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 [-k|--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 trap 'rm -f "$TMP-*"' 0
  21
  22 ref_stash=refs/stash
  23
  24 if git config --get-colorbool color.interactive; then
  25        help_color="$(git config --get-color color.interactive.help 'red bold')"
  26        reset_color="$(git config --get-color '' reset)"
  27 else
  28        help_color=
  29        reset_color=
  30 fi
  31
  32 no_changes () {
  33         git diff-index --quiet --cached HEAD --ignore-submodules -- &&
  34         git diff-files --quiet --ignore-submodules
  35 }
  36
  37 clear_stash () {
  38         if test $# != 0
  39         then
  40                 die "git stash clear with parameters is unimplemented"
  41         fi
  42         if current=$(git rev-parse --verify $ref_stash 2>/dev/null)
  43         then
  44                 git update-ref -d $ref_stash $current
  45         fi
  46 }
  47
  48 create_stash () {
  49         stash_msg="$1"
  50
  51         git update-index -q --refresh
  52         if no_changes
  53         then
  54                 exit 0
  55         fi
  56
  57         # state of the base commit
  58         if b_commit=$(git rev-parse --verify HEAD)
  59         then
  60                 head=$(git log --no-color --abbrev-commit --pretty=oneline -n 1 HEAD --)
  61         else
  62                 die "You do not have the initial commit yet"
  63         fi
  64
  65         if branch=$(git symbolic-ref -q HEAD)
  66         then
  67                 branch=${branch#refs/heads/}
  68         else
  69                 branch='(no branch)'
  70         fi
  71         msg=$(printf '%s: %s' "$branch" "$head")
  72
  73         # state of the index
  74         i_tree=$(git write-tree) &&
  75         i_commit=$(printf 'index on %s\n' "$msg" |
  76                 git commit-tree $i_tree -p $b_commit) ||
  77                 die "Cannot save the current index state"
  78
  79         if test -z "$patch_mode"
  80         then
  81
  82                 # state of the working tree
  83                 w_tree=$( (
  84                         rm -f "$TMP-index" &&
  85                         cp -p ${GIT_INDEX_FILE-"$GIT_DIR/index"} "$TMP-index" &&
  86                         GIT_INDEX_FILE="$TMP-index" &&
  87                         export GIT_INDEX_FILE &&
  88                         git read-tree -m $i_tree &&
  89                         git add -u &&
  90                         git write-tree &&
  91                         rm -f "$TMP-index"
  92                 ) ) ||
  93                         die "Cannot save the current worktree state"
  94
  95         else
  96
  97                 rm -f "$TMP-index" &&
  98                 GIT_INDEX_FILE="$TMP-index" git read-tree HEAD &&
  99
 100                 # find out what the user wants
 101                 GIT_INDEX_FILE="$TMP-index" \
 102                         git add--interactive --patch=stash -- &&
 103
 104                 # state of the working tree
 105                 w_tree=$(GIT_INDEX_FILE="$TMP-index" git write-tree) ||
 106                 die "Cannot save the current worktree state"
 107
 108                 git diff-tree -p HEAD $w_tree > "$TMP-patch" &&
 109                 test -s "$TMP-patch" ||
 110                 die "No changes selected"
 111
 112                 rm -f "$TMP-index" ||
 113                 die "Cannot remove temporary index (can't happen)"
 114
 115         fi
 116
 117         # create the stash
 118         if test -z "$stash_msg"
 119         then
 120                 stash_msg=$(printf 'WIP on %s' "$msg")
 121         else
 122                 stash_msg=$(printf 'On %s: %s' "$branch" "$stash_msg")
 123         fi
 124         w_commit=$(printf '%s\n' "$stash_msg" |
 125                 git commit-tree $w_tree -p $b_commit -p $i_commit) ||
 126                 die "Cannot record working tree state"
 127 }
 128
 129 save_stash () {
 130         keep_index=
 131         patch_mode=
 132         while test $# != 0
 133         do
 134                 case "$1" in
 135                 -k|--keep-index)
 136                         keep_index=t
 137                         ;;
 138                 --no-keep-index)
 139                         keep_index=
 140                         ;;
 141                 -p|--patch)
 142                         patch_mode=t
 143                         keep_index=t
 144                         ;;
 145                 -q|--quiet)
