !s.eq_ignore_ascii_case(&state_str))
+                .map_or(state_str, |s| format!("{}: {}", self.state, s))
+        )
+    }
+}
+impl From<Option<StateChange>> for State {
+    fn from(value: Option<StateChange>) -> Self {
+        value.map_or(State::Open, |s| s.state)
+    }
+}
+
+
+#[derive(Debug, Copy, Clone, Eq, PartialEq, Ord, PartialOrd, Hash)]
+pub enum State {
+    /// Actionable
+    Open = 1630,
+    /// Completed
+    Done,
+    /// Not Actionable (anymore)
+    Closed,
+    /// Temporarily not actionable
+    Pending,
+    /// Ordered task list
+    Procedure = PROCEDURE_KIND_ID as isize,
+}
+impl TryFrom<&str> for State {
+    type Error = ();
+
+    fn try_from(value: &str) -> Result<Self, Self::Error> {
+        match value.to_ascii_lowercase().as_str() {
+            "closed" => Ok(State::Closed),
+            "done" => Ok(State::Done),
+            "pending" => Ok(State::Pending),
+            "proc" | "procedure" | "list" => Ok(State::Procedure),
+            "open" => Ok(State::Open),
+            _ => Err(()),
+        }
+    }
+}
+impl TryFrom<Kind> for State {
+    type Error = ();
+
+    fn try_from(value: Kind) -> Result<Self, Self::Error> {
+        match value {
+            Kind::GitStatusOpen => Ok(State::Open),
+            Kind::GitStatusApplied => Ok(State::Done),
+            Kind::GitStatusClosed => Ok(State::Closed),
+            Kind::GitStatusDraft => Ok(State::Pending),
+            _ => {
+                if value == PROCEDURE_KIND {
+                    Ok(State::Procedure)
+                } else {
+                    Err(())
+                }
+            }
+        }
+    }
+}
+impl State {
+    pub(crate) fn is_open(&self) -> bool {
+        matches!(self, State::Open | State::Pending | State::Procedure)
+    }
+
+    pub(crate) fn kind(self) -> u16 {
+        self as u16
+    }
+
+    pub(crate) fn colorize(&self, str: &str) -> ColoredString {
+        match self {
+            State::Open => str.green(),
+            State::Done => str.bright_black(),
+            State::Closed => str.magenta(),
+            State::Pending => str.yellow(),
+            State::Procedure => str.blue(),
+        }
+    }
+}
+impl From<State> for Kind {
+    fn from(value: State) -> Self {
+        Kind::from(value.kind())
+    }
+}
+impl Display for State {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        fmt::Debug::fmt(self, f)
+    }
+}

src/task/tests.rs

@@ -0,0 +1,40 @@
+use super::*;
+use nostr_sdk::{EventBuilder, Keys, Tag, Timestamp};
+
+#[test]
+fn test_state() {
+    let keys = Keys::generate();
+    let mut task = Task::new(
+        EventBuilder::new(Kind::GitIssue, "task").tags([Tag::hashtag("tag1")])
+            .sign_with_keys(&keys).unwrap());
+    assert_eq!(task.pure_state(), State::Open);
+    assert_eq!(task.list_hashtags().count(), 1);
+
+    let now = Timestamp::now();
+    task.props.insert(
+        EventBuilder::new(State::Done.into(), "")
+            .custom_created_at(now)
+            .sign_with_keys(&keys).unwrap());
+    assert_eq!(task.pure_state(), State::Done);
+    task.props.insert(
+        EventBuilder::new(State::Open.into(), "Ready").tags([Tag::hashtag("tag2")])
+            .custom_created_at(now - 2)
+            .sign_with_keys(&keys).unwrap());
+    assert_eq!(task.pure_state(), State::Done);
+    assert_eq!(task.list_hashtags().count(), 2);
+    task.props.insert(
+        EventBuilder::new(State::Closed.into(), "")
+            .custom_created_at(now + 9)
+            .sign_with_keys(&keys).unwrap());
+    assert_eq!(task.pure_state(), State::Closed);
+    assert_eq!(task.state_at(now), Some(StateChange {
+        state: State::Done,
+        name: None,
+        time: now,
+    }));
+    assert_eq!(task.state_at(now - 1), Some(StateChange {
+        state: State::Open,
+        name: Some("Ready".to_string()),
+        time: now - 2,
+    }));
+}

src/tasks/children_traversal.rs

@@ -0,0 +1,160 @@
+use std::iter::FusedIterator;
+use itertools::Itertools;
+use nostr_sdk::EventId;
+use crate::task::Task;
+use crate::tasks::{TaskMap, TaskMapMethods, TasksRelay};
+
+#[derive(Clone, Debug, PartialEq)]
+enum TraversalFilter {
+    Reject = 0b00,
+    TakeSelf = 0b01,
+    TakeChildren = 0b10,
+    Take = 0b11,
+}
+impl TraversalFilter {
+    fn takes_children(&self) -> bool {
+        self == &TraversalFilter::Take ||
+            self == &TraversalFilter::TakeChildren
+    }
+    fn takes_self(&self) -> bool {
+        self == &TraversalFilter::Take ||
+            self == &TraversalFilter::TakeSelf
