unpack-trees: add a note about path invalidation
[git] / git-stash.sh
1 #!/bin/sh
2 # Copyright (c) 2007, Nanako Shiraishi
3
4 dashless=$(basename "$0" | sed -e 's/-/ /')
5 USAGE="list [<options>]
6    or: $dashless show [<stash>]
7    or: $dashless drop [-q|--quiet] [<stash>]
8    or: $dashless ( pop | apply ) [--index] [-q|--quiet] [<stash>]
9    or: $dashless branch <branchname> [<stash>]
10    or: $dashless save [--patch] [-k|--[no-]keep-index] [-q|--quiet]
11                       [-u|--include-untracked] [-a|--all] [<message>]
12    or: $dashless [push [--patch] [-k|--[no-]keep-index] [-q|--quiet]
13                        [-u|--include-untracked] [-a|--all] [-m <message>]
14                        [-- <pathspec>...]]
15    or: $dashless clear"
16
17 SUBDIRECTORY_OK=Yes
18 OPTIONS_SPEC=
19 START_DIR=$(pwd)
20 . git-sh-setup
21 require_work_tree
22 prefix=$(git rev-parse --show-prefix) || exit 1
23 cd_to_toplevel
24
25 TMP="$GIT_DIR/.git-stash.$$"
26 TMPindex=${GIT_INDEX_FILE-"$(git rev-parse --git-path index)"}.stash.$$
27 trap 'rm -f "$TMP-"* "$TMPindex"' 0
28
29 ref_stash=refs/stash
30
31 if git config --get-colorbool color.interactive; then
32        help_color="$(git config --get-color color.interactive.help 'red bold')"
33        reset_color="$(git config --get-color '' reset)"
34 else
35        help_color=
36        reset_color=
37 fi
38
39 no_changes () {
40         git diff-index --quiet --cached HEAD --ignore-submodules -- "$@" &&
41         git diff-files --quiet --ignore-submodules -- "$@" &&
42         (test -z "$untracked" || test -z "$(untracked_files "$@")")
43 }
44
45 untracked_files () {
46         if test "$1" = "-z"
47         then
48                 shift
49                 z=-z
50         else
51                 z=
52         fi
53         excl_opt=--exclude-standard
54         test "$untracked" = "all" && excl_opt=
55         git ls-files -o $z $excl_opt -- "$@"
56 }
57
58 clear_stash () {
59         if test $# != 0
60         then
61                 die "$(gettext "git stash clear with parameters is unimplemented")"
62         fi
63         if current=$(git rev-parse --verify --quiet $ref_stash)
64         then
65                 git update-ref -d $ref_stash $current
66         fi
67 }
68
69 create_stash () {
70         stash_msg=
71         untracked=
72         while test $# != 0
73         do
74                 case "$1" in
75                 -m|--message)
76                         shift
77                         stash_msg=${1?"BUG: create_stash () -m requires an argument"}
78                         ;;
79                 -m*)
80                         stash_msg=${1#-m}
81                         ;;
82                 --message=*)
83                         stash_msg=${1#--message=}
84                         ;;
85                 -u|--include-untracked)
86                         shift
87                         untracked=${1?"BUG: create_stash () -u requires an argument"}
88                         ;;
89                 --)
90                         shift
91                         break
92                         ;;
93                 esac
94                 shift
95         done
96
97         git update-index -q --refresh
98         if no_changes "$@"
99         then
100                 exit 0
101         fi
102
103         # state of the base commit
104         if b_commit=$(git rev-parse --verify HEAD)
105         then
106                 head=$(git rev-list --oneline -n 1 HEAD --)
107         else
108                 die "$(gettext "You do not have the initial commit yet")"
109         fi
110
111         if branch=$(git symbolic-ref -q HEAD)
112         then
113                 branch=${branch#refs/heads/}
114         else
115                 branch='(no branch)'
116         fi
117         msg=$(printf '%s: %s' "$branch" "$head")
118
119         # state of the index
120         i_tree=$(git write-tree) &&
121         i_commit=$(printf 'index on %s\n' "$msg" |
122                 git commit-tree $i_tree -p $b_commit) ||
123                 die "$(gettext "Cannot save the current index state")"
124
125         if test -n "$untracked"
126         then
127                 # Untracked files are stored by themselves in a parentless commit, for
128                 # ease of unpacking later.