 146                         GIT_QUIET=t
 147                         ;;
 148                 --)
 149                         shift
 150                         break
 151                         ;;
 152                 -*)
 153                         echo "error: unknown option for '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 $ref_stash >/dev/null 2>&1
 204 }
 205
 206 list_stash () {
 207         have_stash || return 0
 208         git log --no-color --pretty=oneline -g "$@" $ref_stash -- |
 209         sed -n -e 's/^[.0-9a-f]* refs\///p'
 210 }
 211
 212 show_stash () {
 213         flags=$(git rev-parse --no-revs --flags "$@")
 214         if test -z "$flags"
 215         then
 216                 flags=--stat
 217         fi
 218
 219         w_commit=$(git rev-parse --verify --default $ref_stash "$@") &&
 220         b_commit=$(git rev-parse --verify "$w_commit^") &&
 221         git diff $flags $b_commit $w_commit
 222 }
 223
 224 apply_stash () {
 225         unstash_index=
 226
 227         while test $# != 0
 228         do
 229                 case "$1" in
 230                 --index)
 231                         unstash_index=t
 232                         ;;
 233                 -q|--quiet)
 234                         GIT_QUIET=t
 235                         ;;
 236                 *)
 237                         break
 238                         ;;
 239                 esac
 240                 shift
 241         done
 242
 243         if test $# = 0
 244         then
 245                 have_stash || die 'Nothing to apply'
 246         fi
 247
 248         # stash records the work tree, and is a merge between the
 249         # base commit (first parent) and the index tree (second parent).
 250         s=$(git rev-parse --quiet --verify --default $ref_stash "$@") &&
 251         w_tree=$(git rev-parse --quiet --verify "$s:") &&
 252         b_tree=$(git rev-parse --quiet --verify "$s^1:") &&
 253         i_tree=$(git rev-parse --quiet --verify "$s^2:") ||
 254                 die "$*: no valid stashed state found"
 255
 256         git update-index -q --refresh &&
 257         git diff-files --quiet --ignore-submodules ||
 258                 die 'Cannot apply to a dirty working tree, please stage your changes'
 259
 260         # current index state
 261         c_tree=$(git write-tree) ||
 262                 die 'Cannot apply a stash in the middle of a merge'
 263
 264         unstashed_index_tree=
 265         if test -n "$unstash_index" && test "$b_tree" != "$i_tree" &&
 266                         test "$c_tree" != "$i_tree"
 267         then
 268                 git diff-tree --binary $s^2^..$s^2 | git apply --cached
 269                 test $? -ne 0 &&
 270                         die 'Conflicts in index. Try without --index.'
 271                 unstashed_index_tree=$(git write-tree) ||
 272                         die 'Could not save index tree'
 273                 git reset
 274         fi
 275
 276         eval "
 277                 GITHEAD_$w_tree='Stashed changes' &&
 278                 GITHEAD_$c_tree='Updated upstream' &&
 279                 GITHEAD_$b_tree='Version stash was based on' &&
 280                 export GITHEAD_$w_tree GITHEAD_$c_tree GITHEAD_$b_tree
 281         "
 282
 283         if test -n "$GIT_QUIET"
 284         then
 285                 export GIT_MERGE_VERBOSITY=0
 286         fi
 287         if git merge-recursive $b_tree -- $c_tree $w_tree
 288         then
 289                 # No conflict
 290                 if test -n "$unstashed_index_tree"
 291                 then
 292                         git read-tree "$unstashed_index_tree"
 293                 else
 294                         a="$TMP-added" &&
 295                         git diff-index --cached --name-only --diff-filter=A $c_tree >"$a" &&
 296                         git read-tree --reset $c_tree &&
 297                         git update-index --add --stdin <"$a" ||
 298                                 die "Cannot unstage modified files"
 299                         rm -f "$a"
 300                 fi
 301                 squelch=
 302                 if test -n "$GIT_QUIET"
 303                 then
 304                         squelch='>/dev/null 2>&1'
 305                 fi
 306                 eval "git status $squelch" || :
 307         else
 308                 # Merge conflict; keep the exit status from merge-recursive
 309                 status=$?
