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[thirdparty/git.git] / contrib / completion / git-prompt.sh
1 # bash/zsh git prompt support
2 #
3 # Copyright (C) 2006,2007 Shawn O. Pearce <spearce@spearce.org>
4 # Distributed under the GNU General Public License, version 2.0.
5 #
6 # This script allows you to see repository status in your prompt.
7 #
8 # To enable:
9 #
10 # 1) Copy this file to somewhere (e.g. ~/.git-prompt.sh).
11 # 2) Add the following line to your .bashrc/.zshrc:
12 # source ~/.git-prompt.sh
13 # 3a) Change your PS1 to call __git_ps1 as
14 # command-substitution:
15 # Bash: PS1='[\u@\h \W$(__git_ps1 " (%s)")]\$ '
16 # ZSH: setopt PROMPT_SUBST ; PS1='[%n@%m %c$(__git_ps1 " (%s)")]\$ '
17 # the optional argument will be used as format string.
18 # 3b) Alternatively, for a slightly faster prompt, __git_ps1 can
19 # be used for PROMPT_COMMAND in Bash or for precmd() in Zsh
20 # with two parameters, <pre> and <post>, which are strings
21 # you would put in $PS1 before and after the status string
22 # generated by the git-prompt machinery. e.g.
23 # Bash: PROMPT_COMMAND='__git_ps1 "\u@\h:\w" "\\\$ "'
24 # will show username, at-sign, host, colon, cwd, then
25 # various status string, followed by dollar and SP, as
26 # your prompt.
27 # ZSH: precmd () { __git_ps1 "%n" ":%~$ " "|%s" }
28 # will show username, pipe, then various status string,
29 # followed by colon, cwd, dollar and SP, as your prompt.
30 # Optionally, you can supply a third argument with a printf
31 # format string to finetune the output of the branch status
32 #
33 # The repository status will be displayed only if you are currently in a
34 # git repository. The %s token is the placeholder for the shown status.
35 #
36 # The prompt status always includes the current branch name.
37 #
38 # In addition, if you set GIT_PS1_SHOWDIRTYSTATE to a nonempty value,
39 # unstaged (*) and staged (+) changes will be shown next to the branch
40 # name. You can configure this per-repository with the
41 # bash.showDirtyState variable, which defaults to true once
42 # GIT_PS1_SHOWDIRTYSTATE is enabled.
43 #
44 # You can also see if currently something is stashed, by setting
45 # GIT_PS1_SHOWSTASHSTATE to a nonempty value. If something is stashed,
46 # then a '$' will be shown next to the branch name.
47 #
48 # If you would like to see if there're untracked files, then you can set
49 # GIT_PS1_SHOWUNTRACKEDFILES to a nonempty value. If there're untracked
50 # files, then a '%' will be shown next to the branch name. You can
51 # configure this per-repository with the bash.showUntrackedFiles
52 # variable, which defaults to true once GIT_PS1_SHOWUNTRACKEDFILES is
53 # enabled.
54 #
55 # If you would like to see the difference between HEAD and its upstream,
56 # set GIT_PS1_SHOWUPSTREAM="auto". A "<" indicates you are behind, ">"
57 # indicates you are ahead, "<>" indicates you have diverged and "="
58 # indicates that there is no difference. You can further control
59 # behaviour by setting GIT_PS1_SHOWUPSTREAM to a space-separated list
60 # of values:
61 #
62 # verbose show number of commits ahead/behind (+/-) upstream
63 # name if verbose, then also show the upstream abbrev name
64 # legacy don't use the '--count' option available in recent
65 # versions of git-rev-list
66 # git always compare HEAD to @{upstream}
67 # svn always compare HEAD to your SVN upstream
68 #
69 # You can change the separator between the branch name and the above
70 # state symbols by setting GIT_PS1_STATESEPARATOR. The default separator
71 # is SP.
