Andrew's git - gitweb.git/blob

   1#!/bin/sh
   2# Copyright (c) 2007, Nanako Shiraishi
   3
   4USAGE='[ | list | show | apply | clear]'
   5
   6. git-sh-setup
   7require_work_tree
   8
   9TMP="$GIT_DIR/.git-stash.$$"
  10trap 'rm -f "$TMP-*"' 0
  11
  12ref_stash=refs/stash
  13
  14no_changes () {
  15        git diff-index --quiet --cached HEAD &&
  16        git diff-files --quiet
  17}
  18
  19clear_stash () {
  20        logfile="$GIT_DIR/logs/$ref_stash" &&
  21        mkdir -p "$(dirname "$logfile")" &&
  22        : >"$logfile"
  23}
  24
  25save_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 "WIP on $msg" $ref_stash $w_commit ||
  75                die "Cannot save the current status"
  76        printf >&2 'Saved WIP on %s\n' "$msg"
  77}
  78
  79have_stash () {
  80        git rev-parse --verify $ref_stash >/dev/null 2>&1
  81}
  82
  83list_stash () {
  84        have_stash || return 0
  85        git log --pretty=oneline -g "$@" $ref_stash |
  86        sed -n -e 's/^[.0-9a-f]* refs\///p'
  87}
  88
  89show_stash () {
  90        flags=$(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 $w_commit
 100}
 101
 102apply_stash () {
 103        git diff-files --quiet ||
 104                die 'Cannot restore on top of a dirty state'
 105
 106        # current index state
 107        c_tree=$(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
 139case "$1" in
 140list)
 141        shift
 142        if test $# = 0
 143        then
 144                set x -n 10
 145                shift
 146        fi
 147        list_stash "$@"
 148        ;;
 149show)
 150        shift
 151        show_stash "$@"
 152        ;;
 153apply)
 154        shift
 155        apply_stash "$@"
 156        ;;
 157clear)
 158        clear_stash
 159        ;;
 160save | '')
 161        save_stash && git-reset --hard
 162        ;;
 163*)
 164        usage
 165esac