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: $dashless clear"
  12
  13 SUBDIRECTORY_OK=Yes
  14 OPTIONS_SPEC=
  15 START_DIR=`pwd`
  16 . git-sh-setup
  17 . git-sh-i18n
  18 require_work_tree
  19 cd_to_toplevel
  20
  21 TMP="$GIT_DIR/.git-stash.$$"
  22 TMPindex=${GIT_INDEX_FILE-"$GIT_DIR/index"}.stash.$$
  23 trap 'rm -f "$TMP-"* "$TMPindex"' 0
  24
  25 ref_stash=refs/stash
  26
  27 if git config --get-colorbool color.interactive; then
  28        help_color="$(git config --get-color color.interactive.help 'red bold')"
  29        reset_color="$(git config --get-color '' reset)"
  30 else
  31        help_color=
  32        reset_color=
  33 fi
  34
  35 no_changes () {
  36         git diff-index --quiet --cached HEAD --ignore-submodules -- &&
  37         git diff-files --quiet --ignore-submodules
  38 }
  39
  40 clear_stash () {
  41         if test $# != 0
  42         then
  43                 die "git stash clear with parameters is unimplemented"
  44         fi
  45         if current=$(git rev-parse --verify $ref_stash 2>/dev/null)
  46         then
  47                 git update-ref -d $ref_stash $current
  48         fi
  49 }
  50
  51 create_stash () {
  52         stash_msg="$1"
  53
  54         git update-index -q --refresh
  55         if no_changes
  56         then
  57                 exit 0
  58         fi
  59
  60         # state of the base commit
  61         if b_commit=$(git rev-parse --verify HEAD)
  62         then
  63                 head=$(git rev-list --oneline -n 1 HEAD --)
  64         else
  65                 die "You do not have the initial commit yet"
  66         fi
  67
  68         if branch=$(git symbolic-ref -q HEAD)
  69         then
  70                 branch=${branch#refs/heads/}
  71         else
  72                 branch='(no branch)'
  73         fi
  74         msg=$(printf '%s: %s' "$branch" "$head")
  75
  76         # state of the index
  77         i_tree=$(git write-tree) &&
  78         i_commit=$(printf 'index on %s\n' "$msg" |
  79                 git commit-tree $i_tree -p $b_commit) ||
  80                 die "Cannot save the current index state"
  81
  82         if test -z "$patch_mode"
  83         then
  84
  85                 # state of the working tree
  86                 w_tree=$( (
  87                         git read-tree --index-output="$TMPindex" -m $i_tree &&
  88                         GIT_INDEX_FILE="$TMPindex" &&
  89                         export GIT_INDEX_FILE &&
  90                         git diff --name-only -z HEAD | git update-index -z --add --remove --stdin &&
  91                         git write-tree &&
  92                         rm -f "$TMPindex"
  93                 ) ) ||
  94                         die "Cannot save the current worktree state"
  95
  96         else
  97
  98                 rm -f "$TMP-index" &&
  99                 GIT_INDEX_FILE="$TMP-index" git read-tree HEAD &&
 100
 101                 # find out what the user wants
 102                 GIT_INDEX_FILE="$TMP-index" \
 103                         git add--interactive --patch=stash -- &&
 104
 105                 # state of the working tree
 106                 w_tree=$(GIT_INDEX_FILE="$TMP-index" git write-tree) ||
 107                 die "Cannot save the current worktree state"
 108
 109                 git diff-tree -p HEAD $w_tree > "$TMP-patch" &&
 110                 test -s "$TMP-patch" ||
 111                 die "No changes selected"
 112
 113                 rm -f "$TMP-index" ||
 114                 die "Cannot remove temporary index (can't happen)"
 115
 116         fi
 117
 118         # create the stash
 119         if test -z "$stash_msg"
 120         then
 121                 stash_msg=$(printf 'WIP on %s' "$msg")
 122         else
 123                 stash_msg=$(printf 'On %s: %s' "$branch" "$stash_msg")
 124         fi
 125         w_commit=$(printf '%s\n' "$stash_msg" |
 126                 git commit-tree $w_tree -p $b_commit -p $i_commit) ||
 127                 die "Cannot record working tree state"
