Merge branch 'pw/p4'
[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] [<message>]]
11    or: $dashless clear"
12
13 SUBDIRECTORY_OK=Yes
14 OPTIONS_SPEC=
15 . git-sh-setup
16 require_work_tree
17 cd_to_toplevel
18
19 TMP="$GIT_DIR/.git-stash.$$"
20 TMPindex=${GIT_INDEX_FILE-"$GIT_DIR/index"}.stash.$$
21 trap 'rm -f "$TMP-"* "$TMPindex"' 0
22
23 ref_stash=refs/stash
24
25 if git config --get-colorbool color.interactive; then
26        help_color="$(git config --get-color color.interactive.help 'red bold')"
27        reset_color="$(git config --get-color '' reset)"
28 else
29        help_color=
30        reset_color=
31 fi
32
33 no_changes () {
34         git diff-index --quiet --cached HEAD --ignore-submodules -- &&
35         git diff-files --quiet --ignore-submodules
36 }
37
38 clear_stash () {
39         if test $# != 0
40         then
41                 die "git stash clear with parameters is unimplemented"
42         fi
43         if current=$(git rev-parse --verify $ref_stash 2>/dev/null)
44         then
45                 git update-ref -d $ref_stash $current
46         fi
47 }
48
49 create_stash () {
50         stash_msg="$1"
51
52         git update-index -q --refresh
53         if no_changes
54         then
55                 exit 0
56         fi
57
58         # state of the base commit
59         if b_commit=$(git rev-parse --verify HEAD)
60         then
61                 head=$(git rev-list --oneline -n 1 HEAD --)
62         else
63                 die "You do not have the initial commit yet"
64         fi
65
66         if branch=$(git symbolic-ref -q HEAD)
67         then
68                 branch=${branch#refs/heads/}
69         else
70                 branch='(no branch)'
71         fi
72         msg=$(printf '%s: %s' "$branch" "$head")
73
74         # state of the index
75         i_tree=$(git write-tree) &&
76         i_commit=$(printf 'index on %s\n' "$msg" |
77                 git commit-tree $i_tree -p $b_commit) ||
78                 die "Cannot save the current index state"
79
80         if test -z "$patch_mode"
81         then
82
83                 # state of the working tree
84                 w_tree=$( (
85                         git read-tree --index-output="$TMPindex" -m $i_tree &&
86                         GIT_INDEX_FILE="$TMPindex" &&
87                         export GIT_INDEX_FILE &&
88                         git diff --name-only -z HEAD | git update-index -z --add --remove --stdin &&
89                         git write-tree &&
90                         rm -f "$TMPindex"
91                 ) ) ||
92                         die "Cannot save the current worktree state"
93
94         else
95
96                 rm -f "$TMP-index" &&
97                 GIT_INDEX_FILE="$TMP-index" git read-tree HEAD &&
98
99                 # find out what the user wants
100                 GIT_INDEX_FILE="$TMP-index" \
101                         git add--interactive --patch=stash -- &&
102
103                 # state of the working tree
104                 w_tree=$(GIT_INDEX_FILE="$TMP-index" git write-tree) ||
105                 die "Cannot save the current worktree state"
106
107                 git diff-tree -p HEAD $w_tree > "$TMP-patch" &&
108                 test -s "$TMP-patch" ||
109                 die "No changes selected"
110
111                 rm -f "$TMP-index" ||
112                 die "Cannot remove temporary index (can't happen)"
113
114         fi
115
116         # create the stash
117         if test -z "$stash_msg"
118         then
119                 stash_msg=$(printf 'WIP on %s' "$msg")
120         else
121                 stash_msg=$(printf 'On %s: %s' "$branch" "$stash_msg")
122         fi
123         w_commit=$(printf '%s\n' "$stash_msg" |
124                 git commit-tree $w_tree -p $b_commit -p $i_commit) ||
125                 die "Cannot record working tree state"
126 }
127
128 save_stash () {
129         keep_index=
130         patch_mode=
131         while test $# != 0
132         do
133                 case "$1" in
134                 -k|--keep-index)
135                         keep_index=t
136                         ;;
137                 --no-keep-index)
138                         keep_index=
139                         ;;
140                 -p|--patch)
141                         patch_mode=t
142                         keep_index=t
143                         ;;
144                 -q|--quiet)
145                         GIT_QUIET=t
146                         ;;
147                 --)
148                         shift
149                         break
150                         ;;
151                 -*)
152                         echo "error: unknown option for 'stash save': $1"
153                         echo "       To provide a message, use git stash save -- '$1'"
154                         usage
155                         ;;
156                 *)
157                         break
158                         ;;
159                 esac
160                 shift
161         done
162
163         stash_msg="$*"
164
165         git update-index -q --refresh
166         if no_changes
167         then
168                 say 'No local changes to save'
169                 exit 0
170         fi
171         test -f "$GIT_DIR/logs/$ref_stash" ||
172                 clear_stash || die "Cannot initialize stash"
173
174         create_stash "$stash_msg"
175
176         # Make sure the reflog for stash is kept.
