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=$(git log --no-color --abbrev-commit --pretty=oneline -n 1 HEAD --)
  61         else
  62                 die "You do not have the initial commit yet"
  63         fi
  64
  65         if branch=$(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                         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 $ref_stash >/dev/null 2>&1
 205 }
 206
 207 list_stash () {
 208         have_stash || return 0
 209         git log --format="%gd: %gs" -g "$@" $ref_stash --
 210 }
 211
 212 show_stash () {
 213         have_stash || die 'No stash found'
 214
 215         flags=$(git rev-parse --no-revs --flags "$@")
 216         if test -z "$flags"
 217         then
 218                 flags=--stat
 219         fi
 220
 221         w_commit=$(git rev-parse --quiet --verify --default $ref_stash "$@") &&
 222         b_commit=$(git rev-parse --quiet --verify "$w_commit^") ||
 223                 die "'$*' is not a stash"
 224
 225         git diff $flags $b_commit $w_commit
 226 }
 227
 228 apply_stash () {
 229         applied_stash=
 230         unstash_index=
 231
 232         while test $# != 0
 233         do
 234                 case "$1" in
 235                 --index)
 236                         unstash_index=t
 237                         ;;
 238                 -q|--quiet)
 239                         GIT_QUIET=t
 240                         ;;
 241                 *)
 242                         break
 243                         ;;
 244                 esac
 245                 shift
 246         done
 247
 248         if test $# = 0
 249         then
 250                 have_stash || die 'Nothing to apply'
 251                 applied_stash="$ref_stash@{0}"
 252         else
 253                 applied_stash="$*"
 254         fi
 255
 256         # stash records the work tree, and is a merge between the
 257         # base commit (first parent) and the index tree (second parent).
 258         s=$(git rev-parse --quiet --verify --default $ref_stash "$@") &&
 259         w_tree=$(git rev-parse --quiet --verify "$s:") &&
 260         b_tree=$(git rev-parse --quiet --verify "$s^1:") &&
 261         i_tree=$(git rev-parse --quiet --verify "$s^2:") ||
 262                 die "$*: no valid stashed state found"
 263
 264         git update-index -q --refresh &&
 265         git diff-files --quiet --ignore-submodules ||
 266                 die 'Cannot apply to a dirty working tree, please stage your changes'
 267
 268         # current index state
 269         c_tree=$(git write-tree) ||
 270                 die 'Cannot apply a stash in the middle of a merge'
 271
 272         unstashed_index_tree=
 273         if test -n "$unstash_index" && test "$b_tree" != "$i_tree" &&
 274                         test "$c_tree" != "$i_tree"
 275         then
 276                 git diff-tree --binary $s^2^..$s^2 | git apply --cached
 277                 test $? -ne 0 &&
 278                         die 'Conflicts in index. Try without --index.'
 279                 unstashed_index_tree=$(git write-tree) ||
 280                         die 'Could not save index tree'
 281                 git reset
 282         fi
 283
 284         eval "
 285                 GITHEAD_$w_tree='Stashed changes' &&
 286                 GITHEAD_$c_tree='Updated upstream' &&
 287                 GITHEAD_$b_tree='Version stash was based on' &&
 288                 export GITHEAD_$w_tree GITHEAD_$c_tree GITHEAD_$b_tree
 289         "
 290
 291         if test -n "$GIT_QUIET"
 292         then
 293                 export GIT_MERGE_VERBOSITY=0
 294         fi
 295         if git merge-recursive $b_tree -- $c_tree $w_tree
 296         then
 297                 # No conflict
 298                 if test -n "$unstashed_index_tree"
 299                 then
 300                         git read-tree "$unstashed_index_tree"
 301                 else
 302                         a="$TMP-added" &&
 303                         git diff-index --cached --name-only --diff-filter=A $c_tree >"$a" &&
 304                         git read-tree --reset $c_tree &&
 305                         git update-index --add --stdin <"$a" ||
 306                                 die "Cannot unstage modified files"
 307                         rm -f "$a"
 308                 fi
 309                 squelch=
 310                 if test -n "$GIT_QUIET"
 311                 then
 312                         squelch='>/dev/null 2>&1'
 313                 fi
 314                 eval "git status $squelch" || :
 315         else
 316                 # Merge conflict; keep the exit status from merge-recursive
 317                 status=$?
 318                 if test -n "$unstash_index"
 319                 then
 320                         echo >&2 'Index was not unstashed.'
 321                 fi
 322                 exit $status
 323         fi
 324 }
 325
 326 drop_stash () {
 327         have_stash || die 'No stash entries to drop'
 328
 329         while test $# != 0
 330         do
 331                 case "$1" in
 332                 -q|--quiet)
 333                         GIT_QUIET=t
 334                         ;;
 335                 *)
 336                         break
 337                         ;;
 338                 esac
 339                 shift
 340         done
 341
 342         if test $# = 0
 343         then
 344                 set x "$ref_stash@{0}"
 345                 shift
 346         fi
 347         # Verify supplied argument looks like a stash entry
 348         s=$(git rev-parse --verify "$@") &&
 349         git rev-parse --verify "$s:"   > /dev/null 2>&1 &&
 350         git rev-parse --verify "$s^1:" > /dev/null 2>&1 &&
 351         git rev-parse --verify "$s^2:" > /dev/null 2>&1 ||
 352                 die "$*: not a valid stashed state"
 353
 354         git reflog delete --updateref --rewrite "$@" &&
 355                 say "Dropped $* ($s)" || die "$*: Could not drop stash entry"
 356
 357         # clear_stash if we just dropped the last stash entry
 358         git rev-parse --verify "$ref_stash@{0}" > /dev/null 2>&1 || clear_stash
 359 }
 360
 361 apply_to_branch () {
 362         have_stash || die 'Nothing to apply'
 363
 364         test -n "$1" || die 'No branch name specified'
 365         branch=$1
 366
 367         if test -z "$2"
 368         then
 369                 set x "$ref_stash@{0}"
 370         fi
 371         stash=$2
 372
 373         git checkout -b $branch $stash^ &&
 374         apply_stash --index $stash &&
 375         drop_stash $stash
 376 }
 377
 378 # The default command is "save" if nothing but options are given
 379 seen_non_option=
 380 for opt
 381 do
 382         case "$opt" in
 383         -*) ;;
 384         *) seen_non_option=t; break ;;
 385         esac
 386 done
 387
 388 test -n "$seen_non_option" || set "save" "$@"
 389
 390 # Main command set
 391 case "$1" in
 392 list)
 393         shift
 394         list_stash "$@"
 395         ;;
 396 show)
 397         shift
 398         show_stash "$@"
 399         ;;
 400 save)
 401         shift
 402         save_stash "$@"
 403         ;;
 404 apply)
 405         shift
 406         apply_stash "$@"
 407         ;;
 408 clear)
 409         shift
 410         clear_stash "$@"
 411         ;;
 412 create)
 413         if test $# -gt 0 && test "$1" = create
 414         then
 415                 shift
 416         fi
 417         create_stash "$*" && echo "$w_commit"
 418         ;;
 419 drop)
 420         shift
 421         drop_stash "$@"
 422         ;;
 423 pop)
 424         shift
 425         if apply_stash "$@"
 426         then
 427                 drop_stash "$applied_stash"
 428         fi
 429         ;;
 430 branch)
 431         shift
 432         apply_to_branch "$@"
 433         ;;
 434 *)
 435         case $# in
 436         0)
 437                 save_stash &&
 438                 say '(To restore them type "git stash apply")'
 439                 ;;
 440         *)
 441                 usage
 442         esac
 443         ;;
 444 esac