72 #
73 # When there is an in-progress operation such as a merge, rebase,
74 # revert, cherry-pick, or bisect, the prompt will include information
75 # related to the operation, often in the form "|<OPERATION-NAME>".
76 #
77 # When the repository has a sparse-checkout, a notification of the form
78 # "|SPARSE" will be included in the prompt. This can be shortened to a
79 # single '?' character by setting GIT_PS1_COMPRESSSPARSESTATE, or omitted
80 # by setting GIT_PS1_OMITSPARSESTATE.
81 #
82 # By default, __git_ps1 will compare HEAD to your SVN upstream if it can
83 # find one, or @{upstream} otherwise. Once you have set
84 # GIT_PS1_SHOWUPSTREAM, you can override it on a per-repository basis by
85 # setting the bash.showUpstream config variable.
86 #
87 # If you would like to see more information about the identity of
88 # commits checked out as a detached HEAD, set GIT_PS1_DESCRIBE_STYLE
89 # to one of these values:
90 #
91 # contains relative to newer annotated tag (v1.6.3.2~35)
92 # branch relative to newer tag or branch (master~4)
93 # describe relative to older annotated tag (v1.6.3.1-13-gdd42c2f)
94 # tag relative to any older tag (v1.6.3.1-13-gdd42c2f)
95 # default exactly matching tag
96 #
97 # If you would like a colored hint about the current dirty state, set
98 # GIT_PS1_SHOWCOLORHINTS to a nonempty value. The colors are based on
99 # the colored output of "git status -sb" and are available only when
100 # using __git_ps1 for PROMPT_COMMAND or precmd in Bash,
101 # but always available in Zsh.
102 #
103 # If you would like __git_ps1 to do nothing in the case when the current
104 # directory is set up to be ignored by git, then set
105 # GIT_PS1_HIDE_IF_PWD_IGNORED to a nonempty value. Override this on the
106 # repository level by setting bash.hideIfPwdIgnored to "false".
107
108 # check whether printf supports -v
109 __git_printf_supports_v=
110 printf -v __git_printf_supports_v -- '%s' yes >/dev/null 2>&1
111
112 # stores the divergence from upstream in $p
113 # used by GIT_PS1_SHOWUPSTREAM
114 __git_ps1_show_upstream ()
115 {
116 local key value
117 local svn_remote svn_url_pattern count n
118 local upstream=git legacy="" verbose="" name=""
119
120 svn_remote=()
121 # get some config options from git-config
122 local output="$(git config -z --get-regexp '^(svn-remote\..*\.url|bash\.showupstream)$' 2>/dev/null | tr '\0\n' '\n ')"
123 while read -r key value; do
124 case "$key" in
125 bash.showupstream)
126 GIT_PS1_SHOWUPSTREAM="$value"
127 if [[ -z "${GIT_PS1_SHOWUPSTREAM}" ]]; then
128 p=""
129 return
130 fi
131 ;;
132 svn-remote.*.url)
133 svn_remote[$((${#svn_remote[@]} + 1))]="$value"
134 svn_url_pattern="$svn_url_pattern\\|$value"
135 upstream=svn+git # default upstream is SVN if available, else git
136 ;;
137 esac
138 done <<< "$output"
139
140 # parse configuration values
141 local option
142 for option in ${GIT_PS1_SHOWUPSTREAM}; do
143 case "$option" in
144 git|svn) upstream="$option" ;;
145 verbose) verbose=1 ;;
146 legacy) legacy=1 ;;
147 name) name=1 ;;
148 esac
149 done
150
151 # Find our upstream
152 case "$upstream" in
153 git) upstream="@{upstream}" ;;
154 svn*)
155 # get the upstream from the "git-svn-id: ..." in a commit message
156 # (git-svn uses essentially the same procedure internally)
157 local -a svn_upstream
158 svn_upstream=($(git log --first-parent -1 \