 310                 if test -n "$unstash_index"
 311                 then
 312                         echo >&2 'Index was not unstashed.'
 313                 fi
 314                 exit $status
 315         fi
 316 }
 317
 318 drop_stash () {
 319         have_stash || die 'No stash entries to drop'
 320
 321         while test $# != 0
 322         do
 323                 case "$1" in
 324                 -q|--quiet)
 325                         GIT_QUIET=t
 326                         ;;
 327                 *)
 328                         break
 329                         ;;
 330                 esac
 331                 shift
 332         done
 333
 334         if test $# = 0
 335         then
 336                 set x "$ref_stash@{0}"
 337                 shift
 338         fi
 339         # Verify supplied argument looks like a stash entry
 340         s=$(git rev-parse --verify "$@") &&
 341         git rev-parse --verify "$s:"   > /dev/null 2>&1 &&
 342         git rev-parse --verify "$s^1:" > /dev/null 2>&1 &&
 343         git rev-parse --verify "$s^2:" > /dev/null 2>&1 ||
 344                 die "$*: not a valid stashed state"
 345
 346         git reflog delete --updateref --rewrite "$@" &&
 347                 say "Dropped $* ($s)" || die "$*: Could not drop stash entry"
 348
 349         # clear_stash if we just dropped the last stash entry
 350         git rev-parse --verify "$ref_stash@{0}" > /dev/null 2>&1 || clear_stash
 351 }
 352
 353 apply_to_branch () {
 354         have_stash || die 'Nothing to apply'
 355
 356         test -n "$1" || die 'No branch name specified'
 357         branch=$1
 358
 359         if test -z "$2"
 360         then
 361                 set x "$ref_stash@{0}"
 362         fi
 363         stash=$2
 364
 365         git checkout -b $branch $stash^ &&
 366         apply_stash --index $stash &&
 367         drop_stash $stash
 368 }
 369
 370 # The default command is "save" if nothing but options are given
 371 seen_non_option=
 372 for opt
 373 do
 374         case "$opt" in
 375         -*) ;;
 376         *) seen_non_option=t; break ;;
 377         esac
 378 done
 379
 380 test -n "$seen_non_option" || set "save" "$@"
 381
 382 # Main command set
 383 case "$1" in
 384 list)
 385         shift
 386         if test $# = 0
 387         then
 388                 set x -n 10
 389                 shift
 390         fi
 391         list_stash "$@"
 392         ;;
 393 show)
 394         shift
 395         show_stash "$@"
 396         ;;
 397 save)
 398         shift
 399         save_stash "$@"
 400         ;;
 401 apply)
 402         shift
 403         apply_stash "$@"
 404         ;;
 405 clear)
 406         shift
 407         clear_stash "$@"
 408         ;;
 409 create)
 410         if test $# -gt 0 && test "$1" = create
 411         then
 412                 shift
 413         fi
 414         create_stash "$*" && echo "$w_commit"
 415         ;;
 416 drop)
 417         shift
 418         drop_stash "$@"
 419         ;;
 420 pop)
 421         shift
 422         if apply_stash "$@"
 423         then
 424                 test -z "$unstash_index" || shift
 425                 drop_stash "$@"
 426         fi
 427         ;;
 428 branch)
 429         shift
 430         apply_to_branch "$@"
 431         ;;
 432 *)
 433         case $# in
 434         0)
 435                 save_stash &&
 436                 say '(To restore them type "git stash apply")'
 437                 ;;
 438         *)
 439                 usage
 440         esac
 441         ;;
 442 esac