filter-branch: Simplify parent computation.

We can use git rev-list --parents when we list the commits to rewrite.
It is not necessary to run git rev-list --parents for each commit in the
loop.

Signed-off-by: Johannes Sixt <johannes.sixt@telecom.at>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/git-filter-branch.sh b/git-filter-branch.sh
index efb8f2dbca9c347395557bdc178b8a256e266eb5..cb43b59740e763da922ac93cd1fbace64c07acab 100755 (executable)
--- a/git-filter-branch.sh
+++ b/git-filter-branch.sh
@@ -226,17 +226,6 @@ set_ident () {
        echo "[ -n \"\$GIT_${uid}_NAME\" ] || export GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\""
 }
 
-# list all parent's object names for a given commit
-get_parents () {
-       case "$filter_subdir" in
-       "")
-               git-rev-list -1 --parents "$1"
-               ;;
-       *)
-               git-rev-list -1 --parents "$1" -- "$filter_subdir"
-       esac | sed "s/^[0-9a-f]*//"
-}
-
 tempdir=.git-rewrite
 filter_env=
 filter_tree=
@@ -329,18 +318,19 @@ mkdir ../map # map old->new commit ids for rewriting parents
 
 case "$filter_subdir" in
 "")
-       git-rev-list --reverse --topo-order --default HEAD "$@"
+       git-rev-list --reverse --topo-order --default HEAD \
+               --parents "$@"
        ;;
 *)
-       git-rev-list --reverse --topo-order --default HEAD "$@" \
-               -- "$filter_subdir"
+       git-rev-list --reverse --topo-order --default HEAD \
+               --parents "$@" -- "$filter_subdir"
 esac > ../revs
 commits=$(cat ../revs | wc -l | tr -d " ")
 
 test $commits -eq 0 && die "Found nothing to rewrite"
 
 i=0
-while read commit; do
+while read commit parents; do
        i=$(($i+1))
        printf "$commit ($i/$commits) "
 
@@ -374,7 +364,7 @@ while read commit; do
        eval "$filter_index" < /dev/null
 
        parentstr=
-       for parent in $(get_parents $commit); do
+       for parent in $parents; do
                for reparent in $(map "$parent"); do
                        parentstr="$parentstr -p $reparent"
                done
@@ -389,7 +379,7 @@ while read commit; do
                tee ../map/$commit
 done <../revs
 
-src_head=$(tail -n 1 ../revs)
+src_head=$(tail -n 1 ../revs | sed -e 's/ .*//')
 target_head=$(head -n 1 ../map/$src_head)
 case "$target_head" in
 '')