+    }
+}
+
+/// Breadth-First Iterator over tasks with recursive children
+pub(super) struct ChildrenTraversal<'a> {
+    tasks: &'a TaskMap,
+    /// Found Events
+    queue: Vec<EventId>,
+    /// Index of the next element in the queue
+    index: usize,
+    /// Depth of the next element
+    depth: usize,
+    /// Element with the next depth boundary
+    next_depth_at: usize,
+}
+impl<'a> ChildrenTraversal<'a> {
+    fn rooted(tasks: &'a TaskMap, id: Option<&EventId>) -> Self {
+        let mut queue = Vec::with_capacity(tasks.len());
+        queue.append(
+            &mut tasks
+                .values()
+                .filter(move |t| t.parent_id() == id)
+                .map(|t| t.get_id())
+                .collect_vec()
+        );
+        Self::with_queue(tasks, queue)
+    }
+
+    fn with_queue(tasks: &'a TaskMap, queue: Vec<EventId>) -> Self {
+        ChildrenTraversal {
+            tasks: &tasks,
+            next_depth_at: queue.len(),
+            index: 0,
+            depth: 1,
+            queue,
+        }
+    }
+
+    pub(super) fn from(tasks: &'a TasksRelay, id: EventId) -> Self {
+        let mut queue = Vec::with_capacity(64);
+        queue.push(id);
+        ChildrenTraversal {
+            tasks: &tasks.tasks,
+            queue,
+            index: 0,
+            depth: 0,
+            next_depth_at: 1,
+        }
+    }
+
+    /// Process until the given depth
+    /// Returns true if that depth was reached
+    pub(super) fn process_depth(&mut self, depth: usize) -> bool {
+        while self.depth < depth {
+            if self.next().is_none() {
+                return false;
+            }
+        }
+        true
+    }
+
+    /// Get all children
+    pub(super) fn get_all(mut self) -> Vec<EventId> {
+        while self.next().is_some() {}
+        self.queue
+    }
+
+    /// Get all tasks until the specified depth
+    pub(super) fn get_depth(mut self, depth: usize) -> Vec<EventId> {
+        self.process_depth(depth);
+        self.queue
+    }
+
+    fn check_depth(&mut self) {
+        if self.next_depth_at == self.index {
+            self.depth += 1;
+            self.next_depth_at = self.queue.len();
+        }
+    }
+
+    /// Get next id and advance, without adding children
+    fn next_task(&mut self) -> Option<EventId> {
+        if self.index >= self.queue.len() {
+            return None;
+        }
+        let id = self.queue[self.index];
+        self.index += 1;
+        Some(id)
+    }
+
+    /// Get the next known task and run it through the filter
+    fn next_filtered<F>(&mut self, filter: &F) -> Option<&'a Task>
+    where
+        F: Fn(&Task) -> TraversalFilter,
+    {
+        self.next_task().and_then(|id| {
+            if let Some(task) = self.tasks.get(&id) {
+                let take = filter(task);
+                if take.takes_children() {
+                    self.queue_children_of(&task);
+                }
+                if take.takes_self() {
+                    self.check_depth();
+                    return Some(task);
+                }
+            }
+            self.check_depth();
+            self.next_filtered(filter)
+        })
+    }
+
+    fn queue_children_of(&mut self, task: &'a Task) {
+        self.queue.extend(self.tasks.children_ids_for(task.get_id()));
+    }
+}
+impl FusedIterator for ChildrenTraversal<'_> {}
+impl<'a> Iterator for ChildrenTraversal<'a> {
+    type Item = EventId;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.next_task().inspect(|id| {
+            match self.tasks.get(id) {
+                None => {
+                    // Unknown task, might still find children, just slower
+                    for task in self.tasks.values() {
+                        if task.parent_id().is_some_and(|i| i == id) {
+                            self.queue.push(task.get_id());
+                        }
+                    }
+                }
+                Some(task) => {
+                    self.queue_children_of(&task);
+                }
+            }
+            self.check_depth();
+        })
+    }
+}
+

src/tasks/durations.rs

@@ -0,0 +1,83 @@
+use std::time::Duration;
+use itertools::Itertools;
+use nostr_sdk::{Event, EventId, Timestamp};
+use crate::kinds::match_event_tag;
+
+pub(super) fn referenced_events(event: &Event) -> impl Iterator<Item=EventId> + '_ {
+    event.tags.iter().filter_map(|tag| match_event_tag(tag).map(|t| t.id))
+}
+
+/// Returns the id of a referenced event if it is contained in the provided ids list.
