--- /dev/null
+#
+# Git shell integration
+#
+# Copyright © 2018 martin f. krafft <madduck@madduck.net>
+# Released under the terms of the Artistic Licence 2.0
+#
+# Source repository: http://git.madduck.net/v/etc/zsh.git
+#
+
+__is_git_repo()
+{
+ emulate -L zsh
+ git rev-parse --is-inside-work-tree >/dev/null 2>&1
+}
+
+__git_get_reporoot()
+{
+ emulate -L zsh
+ # return the full path to the root of the current git repository
+ [ -d "$GIT_DIR" ] && echo "$GIT_DIR" && return 0
+ local dir; dir="$PWD/$(git rev-parse --show-cdup)"
+ # do not use --show-toplevel because it resolves symlinks
+ echo $dir:a
+}
+
+__git_get_branch()
+{
+ emulate -L zsh
+ # use oh-my-zsh prompt info function if it exists
+ $(command -v git_prompt_info) && return
+
+ # return the name of the git branch we're on
+ local ref gitdir
+ gitdir="$(git rev-parse --git-dir)"
+ ref=$(git --git-dir="$gitdir" symbolic-ref -q HEAD 2>/dev/null \
+ || git --git-dir="$gitdir" name-rev --name-only HEAD 2>/dev/null) || return 1
+ echo "${ref#refs/heads/}"
+}
+
+__git_set_prompt_variable() {
+ __is_git_repo || return
+
+ local reporoot="$(__git_get_reporoot)" ||
+ { zerror "could not determine git repository root"; return 1 }
+ local branch="$(__git_get_branch)" ||
+ { zerror "could not determine git branch"; return 1 }
+ if [ -n "$VCSH_REPO_NAME" ]; then
+ # if vcsh is used to get a subshell, then the repo root is the home
+ # directory, but we want to indicate the vcsh context too:
+ eval set -- $(__vcs_get_prompt_path_components "$HOME" "$branch")
+ set -- "vcsh:$VCSH_REPO_NAME" "$2" "$1${3:+/$3}"
+ else
+ eval set -- $(__vcs_get_prompt_path_components "$reporoot" "$branch")
+ if [ -d "$GIT_DIR" ]; then
+ set -- "${(D)GIT_DIR}" "$2" "${${1#$_D}%/}"
+ fi
+ fi
+ psvar[4]="$1${2:+|%B$2%b|}${3:-}"
+}
+add-zsh-hook chpwd __git_set_prompt_variable
+__git_set_prompt_variable
+
+__git_print_preprompt()
+{
+ [[ $? -eq 0 ]] || return
+ emulate -L zsh
+ __is_git_repo || return
+ [ "$(git config --get core.bare)" = false ] || return
+ __on_networkfs && return
+
+ local COLUMNS=${COLUMNS:-80}
+ local LINES=${LINES:-25}
+
+ function output() {
+ emulate -L zsh
+ local title="$@"
+ local output; output=(${(f)"$(cat)"})
+
+ [[ ${#output} -ge 1 ]] || return
+
+ local statl="$(echo ${output[-1]} | sed -re 's@^\s*([0-9]+)[^,]+(, ([0-9]+) [^(]+\(([-+])\))(, ([0-9]+) [^(]+\(([-+])\))?@\1/\4\3/\7\6@')"
+
+ if [[ ${output[-2]## } = '...' ]]; then
+ print "${title} (${statl%/}, abbrev.):"
+ print "${(F)output[1,-3]}"
+ print " …"
+ else
+ print "${title} (${statl%/}):"
+ print "${(F)output[1,-2]}"
+ fi
+ }
+
+ function gitdiffstat() {
+ emulate -L zsh
+ local common_options="--stat=$((COLUMNS/2-1)),$((COLUMNS/4-2)),$(($LINES/3)) --relative"
+ eval git diff $common_options "$@" 2>/dev/null
+ }
+
+ local cached; cached=(${(f)"$(gitdiffstat --cached | output cached)"})
+ local changed; changed=(${(f)"$(gitdiffstat | output changed)"})
+
+ local max=${#changed}
+ [[ $max -lt ${#cached} ]] && max=${#cached}
+
+ ((max == 0)) && return
+
+ local width=$(((COLUMNS-3)/2))
+
+ if (( ${#cached} > 0 && ${#changed} > 0 )); then
+ local i
+ for (( i=1 ; i <= max ; i++ )) do
+ printf "%-${width}s │ %-${width}s\n" "${cached[$i]}" "${changed[$i]}"
+ done
+ else
+ print ${(F)cached}${(F)changed}
+ fi
+}
+add-zsh-hook precmd __git_print_preprompt
+
+# vim:ft=zsh