Re: [PATCH v6 4/6] builtin/tag: add --format argument for tag -v

[Junio C Hamano <gitster@pobox.com>]

Junio C Hamano <gitster@pobox.com> writes:

> santiago@nyu.edu writes:
>
>> @@ -428,9 +443,12 @@ int cmd_tag(int argc, const char **argv, const char *prefix)
>>  	if (filter.merge_commit)
>>  		die(_("--merged and --no-merged option are only allowed with -l"));
>>  	if (cmdmode == 'd')
>> -		return for_each_tag_name(argv, delete_tag);
>> -	if (cmdmode == 'v')
>> -		return for_each_tag_name(argv, verify_tag);
>> +		return for_each_tag_name(argv, delete_tag, NULL);
>> +	if (cmdmode == 'v') {
>> +		if (format)
>> +			verify_ref_format(format);
>> +		return for_each_tag_name(argv, verify_tag, format);
>> +	}
>
> This triggers:
>
>     builtin/tag.c: In function 'cmd_tag':
>     builtin/tag.c:451:3: error: passing argument 3 of
>     'for_each_tag_name' discards 'const' qualifier from pointer target type [-Werror]
>        return for_each_tag_name(argv, verify_tag, format);
>
> Either for-each-tag-name's new parameter needs to be typed
> correctly, or the type of the "format" variable needs to be updated.

Squashing the following into this commit solves this issue with the
former approach.  The lines it touches are all from 4/6 and I view
all of it as general improvement, including type correctness and
code formatting.

diff --git a/builtin/tag.c b/builtin/tag.c
index f81273a85a..fbb85ba3dc 100644
--- a/builtin/tag.c
+++ b/builtin/tag.c
@@ -66,10 +66,10 @@ static int list_tags(struct ref_filter *filter, struct ref_sorting *sorting, con
 }
 
 typedef int (*each_tag_name_fn)(const char *name, const char *ref,
-				const unsigned char *sha1, void *cb_data);
+				const unsigned char *sha1, const void *cb_data);
 
 static int for_each_tag_name(const char **argv, each_tag_name_fn fn,
-		void *cb_data)
+			     const void *cb_data)
 {
 	const char **p;
 	char ref[PATH_MAX];
@@ -95,7 +95,7 @@ static int for_each_tag_name(const char **argv, each_tag_name_fn fn,
 }
 
 static int delete_tag(const char *name, const char *ref,
-				const unsigned char *sha1, void *cb_data)
+		      const unsigned char *sha1, const void *cb_data)
 {
 	if (delete_ref(ref, sha1, 0))
 		return 1;
@@ -104,10 +104,10 @@ static int delete_tag(const char *name, const char *ref,
 }
 
 static int verify_tag(const char *name, const char *ref,
-				const unsigned char *sha1, void *cb_data)
+		      const unsigned char *sha1, const void *cb_data)
 {
 	int flags;
-	char *fmt_pretty = cb_data;
+	const char *fmt_pretty = cb_data;
 	flags = GPG_VERIFY_VERBOSE;
 
 	if (fmt_pretty)