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 | drop ) [<stash>]
   7    or: $dashless ( pop | apply ) [--index] [<stash>]
   8    or: $dashless branch <branchname> [<stash>]
   9    or: $dashless [save [--keep-index] [<message>]]
  10    or: $dashless clear"
  11
  12 SUBDIRECTORY_OK=Yes
  13 OPTIONS_SPEC=
  14 . git-sh-setup
  15 require_work_tree
  16 cd_to_toplevel
  17
  18 TMP="$GIT_DIR/.git-stash.$$"
  19 trap 'rm -f "$TMP-*"' 0
  20
  21 ref_stash=refs/stash
  22
  23 no_changes () {
  24         git diff-index --quiet --cached HEAD --ignore-submodules -- &&
  25         git diff-files --quiet --ignore-submodules
  26 }
  27
  28 clear_stash () {
  29         if test $# != 0
  30         then
  31                 die "git stash clear with parameters is unimplemented"
  32         fi
  33         if current=$(git rev-parse --verify $ref_stash 2>/dev/null)
  34         then
  35                 git update-ref -d $ref_stash $current
  36         fi
  37 }
  38
  39 create_stash () {
  40         stash_msg="$1"
  41
  42         git update-index -q --refresh
  43         if no_changes
  44         then
  45                 exit 0
  46         fi
  47
  48         # state of the base commit
  49         if b_commit=$(git rev-parse --verify HEAD)
  50         then
  51                 head=$(git log --no-color --abbrev-commit --pretty=oneline -n 1 HEAD --)
  52         else
  53                 die "You do not have the initial commit yet"
  54         fi
  55
  56         if branch=$(git symbolic-ref -q HEAD)
  57         then
  58                 branch=${branch#refs/heads/}
  59         else
  60                 branch='(no branch)'
  61         fi
  62         msg=$(printf '%s: %s' "$branch" "$head")
  63
  64         # state of the index
  65         i_tree=$(git write-tree) &&
  66         i_commit=$(printf 'index on %s\n' "$msg" |
  67                 git commit-tree $i_tree -p $b_commit) ||
  68                 die "Cannot save the current index state"
  69
  70         # state of the working tree
  71         w_tree=$( (
  72                 rm -f "$TMP-index" &&
  73                 cp -p ${GIT_INDEX_FILE-"$GIT_DIR/index"} "$TMP-index" &&
  74                 GIT_INDEX_FILE="$TMP-index" &&
  75                 export GIT_INDEX_FILE &&
  76                 git read-tree -m $i_tree &&
  77                 git add -u &&
  78                 git write-tree &&
  79                 rm -f "$TMP-index"
  80         ) ) ||
  81                 die "Cannot save the current worktree state"
  82
  83         # create the stash
  84         if test -z "$stash_msg"
  85         then
  86                 stash_msg=$(printf 'WIP on %s' "$msg")
  87         else
  88                 stash_msg=$(printf 'On %s: %s' "$branch" "$stash_msg")
  89         fi
  90         w_commit=$(printf '%s\n' "$stash_msg" |
  91                 git commit-tree $w_tree -p $b_commit -p $i_commit) ||
  92                 die "Cannot record working tree state"
  93 }
  94
  95 save_stash () {
  96         keep_index=
  97         case "$1" in
  98         --keep-index)
  99                 keep_index=t
 100                 shift
 101         esac
 102
 103         stash_msg="$*"
 104
 105         git update-index -q --refresh
 106         if no_changes
 107         then
 108                 echo 'No local changes to save'
 109                 exit 0
 110         fi
 111         test -f "$GIT_DIR/logs/$ref_stash" ||
 112                 clear_stash || die "Cannot initialize stash"
 113
 114         create_stash "$stash_msg"
 115
 116         # Make sure the reflog for stash is kept.
 117         : >>"$GIT_DIR/logs/$ref_stash"
 118
 119         git update-ref -m "$stash_msg" $ref_stash $w_commit ||
 120                 die "Cannot save the current status"
 121         printf 'Saved working directory and index state "%s"\n' "$stash_msg"
 122
 123         git reset --hard
 124
 125         if test -n "$keep_index" && test -n $i_tree
 126         then
 127                 git read-tree --reset -u $i_tree
 128         fi
 129 }
 130
 131 have_stash () {
 132         git rev-parse --verify $ref_stash >/dev/null 2>&1
 133 }
 134
 135 list_stash () {
 136         have_stash || return 0
 137         git log --no-color --pretty=oneline -g "$@" $ref_stash -- |
 138         sed -n -e 's/^[.0-9a-f]* refs\///p'
 139 }
 140
 141 show_stash () {
 142         flags=$(git rev-parse --no-revs --flags "$@")
 143         if test -z "$flags"
 144         then
 145                 flags=--stat
 146         fi
 147
 148         w_commit=$(git rev-parse --verify --default $ref_stash "$@") &&
 149         b_commit=$(git rev-parse --verify "$w_commit^") &&
 150         git diff $flags $b_commit $w_commit
 151 }
 152
 153 apply_stash () {
 154         git update-index -q --refresh &&
 155         git diff-files --quiet --ignore-submodules ||
 156                 die 'Cannot apply to a dirty working tree, please stage your changes'
 157
 158         unstash_index=
 159         case "$1" in
 160         --index)
 161                 unstash_index=t
 162                 shift
 163         esac
 164
 165         # current index state
 166         c_tree=$(git write-tree) ||
 167                 die 'Cannot apply a stash in the middle of a merge'
 168
 169         # stash records the work tree, and is a merge between the
 170         # base commit (first parent) and the index tree (second parent).