+fn matching_tag_id<'a>(event: &'a Event, ids: &'a [EventId]) -> Option<EventId> {
+    referenced_events(event).find(|id| ids.contains(id))
+}
+
+/// Filters out event timestamps to those that start or stop one of the given events
+pub(super) fn timestamps<'a>(
+    events: impl Iterator<Item=&'a Event>,
+    ids: &'a [EventId],
+) -> impl Iterator<Item=(&Timestamp, Option<EventId>)> {
+    events
+        .map(|event| (&event.created_at, matching_tag_id(event, ids)))
+        .dedup_by(|(_, e1), (_, e2)| e1 == e2)
+        .skip_while(|element| element.1.is_none())
+}
+
+/// Iterates Events to accumulate times tracked
+/// Expects a sorted iterator
+pub(super) struct Durations<'a> {
+    events: Box<dyn Iterator<Item=&'a Event> + 'a>,
+    ids: &'a [EventId],
+    threshold: Option<Timestamp>,
+}
+impl Durations<'_> {
+    pub(super) fn from<'b>(
+        events: impl IntoIterator<Item=&'b Event> + 'b,
+        ids: &'b [EventId],
+    ) -> Durations<'b> {
+        Durations {
+            events: Box::new(events.into_iter()),
+            ids,
+            threshold: Some(Timestamp::now()), // TODO consider offset?
+        }
+    }
+}
+impl Iterator for Durations<'_> {
+    type Item = Duration;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        let mut start: Option<u64> = None;
+        while let Some(event) = self.events.next() {
+            if matching_tag_id(event, self.ids).is_some() {
+                if self.threshold.is_some_and(|th| event.created_at > th) {
+                    continue;
+                }
+                start = start.or(Some(event.created_at.as_u64()))
+            } else {
+                if let Some(stamp) = start {
+                    return Some(Duration::from_secs(event.created_at.as_u64() - stamp));
+                }
+            }
+        }
+        let now = self.threshold.unwrap_or(Timestamp::now()).as_u64();
+        start.filter(|t| t < &now)
+            .map(|stamp| Duration::from_secs(now.saturating_sub(stamp)))
+    }
+}
+
+#[test]
+#[ignore]
+fn test_timestamps() {
+    let mut tasks = crate::tasks::tests::stub_tasks();
+    let zero = EventId::all_zeros();
+
+    tasks.track_at(Timestamp::now() + 100, Some(zero));
+    assert_eq!(
+        timestamps(tasks.get_own_events_history(), &[zero])
+            .collect_vec()
+            .len(),
+        2
+    )
+    // TODO Does not show both future and current tracking properly, need to split by current time
+}
+

src/tasks/nostr_users.rs

@@ -0,0 +1,63 @@
+use nostr_sdk::{Keys, Metadata, PublicKey, Tag};
+use std::collections::HashMap;
+use std::str::FromStr;
+
+#[derive(Default, Debug, Clone, PartialEq, Eq)]
+pub struct NostrUsers {
+    users: HashMap<PublicKey, Metadata>,
+}
+
+impl NostrUsers {
+    pub(crate) fn find_user_with_displayname(&self, term: &str) -> Option<(PublicKey, String)> {
+        self.find_user(term)
+            .map(|(k, _)| (*k, self.get_displayname(k)))
+    }
+
+    // Find username or key starting with the given term.
