dotfiles/.config/shell/git

# Tools
alias g="git"
alias bfg="java -jar $HOME/daten/applications/bfg-1.13.0.jar"
alias magit='nvim -c MagitOnly'

# if in home or under XDG_CONFIG_HOME and not within a git directory, replace git by yadm
git() {
  case "$1" in
    config) ;;
    clone) ;;
    *) case "$PWD" in
    $HOME|$XDG_CONFIG_HOME|$LAST_YADM)
      yadm "$@"
      return
      ;;
    $XDG_CONFIG_HOME*)
      if ! command git rev-parse --show-toplevel &>/dev/null; then
        export LAST_YADM="$PWD"
        yadm "$@"
        return
      fi;;
    esac;;
  esac
  command git "$@";
}

# Log local and upstream commits side by side - useful to check when the history has been manipulated
glno() {
  loc="$(git l --color=always "$@")"
  upstream="$(git l --color=always $(git upstream) "$@")"
  a=$(echo $loc | wc -l)
  b=$(echo $upstream | wc -l)
  halfcols="$(($(tput cols) / 2))"
  for i in `seq 1 $([ $a -le $b ] && echo "$a" || echo "$b")`; do
    printf "%-${halfcols}s %s\n" "$(echo $loc | head -n $i | tail -1)" "$(echo $upstream | head -n $i | tail -1)"
  done
}

# BRANCHES
# Cleans up remote branches and removes branches where the remote-tracking branches got removed.
alias gitrmgonebranches='git fetch -p && for branch in `git branch -vv | grep ": gone]" | cut -d" " -f3`; do git branch -D "$branch"; done'
# Recreates the current or given branch with the state from master or another given branch.
gitrebranch() {
  branch=${1:-$(git curbranch)}
  test "$(git curbranch)" = "$branch" && git checkout ${2:-master}
  git branch -D $branch
  git checkout -b $branch
}
# Removes the given branch locally and remotely.
# With no argument it switches to the default branch and deletes the current branch.
gitrmbranch() {
  branch=${1:-$(git curbranch)}
  git push -d $(git rev-parse --abbrev-ref $branch@{push} | sed 's/\// /' || echo origin $branch)
  test $1 || git checkout main || git checkout master || git checkout $(cat .git/refs/remotes/origin/HEAD | cut -d'/' -f4)
  git branch -D $branch
}

# Save HEAD commit hash to "snap" file in git dir
gitsnap() { echo Snapped $(git rev-parse HEAD | tee "$(git dir)/${1:-snap}") }
# Hard reset HEAD to commit in "snap"-file
gitsnaprestore() { git reset --hard $(cat "$(git dir)/${1:-snap}") }

# Remove list of tags local & remote
gitrmtag() {
  declare -a refs
  local index=1
  for tag in $@; do refs[index++]=":refs/tags/$tag"; done
  git push origin "${refs[@]}" && git tag -d "$@"
}
# Rename a tag
gitretag() {
  git push origin refs/tags/${1}:refs/tags/${2} :refs/tags/$1 && git tag -d $1
}

# Repo management {{{
gitinit() {
  git init -b main
  git add .
  git commit -m "First strike"
  gitorigin "$@"
  git push
}

gitbackup() {
  p=$(basename $PWD)
  builtin cd ..
  git clone --mirror $p
  cd $p
}

project() {
  cd $projects_dir
  if [ -d $2 ]
  then cd "$2" && gitorigin "$@"
  else gitclone "$@"
  fi
}

gitremote() {
  case "$1" in
  http*)  echo "git@$(echo "$1" | cut -d'/' -f3):$(echo "$1" | cut -d'/' -f4)/$(echo "$1" | cut -d'/' -f5)" ;;
  git:*)  echo "$1" ;;
  *)  test "$3" = "cau" && 3="CAU-Kiel-Tech-Inf"
    test "$3" = "btl" && 3="betweenthelinesev"
    echo "git@${1:-github.com}:${3:-xerus2000}/${2:-$(basename $PWD)}.git" ;;
  esac
}

gitclone() {
  remote=$(gitremote "$@")
  echo $remote
  git clone $remote ${@:4}
  cd "$(test $4 && echo $4 || basename ${remote/.git})"
}

gitfork() {
  builtin cd "$projects_dir/_forks"
  gitclone hub "$1" "" "$3" --recurse-submodules
  test "$2" && git remote add upstream "$(gitremote github "$1" "$2")"
  git remote -v
}

