[PATCH v4 06/10] cat-file: make --batch-all-objects a CMDMODE

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

The usage of OPT_CMDMODE() in "cat-file"[1] was added in parallel with
the development of[3] the --batch-all-objects option[4], so we've
since grown[5] checks that it can't be combined with other command
modes, when it should just be made a top-level command-mode
instead. It doesn't combine with --filters, --textconv etc.

By giving parse_options() information about what options are mutually
exclusive with one another we can get the die() message being removed
here for free, we didn't even use that removed message in some cases,
e.g. for both of:

    --batch-all-objects --textconv
    --batch-all-objects --filters

We'd take the "goto usage" in the "if (opt)" branch, and never reach
the previous message. Now we'll emit e.g.:

    $ git cat-file --batch-all-objects --filters
    error: option `filters' is incompatible with --batch-all-objects

1. b48158ac94c (cat-file: make the options mutually exclusive, 2015-05-03)
2. https://lore.kernel.org/git/xmqqtwspgusf.fsf@gitster.dls.corp.google.com/
3. https://lore.kernel.org/git/20150622104559.GG14475@peff.net/
4. 6a951937ae1 (cat-file: add --batch-all-objects option, 2015-06-22)
5. 321459439e1 (cat-file: support --textconv/--filters in batch mode, 2016-09-09)

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---
 builtin/cat-file.c  | 25 +++++++++++--------------
 t/t1006-cat-file.sh |  7 ++-----
 2 files changed, 13 insertions(+), 19 deletions(-)

diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index 6d0f645301b..87356208134 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -674,6 +674,8 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
 			    N_("for blob objects, run textconv on object's content"), 'c'),
 		OPT_CMDMODE(0, "filters", &opt,
 			    N_("for blob objects, run filters on object's content"), 'w'),
+		OPT_CMDMODE(0, "batch-all-objects", &opt,
+			    N_("show all objects with --batch or --batch-check"), 'b'),
 		OPT_STRING(0, "path", &force_path, N_("blob"),
 			   N_("use a specific path for --textconv/--filters")),
 		OPT_BOOL(0, "allow-unknown-type", &unknown_type,
@@ -689,8 +691,6 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
 			batch_option_callback),
 		OPT_BOOL(0, "follow-symlinks", &batch.follow_symlinks,
 			 N_("follow in-tree symlinks (used with --batch or --batch-check)")),
-		OPT_BOOL(0, "batch-all-objects", &batch.all_objects,
-			 N_("show all objects with --batch or --batch-check")),
 		OPT_BOOL(0, "unordered", &batch.unordered,
 			 N_("do not order --batch-all-objects output")),
 		OPT_END()
@@ -699,30 +699,27 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
 	git_config(git_cat_file_config, NULL);
 
 	batch.buffer_output = -1;
-	argc = parse_options(argc, argv, prefix, options, usage, 0);
 
-	if (opt) {
+	argc = parse_options(argc, argv, prefix, options, usage, 0);
+	if (argc && batch.enabled)
+		usage_with_options(usage, options);
+	if (opt == 'b') {
+		batch.all_objects = 1;
+	} else if (opt) {
 		if (batch.enabled && (opt == 'c' || opt == 'w'))
 			batch.cmdmode = opt;
 		else if (argc == 1)
 			obj_name = argv[0];
 		else
 			usage_with_options(usage, options);
-	}
-	if (!opt && !batch.enabled) {
+	} else if (!opt && !batch.enabled) {
 		if (argc == 2) {
 			exp_type = argv[0];
 			obj_name = argv[1];
 		} else
 			usage_with_options(usage, options);
-	}
-	if (batch.enabled) {
-		if (batch.cmdmode != opt || argc)
-			usage_with_options(usage, options);
-		if (batch.cmdmode && batch.all_objects)
-			die("--batch-all-objects cannot be combined with "
-			    "--textconv nor with --filters");
-	}
+	} else if (batch.enabled && batch.cmdmode != opt)
+		usage_with_options(usage, options);
 
 	if ((batch.follow_symlinks || batch.all_objects) && !batch.enabled) {
 		usage_with_options(usage, options);
diff --git a/t/t1006-cat-file.sh b/t/t1006-cat-file.sh
index fc9191c1b94..ebec2061d25 100755
--- a/t/t1006-cat-file.sh
+++ b/t/t1006-cat-file.sh
@@ -14,7 +14,8 @@ for switches in \
 	'-p -t' \
 	'-t -s' \
 	'-s --textconv' \
-	'--textconv --filters'
+	'--textconv --filters' \
+	'--batch-all-objects -e'
 do
 	test_expect_success "usage: cmdmode $switches" '
 		test_cmdmode_usage git cat-file $switches
@@ -41,10 +42,6 @@ do
 	test_expect_success "usage: $opt requires another option" '
 		test_expect_code 129 git cat-file $opt
 	'
-
-	test_expect_failure "usage: incompatible options: --batch-all-objects with $opt" '
-		test_incompatible_usage git cat-file --batch-all-objects $opt
-	'
 done
 
 for opt in $short_modes
-- 
2.34.1.926.g895e15e0c0c