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 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=$(git rev-list --oneline -n 1 HEAD --)
  61         else
  62                 die "You do not have the initial commit yet"
  63         fi
  64
  65         if branch=$(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 $i_tree &&
  89                         git diff --name-only -z HEAD | git update-index -z --add --remove --stdin &&
  90                         git write-tree &&
  91                         rm -f "$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                         echo "       To provide a message, use git stash save -- '$1'"
 155                         usage
 156                         ;;
 157                 *)
 158                         break
 159                         ;;
 160                 esac
 161                 shift
 162         done
 163
 164         stash_msg="$*"
 165
 166         git update-index -q --refresh
 167         if no_changes
 168         then
 169                 say 'No local changes to save'
 170                 exit 0
 171         fi
 172         test -f "$GIT_DIR/logs/$ref_stash" ||
 173                 clear_stash || die "Cannot initialize stash"
 174
 175         create_stash "$stash_msg"
 176
 177         # Make sure the reflog for stash is kept.
 178         : >>"$GIT_DIR/logs/$ref_stash"
 179
 180         git update-ref -m "$stash_msg" $ref_stash $w_commit ||
 181                 die "Cannot save the current status"
 182         say Saved working directory and index state "$stash_msg"
 183
 184         if test -z "$patch_mode"
 185         then
 186                 git reset --hard ${GIT_QUIET:+-q}
 187
 188                 if test -n "$keep_index" && test -n $i_tree
 189                 then
 190                         git read-tree --reset -u $i_tree
 191                 fi
 192         else
 193                 git apply -R < "$TMP-patch" ||
 194                 die "Cannot remove worktree changes"
 195
 196                 if test -z "$keep_index"
 197                 then
 198                         git reset
 199                 fi
 200         fi
 201 }
 202
 203 have_stash () {
 204         git rev-parse --verify $ref_stash >/dev/null 2>&1
 205 }
 206
 207 list_stash () {
 208         have_stash || return 0
 209         git log --format="%gd: %gs" -g "$@" $ref_stash --
 210 }
 211
 212 show_stash () {
 213         assert_stash_like "$@"
 214
 215         git diff ${FLAGS:---stat} $b_commit $w_commit
 216 }
 217
 218 #
 219 # Parses the remaining options looking for flags and
 220 # at most one revision defaulting to ${ref_stash}@{0}
 221 # if none found.
 222 #
 223 # Derives related tree and commit objects from the
 224 # revision, if one is found.
 225 #
 226 # stash records the work tree, and is a merge between the
 227 # base commit (first parent) and the index tree (second parent).
 228 #
 229 #   REV is set to the symbolic version of the specified stash-like commit
 230 #   IS_STASH_LIKE is non-blank if ${REV} looks like a stash
 231 #   IS_STASH_REF is non-blank if the ${REV} looks like a stash ref
 232 #   s is set to the SHA1 of the stash commit
 233 #   w_commit is set to the commit containing the working tree
 234 #   b_commit is set to the base commit
 235 #   i_commit is set to the commit containing the index tree
 236 #   w_tree is set to the working tree
 237 #   b_tree is set to the base tree
 238 #   i_tree is set to the index tree
 239 #
 240 #   GIT_QUIET is set to t if -q is specified
 241 #   INDEX_OPTION is set to --index if --index is specified.