129                 u_commit=$(
130                         untracked_files -z "$@" | (
131                                 GIT_INDEX_FILE="$TMPindex" &&
132                                 export GIT_INDEX_FILE &&
133                                 rm -f "$TMPindex" &&
134                                 git update-index -z --add --remove --stdin &&
135                                 u_tree=$(git write-tree) &&
136                                 printf 'untracked files on %s\n' "$msg" | git commit-tree $u_tree  &&
137                                 rm -f "$TMPindex"
138                 ) ) || die "$(gettext "Cannot save the untracked files")"
139
140                 untracked_commit_option="-p $u_commit";
141         else
142                 untracked_commit_option=
143         fi
144
145         if test -z "$patch_mode"
146         then
147
148                 # state of the working tree
149                 w_tree=$( (
150                         git read-tree --index-output="$TMPindex" -m $i_tree &&
151                         GIT_INDEX_FILE="$TMPindex" &&
152                         export GIT_INDEX_FILE &&
153                         git diff-index --name-only -z HEAD -- "$@" >"$TMP-stagenames" &&
154                         git update-index -z --add --remove --stdin <"$TMP-stagenames" &&
155                         git write-tree &&
156                         rm -f "$TMPindex"
157                 ) ) ||
158                         die "$(gettext "Cannot save the current worktree state")"
159
160         else
161
162                 rm -f "$TMP-index" &&
163                 GIT_INDEX_FILE="$TMP-index" git read-tree HEAD &&
164
165                 # find out what the user wants
166                 GIT_INDEX_FILE="$TMP-index" \
167                         git add--interactive --patch=stash -- "$@" &&
168
169                 # state of the working tree
170                 w_tree=$(GIT_INDEX_FILE="$TMP-index" git write-tree) ||
171                 die "$(gettext "Cannot save the current worktree state")"
172
173                 git diff-tree -p HEAD $w_tree -- >"$TMP-patch" &&
174                 test -s "$TMP-patch" ||
175                 die "$(gettext "No changes selected")"
176
177                 rm -f "$TMP-index" ||
178                 die "$(gettext "Cannot remove temporary index (can't happen)")"
179
180         fi
181
182         # create the stash
183         if test -z "$stash_msg"
184         then
185                 stash_msg=$(printf 'WIP on %s' "$msg")
186         else
187                 stash_msg=$(printf 'On %s: %s' "$branch" "$stash_msg")
188         fi
189         w_commit=$(printf '%s\n' "$stash_msg" |
190         git commit-tree $w_tree -p $b_commit -p $i_commit $untracked_commit_option) ||
191         die "$(gettext "Cannot record working tree state")"
192 }
193
194 store_stash () {
195         while test $# != 0
196         do
197                 case "$1" in
198                 -m|--message)
199                         shift
200                         stash_msg="$1"
201                         ;;
202                 -m*)
203                         stash_msg=${1#-m}
204                         ;;
205                 --message=*)
206                         stash_msg=${1#--message=}
207                         ;;
208                 -q|--quiet)
209                         quiet=t
210                         ;;
211                 *)
212                         break
213                         ;;
214                 esac
215                 shift
216         done
217         test $# = 1 ||
218         die "$(eval_gettext "\"$dashless store\" requires one <commit> argument")"
219
220         w_commit="$1"
221         if test -z "$stash_msg"
222         then
223                 stash_msg="Created via \"git stash store\"."
224         fi
225
226         git update-ref --create-reflog -m "$stash_msg" $ref_stash $w_commit
227         ret=$?
