dotfiles/.config/shell/git

# Tools
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() {
	test "$1" = "config" || case "$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 "$@"
				return
			fi;;
	esac
	command git "$@";
}

# Log local and upstream commits side by side - useful to check before forcing an action
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
}

# Shortcuts
alias gcap!='git commit --all --amend --no-edit && git push --force-with-lease'
gitweek() { git my --after "$(date -d "Mon ${1:-1} weeks ago")" --before "$(date -d "Mon $(expr ${1:-1} - 1) weeks ago")" "${@:2}" }
# Find a commit that follows the given one - second argument can be used to specify the search range
gitchild() { git log --reverse --ancestry-path --pretty=%H $1..${2:-HEAD} | head -1; }

# Caching
gitrecache() {
	git rm --cached --quiet -r ${1:-.}
	git add ${1:-.}
	git status -s
}
gitrestore() {
	git reset -- "$@"
	git checkout -- "$@"
}

# Branches
alias gitrmgonebranches='git fetch -p && for branch in `git branch -vv | grep ": gone]" | cut -d" " -f3`; do git branch -D "$branch"; done'
gitrebranch() {
	branch=${1:-$(git curbranch)}
	test "$(git curbranch)" = "$branch" && git checkout ${2:-master}
	git branch -D $branch
	git checkout -b $branch
}
gitrmbranch() {
	branch=${1:-$(git curbranch)}
	git push -d $(git rev-parse --abbrev-ref $branch@{u} | sed 's/\// /' || echo origin $branch)
	test $1 || 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
	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 "$3" = "btl" && 3="betweenthelinesev"
		echo "git@git${1:-hub}.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 hub "$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"; }