 242 #   FLAGS is set to the remaining flags
 243 #
 244 # dies if:
 245 #   * too many revisions specified
 246 #   * no revision is specified and there is no stash stack
 247 #   * a revision is specified which cannot be resolve to a SHA1
 248 #   * a non-existent stash reference is specified
 249 #
 250
 251 parse_flags_and_rev()
 252 {
 253         test "$PARSE_CACHE" = "$*" && return 0 # optimisation
 254         PARSE_CACHE="$*"
 255
 256         IS_STASH_LIKE=
 257         IS_STASH_REF=
 258         INDEX_OPTION=
 259         s=
 260         w_commit=
 261         b_commit=
 262         i_commit=
 263         w_tree=
 264         b_tree=
 265         i_tree=
 266
 267         REV=$(git rev-parse --no-flags --symbolic "$@" 2>/dev/null)
 268
 269         FLAGS=
 270         for opt
 271         do
 272                 case "$opt" in
 273                         -q|--quiet)
 274                                 GIT_QUIET=-t
 275                         ;;
 276                         --index)
 277                                 INDEX_OPTION=--index
 278                         ;;
 279                         -*)
 280                                 FLAGS="${FLAGS}${FLAGS:+ }$opt"
 281                         ;;
 282                 esac
 283         done
 284
 285         set -- $REV
 286
 287         case $# in
 288                 0)
 289                         have_stash || die "No stash found."
 290                         set -- ${ref_stash}@{0}
 291                 ;;
 292                 1)
 293                         :
 294                 ;;
 295                 *)
 296                         die "Too many revisions specified: $REV"
 297                 ;;
 298         esac
 299
 300         REV=$(git rev-parse --quiet --symbolic --verify $1 2>/dev/null) || die "$1 is not valid reference"
 301
 302         i_commit=$(git rev-parse --quiet --verify $REV^2 2>/dev/null) &&
 303         set -- $(git rev-parse $REV $REV^1 $REV: $REV^1: $REV^2: 2>/dev/null) &&
 304         s=$1 &&
 305         w_commit=$1 &&
 306         b_commit=$2 &&
 307         w_tree=$3 &&
 308         b_tree=$4 &&
 309         i_tree=$5 &&
 310         IS_STASH_LIKE=t &&
 311         test "$ref_stash" = "$(git rev-parse --symbolic-full-name "${REV%@*}")" &&
 312         IS_STASH_REF=t
 313
 314         if test "${REV}" != "${REV%{*\}}"
 315         then
 316                 # maintainers: it would be better if git rev-parse indicated
 317                 # this condition with a non-zero status code but as of 1.7.2.1 it
 318                 # it did not. So, we use non-empty stderr output as a proxy for the
 319                 # condition of interest.
 320                 test -z "$(git rev-parse "$REV" 2>&1 >/dev/null)" || die "$REV does not exist in the stash log"
 321         fi
 322
 323 }
 324
 325 is_stash_like()
 326 {
 327         parse_flags_and_rev "$@"
 328         test -n "$IS_STASH_LIKE"
 329 }
 330
 331 assert_stash_like() {
 332         is_stash_like "$@" || die "'$*' is not a stash-like commit"
 333 }
 334
 335 is_stash_ref() {
 336         is_stash_like "$@" && test -n "$IS_STASH_REF"
 337 }
 338
 339 assert_stash_ref() {
 340         is_stash_ref "$@" || die "'$*' is not a stash reference"
 341 }
 342
 343 apply_stash () {
 344
 345         assert_stash_like "$@"
 346
 347         git update-index -q --refresh &&
 348         git diff-files --quiet --ignore-submodules ||
 349                 die 'Cannot apply to a dirty working tree, please stage your changes'
 350
 351         # current index state
 352         c_tree=$(git write-tree) ||
 353                 die 'Cannot apply a stash in the middle of a merge'
 354
 355         unstashed_index_tree=
 356         if test -n "$INDEX_OPTION" && test "$b_tree" != "$i_tree" &&
 357                         test "$c_tree" != "$i_tree"
 358         then
 359                 git diff-tree --binary $s^2^..$s^2 | git apply --cached
 360                 test $? -ne 0 &&
 361                         die 'Conflicts in index. Try without --index.'
