[PATCH 9/9] builtin-mailinfo.c: use parse_options()

@@ -6,6 +6,7 @@
 #include "builtin.h"
 #include "utf8.h"
 #include "strbuf.h"
+#include "parse-options.h"
 
 static FILE *cmitmsg, *patchfile, *fin, *fout;
 

@@ -905,8 +906,10 @@ static int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
 	return 0;
 }
 
-static const char mailinfo_usage[] =
-	"git mailinfo [-k] [-u | --encoding=<encoding> | -n] msg patch <mail >info";
+static const char * const mailinfo_usage[] = {
+	"git mailinfo [-k] [-u | --encoding=<encoding> | -n] msg patch <mail >info",
+	NULL
+};
 
 int cmd_mailinfo(int argc, const char **argv, const char *prefix)
 {

@@ -920,22 +923,22 @@ int cmd_mailinfo(int argc, const char **argv, const char *prefix)
 	def_charset = (git_commit_encoding ? git_commit_encoding : "utf-8");
 	metainfo_charset = def_charset;
 
-	while (1 < argc && argv[1][0] == '-') {
-		if (!strcmp(argv[1], "-k"))
-			keep_subject = 1;
-		else if (!strcmp(argv[1], "-u"))
-			metainfo_charset = def_charset;
-		else if (!strcmp(argv[1], "-n"))
-			metainfo_charset = NULL;
-		else if (!prefixcmp(argv[1], "--encoding="))
-			metainfo_charset = argv[1] + 11;
-		else
-			usage(mailinfo_usage);
-		argc--; argv++;
-	}
+	const struct option options[] = {
+		OPT_BOOLEAN('k', NULL, &keep_subject,
+			    "keep subject, don't clean it up"),
+		OPT_SET_PTR('u', NULL, &metainfo_charset,
+			    "re-code in UTF-8", (intptr_t)def_charset),
+		OPT_SET_PTR('n', NULL, &metainfo_charset,
+			    "disable re-coding", (intptr_t)NULL),
+		OPT_STRING(0, "encoding", &metainfo_charset,
+			   "encoding", "override default encoding"),
+		OPT_END()
+	};
+
+	argc = parse_options(argc, argv, options, mailinfo_usage, 0);
 
-	if (argc != 3)
-		usage(mailinfo_usage);
+	if (argc != 2)
+		usage_with_options(mailinfo_usage, options);
 
-	return !!mailinfo(stdin, stdout, keep_subject, metainfo_charset, argv[1], argv[2]);
+	return !!mailinfo(stdin, stdout, keep_subject, metainfo_charset, argv[0], argv[1]);
 }