 128 }
 129
 130 save_stash () {
 131         keep_index=
 132         patch_mode=
 133         while test $# != 0
 134         do
 135                 case "$1" in
 136                 -k|--keep-index)
 137                         keep_index=t
 138                         ;;
 139                 --no-keep-index)
 140                         keep_index=n
 141                         ;;
 142                 -p|--patch)
 143                         patch_mode=t
 144                         # only default to keep if we don't already have an override
 145                         test -z "$keep_index" && keep_index=t
 146                         ;;
 147                 -q|--quiet)
 148                         GIT_QUIET=t
 149                         ;;
 150                 --)
 151                         shift
 152                         break
 153                         ;;
 154                 -*)
 155                         echo "error: unknown option for 'stash save': $1"
 156                         echo "       To provide a message, use git stash save -- '$1'"
 157                         usage
 158                         ;;
 159                 *)
 160                         break
 161                         ;;
 162                 esac
 163                 shift
 164         done
 165
 166         stash_msg="$*"
 167
 168         git update-index -q --refresh
 169         if no_changes
 170         then
 171                 say 'No local changes to save'
 172                 exit 0
 173         fi
 174         test -f "$GIT_DIR/logs/$ref_stash" ||
 175                 clear_stash || die "Cannot initialize stash"
 176
 177         create_stash "$stash_msg"
 178
 179         # Make sure the reflog for stash is kept.
 180         : >>"$GIT_DIR/logs/$ref_stash"
 181
 182         git update-ref -m "$stash_msg" $ref_stash $w_commit ||
 183                 die "Cannot save the current status"
 184         say Saved working directory and index state "$stash_msg"
 185
 186         if test -z "$patch_mode"
 187         then
 188                 git reset --hard ${GIT_QUIET:+-q}
 189
 190                 if test "$keep_index" = "t" && test -n $i_tree
 191                 then
 192                         git read-tree --reset -u $i_tree
 193                 fi
 194         else
 195                 git apply -R < "$TMP-patch" ||
 196                 die "Cannot remove worktree changes"
 197
 198                 if test "$keep_index" != "t"
 199                 then
 200                         git reset
 201                 fi
 202         fi
 203 }
 204
 205 have_stash () {
 206         git rev-parse --verify $ref_stash >/dev/null 2>&1
 207 }
 208
 209 list_stash () {
 210         have_stash || return 0
 211         git log --format="%gd: %gs" -g "$@" $ref_stash --
 212 }
 213
 214 show_stash () {
 215         assert_stash_like "$@"
 216
 217         git diff ${FLAGS:---stat} $b_commit $w_commit
 218 }
 219
 220 #
 221 # Parses the remaining options looking for flags and
 222 # at most one revision defaulting to ${ref_stash}@{0}
 223 # if none found.
 224 #
 225 # Derives related tree and commit objects from the
 226 # revision, if one is found.
 227 #
 228 # stash records the work tree, and is a merge between the
 229 # base commit (first parent) and the index tree (second parent).
 230 #
 231 #   REV is set to the symbolic version of the specified stash-like commit
 232 #   IS_STASH_LIKE is non-blank if ${REV} looks like a stash
 233 #   IS_STASH_REF is non-blank if the ${REV} looks like a stash ref
 234 #   s is set to the SHA1 of the stash commit
 235 #   w_commit is set to the commit containing the working tree
 236 #   b_commit is set to the base commit
 237 #   i_commit is set to the commit containing the index tree
 238 #   w_tree is set to the working tree
 239 #   b_tree is set to the base tree
 240 #   i_tree is set to the index tree
 241 #
 242 #   GIT_QUIET is set to t if -q is specified
 243 #   INDEX_OPTION is set to --index if --index is specified.