228         test $ret != 0 && test -z "$quiet" &&
229         die "$(eval_gettext "Cannot update \$ref_stash with \$w_commit")"
230         return $ret
231 }
232
233 push_stash () {
234         keep_index=
235         patch_mode=
236         untracked=
237         stash_msg=
238         while test $# != 0
239         do
240                 case "$1" in
241                 -k|--keep-index)
242                         keep_index=t
243                         ;;
244                 --no-keep-index)
245                         keep_index=n
246                         ;;
247                 -p|--patch)
248                         patch_mode=t
249                         # only default to keep if we don't already have an override
250                         test -z "$keep_index" && keep_index=t
251                         ;;
252                 -q|--quiet)
253                         GIT_QUIET=t
254                         ;;
255                 -u|--include-untracked)
256                         untracked=untracked
257                         ;;
258                 -a|--all)
259                         untracked=all
260                         ;;
261                 -m|--message)
262                         shift
263                         test -z ${1+x} && usage
264                         stash_msg=$1
265                         ;;
266                 -m*)
267                         stash_msg=${1#-m}
268                         ;;
269                 --message=*)
270                         stash_msg=${1#--message=}
271                         ;;
272                 --help)
273                         show_help
274                         ;;
275                 --)
276                         shift
277                         break
278                         ;;
279                 -*)
280                         option="$1"
281                         eval_gettextln "error: unknown option for 'stash push': \$option"
282                         usage
283                         ;;
284                 *)
285                         break
286                         ;;
287                 esac
288                 shift
289         done
290
291         eval "set $(git rev-parse --sq --prefix "$prefix" -- "$@")"
292
293         if test -n "$patch_mode" && test -n "$untracked"
294         then
295                 die "$(gettext "Can't use --patch and --include-untracked or --all at the same time")"
296         fi
297
298         test -n "$untracked" || git ls-files --error-unmatch -- "$@" >/dev/null || exit 1
299
300         git update-index -q --refresh
301         if no_changes "$@"
302         then
303                 say "$(gettext "No local changes to save")"
304                 exit 0
305         fi
306
307         git reflog exists $ref_stash ||
308                 clear_stash || die "$(gettext "Cannot initialize stash")"
309
310         create_stash -m "$stash_msg" -u "$untracked" -- "$@"
311         store_stash -m "$stash_msg" -q $w_commit ||
312         die "$(gettext "Cannot save the current status")"
313         say "$(eval_gettext "Saved working directory and index state \$stash_msg")"
314
315         if test -z "$patch_mode"
316         then
317                 test "$untracked" = "all" && CLEAN_X_OPTION=-x || CLEAN_X_OPTION=
318                 if test -n "$untracked" && test $# = 0
319                 then
320                         git clean --force --quiet -d $CLEAN_X_OPTION
321                 fi
322
323                 if test $# != 0
324                 then
325                         test -z "$untracked" && UPDATE_OPTION="-u" || UPDATE_OPTION=
326                         test "$untracked" = "all" && FORCE_OPTION="--force" || FORCE_OPTION=
327                         git add $UPDATE_OPTION $FORCE_OPTION -- "$@"
328                         git diff-index -p --cached --binary HEAD -- "$@" |
329                         git apply --index -R
330                 else
331                         git reset --hard -q
332                 fi
333
334                 if test "$keep_index" = "t" && test -n "$i_tree"
335                 then
336                         git read-tree --reset $i_tree
337                         git ls-files -z --modified -- "$@" |
338                         git checkout-index -z --force --stdin
339                 fi
340         else
341                 git apply -R < "$TMP-patch" ||
342                 die "$(gettext "Cannot remove worktree changes")"
343
344                 if test "$keep_index" != "t"
345                 then
346                         git reset -q -- "$@"
347                 fi
348         fi
349 }
350
351 save_stash () {
352         push_options=
353         while test $# != 0
354         do
355                 case "$1" in
