rebase: support --autosquash without -i

The rebase --autosquash option is quietly ignored when used without
--interactive (apart from preventing preemptive fast-forwarding and
triggering conflicts with apply backend options).

Change that to support --autosquash without --interactive, by dropping
its restriction to REBASE_INTERACTIVE_EXCPLICIT mode. When used this
way, auto-squashing is done without opening the todo list editor.

Drop the -i requirement from the --autosquash description, and amend
t3415-rebase-autosquash.sh to test the option and the rebase.autoSquash
config variable with and without -i.

Signed-off-by: Andy Koppe <andy.koppe@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: ak2

Documentation/git-rebase.txt

@@ -592,7 +592,7 @@ See also INCOMPATIBLE OPTIONS below.
 	When the commit log message begins with "squash! ..." or "fixup! ..."
 	or "amend! ...", and there is already a commit in the todo list that
 	matches the same `...`, automatically modify the todo list of
-	`rebase -i`, so that the commit marked for squashing comes right after
+	`rebase`, so that the commit marked for squashing comes right after
 	the commit to be modified, and change the action of the moved commit
 	from `pick` to `squash` or `fixup` or `fixup -C` respectively. A commit
 	matches the `...` if the commit subject matches, or if the `...` refers

builtin/rebase.c

@@ -710,10 +710,8 @@ static int run_specific_rebase(struct rebase_options *opts)
 	if (opts->type == REBASE_MERGE) {
 		/* Run sequencer-based rebase */
 		setenv("GIT_CHERRY_PICK_HELP", resolvemsg, 1);
-		if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT)) {
+		if (!(opts->flags & REBASE_INTERACTIVE_EXPLICIT))
 			setenv("GIT_SEQUENCE_EDITOR", ":", 1);
-			opts->autosquash = 0;
-		}
 		if (opts->gpg_sign_opt) {
 			/* remove the leading "-S" */
 			char *tmp = xstrdup(opts->gpg_sign_opt + 2);

t/t3415-rebase-autosquash.sh

@@ -43,7 +43,7 @@ test_auto_fixup () {
 
 	git tag $1 &&
 	test_tick &&
-	git rebase $2 -i HEAD^^^ &&
+	git rebase $2 HEAD^^^ &&
 	git log --oneline >actual &&
 	if test -n "$no_squash"
 	then
@@ -61,15 +61,24 @@ test_auto_fixup () {
 }
 
 test_expect_success 'auto fixup (option)' '
-	test_auto_fixup final-fixup-option --autosquash
+	test_auto_fixup fixup-option --autosquash &&
+	test_auto_fixup fixup-option-i "--autosquash -i"
 '
 
-test_expect_success 'auto fixup (config)' '
+test_expect_success 'auto fixup (config true)' '
 	git config rebase.autosquash true &&
-	test_auto_fixup final-fixup-config-true &&
+	test_auto_fixup ! fixup-config-true &&
+	test_auto_fixup fixup-config-true-i -i &&
 	test_auto_fixup ! fixup-config-true-no --no-autosquash &&
+	test_auto_fixup ! fixup-config-true-i-no "-i --no-autosquash"
+'
+
+test_expect_success 'auto fixup (config false)' '
 	git config rebase.autosquash false &&
-	test_auto_fixup ! final-fixup-config-false
+	test_auto_fixup ! fixup-config-false &&
+	test_auto_fixup ! fixup-config-false-i -i &&
+	test_auto_fixup fixup-config-false-yes --autosquash &&
+	test_auto_fixup fixup-config-false-i-yes "-i --autosquash"
 '
 
 test_auto_squash () {
@@ -87,7 +96,7 @@ test_auto_squash () {
 	git commit -m "squash! first" -m "extra para for first" &&
 	git tag $1 &&
 	test_tick &&
-	git rebase $2 -i HEAD^^^ &&
+	git rebase $2 HEAD^^^ &&
 	git log --oneline >actual &&
 	if test -n "$no_squash"
 	then
@@ -105,15 +114,24 @@ test_auto_squash () {
 }
 
 test_expect_success 'auto squash (option)' '
-	test_auto_squash final-squash --autosquash
+	test_auto_squash squash-option --autosquash &&
+	test_auto_squash squash-option-i "--autosquash -i"
 '
 
-test_expect_success 'auto squash (config)' '
+test_expect_success 'auto squash (config true)' '
 	git config rebase.autosquash true &&
-	test_auto_squash final-squash-config-true &&
+	test_auto_squash ! squash-config-true &&
+	test_auto_squash squash-config-true-i -i &&
 	test_auto_squash ! squash-config-true-no --no-autosquash &&
+	test_auto_squash ! squash-config-true-i-no "-i --no-autosquash"
+'
+
+test_expect_success 'auto squash (config false)' '
 	git config rebase.autosquash false &&
-	test_auto_squash ! final-squash-config-false
+	test_auto_squash ! squash-config-false &&
+	test_auto_squash ! squash-config-false-i -i &&
+	test_auto_squash squash-config-false-yes --autosquash &&
+	test_auto_squash squash-config-false-i-yes "-i --autosquash"
 '
 
 test_expect_success 'misspelled auto squash' '