159 --grep="^git-svn-id: \(${svn_url_pattern#??}\)" 2>/dev/null))
160 if [[ 0 -ne ${#svn_upstream[@]} ]]; then
161 svn_upstream=${svn_upstream[${#svn_upstream[@]} - 2]}
162 svn_upstream=${svn_upstream%@*}
163 local n_stop="${#svn_remote[@]}"
164 for ((n=1; n <= n_stop; n++)); do
165 svn_upstream=${svn_upstream#${svn_remote[$n]}}
166 done
167
168 if [[ -z "$svn_upstream" ]]; then
169 # default branch name for checkouts with no layout:
170 upstream=${GIT_SVN_ID:-git-svn}
171 else
172 upstream=${svn_upstream#/}
173 fi
174 elif [[ "svn+git" = "$upstream" ]]; then
175 upstream="@{upstream}"
176 fi
177 ;;
178 esac
179
180 # Find how many commits we are ahead/behind our upstream
181 if [[ -z "$legacy" ]]; then
182 count="$(git rev-list --count --left-right \
183 "$upstream"...HEAD 2>/dev/null)"
184 else
185 # produce equivalent output to --count for older versions of git
186 local commits
187 if commits="$(git rev-list --left-right "$upstream"...HEAD 2>/dev/null)"
188 then
189 local commit behind=0 ahead=0
190 for commit in $commits
191 do
192 case "$commit" in
193 "<"*) ((behind++)) ;;
194 *) ((ahead++)) ;;
195 esac
196 done
197 count="$behind $ahead"
198 else
199 count=""
200 fi
201 fi
202
203 # calculate the result
204 if [[ -z "$verbose" ]]; then
205 case "$count" in
206 "") # no upstream
207 p="" ;;
208 "0 0") # equal to upstream
209 p="=" ;;
210 "0 "*) # ahead of upstream
211 p=">" ;;
212 *" 0") # behind upstream
213 p="<" ;;
214 *) # diverged from upstream
215 p="<>" ;;
216 esac
217 else
218 case "$count" in
219 "") # no upstream
220 p="" ;;
221 "0 0") # equal to upstream
222 p=" u=" ;;
223 "0 "*) # ahead of upstream
224 p=" u+${count#0 }" ;;
225 *" 0") # behind upstream
226 p=" u-${count% 0}" ;;
227 *) # diverged from upstream
228 p=" u+${count#* }-${count% *}" ;;
229 esac
230 if [[ -n "$count" && -n "$name" ]]; then
231 __git_ps1_upstream_name=$(git rev-parse \
232 --abbrev-ref "$upstream" 2>/dev/null)
233 if [ $pcmode = yes ] && [ $ps1_expanded = yes ]; then
234 p="$p \${__git_ps1_upstream_name}"
235 else
236 p="$p ${__git_ps1_upstream_name}"
237 # not needed anymore; keep user's
238 # environment clean
239 unset __git_ps1_upstream_name
240 fi
241 fi
242 fi
243
244 }
245
246 # Helper function that is meant to be called from __git_ps1. It
247 # injects color codes into the appropriate gitstring variables used
248 # to build a gitstring.
249 __git_ps1_colorize_gitstring ()
250 {
251 if [[ -n ${ZSH_VERSION-} ]]; then
252 local c_red='%F{red}'
253 local c_green='%F{green}'
254 local c_lblue='%F{blue}'
255 local c_clear='%f'
256 else
257 # Using \[ and \] around colors is necessary to prevent
258 # issues with command line editing/browsing/completion!
259 local c_red='\[\e[31m\]'
260 local c_green='\[\e[32m\]'
261 local c_lblue='\[\e[1;34m\]'
262 local c_clear='\[\e[0m\]'
263 fi
264 local bad_color=$c_red
265 local ok_color=$c_green
266 local flags_color="$c_lblue"
267
268 local branch_color=""
269 if [ $detached = no ]; then
270 branch_color="$ok_color"
271 else
272 branch_color="$bad_color"
273 fi
274 c="$branch_color$c"
275
276 z="$c_clear$z"
277 if [ "$w" = "*" ]; then
278 w="$bad_color$w"
279 fi
280 if [ -n "$i" ]; then
281 i="$ok_color$i"
282 fi
283 if [ -n "$s" ]; then
284 s="$flags_color$s"
285 fi
286 if [ -n "$u" ]; then
287 u="$bad_color$u"
288 fi
289 r="$c_clear$r"
290 }
291
292 # Helper function to read the first line of a file into a variable.
