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814fed8dcacd457b7588bc224e25ec3a11569d55
[etc/zsh.git] / .zsh / zshrc / 85_vcs_prompt
1 # zshrc/85_git_prompt
2 #
3 # Make git information available to the prompt
4 #
5 # Copyright © 1994–2008 martin f. krafft <madduck@madduck.net>
6 # Released under the terms of the Artistic Licence 2.0
7 #
8 # Source repository: http://git.madduck.net/v/etc/zsh.git
9 #
10 # Shamelessly based on http://glandium.org/blog/?p=170
11 #
12
13 __git_get_repo_root()
14 {
15   local relroot
16   relroot="$(git rev-parse --show-cdup 2>/dev/null)" || return 1
17   if [ -n "$relroot" ]; then
18     readlink -f "$relroot"
19   else
20     echo $PWD
21   fi
22 }
23
24 __git_get_branch()
25 {
26   local ref
27   ref=$(git symbolic-ref -q HEAD 2>/dev/null \
28      || git-name-rev --name-only HEAD 2>/dev/null)
29   echo "${ref#refs/heads/}"
30 }
31
32 __get_root_offsets()
33 {
34   local pwda reporoot loc
35   pwda=(${(s:/:)PWD})
36   reporoot=(${(s:/:)1})
37   echo $((1 - $#reporoot)) $(($#pwda - $#reporoot))
38 }
39
40 __get_prompt_path_components()
41 {
42   local reporoot
43   reporoot="$1"
44
45   set -- $(__get_root_offsets "$reporoot")
46   if [ "$2" -le 0 ]; then
47     echo %~
48   else
49     echo "%${1}~" "%${2}~"
50   fi
51 }
52
53 __vcs_get_repo_type()
54 {
55   while true; do
56     [ -d .git ] && echo git && break
57     [ -d .bzr ] && echo bzr && break
58     [ -d .hg ] && echo hg && break
59     [ -d .svn ] && echo svn && break
60     [ -d CVS ] && echo cvs && break
61     [ "$PWD" = / ] && echo NONE && return 1
62     cd ..
63   done
64 }
65
66 __vcs_set_prompt_variables()
67 {
68   local pre branch post
69   local MAXLEN=25
70   local repotype="${1:-$(__vcs_get_repo_type)}"
71
72   case "$repotype" in
73     git)
74       local reporoot="$(__git_get_repo_root)"
75       set -- $(__get_prompt_path_components "$reporoot")
76       branch="$(__git_get_branch)"
77       post="${(%)2}"
78       local prelen="$((MAXLEN - $#post - $#branch))"
79       [ $prelen -lt 10 ] && prelen=10
80       pre="%${prelen}<..<${1}%<<"
81       pre="${(%)pre}"
82       ;;
83     *)
84       case "$repotype" in
85         NONE) :;;
86         *) warn "$repotype repositories not (yet) supported in the prompt";;
87       esac
88       local p="%${MAXLEN}<..<%~%<<"
89       #TODO find a better way so we don't have to nuke $psvar, but since the
90       #     %(nv.true.false) check for prompts checks element count, not
91       #     content, that's all we get for now
92       psvar=("${(%)p}")
93       return
94   esac
95
96   psvar[1]="$pre"
97   psvar[2]="$branch"
98   psvar[3]="$post"
99 }
100
101 if ! is_root; then
102   # too dangerous to be run as root
103
104   _update_vcs_prompt_vars_if_vcs_ran() {
105     local vcs="$(__vcs_get_repo_type)"
106     case "$(history $(($HISTCMD - 1)))" in
107       # $vcs appeared in last command, so be sure to update
108       *${vcs}*) __vcs_set_prompt_variables
109     esac
110   }
111   precmd_functions+=_update_vcs_prompt_vars_if_vcs_ran
112
113   _update_vcs_prompt_vars() {
114     __vcs_set_prompt_variables
115   }
116   chpwd_functions+=_update_vcs_prompt_vars
117
118   # call it once
119   _update_vcs_prompt_vars
120 fi
121
122 # vim:ft=zsh