+    pub(crate) fn find_user(&self, term: &str) -> Option<(&PublicKey, &Metadata)> {
+        let lowered = term.trim().to_ascii_lowercase();
+        let term = lowered.as_str();
+        if term.is_empty() {
+            return None;
+        }
+        if let Ok(key) = PublicKey::from_str(term) {
+            return self.users.get_key_value(&key);
+        }
+        self.users.iter().find(|(k, v)|
+            // TODO regex word boundary
+            v.name.as_ref().is_some_and(|n| n.to_ascii_lowercase().starts_with(term)) ||
+                v.display_name.as_ref().is_some_and(|n| n.to_ascii_lowercase().starts_with(term)) ||
+                (term.len() > 4 && k.to_string().starts_with(term)))
+    }
+
+    pub(crate) fn get_displayname(&self, pubkey: &PublicKey) -> String {
+        self.users.get(pubkey)
+            .and_then(|m| m.display_name.clone().or(m.name.clone()))
+            .unwrap_or_else(|| pubkey.to_string())
+    }
+
+    pub(crate) fn get_username(&self, pubkey: &PublicKey) -> String {
+        self.users.get(pubkey)
+            .and_then(|m| m.name.clone())
+            .unwrap_or_else(|| format!("{:.6}", pubkey.to_string()))
+    }
+
+    pub(super) fn insert(&mut self, pubkey: PublicKey, metadata: Metadata) {
+        self.users.insert(pubkey, metadata);
+    }
+
+    pub(super) fn create(&mut self, pubkey: PublicKey) {
+        if !self.users.contains_key(&pubkey) {
+            self.users.insert(pubkey, Default::default());
+        }
+    }
+}
+
+#[test]
+fn test_user_extract() {
+    let keys = Keys::generate();
+    let mut users = NostrUsers::default();
+    users.insert(keys.public_key, Metadata::new().display_name("Tester Jo"));
+    assert_eq!(crate::kinds::extract_tags("Hello @test", &users),
+               ("Hello".to_string(), vec![Tag::public_key(keys.public_key)]));
+}

src/tasks/tests.rs

@@ -0,0 +1,466 @@
+use super::*;
+use crate::event_sender::EventSender;
+use crate::hashtag::Hashtag;
+use crate::kinds::{extract_tags, to_hashtag_tag, TASK_KIND};
+use crate::task::{State, Task, MARKER_DEPENDS, MARKER_PARENT};
+use itertools::Itertools;
+use nostr_sdk::{EventBuilder, EventId, Keys, Kind, Tag, Timestamp};
+use std::collections::HashSet;
+
+pub(super) fn stub_tasks() -> TasksRelay {
+    use nostr_sdk::Keys;
+    use tokio::sync::mpsc;
+
+    let (tx, _rx) = mpsc::channel(16);
+    TasksRelay::with_sender(EventSender {
+        url: None,
+        tx,
+        keys: Keys::generate(),
+        queue: Default::default(),
+    })
+}
+
+macro_rules! assert_position {
+        ($tasks:expr, $id:expr $(,)?) => {
+            let pos = $tasks.get_position();
+            assert_eq!(pos, Some($id),
+                "Current: {:?}\nExpected: {:?}",
+                $tasks.get_task_path(pos),
+                $tasks.get_task_path(Some($id)),
+            )
+        };
+    }
+
+macro_rules! assert_tasks_visible {
+        ($tasks:expr, $expected:expr $(,)?) => {
+            assert_tasks!($tasks, $tasks.visible_tasks(), $expected,
+                "\nQuick Access: {:?}",
+                $tasks.quick_access_raw().map(|id| $tasks.get_task_path(Some(id))).collect_vec());
+        };
+    }
+
+macro_rules! assert_tasks_view {
+        ($tasks:expr, $expected:expr $(,)?) => {
+            assert_tasks!($tasks, $tasks.viewed_tasks(), $expected, "");
+        };
+    }
+
+macro_rules! assert_tasks {
+        ($tasks:expr, $tasklist:expr, $expected:expr $(, $($arg:tt)*)?) => {
+            assert_eq!(
+                $tasklist
+                    .iter()
+                    .map(|t| t.get_id())
+                    .collect::<HashSet<EventId>>(),
+                HashSet::from_iter($expected.clone()),
+                "Tasks Visible: {:?}\nExpected: {:?}{}",
+                $tasklist.iter().map(|t| t.get_id()).map(|id| $tasks.get_task_path(Some(id))).collect_vec(),
+                $expected.into_iter().map(|id| $tasks.get_task_path(Some(id))).collect_vec(),
+                format!($($($arg)*)?)