356                 --)
357                         shift
358                         break
359                         ;;
360                 -*)
361                         # pass all options through to push_stash
362                         push_options="$push_options $1"
363                         ;;
364                 *)
365                         break
366                         ;;
367                 esac
368                 shift
369         done
370
371         stash_msg="$*"
372
373         if test -z "$stash_msg"
374         then
375                 push_stash $push_options
376         else
377                 push_stash $push_options -m "$stash_msg"
378         fi
379 }
380
381 have_stash () {
382         git rev-parse --verify --quiet $ref_stash >/dev/null
383 }
384
385 list_stash () {
386         have_stash || return 0
387         git log --format="%gd: %gs" -g --first-parent -m "$@" $ref_stash --
388 }
389
390 show_stash () {
391         ALLOW_UNKNOWN_FLAGS=t
392         assert_stash_like "$@"
393
394         if test -z "$FLAGS"
395         then
396                 if test "$(git config --bool stash.showStat || echo true)" = "true"
397                 then
398                         FLAGS=--stat
399                 fi
400
401                 if test "$(git config --bool stash.showPatch || echo false)" = "true"
402                 then
403                         FLAGS=${FLAGS}${FLAGS:+ }-p
404                 fi
405
406                 if test -z "$FLAGS"
407                 then
408                         return 0
409                 fi
410         fi
411
412         git diff ${FLAGS} $b_commit $w_commit
413 }
414
415 show_help () {
416         exec git help stash
417         exit 1
418 }
419
420 #
421 # Parses the remaining options looking for flags and
422 # at most one revision defaulting to ${ref_stash}@{0}
423 # if none found.
424 #
425 # Derives related tree and commit objects from the
426 # revision, if one is found.
427 #
428 # stash records the work tree, and is a merge between the
429 # base commit (first parent) and the index tree (second parent).
430 #
431 #   REV is set to the symbolic version of the specified stash-like commit
432 #   IS_STASH_LIKE is non-blank if ${REV} looks like a stash
433 #   IS_STASH_REF is non-blank if the ${REV} looks like a stash ref
434 #   s is set to the SHA1 of the stash commit
435 #   w_commit is set to the commit containing the working tree
436 #   b_commit is set to the base commit
437 #   i_commit is set to the commit containing the index tree
438 #   u_commit is set to the commit containing the untracked files tree
439 #   w_tree is set to the working tree
440 #   b_tree is set to the base tree
441 #   i_tree is set to the index tree
442 #   u_tree is set to the untracked files tree
443 #
444 #   GIT_QUIET is set to t if -q is specified
445 #   INDEX_OPTION is set to --index if --index is specified.
446 #   FLAGS is set to the remaining flags (if allowed)
447 #
448 # dies if:
449 #   * too many revisions specified
450 #   * no revision is specified and there is no stash stack
451 #   * a revision is specified which cannot be resolve to a SHA1
452 #   * a non-existent stash reference is specified
453 #   * unknown flags were set and ALLOW_UNKNOWN_FLAGS is not "t"
454 #
455
456 parse_flags_and_rev()
457 {
458         test "$PARSE_CACHE" = "$*" && return 0 # optimisation
459         PARSE_CACHE="$*"
460
461         IS_STASH_LIKE=
462         IS_STASH_REF=
463         INDEX_OPTION=
464         s=
465         w_commit=
466         b_commit=
467         i_commit=
468         u_commit=
469         w_tree=
470         b_tree=
471         i_tree=
472         u_tree=
473
474         FLAGS=
475         REV=
476         for opt
477         do
478                 case "$opt" in
479                         -q|--quiet)
480                                 GIT_QUIET=-t
481                         ;;
482                         --index)
483                                 INDEX_OPTION=--index
484                         ;;
485                         --help)
486                                 show_help
487                         ;;
488                         -*)
489                                 test "$ALLOW_UNKNOWN_FLAGS" = t ||
490                                         die "$(eval_gettext "unknown option: \$opt")"
491                                 FLAGS="${FLAGS}${FLAGS:+ }$opt"
492                         ;;
493                         *)
494                                 REV="${REV}${REV:+ }'$opt'"
495                         ;;
496                 esac
497         done
498
499         eval set -- $REV
500
501         case $# in
502                 0)
503                         have_stash || die "$(gettext "No stash entries found.")"
