git-stash.sh

   1 #!/bin/sh
   2 # Copyright (c) 2007, Nanako Shiraishi
   3
   4 USAGE='[ | list | show | apply | clear]'
   5
   6 SUBDIRECTORY_OK=Yes
   7 OPTIONS_SPEC=
   8 . git-sh-setup
   9 require_work_tree
  10 cd_to_toplevel
  11
  12 TMP="$GIT_DIR/.git-stash.$$"
  13 trap 'rm -f "$TMP-*"' 0
  14
  15 ref_stash=refs/stash
  16
  17 no_changes () {
  18         git diff-index --quiet --cached HEAD &&
  19         git diff-files --quiet
  20 }
  21
  22 clear_stash () {
  23         if current=$(git rev-parse --verify $ref_stash 2>/dev/null)
  24         then
  25                 git update-ref -d $ref_stash $current
  26         fi
  27 }
  28
  29 create_stash () {
  30         stash_msg="$1"
  31
  32         if no_changes
  33         then
  34                 exit 0
  35         fi
  36
  37         # state of the base commit
  38         if b_commit=$(git rev-parse --verify HEAD)
  39         then
  40                 head=$(git log --abbrev-commit --pretty=oneline -n 1 HEAD)
  41         else
  42                 die "You do not have the initial commit yet"
  43         fi
  44
  45         if branch=$(git symbolic-ref -q HEAD)
  46         then
  47                 branch=${branch#refs/heads/}
  48         else
  49                 branch='(no branch)'
  50         fi
  51         msg=$(printf '%s: %s' "$branch" "$head")
  52
  53         # state of the index
  54         i_tree=$(git write-tree) &&
  55         i_commit=$(printf 'index on %s\n' "$msg" |
  56                 git commit-tree $i_tree -p $b_commit) ||
  57                 die "Cannot save the current index state"
  58
  59         # state of the working tree
  60         w_tree=$( (
  61                 rm -f "$TMP-index" &&
  62                 cp -p ${GIT_INDEX_FILE-"$GIT_DIR/index"} "$TMP-index" &&
  63                 GIT_INDEX_FILE="$TMP-index" &&
  64                 export GIT_INDEX_FILE &&
  65                 git read-tree -m $i_tree &&
  66                 git add -u &&
  67                 git write-tree &&
  68                 rm -f "$TMP-index"
  69         ) ) ||
  70                 die "Cannot save the current worktree state"
  71
  72         # create the stash
  73         if test -z "$stash_msg"
  74         then
  75                 stash_msg=$(printf 'WIP on %s' "$msg")
  76         else
  77                 stash_msg=$(printf 'On %s: %s' "$branch" "$stash_msg")
  78         fi
  79         w_commit=$(printf '%s\n' "$stash_msg" |
  80                 git commit-tree $w_tree -p $b_commit -p $i_commit) ||
  81                 die "Cannot record working tree state"
  82 }
  83
  84 save_stash () {
  85         stash_msg="$1"
  86
  87         if no_changes
  88         then
  89                 echo >&2 'No local changes to save'
  90                 exit 0
  91         fi
  92         test -f "$GIT_DIR/logs/$ref_stash" ||
  93                 clear_stash || die "Cannot initialize stash"
  94
  95         create_stash "$stash_msg"
  96
  97         # Make sure the reflog for stash is kept.