+            );
+        };
+    }
+
+#[test]
+fn test_recursive_closing() {
+    let mut tasks = stub_tasks();
+
+    tasks.custom_time = Some(Timestamp::zero());
+    let parent = tasks.make_task_unwrapped("parent #tag1");
+    tasks.move_to(Some(parent));
+    let sub = tasks.make_task_unwrapped("sub #oi # tag2");
+    assert_eq!(
+        tasks.all_hashtags(),
+        ["oi", "tag1", "tag2"].into_iter().map(Hashtag::from).collect()
+    );
+    tasks.make_note("note with #tag3 # yeah");
+    let all_tags = ["oi", "tag1", "tag2", "tag3", "yeah"].into_iter().map(Hashtag::from).collect();
+    assert_eq!(tasks.all_hashtags(), all_tags);
+
+    tasks.custom_time = Some(Timestamp::now());
+    tasks.update_state("Finished #YeaH # oi", State::Done);
+    assert_eq!(
+        tasks.get_by_id(&parent).unwrap().list_hashtags().collect_vec(),
+        ["YeaH", "oi", "tag3", "yeah", "tag1"].map(Hashtag::from)
+    );
+    assert_eq!(tasks.all_hashtags(), all_tags);
+
+    tasks.custom_time = Some(now());
+    tasks.update_state("Closing Down", State::Closed);
+    assert_eq!(tasks.get_by_id(&sub).unwrap().pure_state(), State::Closed);
+    assert_eq!(tasks.get_by_id(&parent).unwrap().pure_state(), State::Closed);
+    assert_eq!(tasks.nonclosed_tasks().next(), None);
+    assert_eq!(tasks.all_hashtags(), Default::default());
+}
+
+#[test]
+fn test_context() {
+    let mut tasks = stub_tasks();
+    tasks.update_tags(["dp", "yeah"].into_iter().map(Hashtag::from));
+    assert_eq!(tasks.get_prompt_suffix(), " #dp #yeah");
+    tasks.remove_tag("Y");
+    assert_eq!(tasks.tags, ["dp"].into_iter().map(Hashtag::from).collect());
+
+    tasks.set_priority(Some(HIGH_PRIO));
+    assert_eq!(tasks.get_prompt_suffix(), " #dp *85");
+    let id_hp = tasks.make_task_unwrapped("high prio tagged # tag");
+    let hp = tasks.get_by_id(&id_hp).unwrap();
+    assert_eq!(hp.priority(), Some(HIGH_PRIO));
+    assert_eq!(
+        hp.list_hashtags().collect_vec(),
+        vec!["DP", "tag"].into_iter().map(Hashtag::from).collect_vec()
+    );
+
+    tasks.state = StateFilter::from("WIP");
+    tasks.set_priority(Some(QUICK_PRIO));
+
+    tasks.make_task_and_enter("another *4", State::Pending);
+    let task2 = tasks.get_current_task().unwrap();
+    assert_eq!(task2.priority(), Some(40));
+    assert_eq!(task2.pure_state(), State::Pending);
+    assert_eq!(task2.state().unwrap().get_label(), "Pending");
+    tasks.make_note("*3");
+    let task2 = tasks.get_current_task().unwrap();
+    assert_eq!(task2.descriptions().next(), None);
+    assert_eq!(task2.priority(), Some(30));
+    let anid = task2.get_id();
+
+    tasks.custom_time = Some(Timestamp::now() + 1);
+    let s1 = tasks.make_task_unwrapped("sub1");
+    tasks.custom_time = Some(Timestamp::now() + 2);
+    tasks.set_priority(Some(QUICK_PRIO + 1));
+    let s2 = tasks.make_task_unwrapped("sub2");
+    let s3 = tasks.make_task_unwrapped("sub3");
+    tasks.set_priority(Some(QUICK_PRIO));
+
+    assert_tasks_visible!(tasks, [s1, s2, s3]);
+    tasks.state = StateFilter::Default;
+    assert_tasks_view!(tasks, [s1, s2, s3]);
+    assert_tasks_visible!(tasks, [id_hp, s1, s2, s3]);
+    tasks.move_up();
+    tasks.set_search_depth(1);
+    assert_tasks_view!(tasks, [id_hp]);
+    assert_tasks_visible!(tasks, [s1, s2, s3, id_hp]);
+
+    tasks.set_priority(None);
+    let s4 = tasks.make_task_with("sub4", [tasks.make_event_tag_from_id(anid, MARKER_PARENT)], true).unwrap();
+    assert_eq!(tasks.get_parent(Some(&s4)), Some(&anid));
+    assert_tasks_view!(tasks, [anid, id_hp]);
+    // s2-4 are newest while s2,s3,hp are highest prio
+    assert_tasks_visible!(tasks, [s4, s2, s3, anid, id_hp]);
+
+    tasks.pubkey = Some(Keys::generate().public_key);
+}
+
+#[test]
+fn test_sibling_dependency() {
+    let mut tasks = stub_tasks();
+    let parent = tasks.make_task_unwrapped("parent");