 244 #   FLAGS is set to the remaining flags
 245 #
 246 # dies if:
 247 #   * too many revisions specified
 248 #   * no revision is specified and there is no stash stack
 249 #   * a revision is specified which cannot be resolve to a SHA1
 250 #   * a non-existent stash reference is specified
 251 #
 252
 253 parse_flags_and_rev()
 254 {
 255         test "$PARSE_CACHE" = "$*" && return 0 # optimisation
 256         PARSE_CACHE="$*"
 257
 258         IS_STASH_LIKE=
 259         IS_STASH_REF=
 260         INDEX_OPTION=
 261         s=
 262         w_commit=
 263         b_commit=
 264         i_commit=
 265         w_tree=
 266         b_tree=
 267         i_tree=
 268
 269         REV=$(git rev-parse --no-flags --symbolic "$@") || exit 1
 270
 271         FLAGS=
 272         for opt
 273         do
 274                 case "$opt" in
 275                         -q|--quiet)
 276                                 GIT_QUIET=-t
 277                         ;;
 278                         --index)
 279                                 INDEX_OPTION=--index
 280                         ;;
 281                         -*)
 282                                 FLAGS="${FLAGS}${FLAGS:+ }$opt"
 283                         ;;
 284                 esac
 285         done
 286
 287         set -- $REV
 288
 289         case $# in
 290                 0)
 291                         have_stash || die "No stash found."
 292                         set -- ${ref_stash}@{0}
 293                 ;;
 294                 1)
 295                         :
 296                 ;;
 297                 *)
 298                         die "Too many revisions specified: $REV"
 299                 ;;
 300         esac
 301
 302         REV=$(git rev-parse --quiet --symbolic --verify $1 2>/dev/null) || die "$1 is not valid reference"
 303
 304         i_commit=$(git rev-parse --quiet --verify $REV^2 2>/dev/null) &&
 305         set -- $(git rev-parse $REV $REV^1 $REV: $REV^1: $REV^2: 2>/dev/null) &&
 306         s=$1 &&
 307         w_commit=$1 &&
 308         b_commit=$2 &&
 309         w_tree=$3 &&
 310         b_tree=$4 &&
 311         i_tree=$5 &&
 312         IS_STASH_LIKE=t &&
 313         test "$ref_stash" = "$(git rev-parse --symbolic-full-name "${REV%@*}")" &&
 314         IS_STASH_REF=t
 315 }
 316
 317 is_stash_like()
 318 {
 319         parse_flags_and_rev "$@"
 320         test -n "$IS_STASH_LIKE"
 321 }
 322
 323 assert_stash_like() {
 324         is_stash_like "$@" || die "'$*' is not a stash-like commit"
 325 }
 326
 327 is_stash_ref() {
 328         is_stash_like "$@" && test -n "$IS_STASH_REF"
 329 }
 330
 331 assert_stash_ref() {
 332         is_stash_ref "$@" || die "'$*' is not a stash reference"
 333 }
 334
 335 apply_stash () {
 336
 337         assert_stash_like "$@"
 338
 339         git update-index -q --refresh || die 'unable to refresh index'
 340
 341         # current index state
 342         c_tree=$(git write-tree) ||
 343                 die 'Cannot apply a stash in the middle of a merge'
 344
 345         unstashed_index_tree=
 346         if test -n "$INDEX_OPTION" && test "$b_tree" != "$i_tree" &&
 347                         test "$c_tree" != "$i_tree"
 348         then
 349                 git diff-tree --binary $s^2^..$s^2 | git apply --cached
 350                 test $? -ne 0 &&
 351                         die 'Conflicts in index. Try without --index.'