177         : >>"$GIT_DIR/logs/$ref_stash"
178
179         git update-ref -m "$stash_msg" $ref_stash $w_commit ||
180                 die "Cannot save the current status"
181         say Saved working directory and index state "$stash_msg"
182
183         if test -z "$patch_mode"
184         then
185                 git reset --hard ${GIT_QUIET:+-q}
186
187                 if test -n "$keep_index" && test -n $i_tree
188                 then
189                         git read-tree --reset -u $i_tree
190                 fi
191         else
192                 git apply -R < "$TMP-patch" ||
193                 die "Cannot remove worktree changes"
194
195                 if test -z "$keep_index"
196                 then
197                         git reset
198                 fi
199         fi
200 }
201
202 have_stash () {
203         git rev-parse --verify $ref_stash >/dev/null 2>&1
204 }
205
206 list_stash () {
207         have_stash || return 0
208         git log --format="%gd: %gs" -g "$@" $ref_stash --
209 }
210
211 show_stash () {
212         assert_stash_like "$@"
213
214         git diff ${FLAGS:---stat} $b_commit $w_commit
215 }
216
217 #
218 # Parses the remaining options looking for flags and
219 # at most one revision defaulting to ${ref_stash}@{0}
220 # if none found.
221 #
222 # Derives related tree and commit objects from the
223 # revision, if one is found.
224 #
225 # stash records the work tree, and is a merge between the
226 # base commit (first parent) and the index tree (second parent).
227 #
228 #   REV is set to the symbolic version of the specified stash-like commit
229 #   IS_STASH_LIKE is non-blank if ${REV} looks like a stash
230 #   IS_STASH_REF is non-blank if the ${REV} looks like a stash ref
231 #   s is set to the SHA1 of the stash commit
232 #   w_commit is set to the commit containing the working tree
233 #   b_commit is set to the base commit
234 #   i_commit is set to the commit containing the index tree
235 #   w_tree is set to the working tree
236 #   b_tree is set to the base tree
237 #   i_tree is set to the index tree
238 #
239 #   GIT_QUIET is set to t if -q is specified
240 #   INDEX_OPTION is set to --index if --index is specified.
241 #   FLAGS is set to the remaining flags
242 #
243 # dies if:
244 #   * too many revisions specified
245 #   * no revision is specified and there is no stash stack
246 #   * a revision is specified which cannot be resolve to a SHA1
247 #   * a non-existent stash reference is specified
248 #
249
250 parse_flags_and_rev()
251 {
252         test "$PARSE_CACHE" = "$*" && return 0 # optimisation
253         PARSE_CACHE="$*"
254
255         IS_STASH_LIKE=
256         IS_STASH_REF=
257         INDEX_OPTION=
258         s=
259         w_commit=
260         b_commit=
261         i_commit=
262         w_tree=
263         b_tree=
264         i_tree=
265
266         REV=$(git rev-parse --no-flags --symbolic "$@" 2>/dev/null)
267
268         FLAGS=
269         for opt
270         do
271                 case "$opt" in
272                         -q|--quiet)
273                                 GIT_QUIET=-t
274                         ;;
275                         --index)
276                                 INDEX_OPTION=--index
277                         ;;
278                         -*)
279                                 FLAGS="${FLAGS}${FLAGS:+ }$opt"
280                         ;;
281                 esac
282         done
283
284         set -- $REV
285
286         case $# in
287                 0)
288                         have_stash || die "No stash found."
289                         set -- ${ref_stash}@{0}
290                 ;;
291                 1)
292                         :
293                 ;;
294                 *)
295                         die "Too many revisions specified: $REV"
296                 ;;
297         esac
298
299         REV=$(git rev-parse --quiet --symbolic --verify $1 2>/dev/null) || die "$1 is not valid reference"
300
301         i_commit=$(git rev-parse --quiet --verify $REV^2 2>/dev/null) &&
302         set -- $(git rev-parse $REV $REV^1 $REV: $REV^1: $REV^2: 2>/dev/null) &&
303         s=$1 &&
304         w_commit=$1 &&
305         b_commit=$2 &&
306         w_tree=$3 &&
307         b_tree=$4 &&
308         i_tree=$5 &&
309         IS_STASH_LIKE=t &&
310         test "$ref_stash" = "$(git rev-parse --symbolic-full-name "${REV%@*}")" &&
311         IS_STASH_REF=t
312
313         if test "${REV}" != "${REV%{*\}}"
314         then
315                 # maintainers: it would be better if git rev-parse indicated
316                 # this condition with a non-zero status code but as of 1.7.2.1 it
317                 # it did not. So, we use non-empty stderr output as a proxy for the
318                 # condition of interest.
