Re: [cocci] How do I disable formatting for the "+"-side of a rule?

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

On Thu, Jul 14 2022, Julia Lawall wrote:

> On Thu, 14 Jul 2022, Ævar Arnfjörð Bjarmason wrote:
>
>> How do I stop coccinelle from turning my "{ 0 };\n" into
>> "{\n\t\t0\n\t};\n"?
>>
>> I haven't been able to find in the docs how to disable formatting on the
>> "+"-side of a rule. I have a rule like:
>>
>> 	@@
>> 	type T;
>> 	identifier I;
>> 	@@
>> 	- T I;
>> 	+ T I = { 0 };
>> 	... when != \( I \| &I \)
>> 	- memset(&I, 0, ...);
>>
>> Which produces the expected results as far as the patch is concerned:
>>
>> 	diff -u -p a/builtin/for-each-ref.c b/builtin/for-each-ref.c
>> 	--- a/builtin/for-each-ref.c
>> 	+++ b/builtin/for-each-ref.c
>> 	@@ -20,7 +20,9 @@ int cmd_for_each_ref(int argc, const cha
>> 	 	struct ref_sorting *sorting;
>> 	 	struct string_list sorting_options = STRING_LIST_INIT_DUP;
>> 	 	int maxcount = 0, icase = 0;
>> 	-	struct ref_array array;
>> 	+	struct ref_array array = {
>> 	+		0
>> 	+	};
>> 	 	struct ref_filter filter;
>> 	 	struct ref_format format = REF_FORMAT_INIT;
>> 	 	struct strbuf output = STRBUF_INIT;
>> 	@@ -52,7 +54,6 @@ int cmd_for_each_ref(int argc, const cha
>> 	 		OPT_END(),
>> 	 	};
>>
>> 	-	memset(&array, 0, sizeof(array));
>> 	 	memset(&filter, 0, sizeof(filter));
>>
>> 	 	format.format = "%(objectname) %(objecttype)\t%(refname)";
>>
>> But I'd like for that to be e.g.:
>>
>> 	struct ref_array array = { 0 };
>>
>> Which is a common idiom both in this codebase (git) and elsewhere.
>>
>> Usually I can find an answer in one of the coccinelle.git's *.cocci
>> files, the man page, or the grammar PDF, but in this case I've come up
>> blank...
>
> Try --smpl-spacing.  I'm not sure whether it affects newlines, though.

Thanks, no it just changes the spacing of the "=", i.e.:

	+       struct ref_array array = {

v.s. with --smpl-spacing:

	+       struct ref_array array<TAB>= {

(Or similar, I think it's aligning to the "=" above it?)

But the rest is the same, i.e. a \n after the "{", the "0" on its own
line etc.