merge-recursive: separate out xdl_merge() interface.

diff --git a/git-bisect.sh b/git-bisect.sh
index 2e68e3dac0743ca3d7d8d3bd281adcbdaa904f72..85c374e21e7076cae8f186afe899437bda1ac770 100755 (executable)
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -168,27 +168,40 @@ bisect_write_good() {
 }
 
 bisect_next_check() {
-       next_ok=no
-        test -f "$GIT_DIR/refs/bisect/bad" &&
-       case "$(cd "$GIT_DIR" && echo refs/bisect/good-*)" in
-       refs/bisect/good-\*) ;;
-       *) next_ok=yes ;;
-       esac
-       case "$next_ok,$1" in
-       no,) false ;;
-       no,fail)
-           THEN=''
-           test -d "$GIT_DIR/refs/bisect" || {
-               echo >&2 'You need to start by "git bisect start".'
-               THEN='then '
-           }
-           echo >&2 'You '$THEN'need to give me at least one good' \
-               'and one bad revisions.'
-           echo >&2 '(You can use "git bisect bad" and' \
-               '"git bisect good" for that.)'
-           exit 1 ;;
+       missing_good= missing_bad=
+       git show-ref -q --verify refs/bisect/bad || missing_bad=t
+       test -n "$(git for-each-ref "refs/bisect/good-*")" || missing_good=t
+
+       case "$missing_good,$missing_bad,$1" in
+       ,,*)
+               : have both good and bad - ok
+               ;;
+       *,)
+               # do not have both but not asked to fail - just report.
+               false
+               ;;
+       t,,good)
+               # have bad but not good.  we could bisect although
+               # this is less optimum.
+               echo >&2 'Warning: bisecting only with a bad commit.'
+               if test -t 0
+               then
+                       printf >&2 'Are you sure [Y/n]? '
+                       case "$(read yesno)" in [Nn]*) exit 1 ;; esac
+               fi
+               : bisect without good...
+               ;;
        *)
-           true ;;
+               THEN=''
+               test -d "$GIT_DIR/refs/bisect" || {
+                       echo >&2 'You need to start by "git bisect start".'
+                       THEN='then '
+               }
+               echo >&2 'You '$THEN'need to give me at least one good' \
+                       'and one bad revisions.'
+               echo >&2 '(You can use "git bisect bad" and' \
+                       '"git bisect good" for that.)'
+               exit 1 ;;
        esac
 }
 
@@ -199,27 +212,32 @@ bisect_auto_next() {
 bisect_next() {
         case "$#" in 0) ;; *) usage ;; esac
        bisect_autostart
-       bisect_next_check fail
+       bisect_next_check good
+
        bad=$(git-rev-parse --verify refs/bisect/bad) &&
-       good=$(git-rev-parse --sq --revs-only --not \
-               $(cd "$GIT_DIR" && ls refs/bisect/good-*)) &&
-       rev=$(eval "git-rev-list --bisect $good $bad -- $(cat "$GIT_DIR/BISECT_NAMES")") || exit
-       if [ -z "$rev" ]; then
-           echo "$bad was both good and bad"
-           exit 1
+       good=$(git for-each-ref --format='^%(objectname)' \
+               "refs/bisect/good-*" | tr '[\012]' ' ') &&
+       eval="git-rev-list --bisect-vars $good $bad --" &&
+       eval="$eval $(cat "$GIT_DIR/BISECT_NAMES")" &&
+       eval=$(eval "$eval") &&
+       eval "$eval" || exit
+
+       if [ -z "$bisect_rev" ]; then
+               echo "$bad was both good and bad"
+               exit 1
        fi
-       if [ "$rev" = "$bad" ]; then
-           echo "$rev is first bad commit"
-           git-diff-tree --pretty $rev
-           exit 0
+       if [ "$bisect_rev" = "$bad" ]; then
+               echo "$bisect_rev is first bad commit"
+               git-diff-tree --pretty $bisect_rev
+               exit 0
        fi
-       nr=$(eval "git-rev-list $rev $good -- $(cat $GIT_DIR/BISECT_NAMES)" | wc -l) || exit
-       echo "Bisecting: $nr revisions left to test after this"
-       echo "$rev" > "$GIT_DIR/refs/heads/new-bisect"
+
+       echo "Bisecting: $bisect_nr revisions left to test after this"
+       echo "$bisect_rev" >"$GIT_DIR/refs/heads/new-bisect"
        git checkout -q new-bisect || exit
        mv "$GIT_DIR/refs/heads/new-bisect" "$GIT_DIR/refs/heads/bisect" &&
        GIT_DIR="$GIT_DIR" git-symbolic-ref HEAD refs/heads/bisect
-       git-show-branch "$rev"
+       git-show-branch "$bisect_rev"
 }
 
 bisect_visualize() {