319                 test -z "$(git rev-parse "$REV" 2>&1 >/dev/null)" || die "$REV does not exist in the stash log"
320         fi
321
322 }
323
324 is_stash_like()
325 {
326         parse_flags_and_rev "$@"
327         test -n "$IS_STASH_LIKE"
328 }
329
330 assert_stash_like() {
331         is_stash_like "$@" || die "'$*' is not a stash-like commit"
332 }
333
334 is_stash_ref() {
335         is_stash_like "$@" && test -n "$IS_STASH_REF"
336 }
337
338 assert_stash_ref() {
339         is_stash_ref "$@" || die "'$*' is not a stash reference"
340 }
341
342 apply_stash () {
343
344         assert_stash_like "$@"
345
346         git update-index -q --refresh &&
347         git diff-files --quiet --ignore-submodules ||
348                 die 'Cannot apply to a dirty working tree, please stage your changes'
349
350         # current index state
351         c_tree=$(git write-tree) ||
352                 die 'Cannot apply a stash in the middle of a merge'
353
354         unstashed_index_tree=
355         if test -n "$INDEX_OPTION" && test "$b_tree" != "$i_tree" &&
356                         test "$c_tree" != "$i_tree"
357         then
358                 git diff-tree --binary $s^2^..$s^2 | git apply --cached
359                 test $? -ne 0 &&
360                         die 'Conflicts in index. Try without --index.'
361                 unstashed_index_tree=$(git write-tree) ||
362                         die 'Could not save index tree'
363                 git reset
364         fi
365
366         eval "
367                 GITHEAD_$w_tree='Stashed changes' &&
368                 GITHEAD_$c_tree='Updated upstream' &&
369                 GITHEAD_$b_tree='Version stash was based on' &&
370                 export GITHEAD_$w_tree GITHEAD_$c_tree GITHEAD_$b_tree
371         "
372
373         if test -n "$GIT_QUIET"
374         then
375                 GIT_MERGE_VERBOSITY=0 && export GIT_MERGE_VERBOSITY
376         fi
377         if git merge-recursive $b_tree -- $c_tree $w_tree
378         then
379                 # No conflict
380                 if test -n "$unstashed_index_tree"
381                 then
382                         git read-tree "$unstashed_index_tree"
383                 else
384                         a="$TMP-added" &&
385                         git diff-index --cached --name-only --diff-filter=A $c_tree >"$a" &&
386                         git read-tree --reset $c_tree &&
387                         git update-index --add --stdin <"$a" ||
388                                 die "Cannot unstage modified files"
389                         rm -f "$a"
390                 fi
391                 squelch=
392                 if test -n "$GIT_QUIET"
393                 then
394                         squelch='>/dev/null 2>&1'
395                 fi
396                 eval "git status $squelch" || :
397         else
398                 # Merge conflict; keep the exit status from merge-recursive
399                 status=$?
400                 if test -n "$INDEX_OPTION"
401                 then
402                         echo >&2 'Index was not unstashed.'
403                 fi
404                 exit $status
405         fi
406 }
407
408 pop_stash() {
409         assert_stash_ref "$@"
410
411         apply_stash "$@" &&
412         drop_stash "$@"
413 }
414
415 drop_stash () {
416         assert_stash_ref "$@"
417
418         git reflog delete --updateref --rewrite "${REV}" &&
419                 say "Dropped ${REV} ($s)" || die "${REV}: Could not drop stash entry"
420
421         # clear_stash if we just dropped the last stash entry
422         git rev-parse --verify "$ref_stash@{0}" > /dev/null 2>&1 || clear_stash
423 }
424
425 apply_to_branch () {
426         test -n "$1" || die 'No branch name specified'
427         branch=$1
428         shift 1
429
430         set -- --index "$@"
431         assert_stash_like "$@"
432
433         git checkout -b $branch $REV^ &&
434         apply_stash "$@" && {
435                 test -z "$IS_STASH_REF" || drop_stash "$@"
436         }
437 }
438
439 PARSE_CACHE='--not-parsed'
440 # The default command is "save" if nothing but options are given
441 seen_non_option=
442 for opt
443 do
444         case "$opt" in
445         -*) ;;
446         *) seen_non_option=t; break ;;
447         esac
448 done
449
450 test -n "$seen_non_option" || set "save" "$@"
451
452 # Main command set
453 case "$1" in
454 list)
455         shift
456         list_stash "$@"
457         ;;
458 show)
459         shift
460         show_stash "$@"
461         ;;
462 save)
463         shift
464         save_stash "$@"
465         ;;
466 apply)
467         shift
468         apply_stash "$@"
469         ;;
470 clear)
471         shift
472         clear_stash "$@"
473         ;;
474 create)
475         if test $# -gt 0 && test "$1" = create
476         then
477                 shift
478         fi
479         create_stash "$*" && echo "$w_commit"
480         ;;
481 drop)
482         shift
483         drop_stash "$@"
484         ;;
485 pop)
486         shift
487         pop_stash "$@"
488         ;;
489 branch)
490         shift
491         apply_to_branch "$@"
492         ;;
493 *)
494         case $# in
495         0)
496                 save_stash &&
497                 say '(To restore them type "git stash apply")'
498                 ;;
499         *)
500                 usage
501         esac
502         ;;
503 esac