+    let sub = tasks.submit(
+        EventBuilder::new(TASK_KIND, "sub")
+            .tags([tasks.make_event_tag_from_id(parent, MARKER_PARENT)]),
+    );
+    assert_tasks_view!(tasks, [parent]);
+    tasks.track_at(Timestamp::now(), Some(sub));
+    assert_eq!(tasks.get_own_events_history().count(), 1);
+    assert_tasks_view!(tasks, []);
+
+    tasks.make_dependent_sibling("sibling");
+    assert_eq!(tasks.len(), 3);
+    assert_eq!(tasks.viewed_tasks().len(), 2);
+}
+
+#[test]
+fn test_bookmarks() {
+    let mut tasks = stub_tasks();
+    let zero = EventId::all_zeros();
+    let test = tasks.make_task_unwrapped("test # tag");
+    let parent = tasks.make_task_unwrapped("parent");
+    assert_eq!(tasks.viewed_tasks().len(), 2);
+    tasks.move_to(Some(parent));
+    let pin = tasks.make_task_unwrapped("pin");
+
+    tasks.search_depth = 1;
+    assert_eq!(tasks.filtered_tasks(None, true).len(), 2);
+    assert_eq!(tasks.filtered_tasks(None, false).len(), 2);
+    assert_eq!(tasks.filtered_tasks(Some(zero), false).len(), 0);
+    assert_eq!(tasks.filtered_tasks(Some(parent), false).len(), 1);
+    assert_eq!(tasks.filtered_tasks(Some(pin), false).len(), 0);
+    assert_eq!(tasks.filtered_tasks(Some(zero), false).len(), 0);
+
+    tasks.submit(
+        EventBuilder::new(Kind::Bookmarks, "")
+            .tags([Tag::event(pin), Tag::event(zero)])
+    );
+    assert_eq!(tasks.viewed_tasks().len(), 1);
+    assert_eq!(tasks.filtered_tasks(Some(pin), true).len(), 0);
+    assert_eq!(tasks.filtered_tasks(Some(pin), false).len(), 0);
+    assert_eq!(tasks.filtered_tasks(Some(zero), true).len(), 0);
+    assert_eq!(
+        tasks.filtered_tasks(Some(zero), false),
+        vec![tasks.get_by_id(&pin).unwrap()]
+    );
+
+    tasks.move_to(None);
+    assert_eq!(tasks.view_depth, 0);
+    assert_tasks_visible!(tasks, [pin, test, parent]);
+    tasks.set_view_depth(1);
+    assert_tasks_visible!(tasks, [pin, test]);
+    tasks.add_tag("tag");
+    assert_tasks_visible!(tasks, [test]);
+    assert_eq!(
+        tasks.filtered_tasks(None, true),
+        vec![tasks.get_by_id(&test).unwrap()]
+    );
+
+    tasks.submit(EventBuilder::new(Kind::Bookmarks, ""));
+    assert!(tasks.bookmarks.is_empty());
+    tasks.clear_filters();
+    assert_tasks_visible!(tasks, [pin, test]);
+    tasks.set_view_depth(0);
+    tasks.custom_time = Some(now());
+    let mut new = (0..3).map(|t| tasks.make_task_unwrapped(t.to_string().as_str())).collect_vec();
+    // Show the newest tasks in quick access and remove old pin
+    new.extend([test, parent]);
+    assert_tasks_visible!(tasks, new);
+}
+
+#[test]
+fn test_procedures() {
+    let mut tasks = stub_tasks();
+    tasks.make_task_and_enter("proc # tags", State::Procedure);
+    assert_eq!(tasks.get_own_events_history().count(), 1);
+    let side = tasks.submit(
+        EventBuilder::new(TASK_KIND, "side")
+            .tags([tasks.make_event_tag(&tasks.get_current_task().unwrap().event, MARKER_DEPENDS)])
+    );
+    assert_eq!(tasks.viewed_tasks(), Vec::<&Task>::new());
+    let sub_id = tasks.make_task_unwrapped("sub");
+    assert_tasks_view!(tasks, [sub_id]);
+    assert_eq!(tasks.len(), 3);
+    let sub = tasks.get_by_id(&sub_id).unwrap();
+    assert_eq!(sub.find_dependents(), Vec::<&EventId>::new());
+}
+
+#[test]
+fn test_filter_or_create() {
+    let mut tasks = stub_tasks();
+    let zeros = EventId::all_zeros();
+    let zero = Some(zeros);
+
+    let id1 = tasks.filter_or_create(zero, "newer");
+    assert_eq!(tasks.len(), 1);
+    assert_eq!(tasks.viewed_tasks().len(), 0);
+    assert_eq!(tasks.get_by_id(&id1.unwrap()).unwrap().parent_id(), zero.as_ref());
+
+    tasks.move_to(zero);
+    assert_eq!(tasks.viewed_tasks().len(), 1);
+    let sub = tasks.make_task_unwrapped("test");
+    assert_eq!(tasks.len(), 2);
