From: Pranit Bauva <[email protected]>

With the conversion of `bisect_auto_next()` in previous commit,
`bisect_start()` has been successfully ported to C.

Add the subcommands to `git bisect--helper` and call it from
git-bisect.sh.

Remove `bisect_start()` shell method and call `git bisect--helper 
--bisect-start` subcommand
from git-bisect.sh.

Removing the part about signals as we are not doing anything
anymore to trap signals. While at it, "trap" is changed to
"handle". As "trap" is a reference to the shell "trap" builtin,
which isn't used anymore.

Mentored-by: Christian Couder <[email protected]>
Mentored-by: Johannes Schindelin <[email protected]>
Signed-off-by: Pranit Bauva <[email protected]>
Signed-off-by: Tanushree Tumane <[email protected]>
---
 builtin/bisect--helper.c | 29 +++++++++++++++++++++++++++--
 git-bisect.sh            | 29 +++--------------------------
 2 files changed, 30 insertions(+), 28 deletions(-)

diff --git a/builtin/bisect--helper.c b/builtin/bisect--helper.c
index 2f19924471..d538cb04fb 100644
--- a/builtin/bisect--helper.c
+++ b/builtin/bisect--helper.c
@@ -697,9 +697,9 @@ static int bisect_start(struct bisect_terms *terms, int 
no_checkout,
                return -1;
 
        /*
-        * In case of mistaken revs or checkout error, or signals received,
+        * In case of mistaken revs or checkout error,
         * "bisect_auto_next" below may exit or misbehave.
-        * We have to trap this to be able to clean up using
+        * We have to handle this to be able to clean up using
         * "bisect_clean_state".
         */
 
@@ -743,6 +743,31 @@ static int bisect_start(struct bisect_terms *terms, int 
no_checkout,
        string_list_clear(&states, 0);
        strbuf_release(&start_head);
        strbuf_release(&bisect_names);
+       if (res)
+               return res;
+
+       res = bisect_auto_next(terms, NULL);
+       /*
+        * In case of mistaken revs or checkout error, or signals received,
+        * "bisect_auto_next" below may exit or misbehave.
+        * We have to trap this to be able to clean up using
+        * "bisect_clean_state".
+        * return code -11 is special code that indicates special success.
+        *      -> bisect_start()
+        *         . res = bisect_auto_next()
+        *          -> bisect_auto_next()
+        *             . return bisect_next()
+        *             -> bisect_next()
+        *                . res = bisect_next_all()
+        *                -> bisect_next_all()
+        *                   . res = check_good_are_ancestors_of_bad()
+        *                   -> check_good_are_ancestors_of_bad()
+        *                      . res = check_merge_bases()
+        *                      -> check_merge_bases()
+        *                         . res = -11
+        */
+       if (res && res != -11)
+               bisect_clean_state();
        return res;
 }
 
diff --git a/git-bisect.sh b/git-bisect.sh
index 7531b74708..fec527e1ef 100755
--- a/git-bisect.sh
+++ b/git-bisect.sh
@@ -63,35 +63,13 @@ bisect_autostart() {
                        [Nn]*)
                                exit ;;
                        esac
-                       bisect_start
+                       git bisect--helper --bisect-start
                else
                        exit 1
                fi
        }
 }
 
-bisect_start() {
-       git bisect--helper --bisect-start $@ || exit
-
-       #
-       # Change state.
-       # In case of mistaken revs or checkout error, or signals received,
-       # "bisect_auto_next" below may exit or misbehave.
-       # We have to trap this to be able to clean up using
-       # "bisect_clean_state".
-       #
-       trap 'git bisect--helper --bisect-clean-state' 0
-       trap 'exit 255' 1 2 3 15
-
-       #
-       # Check if we can proceed to the next bisect state.
-       #
-       get_terms
-       git bisect--helper --bisect-auto-next || exit
-
-       trap '-' 0
-}
-
 bisect_skip() {
        all=''
        for arg in "$@"
@@ -184,8 +162,7 @@ bisect_replay () {
                get_terms
                case "$command" in
                start)
-                       cmd="bisect_start $rev"
-                       eval "$cmd" ;;
+                       eval "git bisect--helper --bisect-start $rev" ;;
                "$TERM_GOOD"|"$TERM_BAD"|skip)
                        git bisect--helper --bisect-write "$command" "$rev" 
"$TERM_GOOD" "$TERM_BAD" || exit;;
                terms)
@@ -284,7 +261,7 @@ case "$#" in
        help)
                git bisect -h ;;
        start)
-               bisect_start "$@" ;;
+               git bisect--helper --bisect-start "$@" ;;
        bad|good|new|old|"$TERM_BAD"|"$TERM_GOOD")
                bisect_state "$cmd" "$@" ;;
        skip)
-- 
gitgitgadget

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