504                         set -- ${ref_stash}@{0}
505                 ;;
506                 1)
507                         :
508                 ;;
509                 *)
510                         die "$(eval_gettext "Too many revisions specified: \$REV")"
511                 ;;
512         esac
513
514         case "$1" in
515                 *[!0-9]*)
516                         :
517                 ;;
518                 *)
519                         set -- "${ref_stash}@{$1}"
520                 ;;
521         esac
522
523         REV=$(git rev-parse --symbolic --verify --quiet "$1") || {
524                 reference="$1"
525                 die "$(eval_gettext "\$reference is not a valid reference")"
526         }
527
528         i_commit=$(git rev-parse --verify --quiet "$REV^2") &&
529         set -- $(git rev-parse "$REV" "$REV^1" "$REV:" "$REV^1:" "$REV^2:" 2>/dev/null) &&
530         s=$1 &&
531         w_commit=$1 &&
532         b_commit=$2 &&
533         w_tree=$3 &&
534         b_tree=$4 &&
535         i_tree=$5 &&
536         IS_STASH_LIKE=t &&
537         test "$ref_stash" = "$(git rev-parse --symbolic-full-name "${REV%@*}")" &&
538         IS_STASH_REF=t
539
540         u_commit=$(git rev-parse --verify --quiet "$REV^3") &&
541         u_tree=$(git rev-parse "$REV^3:" 2>/dev/null)
542 }
543
544 is_stash_like()
545 {
546         parse_flags_and_rev "$@"
547         test -n "$IS_STASH_LIKE"
548 }
549
550 assert_stash_like() {
551         is_stash_like "$@" || {
552                 args="$*"
553                 die "$(eval_gettext "'\$args' is not a stash-like commit")"
554         }
555 }
556
557 is_stash_ref() {
558         is_stash_like "$@" && test -n "$IS_STASH_REF"
559 }
560
561 assert_stash_ref() {
562         is_stash_ref "$@" || {
563                 args="$*"
564                 die "$(eval_gettext "'\$args' is not a stash reference")"
565         }
566 }
567
568 apply_stash () {
569
570         assert_stash_like "$@"
571
572         git update-index -q --refresh || die "$(gettext "unable to refresh index")"
573
574         # current index state
575         c_tree=$(git write-tree) ||
576                 die "$(gettext "Cannot apply a stash in the middle of a merge")"
577
578         unstashed_index_tree=
579         if test -n "$INDEX_OPTION" && test "$b_tree" != "$i_tree" &&
580                         test "$c_tree" != "$i_tree"
581         then
582                 git diff-tree --binary $s^2^..$s^2 | git apply --cached
583                 test $? -ne 0 &&
584                         die "$(gettext "Conflicts in index. Try without --index.")"
