git-stash.sh

   1 #!/bin/sh
   2 # Copyright (c) 2007, Nanako Shiraishi
   3
   4 USAGE='[ | list | show | apply | clear]'
   5
   6 . git-sh-setup
   7 require_work_tree
   8
   9 TMP="$GIT_DIR/.git-stash.$$"
  10 trap 'rm -f "$TMP-*"' 0
  11
  12 ref_stash=refs/stash
  13
  14 no_changes () {
  15         git diff-index --quiet --cached HEAD &&
  16         git diff-files --quiet
  17 }
  18
  19 clear_stash () {
  20         logfile="$GIT_DIR/logs/$ref_stash" &&
  21         mkdir -p "$(dirname "$logfile")" &&
  22         : >"$logfile"
  23 }
  24
  25 save_stash () {
  26         if no_changes
  27         then
  28                 echo >&2 'No local changes to save'
  29                 exit 0
  30         fi
  31         test -f "$GIT_DIR/logs/$ref_stash" ||
  32                 clear_stash || die "Cannot initialize stash"
  33
  34         # state of the base commit
  35         if b_commit=$(git rev-parse --verify HEAD)
  36         then
  37                 head=$(git log --abbrev-commit --pretty=oneline -n 1 HEAD)
  38         else
  39                 die "You do not have the initial commit yet"
  40         fi
  41
  42         if branch=$(git symbolic-ref -q HEAD)
  43         then
  44                 branch=${branch#refs/heads/}
  45         else
  46                 branch='(no branch)'
  47         fi
  48         msg=$(printf '%s: %s' "$branch" "$head")
  49
  50         # state of the index
  51         i_tree=$(git write-tree) &&
  52         i_commit=$(printf 'index on %s' "$msg" |
  53                 git commit-tree $i_tree -p $b_commit) ||
  54                 die "Cannot save the current index state"
  55
  56         # state of the working tree
  57         w_tree=$( (
  58                 GIT_INDEX_FILE="$TMP-index" &&
  59                 export GIT_INDEX_FILE &&
  60
  61                 rm -f "$TMP-index" &&
  62                 git read-tree $i_tree &&
  63                 git add -u &&
  64                 git write-tree &&
  65                 rm -f "$TMP-index"
  66         ) ) ||
  67                 die "Cannot save the current worktree state"
  68
  69         # create the stash
  70         w_commit=$(printf 'WIP on %s\n' "$msg" |
  71                 git commit-tree $w_tree -p $b_commit -p $i_commit) ||
  72                 die "Cannot record working tree state"
  73
  74         git update-ref -m "$msg" $ref_stash $w_commit ||
  75                 die "Cannot save the current status"
  76         printf >&2 'Saved WIP on %s\n' "$msg"
  77 }
  78
  79 have_stash () {
  80         git rev-parse --verify $ref_stash >/dev/null 2>&1
  81 }
  82
  83 list_stash () {
  84         have_stash || return 0
  85         git log --pretty=oneline -g "$@" $ref_stash |
  86         sed -n -e 's/^[.0-9a-f]* refs\///p'
  87 }
  88
  89 show_stash () {
  90         flags=$(git rev-parse --no-revs --flags "$@")
  91         if test -z "$flags"
  92         then
  93                 flags=--stat
  94         fi
  95         s=$(git rev-parse --revs-only --no-flags --default $ref_stash "$@")
  96
  97         w_commit=$(git rev-parse --verify "$s") &&
  98         b_commit=$(git rev-parse --verify "$s^") &&
  99         git diff $flags $b_commit $w_commit
 100 }
 101
 102 apply_stash () {
 103         git diff-files --quiet ||
 104                 die 'Cannot restore on top of a dirty state'
 105
 106         # current index state
 107         c_tree=$(git write-tree) ||
 108                 die 'Cannot apply a stash in the middle of a merge'
 109
 110         s=$(git rev-parse --revs-only --no-flags --default $ref_stash "$@") &&
 111         w_tree=$(git rev-parse --verify "$s:") &&
 112         b_tree=$(git rev-parse --verify "$s^:") ||
 113                 die "$*: no valid stashed state found"
 114
 115         eval "
 116                 GITHEAD_$w_tree='Stashed changes' &&
 117                 GITHEAD_$c_tree='Updated upstream' &&
 118                 GITHEAD_$b_tree='Version stash was based on' &&
 119                 export GITHEAD_$w_tree GITHEAD_$c_tree GITHEAD_$b_tree
 120         "
 121
 122         if git-merge-recursive $b_tree -- $c_tree $w_tree
 123         then
 124                 # No conflict
 125                 a="$TMP-added" &&
 126                 git diff --cached --name-only --diff-filter=A $c_tree >"$a" &&
 127                 git read-tree --reset $c_tree &&
 128                 git update-index --add --stdin <"$a" ||
 129                         die "Cannot unstage modified files"
 130                 git-status
 131                 rm -f "$a"
 132         else
 133                 # Merge conflict; keep the exit status from merge-recursive
 134                 exit
 135         fi
 136 }
 137
 138 # Main command set
 139 case "$1" in
 140 list)
 141         shift
 142         if test $# = 0
 143         then
 144                 set x -n 10
 145                 shift
 146         fi
 147         list_stash "$@"
 148         ;;
 149 show)
 150         shift
 151         show_stash "$@"
 152         ;;
 153 apply)
 154         shift
 155         apply_stash "$@"
 156         ;;
 157 clear)
 158         clear_stash
 159         ;;
 160 save | '')
 161         save_stash && git-reset --hard
 162         ;;
 163 *)
 164         usage
 165 esac