[RFC/PATCH 4/9] parse-options: add parse_opt_merge_filter()

[Karthik Nayak <karthik.188@gmail.com>]

Add 'parse_opt_merge_filter()' to parse '--merged' and '--no-merged'
options and write MACROS for the same.

Based-on-patch-by: Jeff King <peff@peff.net>
Mentored-by: Christian Couder <christian.couder@gmail.com>
Mentored-by: Matthieu Moy <matthieu.moy@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
---
 parse-options-cb.c | 22 ++++++++++++++++++++++
 parse-options.h    | 11 +++++++++++
 2 files changed, 33 insertions(+)

diff --git a/parse-options-cb.c b/parse-options-cb.c
index a4d294d..1969803 100644
--- a/parse-options-cb.c
+++ b/parse-options-cb.c
@@ -4,6 +4,7 @@
 #include "commit.h"
 #include "color.h"
 #include "string-list.h"
+#include "ref-filter.h"
 #include "sha1-array.h"
 
 /*----- some often used options -----*/
@@ -109,6 +110,27 @@ int parse_opt_points_at(const struct option *opt, const char *arg, int unset)
 	return 0;
 }
 
+int parse_opt_merge_filter(const struct option *opt, const char *arg, int unset)
+{
+	struct ref_filter *rf = opt->value;
+	unsigned char sha1[20];
+
+	rf->merge = opt->long_name[0] == 'n'
+		? REF_FILTER_MERGED_OMIT
+		: REF_FILTER_MERGED_INCLUDE;
+
+	if (!arg)
+		arg = "HEAD";
+	if (get_sha1(arg, sha1))
+		die(_("malformed object name %s"), arg);
+
+	rf->merge_commit = lookup_commit_reference_gently(sha1, 0);
+	if (!rf->merge_commit)
+		return opterror(opt, "must point to a commit", 0);
+
+	return 0;
+}
+
 int parse_opt_tertiary(const struct option *opt, const char *arg, int unset)
 {
 	int *target = opt->value;
diff --git a/parse-options.h b/parse-options.h
index 3ae16a1..7bcf0f3 100644
--- a/parse-options.h
+++ b/parse-options.h
@@ -221,6 +221,7 @@ extern int parse_opt_expiry_date_cb(const struct option *, const char *, int);
 extern int parse_opt_color_flag_cb(const struct option *, const char *, int);
 extern int parse_opt_verbosity_cb(const struct option *, const char *, int);
 extern int parse_opt_points_at(const struct option *, const char *, int);
+extern int parse_opt_merge_filter(const struct option *, const char *, int);
 extern int parse_opt_with_commit(const struct option *, const char *, int);
 extern int parse_opt_tertiary(const struct option *, const char *, int);
 extern int parse_opt_string_list(const struct option *, const char *, int);
@@ -243,5 +244,15 @@ extern int parse_opt_noop_cb(const struct option *, const char *, int);
 	OPT_COLOR_FLAG(0, "color", (var), (h))
 #define OPT_COLUMN(s, l, v, h) \
 	{ OPTION_CALLBACK, (s), (l), (v), N_("style"), (h), PARSE_OPT_OPTARG, parseopt_column_callback }
+#define OPT_NO_MERGED(filter, h) \
+	{ OPTION_CALLBACK, 0, "no-merged", (filter), N_("commit"), (h), \
+	  PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG, \
+	  parse_opt_merge_filter, (intptr_t) "HEAD" \
+	}
+#define OPT_MERGED(filter, h) \
+	{ OPTION_CALLBACK, 0, "merged", (filter), N_("commit"), (h), \
+	  PARSE_OPT_LASTARG_DEFAULT | PARSE_OPT_NONEG, \
+	  parse_opt_merge_filter, (intptr_t) "HEAD" \
+	}
 
 #endif
-- 
2.4.2