585                 unstashed_index_tree=$(git write-tree) ||
586                         die "$(gettext "Could not save index tree")"
587                 git reset
588         fi
589
590         if test -n "$u_tree"
591         then
592                 GIT_INDEX_FILE="$TMPindex" git read-tree "$u_tree" &&
593                 GIT_INDEX_FILE="$TMPindex" git checkout-index --all &&
594                 rm -f "$TMPindex" ||
595                 die "$(gettext "Could not restore untracked files from stash entry")"
596         fi
597
598         eval "
599                 GITHEAD_$w_tree='Stashed changes' &&
600                 GITHEAD_$c_tree='Updated upstream' &&
601                 GITHEAD_$b_tree='Version stash was based on' &&
602                 export GITHEAD_$w_tree GITHEAD_$c_tree GITHEAD_$b_tree
603         "
604
605         if test -n "$GIT_QUIET"
606         then
607                 GIT_MERGE_VERBOSITY=0 && export GIT_MERGE_VERBOSITY
608         fi
609         if git merge-recursive $b_tree -- $c_tree $w_tree
610         then
611                 # No conflict
612                 if test -n "$unstashed_index_tree"
613                 then
614                         git read-tree "$unstashed_index_tree"
615                 else
616                         a="$TMP-added" &&
617                         git diff-index --cached --name-only --diff-filter=A $c_tree >"$a" &&
618                         git read-tree --reset $c_tree &&
619                         git update-index --add --stdin <"$a" ||
620                                 die "$(gettext "Cannot unstage modified files")"
621                         rm -f "$a"
622                 fi
623                 squelch=
624                 if test -n "$GIT_QUIET"
625                 then
626                         squelch='>/dev/null 2>&1'
627                 fi
628                 (cd "$START_DIR" && eval "git status $squelch") || :
629         else
630                 # Merge conflict; keep the exit status from merge-recursive
631                 status=$?
632                 git rerere
633                 if test -n "$INDEX_OPTION"
634                 then
635                         gettextln "Index was not unstashed." >&2
636                 fi
637                 exit $status
638         fi
639 }
640
641 pop_stash() {
642         assert_stash_ref "$@"
643
644         if apply_stash "$@"
645         then
646                 drop_stash "$@"
647         else
648                 status=$?
649                 say "$(gettext "The stash entry is kept in case you need it again.")"
650                 exit $status
651         fi
652 }
653
654 drop_stash () {
655         assert_stash_ref "$@"
656
657         git reflog delete --updateref --rewrite "${REV}" &&
658                 say "$(eval_gettext "Dropped \${REV} (\$s)")" ||
659                 die "$(eval_gettext "\${REV}: Could not drop stash entry")"
660
661         # clear_stash if we just dropped the last stash entry
662         git rev-parse --verify --quiet "$ref_stash@{0}" >/dev/null ||
663         clear_stash
664 }
665
666 apply_to_branch () {
667         test -n "$1" || die "$(gettext "No branch name specified")"
668         branch=$1
669         shift 1
670
671         set -- --index "$@"
672         assert_stash_like "$@"
673
674         git checkout -b $branch $REV^ &&
675         apply_stash "$@" && {
676                 test -z "$IS_STASH_REF" || drop_stash "$@"
677         }
678 }
679
680 test "$1" = "-p" && set "push" "$@"
681
682 PARSE_CACHE='--not-parsed'
683 # The default command is "push" if nothing but options are given
684 seen_non_option=
685 for opt
686 do
687         case "$opt" in
688         --) break ;;
689         -*) ;;
690         *) seen_non_option=t; break ;;
691         esac
692 done
693
694 test -n "$seen_non_option" || set "push" "$@"
695
696 # Main command set
697 case "$1" in
698 list)
699         shift
700         list_stash "$@"
701         ;;
702 show)
703         shift
704         show_stash "$@"
705         ;;
706 save)
707         shift
708         save_stash "$@"
709         ;;
710 push)
711         shift
712         push_stash "$@"
713         ;;
714 apply)
715         shift
716         apply_stash "$@"
717         ;;
718 clear)
719         shift
720         clear_stash "$@"
721         ;;
722 create)
723         shift
724         create_stash -m "$*" && echo "$w_commit"
725         ;;
726 store)
727         shift
728         store_stash "$@"
729         ;;
730 drop)
731         shift
732         drop_stash "$@"
733         ;;
734 pop)
735         shift
736         pop_stash "$@"
737         ;;
738 branch)
739         shift
740         apply_to_branch "$@"
741         ;;
742 *)
743         case $# in
744         0)
745                 push_stash &&
746                 say "$(gettext "(To restore them type \"git stash apply\")")"
747                 ;;
748         *)
749                 usage
750         esac
751         ;;
752 esac