  98         : >>"$GIT_DIR/logs/$ref_stash"
  99
 100         git update-ref -m "$stash_msg" $ref_stash $w_commit ||
 101                 die "Cannot save the current status"
 102         printf >&2 'Saved "%s"\n' "$stash_msg"
 103 }
 104
 105 have_stash () {
 106         git rev-parse --verify $ref_stash >/dev/null 2>&1
 107 }
 108
 109 list_stash () {
 110         have_stash || return 0
 111         git log --pretty=oneline -g "$@" $ref_stash |
 112         sed -n -e 's/^[.0-9a-f]* refs\///p'
 113 }
 114
 115 show_stash () {
 116         flags=$(git rev-parse --no-revs --flags "$@")
 117         if test -z "$flags"
 118         then
 119                 flags=--stat
 120         fi
 121         s=$(git rev-parse --revs-only --no-flags --default $ref_stash "$@")
 122
 123         w_commit=$(git rev-parse --verify "$s") &&
 124         b_commit=$(git rev-parse --verify "$s^") &&
 125         git diff $flags $b_commit $w_commit
 126 }
 127
 128 apply_stash () {
 129         git diff-files --quiet ||
 130                 die 'Cannot restore on top of a dirty state'
 131
 132         unstash_index=
 133         case "$1" in
 134         --index)
 135                 unstash_index=t
 136                 shift
 137         esac
 138
 139         # current index state
 140         c_tree=$(git write-tree) ||
 141                 die 'Cannot apply a stash in the middle of a merge'
 142
 143         # stash records the work tree, and is a merge between the
 144         # base commit (first parent) and the index tree (second parent).
 145         s=$(git rev-parse --revs-only --no-flags --default $ref_stash "$@") &&
 146         w_tree=$(git rev-parse --verify "$s:") &&
 147         b_tree=$(git rev-parse --verify "$s^1:") &&
 148         i_tree=$(git rev-parse --verify "$s^2:") ||
 149                 die "$*: no valid stashed state found"
 150
 151         unstashed_index_tree=
 152         if test -n "$unstash_index" && test "$b_tree" != "$i_tree"
 153         then
 154                 git diff-tree --binary $s^2^..$s^2 | git apply --cached
 155                 test $? -ne 0 &&
 156                         die 'Conflicts in index. Try without --index.'
 157                 unstashed_index_tree=$(git-write-tree) ||
 158                         die 'Could not save index tree'
 159                 git reset
 160         fi
 161
 162         eval "
 163                 GITHEAD_$w_tree='Stashed changes' &&
 164                 GITHEAD_$c_tree='Updated upstream' &&
 165                 GITHEAD_$b_tree='Version stash was based on' &&
 166                 export GITHEAD_$w_tree GITHEAD_$c_tree GITHEAD_$b_tree
 167         "
 168
 169         if git-merge-recursive $b_tree -- $c_tree $w_tree
 170         then
 171                 # No conflict
 172                 if test -n "$unstashed_index_tree"
 173                 then
 174                         git read-tree "$unstashed_index_tree"
 175                 else
 176                         a="$TMP-added" &&
 177                         git diff-index --cached --name-only --diff-filter=A $c_tree >"$a" &&
 178                         git read-tree --reset $c_tree &&
 179                         git update-index --add --stdin <"$a" ||
 180                                 die "Cannot unstage modified files"
 181                         rm -f "$a"
 182                 fi
 183                 git status || :
 184         else
 185                 # Merge conflict; keep the exit status from merge-recursive
 186                 status=$?
 187                 if test -n "$unstash_index"
 188                 then
 189                         echo >&2 'Index was not unstashed.'
 190                 fi
 191                 exit $status
 192         fi
 193 }
 194
 195 # Main command set
 196 case "$1" in
 197 list)
 198         shift
 199         if test $# = 0
 200         then
 201                 set x -n 10
 202                 shift
 203         fi
 204         list_stash "$@"
 205         ;;
 206 show)
 207         shift
 208         show_stash "$@"
 209         ;;
 210 apply)
 211         shift
 212         apply_stash "$@"
 213         ;;
 214 clear)
 215         clear_stash
 216         ;;
 217 create)
 218         if test $# -gt 0 && test "$1" = create
 219         then
 220                 shift
 221         fi
 222         create_stash "$*" && echo "$w_commit"
 223         ;;
 224 help | usage)
 225         usage
 226         ;;
 227 *)
 228         if test $# -gt 0 && test "$1" = save
 229         then
 230                 shift
 231         fi
 232         save_stash "$*" && git-reset --hard
 233         ;;
 234 esac