# set repo as origin and set all branches upstream to their respective remote branch, if available
gitorigin() {
  git remote remove origin 2>/dev/null
  git remote add origin $(gitremote "$@")
  git remote -v && git fetch || ( last=$? && echo "git fetch failed, aborting\!" && return $last )

  git branch | sed 's/ //g' | sed 's/*//' | while read branch
  do test $(git branch -a | grep origin/$branch | wc -l) -gt 0 && git branch -u origin/$branch $branch
  done
}

# set repo as upstream or add a new remote
gitupstream() {
  if test "$2"
  then local name="$2"; git remote remove "$2" >/dev/null
  else git remote get-url upstream &>/dev/null && local name="$1" || local name="upstream"
  fi
  local origin="$(git remote get-url origin)"
  git remote add -f $name "$(echo $origin | cut -d':' -f1):$1/$(echo $origin | cut -d'/' -f2)"
  git remote -v
}
# }}}

# Rewriting history {{{

# gets the AuthorDate of a given committish
git-authordate() {
  local date=$(git log --pretty=fuller --date=raw -1 $1 | grep AuthorDate)
  echo ${date##*: }
}
# executes a git command (usually commit) with the date of a given committish
git-withdate() {
  date=$(git-authordate $1)
  GIT_AUTHOR_DATE="$date" GIT_COMMITTER_DATE="$date" git "${@:2}"
}

# takes all changes in the current working tree and amends them to the given commit
gitedit() {
  git stash
  gitcommits -q $1
  git reset --hard $1
  git stash pop -q
  git-withdate $1 commit --all --amend "${@:2}"
  gitcommits
}

# takes two committishs and squashes them with all commits between them into a single commit
# this will rewrite the full history from then on, but should not create any conflicts
gitsquash() {
  local -a options
  while [ $# -gt 0 ]; do
    case $1 in
      -i) ignore=true; shift 1;;
      -f|--force) force=true; shift 1;;
      -*) options+=($1); exit 1;;
      *) break;;
    esac
  done

  ((#!=2)) && echo "Usage: [options] <startcommit> <endcommit>" && return 1
  [[ -n $(git status -s) ]] && [ ! $force ] && echo -e "Tree is dirty, commit or stash your changes first!\nIf you want to execute the command regardless, run again with --force" && return 1

  1=$(git rev-parse $1)
  2=$(git rev-parse $2)
  [ $(git rev-list $1 --count) -lt $(git rev-list $2 --count) ] && t=$1 && 1=$2 && 2=$t

  gitcommits -q $1
  git reset --hard $1
  if [ $(git rev-list $2 --count) = 1 ]; then
    git update-ref -d HEAD
    git add .
    git-withdate $1 commit -c $1
  else
    git reset -q $2
    git add .
    git commit --amend
  fi
  gitcommits
}

# given a committish, this command saves a list of commits between the HEAD and the given committish into the .git directory
# when ran without parameters it applies the saved list of commits onto the current HEAD
gitcommits() {
  verbosity=1
  while [[ $# -gt 0 ]]; do
    case $1 in
      -v) verbosity=2; shift 1;;
      -q|--quiet) verbosity=0; shift 1;;
      --theirs) params=(-X theirs); shift 1;;
      *) break;;
    esac
  done

  stashed="$(git rev-parse --show-toplevel)/.git/stashed-commits"
  if [ $1 ]; then
    if [ $verbosity -eq 0 ]
      then git rev-list --reverse HEAD...$1 >$stashed
      else git rev-list --reverse HEAD...$1 | tee $stashed
    fi
  else
    local aborted
    for commit in $(cat $stashed); do
      [ $aborted ] && rest+=($commit) && continue
      [ $verbosity -gt 0 ] && git --no-pager log --oneline -1 $commit
      git-withdate $commit cherry-pick $commit ${params:0} >/dev/null
      last=$?
      [ $last -gt 0 ] && aborted=true && typeset -a rest && continue
      [ $verbosity -gt 0 ] && echo -e "\e[1A$(git log --color=always --pretty=format:"%C(yellow)$(git rev-parse --short HEAD^^)%C(bold) -> %Creset%C(yellow)%h%Creset %s" -1)"
      [ $verbosity -gt 1 ] && git status -s
    done
    echo $rest >$stashed
    [ $aborted ] && echo "A problem was encountered. Fix it and run 'gitcommits' again to apply the remaining ${#rest} commits."
  fi
}
# }}}

# Testing
gittestcommit() { touch file$((++i)) && git add . && git commit -m "Create file$i"; }