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#!/bin/sh
USAGE="[-a] [-r] [-m] [-t] [-n] [-b <newname>] <name>"
LONG_USAGE="git-resurrect attempts to find traces of a branch tip
called <name>, and tries to resurrect it. Currently, the reflog is
searched for checkout messages, and with -r also merge messages. With
-m and -t, the history of all refs is scanned for Merge <name> into
other/Merge <other> into <name> (respectively) commit subjects, which
is rather slow but allows you to resurrect other people's topic
branches."
OPTIONS_KEEPDASHDASH=
OPTIONS_STUCKLONG=
OPTIONS_SPEC="\
git resurrect $USAGE
--
b,branch= save branch as <newname> instead of <name>
a,all same as -l -r -m -t
k,keep-going full rev-list scan (instead of first match)
l,reflog scan reflog for checkouts (enabled by default)
r,reflog-merges scan for merges recorded in reflog
m,merges scan for merges into other branches (slow)
t,merge-targets scan for merges of other branches into <name>
n,dry-run don't recreate the branch"
. git-sh-setup
search_reflog () {
sed -ne 's~^\([^ ]*\) .* checkout: moving from '"$1"' .*~\1~p' \
< "$GIT_DIR"/logs/HEAD
}
search_reflog_merges () {
git rev-parse $(
sed -ne 's~^[^ ]* \([^ ]*\) .* merge '"$1"':.*~\1^2~p' \
< "$GIT_DIR"/logs/HEAD
)
}
oid_pattern=$(git hash-object --stdin </dev/null | sed -e 's/./[0-9a-f]/g')
search_merges () {
git rev-list --all --grep="Merge branch '$1'" \
--pretty=tformat:"%P %s" |
sed -ne "/^$oid_pattern \($oid_pattern\) Merge .*/ {s//\1/p;$early_exit}"
}
search_merge_targets () {
git rev-list --all --grep="Merge branch '[^']*' into $branch\$" \
--pretty=tformat:"%H %s" --all |
sed -ne "/^\($oid_pattern\) Merge .*/ {s//\1/p;$early_exit} "
}
dry_run=
early_exit=q
scan_reflog=t
scan_reflog_merges=
scan_merges=
scan_merge_targets=
new_name=
while test "$#" != 0; do
case "$1" in
-b|--branch)
shift
new_name="$1"
;;
-n|--dry-run)
dry_run=t
;;
--no-dry-run)
dry_run=
;;
-k|--keep-going)
early_exit=
;;
--no-keep-going)
early_exit=q
;;
-m|--merges)
scan_merges=t
;;
--no-merges)
scan_merges=
;;
-l|--reflog)
scan_reflog=t
;;
--no-reflog)
scan_reflog=
;;
-r|--reflog_merges)
scan_reflog_merges=t
;;
--no-reflog_merges)
scan_reflog_merges=
;;
-t|--merge-targets)
scan_merge_targets=t
;;
--no-merge-targets)
scan_merge_targets=
;;
-a|--all)
scan_reflog=t
scan_reflog_merges=t
scan_merges=t
scan_merge_targets=t
;;
--)
shift
break
;;
*)
usage
;;
esac
shift
done
test "$#" = 1 || usage
all_strategies="$scan_reflog$scan_reflog_merges$scan_merges$scan_merge_targets"
if test -z "$all_strategies"; then
die "must enable at least one of -lrmt"
fi
branch="$1"
test -z "$new_name" && new_name="$branch"
if test ! -z "$scan_reflog"; then
if test -r "$GIT_DIR"/logs/HEAD; then
candidates="$(search_reflog $branch)"
else
die 'reflog scanning requested, but' \
'$GIT_DIR/logs/HEAD not readable'
fi
fi
if test ! -z "$scan_reflog_merges"; then
if test -r "$GIT_DIR"/logs/HEAD; then
candidates="$candidates $(search_reflog_merges $branch)"
else
die 'reflog scanning requested, but' \
'$GIT_DIR/logs/HEAD not readable'
fi
fi
if test ! -z "$scan_merges"; then
candidates="$candidates $(search_merges $branch)"
fi
if test ! -z "$scan_merge_targets"; then
candidates="$candidates $(search_merge_targets $branch)"
fi
candidates="$(git rev-parse $candidates | sort -u)"
if test -z "$candidates"; then
hint=
test "z$all_strategies" != "ztttt" \
&& hint=" (maybe try again with -a)"
die "no candidates for $branch found$hint"
fi
echo "** Candidates for $branch **"
for cmt in $candidates; do
git --no-pager log --pretty=tformat:"%ct:%h [%cr] %s" --abbrev-commit -1 $cmt
done \
| sort -n | cut -d: -f2-
newest="$(git rev-list -1 $candidates)"
if test ! -z "$dry_run"; then
printf "** Most recent: "
git --no-pager log -1 --pretty=tformat:"%h %s" $newest
elif ! git rev-parse --verify --quiet $new_name >/dev/null; then
printf "** Restoring $new_name to "
git --no-pager log -1 --pretty=tformat:"%h %s" $newest
git branch $new_name $newest
else
printf "Most recent: "
git --no-pager log -1 --pretty=tformat:"%h %s" $newest
echo "** $new_name already exists, doing nothing"
fi