293 # __git_eread requires 2 arguments, the file path and the name of the
294 # variable, in that order.
295 __git_eread ()
296 {
297 test -r "$1" && IFS=$'\r\n' read "$2" <"$1"
298 }
299
300 # see if a cherry-pick or revert is in progress, if the user has committed a
301 # conflict resolution with 'git commit' in the middle of a sequence of picks or
302 # reverts then CHERRY_PICK_HEAD/REVERT_HEAD will not exist so we have to read
303 # the todo file.
304 __git_sequencer_status ()
305 {
306 local todo
307 if test -f "$g/CHERRY_PICK_HEAD"
308 then
309 r="|CHERRY-PICKING"
310 return 0;
311 elif test -f "$g/REVERT_HEAD"
312 then
313 r="|REVERTING"
314 return 0;
315 elif __git_eread "$g/sequencer/todo" todo
316 then
317 case "$todo" in
318 p[\ \ ]|pick[\ \ ]*)
319 r="|CHERRY-PICKING"
320 return 0
321 ;;
322 revert[\ \ ]*)
323 r="|REVERTING"
324 return 0
325 ;;
326 esac
327 fi
328 return 1
329 }
330
331 # __git_ps1 accepts 0 or 1 arguments (i.e., format string)
332 # when called from PS1 using command substitution
333 # in this mode it prints text to add to bash PS1 prompt (includes branch name)
334 #
335 # __git_ps1 requires 2 or 3 arguments when called from PROMPT_COMMAND (pc)
336 # in that case it _sets_ PS1. The arguments are parts of a PS1 string.
337 # when two arguments are given, the first is prepended and the second appended
338 # to the state string when assigned to PS1.
339 # The optional third parameter will be used as printf format string to further
340 # customize the output of the git-status string.
341 # In this mode you can request colored hints using GIT_PS1_SHOWCOLORHINTS=true
342 __git_ps1 ()
343 {
344 # preserve exit status
345 local exit=$?
346 local pcmode=no
347 local detached=no
348 local ps1pc_start='\u@\h:\w '
349 local ps1pc_end='\$ '
350 local printf_format=' (%s)'
351
352 case "$#" in
353 2|3) pcmode=yes
354 ps1pc_start="$1"
355 ps1pc_end="$2"
356 printf_format="${3:-$printf_format}"
357 # set PS1 to a plain prompt so that we can
358 # simply return early if the prompt should not
359 # be decorated
360 PS1="$ps1pc_start$ps1pc_end"
361 ;;
362 0|1) printf_format="${1:-$printf_format}"
363 ;;
364 *) return $exit
365 ;;
366 esac
367
368 # ps1_expanded: This variable is set to 'yes' if the shell
369 # subjects the value of PS1 to parameter expansion:
370 #
371 # * bash does unless the promptvars option is disabled
372 # * zsh does not unless the PROMPT_SUBST option is set
373 # * POSIX shells always do
374 #
375 # If the shell would expand the contents of PS1 when drawing
376 # the prompt, a raw ref name must not be included in PS1.
377 # This protects the user from arbitrary code execution via
378 # specially crafted ref names. For example, a ref named
379 # 'refs/heads/$(IFS=_;cmd=sudo_rm_-rf_/;$cmd)' might cause the
380 # shell to execute 'sudo rm -rf /' when the prompt is drawn.