+    assert_eq!(tasks.viewed_tasks().len(), 2);
+    assert_eq!(tasks.get_by_id(&sub).unwrap().parent_id(), zero.as_ref());
+
+    // Do not substring match invisible subtask
+    let id2 = tasks.filter_or_create(None, "#new-is gold wrapped").unwrap();
+    assert_eq!(tasks.len(), 3);
+    assert_eq!(tasks.viewed_tasks().len(), 2);
+    let new2 = tasks.get_by_id(&id2).unwrap();
+    assert_eq!(new2.props, Default::default());
+
+    tasks.move_up();
+    assert_eq!(tasks.get_matching(tasks.get_position(), "wrapped").len(), 1);
+    assert_eq!(tasks.get_matching(tasks.get_position(), "new-i").len(), 1);
+    tasks.filter_or_create(None, "is gold");
+    assert_position!(tasks, id2);
+
+    assert_eq!(tasks.get_own_events_history().count(), 3);
+    // Global match
+    assert_eq!(tasks.filter_or_create(None, "newer"), None);
+    assert_position!(tasks, id1.unwrap());
+    assert_eq!(tasks.get_own_events_history().count(), 4);
+    assert_eq!(tasks.len(), 3);
+}
+
+#[test]
+fn test_history() {
+    let mut tasks = stub_tasks();
+    let zero = EventId::all_zeros();
+
+    tasks.track_at(Timestamp::now() - 3, Some(zero));
+    tasks.move_to(None);
+    assert_eq!(tasks.times_tracked(1).len(), 121);
+    let all = tasks.times_tracked(10);
+    assert_eq!(all.len(), 202, "{}", all);
+    assert!(all.contains(" 0000000000000000000000000000000000000000000000000000000000000000"), "{}", all);
+    assert!(all.ends_with(" ---"), "{}", all);
+}
+
+#[test]
+fn test_tracking() {
+    let mut tasks = stub_tasks();
+    let zero = EventId::all_zeros();
+
+    tasks.track_at(Timestamp::from(0), None);
+    assert_eq!(tasks.history.len(), 0);
+
+    let almost_now: Timestamp = Timestamp::now() - 12u64;
+    tasks.track_at(Timestamp::from(11), Some(zero));
+    tasks.track_at(Timestamp::from(13), Some(zero));
+    assert_position!(tasks, zero);
+    assert!(tasks.time_tracked(zero) > almost_now.as_u64());
+
+    // Because None is backtracked by one to avoid conflicts
+    tasks.track_at(Timestamp::from(22 + 1), None);
+    assert_eq!(tasks.get_own_events_history().count(), 2);
+    assert_eq!(tasks.time_tracked(zero), 11);
+    tasks.track_at(Timestamp::from(22 + 1), Some(zero));
+    assert_eq!(tasks.get_own_events_history().count(), 3);
+    assert!(tasks.time_tracked(zero) > 999);
+
+    let some = tasks.make_task_unwrapped("some");
+    tasks.track_at(Timestamp::from(22 + 1), Some(some));
+    assert_eq!(tasks.get_own_events_history().count(), 4);
+    assert_eq!(tasks.time_tracked(zero), 12);
+    assert!(tasks.time_tracked(some) > 999);
+
+    // TODO test received events
+}
+
+#[test]
+fn test_depth() {
+    let mut tasks = stub_tasks();
+
+    let t1 = tasks.make_note("t1");
+    let activity_t1 = tasks.get_by_id(&t1).unwrap();
+    assert!(!activity_t1.is_task());
+    assert_eq!(tasks.view_depth, 0);
+    assert_eq!(activity_t1.pure_state(), State::Open);
+    assert_eq!(tasks.viewed_tasks().len(), 1);
+    tasks.search_depth = 0;
+    assert_eq!(tasks.viewed_tasks().len(), 0);
+    tasks.recurse_activities = false;
+    assert_eq!(tasks.filtered_tasks(None, false).len(), 1);
+
+    tasks.move_to(Some(t1));
+    assert_position!(tasks, t1);
+    tasks.search_depth = 2;
+    assert_eq!(tasks.viewed_tasks().len(), 0);
+    let t11 = tasks.make_task_unwrapped("t11 # tag");
+    assert_eq!(tasks.viewed_tasks().len(), 1);
+    assert_eq!(tasks.get_task_path(Some(t11)), "t1>t11");
+    assert_eq!(tasks.get_relative_path(t11), "t11");
+    let t12 = tasks.make_task_unwrapped("t12");
+    assert_eq!(tasks.viewed_tasks().len(), 2);
+
+    tasks.move_to(Some(t11));
+    assert_position!(tasks, t11);
+    assert_eq!(tasks.viewed_tasks().len(), 0);
+    let t111 = tasks.make_task_unwrapped("t111");
+    assert_tasks_view!(tasks, [t111]);
+    assert_eq!(tasks.get_task_path(Some(t111)), "t1>t11>t111");