 352                 unstashed_index_tree=$(git write-tree) ||
 353                         die 'Could not save index tree'
 354                 git reset
 355         fi
 356
 357         eval "
 358                 GITHEAD_$w_tree='Stashed changes' &&
 359                 GITHEAD_$c_tree='Updated upstream' &&
 360                 GITHEAD_$b_tree='Version stash was based on' &&
 361                 export GITHEAD_$w_tree GITHEAD_$c_tree GITHEAD_$b_tree
 362         "
 363
 364         if test -n "$GIT_QUIET"
 365         then
 366                 GIT_MERGE_VERBOSITY=0 && export GIT_MERGE_VERBOSITY
 367         fi
 368         if git merge-recursive $b_tree -- $c_tree $w_tree
 369         then
 370                 # No conflict
 371                 if test -n "$unstashed_index_tree"
 372                 then
 373                         git read-tree "$unstashed_index_tree"
 374                 else
 375                         a="$TMP-added" &&
 376                         git diff-index --cached --name-only --diff-filter=A $c_tree >"$a" &&
 377                         git read-tree --reset $c_tree &&
 378                         git update-index --add --stdin <"$a" ||
 379                                 die "Cannot unstage modified files"
 380                         rm -f "$a"
 381                 fi
 382                 squelch=
 383                 if test -n "$GIT_QUIET"
 384                 then
 385                         squelch='>/dev/null 2>&1'
 386                 fi
 387                 (cd "$START_DIR" && eval "git status $squelch") || :
 388         else
 389                 # Merge conflict; keep the exit status from merge-recursive
 390                 status=$?
 391                 if test -n "$INDEX_OPTION"
 392                 then
 393                         echo >&2 'Index was not unstashed.'
 394                 fi
 395                 exit $status
 396         fi
 397 }
 398
 399 pop_stash() {
 400         assert_stash_ref "$@"
 401
 402         apply_stash "$@" &&
 403         drop_stash "$@"
 404 }
 405
 406 drop_stash () {
 407         assert_stash_ref "$@"
 408
 409         git reflog delete --updateref --rewrite "${REV}" &&
 410                 say "Dropped ${REV} ($s)" || die "${REV}: Could not drop stash entry"
 411
 412         # clear_stash if we just dropped the last stash entry
 413         git rev-parse --verify "$ref_stash@{0}" > /dev/null 2>&1 || clear_stash
 414 }
 415
 416 apply_to_branch () {
 417         test -n "$1" || die 'No branch name specified'
 418         branch=$1
 419         shift 1
 420
 421         set -- --index "$@"
 422         assert_stash_like "$@"
 423
 424         git checkout -b $branch $REV^ &&
 425         apply_stash "$@" && {
 426                 test -z "$IS_STASH_REF" || drop_stash "$@"
 427         }
 428 }
 429
 430 PARSE_CACHE='--not-parsed'
 431 # The default command is "save" if nothing but options are given
 432 seen_non_option=
 433 for opt
 434 do
 435         case "$opt" in
 436         -*) ;;
 437         *) seen_non_option=t; break ;;
 438         esac
 439 done
 440
 441 test -n "$seen_non_option" || set "save" "$@"
 442
 443 # Main command set
 444 case "$1" in
 445 list)
 446         shift
 447         list_stash "$@"
 448         ;;
 449 show)
 450         shift
 451         show_stash "$@"
 452         ;;
 453 save)
 454         shift
 455         save_stash "$@"
 456         ;;
 457 apply)
 458         shift
 459         apply_stash "$@"
 460         ;;
 461 clear)
 462         shift
 463         clear_stash "$@"
 464         ;;
 465 create)
 466         if test $# -gt 0 && test "$1" = create
 467         then
 468                 shift
 469         fi
 470         create_stash "$*" && echo "$w_commit"
 471         ;;
 472 drop)
 473         shift
 474         drop_stash "$@"
 475         ;;
 476 pop)
 477         shift
 478         pop_stash "$@"
 479         ;;
 480 branch)
 481         shift
 482         apply_to_branch "$@"
 483         ;;
 484 *)
 485         case $# in
 486         0)
 487                 save_stash &&
 488                 say '(To restore them type "git stash apply")'
 489                 ;;
 490         *)
 491                 usage
 492         esac
 493         ;;
 494 esac