381 #
382 # Instead, the ref name should be placed in a separate global
383 # variable (in the __git_ps1_* namespace to avoid colliding
384 # with the user's environment) and that variable should be
385 # referenced from PS1. For example:
386 #
387 # __git_ps1_foo=$(do_something_to_get_ref_name)
388 # PS1="...stuff...\${__git_ps1_foo}...stuff..."
389 #
390 # If the shell does not expand the contents of PS1, the raw
391 # ref name must be included in PS1.
392 #
393 # The value of this variable is only relevant when in pcmode.
394 #
395 # Assume that the shell follows the POSIX specification and
396 # expands PS1 unless determined otherwise. (This is more
397 # likely to be correct if the user has a non-bash, non-zsh
398 # shell and safer than the alternative if the assumption is
399 # incorrect.)
400 #
401 local ps1_expanded=yes
402 [ -z "${ZSH_VERSION-}" ] || [[ -o PROMPT_SUBST ]] || ps1_expanded=no
403 [ -z "${BASH_VERSION-}" ] || shopt -q promptvars || ps1_expanded=no
404
405 local repo_info rev_parse_exit_code
406 repo_info="$(git rev-parse --git-dir --is-inside-git-dir \
407 --is-bare-repository --is-inside-work-tree \
408 --short HEAD 2>/dev/null)"
409 rev_parse_exit_code="$?"
410
411 if [ -z "$repo_info" ]; then
412 return $exit
413 fi
414
415 local short_sha=""
416 if [ "$rev_parse_exit_code" = "0" ]; then
417 short_sha="${repo_info##*$'\n'}"
418 repo_info="${repo_info%$'\n'*}"
419 fi
420 local inside_worktree="${repo_info##*$'\n'}"
421 repo_info="${repo_info%$'\n'*}"
422 local bare_repo="${repo_info##*$'\n'}"
423 repo_info="${repo_info%$'\n'*}"
424 local inside_gitdir="${repo_info##*$'\n'}"
425 local g="${repo_info%$'\n'*}"
426
427 if [ "true" = "$inside_worktree" ] &&
428 [ -n "${GIT_PS1_HIDE_IF_PWD_IGNORED-}" ] &&
429 [ "$(git config --bool bash.hideIfPwdIgnored)" != "false" ] &&
430 git check-ignore -q .
431 then
432 return $exit
433 fi
434
435 local sparse=""
436 if [ -z "${GIT_PS1_COMPRESSSPARSESTATE}" ] &&
437 [ -z "${GIT_PS1_OMITSPARSESTATE}" ] &&
438 [ "$(git config --bool core.sparseCheckout)" = "true" ]; then
439 sparse="|SPARSE"
440 fi
441
442 local r=""
443 local b=""
444 local step=""
445 local total=""
446 if [ -d "$g/rebase-merge" ]; then
447 __git_eread "$g/rebase-merge/head-name" b
448 __git_eread "$g/rebase-merge/msgnum" step
449 __git_eread "$g/rebase-merge/end" total
450 r="|REBASE"
451 else
452 if [ -d "$g/rebase-apply" ]; then
453 __git_eread "$g/rebase-apply/next" step
454 __git_eread "$g/rebase-apply/last" total
455 if [ -f "$g/rebase-apply/rebasing" ]; then
456 __git_eread "$g/rebase-apply/head-name" b
457 r="|REBASE"
458 elif [ -f "$g/rebase-apply/applying" ]; then
459 r="|AM"
460 else
461 r="|AM/REBASE"
462 fi
463 elif [ -f "$g/MERGE_HEAD" ]; then
464 r="|MERGING"
465 elif __git_sequencer_status; then
466 :
467 elif [ -f "$g/BISECT_LOG" ]; then
468 r="|BISECTING"
469 fi
470
471 if [ -n "$b" ]; then
472 :
473 elif [ -h "$g/HEAD" ]; then
474 # symlink symbolic ref
475 b="$(git symbolic-ref HEAD 2>/dev/null)"
476 else
477 local head=""
478 if ! __git_eread "$g/HEAD" head; then
479 return $exit
480 fi
481 # is it a symbolic ref?