+    assert_eq!(tasks.get_relative_path(t111), "t111");
+    tasks.view_depth = 2;
+    assert_tasks_view!(tasks, [t111]);
+
+    assert_eq!(ChildrenTraversal::from(&tasks, EventId::all_zeros()).get_all().len(), 1);
+    assert_eq!(ChildrenTraversal::from(&tasks, EventId::all_zeros()).get_depth(0).len(), 1);
+    assert_eq!(ChildrenTraversal::from(&tasks, t1).get_depth(0).len(), 1);
+    assert_eq!(ChildrenTraversal::from(&tasks, t1).get_depth(1).len(), 3);
+    assert_eq!(ChildrenTraversal::from(&tasks, t1).get_depth(2).len(), 4);
+    assert_eq!(ChildrenTraversal::from(&tasks, t1).get_depth(9).len(), 4);
+    assert_eq!(ChildrenTraversal::from(&tasks, t1).get_all().len(), 4);
+
+    tasks.move_up();
+    assert_position!(tasks, t1);
+    assert_eq!(tasks.get_own_events_history().count(), 3);
+    assert_eq!(tasks.get_relative_path(t111), "t11>t111");
+    assert_eq!(tasks.view_depth, 2);
+    tasks.set_search_depth(1);
+    assert_tasks_view!(tasks, [t111, t12]);
+    tasks.set_view_depth(0);
+    assert_tasks_view!(tasks, [t11, t12]);
+    tasks.set_view(vec![t11]);
+    assert_tasks_view!(tasks, [t11]);
+    tasks.set_view_depth(1);
+    assert_tasks_view!(tasks, [t111]);
+    tasks.set_search_depth(2); // resets view
+    assert_tasks_view!(tasks, [t111, t12]);
+    tasks.set_view_depth(0);
+    assert_tasks_view!(tasks, [t11, t12]);
+
+    tasks.move_to(None);
+    tasks.recurse_activities = true;
+    assert_tasks_view!(tasks, [t11, t12]);
+    tasks.recurse_activities = false;
+    assert_tasks_view!(tasks, [t1]);
+    tasks.view_depth = 1;
+    assert_tasks_view!(tasks, [t11, t12]);
+    tasks.view_depth = 2;
+    assert_tasks_view!(tasks, [t111, t12]);
+    tasks.view_depth = 9;
+    assert_tasks_view!(tasks, [t111, t12]);
+
+    tasks.add_tag("tag");
+    assert_eq!(tasks.get_prompt_suffix(), " #tag");
+    tasks.view_depth = 0;
+    assert_tasks_view!(tasks, [t11]);
+    tasks.search_depth = 0;
+    assert_eq!(tasks.view, []);
+    assert_tasks_view!(tasks, []);
+
+    // Upwards
+    tasks.move_to(Some(t111));
+    assert_eq!(tasks.get_task_path(tasks.get_position()), "t1>t11>t111");
+    assert_eq!(tasks.up_by(1), Some(t11));
+    assert_eq!(tasks.up_by(2), Some(t1));
+    assert_eq!(tasks.up_by(4), None);
+    tasks.move_to(Some(t12));
+    assert_eq!(tasks.up_by(1), Some(t1));
+    assert_eq!(tasks.up_by(2), None);
+}
+
+#[test]
+fn test_empty_task_title_fallback_to_id() {
+    let mut tasks = stub_tasks();
+
+    let empty = tasks.make_task_unchecked("", vec![]);
+    let empty_task = tasks.get_by_id(&empty).unwrap();
+    let empty_id = empty_task.get_id().to_string();
+    assert_eq!(empty_task.get_title(), empty_id);
+    assert_eq!(tasks.get_task_path(Some(empty)), empty_id);
+}
+
+#[test]
+fn test_short_task() {
+    let mut tasks = stub_tasks();
+    let str = " # one";
+    assert_eq!(extract_tags(str, &tasks.users), ("".to_string(), vec![to_hashtag_tag("one")]));
+    assert_eq!(tasks.make_task(str), None);
+}
+
+#[test]
+fn test_unknown_task() {
+    let mut tasks = stub_tasks();
+
+    let zero = EventId::all_zeros();
+    assert_eq!(tasks.get_task_path(Some(zero)), zero.to_string());
+    tasks.move_to(Some(zero));
+    let dangling = tasks.make_task_unwrapped("test");
+    assert_eq!(
+        tasks.get_task_path(Some(dangling)),
+        "0000000000000000000000000000000000000000000000000000000000000000>test"
+    );
+    assert_eq!(tasks.get_relative_path(dangling), "test");
+
+    tasks.move_to(Some(dangling));
+    assert_eq!(tasks.up_by(0), Some(dangling));
+    assert_eq!(tasks.up_by(1), Some(zero));
+    assert_eq!(tasks.up_by(2), None);
+}
+
+#[allow(dead_code)] // #[test]
+fn test_itertools() {
+    use itertools::Itertools;
+    assert_eq!("test  toast".split(' ').collect_vec().len(), 3);
+    assert_eq!("test  toast".split_ascii_whitespace().collect_vec().len(), 2);
+}