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tag: v1.5.3-rc1
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#!/bin/sh
# Copyright (c) 2007, Nanako Shiraishi

USAGE='[ | list | show | apply | clear]'

SUBDIRECTORY_OK=Yes
. git-sh-setup
require_work_tree

TMP="$GIT_DIR/.git-stash.$$"
trap 'rm -f "$TMP-*"' 0

ref_stash=refs/stash

no_changes () {
git diff-index --quiet --cached HEAD &&
git diff-files --quiet
}

clear_stash () {
logfile="$GIT_DIR/logs/$ref_stash" &&
mkdir -p "$(dirname "$logfile")" &&
: >"$logfile"
}

save_stash () {
stash_msg="$1"

if no_changes
then
echo >&2 'No local changes to save'
exit 0
fi
test -f "$GIT_DIR/logs/$ref_stash" ||
clear_stash || die "Cannot initialize stash"

# state of the base commit
if b_commit=$(git rev-parse --verify HEAD)
then
head=$(git log --abbrev-commit --pretty=oneline -n 1 HEAD)
else
die "You do not have the initial commit yet"
fi

if branch=$(git symbolic-ref -q HEAD)
then
branch=${branch#refs/heads/}
else
branch='(no branch)'
fi
msg=$(printf '%s: %s' "$branch" "$head")

# state of the index
i_tree=$(git write-tree) &&
i_commit=$(printf 'index on %s' "$msg" |
git commit-tree $i_tree -p $b_commit) ||
die "Cannot save the current index state"

# state of the working tree
w_tree=$( (
rm -f "$TMP-index" &&
cp -p ${GIT_INDEX_FILE-"$GIT_DIR/index"} "$TMP-index" &&
GIT_INDEX_FILE="$TMP-index" &&
export GIT_INDEX_FILE &&
git read-tree -m $i_tree &&
git add -u &&
git write-tree &&
rm -f "$TMP-index"
) ) ||
die "Cannot save the current worktree state"

# create the stash
if test -z "$stash_msg"
then
stash_msg=$(printf 'WIP on %s' "$msg")
else
stash_msg=$(printf 'On %s: %s' "$branch" "$stash_msg")
fi
w_commit=$(printf '%s\n' "$stash_msg" |
git commit-tree $w_tree -p $b_commit -p $i_commit) ||
die "Cannot record working tree state"

git update-ref -m "$stash_msg" $ref_stash $w_commit ||
die "Cannot save the current status"
printf >&2 'Saved "%s"\n' "$stash_msg"
}

have_stash () {
git rev-parse --verify $ref_stash >/dev/null 2>&1
}

list_stash () {
have_stash || return 0
git log --pretty=oneline -g "$@" $ref_stash |
sed -n -e 's/^[.0-9a-f]* refs\///p'
}

show_stash () {
flags=$(git rev-parse --no-revs --flags "$@")
if test -z "$flags"
then
flags=--stat
fi
s=$(git rev-parse --revs-only --no-flags --default $ref_stash "$@")

w_commit=$(git rev-parse --verify "$s") &&
b_commit=$(git rev-parse --verify "$s^") &&
git diff $flags $b_commit $w_commit
}

apply_stash () {
git diff-files --quiet ||
die 'Cannot restore on top of a dirty state'

unstash_index=
case "$1" in
--index)
unstash_index=t
shift
esac

# current index state
c_tree=$(git write-tree) ||
die 'Cannot apply a stash in the middle of a merge'

s=$(git rev-parse --revs-only --no-flags --default $ref_stash "$@") &&
w_tree=$(git rev-parse --verify "$s:") &&
b_tree=$(git rev-parse --verify "$s^:") ||
die "$*: no valid stashed state found"

test -z "$unstash_index" || {
git diff --binary $s^2^..$s^2 | git apply --cached
test $? -ne 0 &&
die 'Conflicts in index. Try without --index.'
unstashed_index_tree=$(git-write-tree) ||
die 'Could not save index tree'
git reset
}

eval "
GITHEAD_$w_tree='Stashed changes' &&
GITHEAD_$c_tree='Updated upstream' &&
GITHEAD_$b_tree='Version stash was based on' &&
export GITHEAD_$w_tree GITHEAD_$c_tree GITHEAD_$b_tree
"

if git-merge-recursive $b_tree -- $c_tree $w_tree
then
# No conflict
a="$TMP-added" &&
git diff --cached --name-only --diff-filter=A $c_tree >"$a" &&
git read-tree --reset $c_tree &&
git update-index --add --stdin <"$a" ||
die "Cannot unstage modified files"
git-status
rm -f "$a"
test -z "$unstash_index" || git read-tree $unstashed_index_tree
else
# Merge conflict; keep the exit status from merge-recursive
status=$?
test -z "$unstash_index" || echo 'Index was not unstashed.' >&2
exit $status
fi
}

# Main command set
case "$1" in
list)
shift
if test $# = 0
then
set x -n 10
shift
fi
list_stash "$@"
;;
show)
shift
show_stash "$@"
;;
apply)
shift
apply_stash "$@"
;;
clear)
clear_stash
;;
help | usage)
usage
;;
*)
if test $# -gt 0 && test "$1" = save
then
shift
fi
save_stash "$*" && git-reset --hard
;;
esac
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