482 b="${head#ref: }"
483 if [ "$head" = "$b" ]; then
484 detached=yes
485 b="$(
486 case "${GIT_PS1_DESCRIBE_STYLE-}" in
487 (contains)
488 git describe --contains HEAD ;;
489 (branch)
490 git describe --contains --all HEAD ;;
491 (tag)
492 git describe --tags HEAD ;;
493 (describe)
494 git describe HEAD ;;
495 (* | default)
496 git describe --tags --exact-match HEAD ;;
497 esac 2>/dev/null)" ||
498
499 b="$short_sha..."
500 b="($b)"
501 fi
502 fi
503 fi
504
505 if [ -n "$step" ] && [ -n "$total" ]; then
506 r="$r $step/$total"
507 fi
508
509 local w=""
510 local i=""
511 local s=""
512 local u=""
513 local h=""
514 local c=""
515 local p=""
516
517 if [ "true" = "$inside_gitdir" ]; then
518 if [ "true" = "$bare_repo" ]; then
519 c="BARE:"
520 else
521 b="GIT_DIR!"
522 fi
523 elif [ "true" = "$inside_worktree" ]; then
524 if [ -n "${GIT_PS1_SHOWDIRTYSTATE-}" ] &&
525 [ "$(git config --bool bash.showDirtyState)" != "false" ]
526 then
527 git diff --no-ext-diff --quiet || w="*"
528 git diff --no-ext-diff --cached --quiet || i="+"
529 if [ -z "$short_sha" ] && [ -z "$i" ]; then
530 i="#"
531 fi
532 fi
533 if [ -n "${GIT_PS1_SHOWSTASHSTATE-}" ] &&
534 git rev-parse --verify --quiet refs/stash >/dev/null
535 then
536 s="$"
537 fi
538
539 if [ -n "${GIT_PS1_SHOWUNTRACKEDFILES-}" ] &&
540 [ "$(git config --bool bash.showUntrackedFiles)" != "false" ] &&
541 git ls-files --others --exclude-standard --directory --no-empty-directory --error-unmatch -- ':/*' >/dev/null 2>/dev/null
542 then
543 u="%${ZSH_VERSION+%}"
544 fi
545
546 if [ -n "${GIT_PS1_COMPRESSSPARSESTATE}" ] &&
547 [ "$(git config --bool core.sparseCheckout)" = "true" ]; then
548 h="?"
549 fi
550
551 if [ -n "${GIT_PS1_SHOWUPSTREAM-}" ]; then
552 __git_ps1_show_upstream
553 fi
554 fi
555
556 local z="${GIT_PS1_STATESEPARATOR-" "}"
557
558 # NO color option unless in PROMPT_COMMAND mode or it's Zsh
559 if [ -n "${GIT_PS1_SHOWCOLORHINTS-}" ]; then
560 if [ $pcmode = yes ] || [ -n "${ZSH_VERSION-}" ]; then
561 __git_ps1_colorize_gitstring
562 fi
563 fi
564
565 b=${b##refs/heads/}
566 if [ $pcmode = yes ] && [ $ps1_expanded = yes ]; then
567 __git_ps1_branch_name=$b
568 b="\${__git_ps1_branch_name}"
569 fi
570
571 local f="$h$w$i$s$u"
572 local gitstring="$c$b${f:+$z$f}${sparse}$r$p"
573
574 if [ $pcmode = yes ]; then
575 if [ "${__git_printf_supports_v-}" != yes ]; then
576 gitstring=$(printf -- "$printf_format" "$gitstring")
577 else
578 printf -v gitstring -- "$printf_format" "$gitstring"
579 fi
580 PS1="$ps1pc_start$gitstring$ps1pc_end"
581 else
582 printf -- "$printf_format" "$gitstring"
583 fi
584
585 return $exit
586 }