 171         s=$(git rev-parse --verify --default $ref_stash "$@") &&
 172         w_tree=$(git rev-parse --verify "$s:") &&
 173         b_tree=$(git rev-parse --verify "$s^1:") &&
 174         i_tree=$(git rev-parse --verify "$s^2:") ||
 175                 die "$*: no valid stashed state found"
 176
 177         unstashed_index_tree=
 178         if test -n "$unstash_index" && test "$b_tree" != "$i_tree" &&
 179                         test "$c_tree" != "$i_tree"
 180         then
 181                 git diff-tree --binary $s^2^..$s^2 | git apply --cached
 182                 test $? -ne 0 &&
 183                         die 'Conflicts in index. Try without --index.'
 184                 unstashed_index_tree=$(git-write-tree) ||
 185                         die 'Could not save index tree'
 186                 git reset
 187         fi
 188
 189         eval "
 190                 GITHEAD_$w_tree='Stashed changes' &&
 191                 GITHEAD_$c_tree='Updated upstream' &&
 192                 GITHEAD_$b_tree='Version stash was based on' &&
 193                 export GITHEAD_$w_tree GITHEAD_$c_tree GITHEAD_$b_tree
 194         "
 195
 196         if git-merge-recursive $b_tree -- $c_tree $w_tree
 197         then
 198                 # No conflict
 199                 if test -n "$unstashed_index_tree"
 200                 then
 201                         git read-tree "$unstashed_index_tree"
 202                 else
 203                         a="$TMP-added" &&
 204                         git diff-index --cached --name-only --diff-filter=A $c_tree >"$a" &&
 205                         git read-tree --reset $c_tree &&
 206                         git update-index --add --stdin <"$a" ||
 207                                 die "Cannot unstage modified files"
 208                         rm -f "$a"
 209                 fi
 210                 git status || :
 211         else
 212                 # Merge conflict; keep the exit status from merge-recursive
 213                 status=$?
 214                 if test -n "$unstash_index"
 215                 then
 216                         echo >&2 'Index was not unstashed.'
 217                 fi
 218                 exit $status
 219         fi
 220 }
 221
 222 drop_stash () {
 223         have_stash || die 'No stash entries to drop'
 224
 225         if test $# = 0
 226         then
 227                 set x "$ref_stash@{0}"
 228                 shift
 229         fi
 230         # Verify supplied argument looks like a stash entry
 231         s=$(git rev-parse --verify "$@") &&
 232         git rev-parse --verify "$s:"   > /dev/null 2>&1 &&
 233         git rev-parse --verify "$s^1:" > /dev/null 2>&1 &&
 234         git rev-parse --verify "$s^2:" > /dev/null 2>&1 ||
 235                 die "$*: not a valid stashed state"
 236
 237         git reflog delete --updateref --rewrite "$@" &&
 238                 echo "Dropped $* ($s)" || die "$*: Could not drop stash entry"
 239
 240         # clear_stash if we just dropped the last stash entry
 241         git rev-parse --verify "$ref_stash@{0}" > /dev/null 2>&1 || clear_stash
 242 }
 243
 244 apply_to_branch () {
 245         have_stash || die 'Nothing to apply'
 246
 247         test -n "$1" || die 'No branch name specified'
 248         branch=$1
 249
 250         if test -z "$2"
 251         then
 252                 set x "$ref_stash@{0}"
 253         fi
 254         stash=$2
 255
 256         git-checkout -b $branch $stash^ &&
 257         apply_stash --index $stash &&
 258         drop_stash $stash
 259 }
 260
 261 # Main command set
 262 case "$1" in
 263 list)
 264         shift
 265         if test $# = 0
 266         then
 267                 set x -n 10
 268                 shift
 269         fi
 270         list_stash "$@"
 271         ;;
 272 show)
 273         shift
 274         show_stash "$@"
 275         ;;
 276 save)
 277         shift
 278         save_stash "$@"
 279         ;;
 280 apply)
 281         shift
 282         apply_stash "$@"
 283         ;;
 284 clear)
 285         shift
 286         clear_stash "$@"
 287         ;;
 288 create)
 289         if test $# -gt 0 && test "$1" = create
 290         then
 291                 shift
 292         fi
 293         create_stash "$*" && echo "$w_commit"
 294         ;;
 295 drop)
 296         shift
 297         drop_stash "$@"
 298         ;;
 299 pop)
 300         shift
 301         if apply_stash "$@"
 302         then
 303                 test -z "$unstash_index" || shift
 304                 drop_stash "$@"
 305         fi
 306         ;;
 307 branch)
 308         shift
 309         apply_to_branch "$@"
 310         ;;
 311 *)
 312         if test $# -eq 0
 313         then
 314                 save_stash &&
 315                 echo '(To restore them type "git stash apply")'
 316         else
 317                 usage
 318         fi
 319         ;;
 320 esac