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[url "git://git.madduck.net/madduck/"]
  insteadOf = madduck:

Update Git shell integration
[etc/git.git] / .zsh / zshrc / parts.d / 50-git
1 #
2 # Git shell integration
3 #
4 # Copyright © 2018 martin f. krafft <madduck@madduck.net>
5 # Released under the terms of the Artistic Licence 2.0
6 #
7 # Source repository: http://git.madduck.net/v/etc/zsh.git
8 #
9
10 __is_git_repo()
11 {
12   emulate -L zsh
13   git rev-parse --is-inside-work-tree >/dev/null 2>&1
14 }
15
16 __git_get_reporoot()
17 {
18   emulate -L zsh
19   # return the full path to the root of the current git repository
20   [ -d "$GIT_DIR" ] && echo "$GIT_DIR" && return 0
21   local dir; dir="$PWD/$(git rev-parse --show-cdup)"
22   # do not use --show-toplevel because it resolves symlinks
23   echo $dir:a
24 }
25
26 __git_get_branch()
27 {
28   emulate -L zsh
29   # use oh-my-zsh prompt info function if it exists
30   $(command -v git_prompt_info) && return
31
32   # return the name of the git branch we're on
33   local ref gitdir
34   gitdir="$(git rev-parse --git-dir)"
35   ref=$(git --git-dir="$gitdir" symbolic-ref -q HEAD 2>/dev/null \
36      || git --git-dir="$gitdir" name-rev --name-only HEAD 2>/dev/null) || return 1
37   echo "${ref#refs/heads/}"
38 }
39
40 __git_set_prompt_variable() {
41   __is_git_repo || return
42
43   local reporoot="$(__git_get_reporoot)" ||
44     { zerror "could not determine git repository root"; return 1 }
45   local branch="$(__git_get_branch)" ||
46     { zerror "could not determine git branch"; return 1 }
47   if [ -n "$VCSH_REPO_NAME" ]; then
48     # if vcsh is used to get a subshell, then the repo root is the home
49     # directory, but we want to indicate the vcsh context too:
50     eval set -- $(__vcs_get_prompt_path_components "$HOME" "$branch")
51     set -- "vcsh:$VCSH_REPO_NAME" "$2" "$1${3:+/$3}"
52   else
53     eval set -- $(__vcs_get_prompt_path_components "$reporoot" "$branch")
54     if [ -d "$GIT_DIR" ]; then
55       set -- "${(D)GIT_DIR}" "$2" "${${1#$_D}%/}"
56     fi
57   fi
58   psvar[4]="$1${2:+|%B$2%b|}${3:-}"
59 }
60 add-zsh-hook chpwd __git_set_prompt_variable
61 __git_set_prompt_variable
62
63 __git_print_preprompt()
64 {
65   [[ $? -eq 0 ]] || return
66   emulate -L zsh
67   __is_git_repo || return
68   [ "$(git config --get core.bare)" = false ] || return
69   __on_networkfs && return
70
71   local COLUMNS=${COLUMNS:-80}
72   local LINES=${LINES:-25}
73
74   function output() {
75     emulate -L zsh
76     local title="$@"
77     local output; output=(${(f)"$(cat)"})
78
79     [[ ${#output} -ge 1 ]] || return
80
81     local statl="$(echo ${output[-1]} | sed -re 's@^\s*([0-9]+)[^,]+(, ([0-9]+) [^(]+\(([-+])\))(, ([0-9]+) [^(]+\(([-+])\))?@\1/\4\3/\7\6@')"
82
83     if [[ ${output[-2]## } = '...' ]]; then
84       print "${title} (${statl%/}, abbrev.):"
85       print "${(F)output[1,-3]}"
86       print " …"
87     else
88       print "${title} (${statl%/}):"
89       print "${(F)output[1,-2]}"
90     fi
91   }
92
93   function gitdiffstat() {
94     emulate -L zsh
95     local common_options="--stat=$((COLUMNS/2-1)),$((COLUMNS/4-2)),$(($LINES/3)) --relative"
96     eval git diff $common_options "$@" 2>/dev/null
97   }
98
99   local cached; cached=(${(f)"$(gitdiffstat --cached | output cached)"})
100   local changed; changed=(${(f)"$(gitdiffstat | output changed)"})
101
102   local max=${#changed}
103   [[ $max -lt ${#cached} ]] && max=${#cached}
104
105   ((max == 0)) && return
106
107   local width=$(((COLUMNS-3)/2))
108
109   if (( ${#cached} > 0 && ${#changed} > 0 )); then
110     local i
111     for (( i=1 ; i <= max ; i++ )) do
112       printf "%-${width}s │ %-${width}s\n" "${cached[$i]}" "${changed[$i]}"
113     done
114   else
115     print ${(F)cached}${(F)changed}
116   fi
117 }
118 add-zsh-hook precmd __git_print_preprompt
119
120 # vim:ft=zsh