 362                 unstashed_index_tree=$(git write-tree) ||
 363                         die 'Could not save index tree'
 364                 git reset
 365         fi
 366
 367         eval "
 368                 GITHEAD_$w_tree='Stashed changes' &&
 369                 GITHEAD_$c_tree='Updated upstream' &&
 370                 GITHEAD_$b_tree='Version stash was based on' &&
 371                 export GITHEAD_$w_tree GITHEAD_$c_tree GITHEAD_$b_tree
 372         "
 373
 374         if test -n "$GIT_QUIET"
 375         then
 376                 GIT_MERGE_VERBOSITY=0 && export GIT_MERGE_VERBOSITY
 377         fi
 378         if git merge-recursive $b_tree -- $c_tree $w_tree
 379         then
 380                 # No conflict
 381                 if test -n "$unstashed_index_tree"
 382                 then
 383                         git read-tree "$unstashed_index_tree"
 384                 else
 385                         a="$TMP-added" &&
 386                         git diff-index --cached --name-only --diff-filter=A $c_tree >"$a" &&
 387                         git read-tree --reset $c_tree &&
 388                         git update-index --add --stdin <"$a" ||
 389                                 die "Cannot unstage modified files"
 390                         rm -f "$a"
 391                 fi
 392                 squelch=
 393                 if test -n "$GIT_QUIET"
 394                 then
 395                         squelch='>/dev/null 2>&1'
 396                 fi
 397                 eval "git status $squelch" || :
 398         else
 399                 # Merge conflict; keep the exit status from merge-recursive
 400                 status=$?
 401                 if test -n "$INDEX_OPTION"
 402                 then
 403                         echo >&2 'Index was not unstashed.'
 404                 fi
 405                 exit $status
 406         fi
 407 }
 408
 409 pop_stash() {
 410         assert_stash_ref "$@"
 411
 412         apply_stash "$@" &&
 413         drop_stash "$@"
 414 }
 415
 416 drop_stash () {
 417         assert_stash_ref "$@"
 418
 419         git reflog delete --updateref --rewrite "${REV}" &&
 420                 say "Dropped ${REV} ($s)" || die "${REV}: Could not drop stash entry"
 421
 422         # clear_stash if we just dropped the last stash entry
 423         git rev-parse --verify "$ref_stash@{0}" > /dev/null 2>&1 || clear_stash
 424 }
 425
 426 apply_to_branch () {
 427         test -n "$1" || die 'No branch name specified'
 428         branch=$1
 429         shift 1
 430
 431         set -- --index "$@"
 432         assert_stash_like "$@"
 433
 434         git checkout -b $branch $REV^ &&
 435         apply_stash "$@" && {
 436                 test -z "$IS_STASH_REF" || drop_stash "$@"
 437         }
 438 }
 439
 440 PARSE_CACHE='--not-parsed'
 441 # The default command is "save" if nothing but options are given
 442 seen_non_option=
 443 for opt
 444 do
 445         case "$opt" in
 446         -*) ;;
 447         *) seen_non_option=t; break ;;
 448         esac
 449 done
 450
 451 test -n "$seen_non_option" || set "save" "$@"
 452
 453 # Main command set
 454 case "$1" in
 455 list)
 456         shift
 457         list_stash "$@"
 458         ;;
 459 show)
 460         shift
 461         show_stash "$@"
 462         ;;
 463 save)
 464         shift
 465         save_stash "$@"
 466         ;;
 467 apply)
 468         shift
 469         apply_stash "$@"
 470         ;;
 471 clear)
 472         shift
 473         clear_stash "$@"
 474         ;;
 475 create)
 476         if test $# -gt 0 && test "$1" = create
 477         then
 478                 shift
 479         fi
 480         create_stash "$*" && echo "$w_commit"
 481         ;;
 482 drop)
 483         shift
 484         drop_stash "$@"
 485         ;;
 486 pop)
 487         shift
 488         pop_stash "$@"
 489         ;;
 490 branch)
 491         shift
 492         apply_to_branch "$@"
 493         ;;
 494 *)
 495         case $# in
 496         0)
 497                 save_stash &&
 498                 say '(To restore them type "git stash apply")'
 499                 ;;
 500         *)
 501                 usage
 502         esac
 503         ;;
 504 esac