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#!/bin/sh
#
# Copyright (c) 2005 Linus Torvalds
# Copyright (c) 2005 Junio C Hamano
#
. git-sh-setup || die "Not a git archive"
case "$0" in
*-revert* )
test -t 0 && edit=-e
me=revert ;;
*-cherry-pick* )
edit=
me=cherry-pick ;;
* )
die "What are you talking about?" ;;
esac
usage () {
case "$me" in
cherry-pick)
die "usage git $me [-n] [-r] <commit-ish>"
;;
revert)
die "usage git $me [-n] <commit-ish>"
;;
esac
}
no_commit= replay=
while case "$#" in 0) break ;; esac
do
case "$1" in
-n|--n|--no|--no-|--no-c|--no-co|--no-com|--no-comm|\
--no-commi|--no-commit)
no_commit=t
;;
-e|--e|--ed|--edi|--edit)
edit=-e
;;
-n|--n|--no|--no-|--no-e|--no-ed|--no-edi|--no-edit)
edit=
;;
-r|--r|--re|--rep|--repl|--repla|--replay)
replay=t
;;
-*)
usage
;;
*)
break
;;
esac
shift
done
test "$me,$replay" = "revert,t" && usage
case "$no_commit" in
t)
# We do not intend to commit immediately. We just want to
# merge the differences in.
head=$(git-write-tree) ||
die "Your index file is unmerged."
;;
*)
head=$(git-rev-parse --verify HEAD) ||
die "You do not have a valid HEAD"
files=$(git-diff-index --cached --name-only $head) || exit
if [ "$files" ]; then
die "Dirty index: cannot $me (dirty: $files)"
fi
;;
esac
rev=$(git-rev-parse --verify "$@") &&
commit=$(git-rev-parse --verify "$rev^0") ||
die "Not a single commit $@"
prev=$(git-rev-parse --verify "$commit^1" 2>/dev/null) ||
die "Cannot run $me a root commit"
git-rev-parse --verify "$commit^2" >/dev/null 2>&1 &&
die "Cannot run $me a multi-parent commit."
# "commit" is an existing commit. We would want to apply
# the difference it introduces since its first parent "prev"
# on top of the current HEAD if we are cherry-pick. Or the
# reverse of it if we are revert.
case "$me" in
revert)
git-rev-list --pretty=oneline --max-count=1 $commit |
sed -e '
s/^[^ ]* /Revert "/
s/$/"/'
echo
echo "This reverts $commit commit."
test "$rev" = "$commit" ||
echo "(original 'git revert' arguments: $@)"
base=$commit next=$prev
;;
cherry-pick)
pick_author_script='
/^author /{
h
s/^author \([^<]*\) <[^>]*> .*$/\1/
s/'\''/'\''\'\'\''/g
s/.*/GIT_AUTHOR_NAME='\''&'\''/p
g
s/^author [^<]* <\([^>]*\)> .*$/\1/
s/'\''/'\''\'\'\''/g
s/.*/GIT_AUTHOR_EMAIL='\''&'\''/p
g
s/^author [^<]* <[^>]*> \(.*\)$/\1/
s/'\''/'\''\'\'\''/g
s/.*/GIT_AUTHOR_DATE='\''&'\''/p
q
}'
set_author_env=`git-cat-file commit "$commit" |
LANG=C LC_ALL=C sed -ne "$pick_author_script"`
eval "$set_author_env"
export GIT_AUTHOR_NAME
export GIT_AUTHOR_EMAIL
export GIT_AUTHOR_DATE
git-cat-file commit $commit | sed -e '1,/^$/d'
case "$replay" in
'')
echo "(cherry picked from $commit commit)"
test "$rev" = "$commit" ||
echo "(original 'git cherry-pick' arguments: $@)"
;;
esac
base=$prev next=$commit
;;
esac >.msg
# This three way merge is an interesting one. We are at
# $head, and would want to apply the change between $commit
# and $prev on top of us (when reverting), or the change between
# $prev and $commit on top of us (when cherry-picking or replaying).
echo >&2 "First trying simple merge strategy to $me."
git-read-tree -m -u $base $head $next &&
result=$(git-write-tree 2>/dev/null) || {
echo >&2 "Simple $me fails; trying Automatic $me."
git-merge-index -o git-merge-one-file -a || {
echo >&2 "Automatic $me failed. After fixing it up,"
echo >&2 "you can use \"git commit -F .msg\""
case "$me" in
cherry-pick)
echo >&2 "You may choose to use the following when making"
echo >&2 "the commit:"
echo >&2 "$set_author_env"
esac
exit 1
}
result=$(git-write-tree) || exit
}
echo >&2 "Finished one $me."
# If we are cherry-pick, and if the merge did not result in
# hand-editing, we will hit this commit and inherit the original
# author date and name.
# If we are revert, or if our cherry-pick results in a hand merge,
# we had better say that the current user is responsible for that.
case "$no_commit" in
'')
git-commit -n -F .msg $edit
rm -f .msg
;;
esac
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