revision.c: the "log" family, except for "show", takes committish

Add a field to setup_revision_opt structure and allow these callers
to tell the setup_revisions command parsing machinery that short SHA1
it encounters are meant to name committish.

This step does not go all the way to connect the setup_revisions()
to sha1_name.c yet.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin/log.c

@@ -363,6 +363,7 @@ int cmd_whatchanged(int argc, const char **argv, const char *prefix)
 	rev.simplify_history = 0;
 	memset(&opt, 0, sizeof(opt));
 	opt.def = "HEAD";
+	opt.revarg_opt = REVARG_COMMITTISH;
 	cmd_log_init(argc, argv, prefix, &rev, &opt);
 	if (!rev.diffopt.output_format)
 		rev.diffopt.output_format = DIFF_FORMAT_RAW;
@@ -543,6 +544,7 @@ int cmd_log(int argc, const char **argv, const char *prefix)
 	rev.always_show_header = 1;
 	memset(&opt, 0, sizeof(opt));
 	opt.def = "HEAD";
+	opt.revarg_opt = REVARG_COMMITTISH;
 	cmd_log_init(argc, argv, prefix, &rev, &opt);
 	return cmd_log_walk(&rev);
 }
@@ -1144,6 +1146,7 @@ int cmd_format_patch(int argc, const char **argv, const char *prefix)
 	rev.subject_prefix = fmt_patch_subject_prefix;
 	memset(&s_r_opt, 0, sizeof(s_r_opt));
 	s_r_opt.def = "HEAD";
+	s_r_opt.revarg_opt = REVARG_COMMITTISH;
 
 	if (default_attach) {
 		rev.mime_boundary = default_attach;

revision.c

@@ -1102,6 +1102,7 @@ int handle_revision_arg(const char *arg_, struct rev_info *revs, int flags, unsi
 	int local_flags;
 	const char *arg = arg_;
 	int cant_be_filename = revarg_opt & REVARG_CANNOT_BE_FILENAME;
+	unsigned get_sha1_flags = 0;
 
 	dotdot = strstr(arg, "..");
 	if (dotdot) {
@@ -1179,7 +1180,11 @@ int handle_revision_arg(const char *arg_, struct rev_info *revs, int flags, unsi
 		local_flags = UNINTERESTING;
 		arg++;
 	}
-	if (get_sha1_with_context(arg, 0, sha1, &oc))
+
+	if (revarg_opt & REVARG_COMMITTISH)
+		get_sha1_flags = GET_SHA1_COMMITTISH;
+
+	if (get_sha1_with_context(arg, get_sha1_flags, sha1, &oc))
 		return revs->ignore_missing ? 0 : -1;
 	if (!cant_be_filename)
 		verify_non_filename(revs->prefix, arg);
@@ -1707,7 +1712,9 @@ int setup_revisions(int argc, const char **argv, struct rev_info *revs, struct s
 
 	/* Second, deal with arguments and options */
 	flags = 0;
-	revarg_opt = seen_dashdash ? REVARG_CANNOT_BE_FILENAME : 0;
+	revarg_opt = opt ? opt->revarg_opt : 0;
+	if (seen_dashdash)
+		revarg_opt |= REVARG_CANNOT_BE_FILENAME;
 	read_from_stdin = 0;
 	for (left = i = 1; i < argc; i++) {
 		const char *arg = argv[i];

revision.h

@@ -183,6 +183,7 @@ struct setup_revision_opt {
 	const char *def;
 	void (*tweak)(struct rev_info *, struct setup_revision_opt *);
 	const char *submodule;
+	unsigned revarg_opt;
 };
 
 extern void init_revisions(struct rev_info *revs, const char *prefix);
@@ -191,6 +192,7 @@ extern void parse_revision_opt(struct rev_info *revs, struct parse_opt_ctx_t *ct
 				 const struct option *options,
 				 const char * const usagestr[]);
 #define REVARG_CANNOT_BE_FILENAME 01
+#define REVARG_COMMITTISH 02
 extern int handle_revision_arg(const char *arg, struct rev_info *revs, int flags, unsigned revarg_opt);
 
 extern int prepare_revision_walk(struct rev_info *revs);

t/t1512-rev-parse-disambiguation.sh

@@ -117,7 +117,7 @@ test_expect_failure 'rev-parse name1..name2 takes only commit-ishes on both ends
 	git rev-parse 000000000..
 '
 
-test_expect_failure 'git log takes only commit-ish' '
+test_expect_success 'git log takes only commit-ish' '
 	git log 000000000
 '