Re: [PATCH] fast-export: factor out print_oid()

["René Scharfe" <l.s.r@web.de>]

Am 13.08.20 um 17:18 schrieb Taylor Blau:
> On Thu, Aug 13, 2020 at 01:11:18PM +0200, René Scharfe wrote:
>> Simplify the output code by splitting it up and reducing duplication.
>> Reuse the logic for printing object IDs -- anonymized if needed -- by
>> moving it to its own function, print_oid().
>>
>> Signed-off-by: René Scharfe <l.s.r@web.de>
>> ---
>>  builtin/fast-export.c | 26 +++++++++++++++-----------
>>  1 file changed, 15 insertions(+), 11 deletions(-)
>>
>> diff --git a/builtin/fast-export.c b/builtin/fast-export.c
>> index 9f37895d4cf..49bb50634ab 100644
>> --- a/builtin/fast-export.c
>> +++ b/builtin/fast-export.c
>> @@ -420,6 +420,14 @@ static const char *anonymize_oid(const char *oid_hex)
>>  	return anonymize_str(&objs, generate_fake_oid, oid_hex, len, NULL);
>>  }
>>
>> +static void print_oid(const struct object_id *oid, int anonymize)
>> +{
>> +	const char *oid_hex = oid_to_hex(oid);
>> +	if (anonymize)
>> +		oid_hex = anonymize_oid(oid_hex);
>> +	fputs(oid_hex, stdout);
>> +}
>> +
>
> The fact that this calls fputs makes this patch (in my own opinion)
> noisier than it needs to be. This is because of all of the factoring out
> of the other printfs. I'd expect that this looks something more like:
>
>   -				       anonymize ?
>   -				       anonymize_oid(oid_to_hex(&spec->oid)) :
>   -				       oid_to_hex(&spec->oid));
>   +				       anonymize_oid(anonymize, &spec->oid));
>
> without moving around all of the other printf code.

Moving that part to anonymize_oid() would reduce the line count while
still getting rid of the duplication.  But the function would need a
new name.

-- >8 --
Subject: [PATCH v2] fast-export: deduplicate anonymization handling

Move the code for converting an object_id to a hexadecimal string and
for handling of the default (not anonymizing) case from its callers to
anonymize_oid() and consequently rename it to anonymize_oid_if_needed().
This reduces code duplication.

Suggested-by: Taylor Blau <me@ttaylorr.com>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: René Scharfe <l.s.r@web.de>
---
 builtin/fast-export.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/builtin/fast-export.c b/builtin/fast-export.c
index 9f37895d4cf..fcc3208727f 100644
--- a/builtin/fast-export.c
+++ b/builtin/fast-export.c
@@ -413,10 +413,13 @@ static char *generate_fake_oid(void *data)
 	return hash_to_hex_algop_r(hex, out, the_hash_algo);
 }

-static const char *anonymize_oid(const char *oid_hex)
+static const char *anonymize_oid_if_needed(const struct object_id *oid)
 {
 	static struct hashmap objs;
+	const char *oid_hex = oid_to_hex(oid);
 	size_t len = strlen(oid_hex);
+	if (!anonymize)
+		return oid_hex;
 	return anonymize_str(&objs, generate_fake_oid, oid_hex, len, NULL);
 }

@@ -476,9 +479,7 @@ static void show_filemodify(struct diff_queue_struct *q,
 			 */
 			if (no_data || S_ISGITLINK(spec->mode))
 				printf("M %06o %s ", spec->mode,
-				       anonymize ?
-				       anonymize_oid(oid_to_hex(&spec->oid)) :
-				       oid_to_hex(&spec->oid));
+				       anonymize_oid_if_needed(&spec->oid));
 			else {
 				struct object *object = lookup_object(the_repository,
 								      &spec->oid);
@@ -726,10 +727,7 @@ static void handle_commit(struct commit *commit, struct rev_info *rev,
 		if (mark)
 			printf(":%d\n", mark);
 		else
-			printf("%s\n",
-			       anonymize ?
-			       anonymize_oid(oid_to_hex(&obj->oid)) :
-			       oid_to_hex(&obj->oid));
+			printf("%s\n", anonymize_oid_if_needed(&obj->oid));
 		i++;
 	}

--
2.28.0