help.c: remove common category behavior from drop_prefix() behavior

Change the behavior of the "git" prefix stripping for CAT_guide so that we don't try to strip the "git-" prefix in that case. We should be stripping either "git" or "git-" depending on the category. This change makes it easier to add extra "category" conditions in subsequent commits. Before this we'd in principle strip a "git-" prefix from a "guide" in command-list.txt, in practice we have no such entry there. As we don't have any entry that looks like "git-foo" in command-list.txt this changes nothing in practice, but it makes the intent of the code clearer. In that hypothetical case we'd now strip it down to "-foo", not "foo". When this code was added in cfb22a02ab5 (help: use command-list.h for common command list, 2018-05-10) the only entries in command-list.txt that didn't begin with "git-" were "gitweb" and "gitk". Then when the "guides" special-case was added in 1b81d8cb19d (help: use command-list.txt for the source of guides, 2018-05-20) we had the various "git" (not "git-") prefixed "guide" entries, which the "CAT_guide" case handles. Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Ævar Arnfjörð Bjarmason committed Aug 4, 2022 at 18:28 UTC 936b8eb6c83fa2773b489dc365ab0cce47ba83f3
1 file changed +5 -4
help.c
+5 -4
@@ -44,16 +44,17 @@ static struct category_description main_categories[] = {
44 static const char *drop_prefix(const char *name, uint32_t category)
45 {
46 const char *new_name;
47 - const char *prefix = NULL;
47 + const char *prefix;
48
49 - if (skip_prefix(name, "git-", &new_name))
50 - return new_name;
49 switch (category) {
50 case CAT_guide:
51 prefix = "git";
52 break;
53 + default:
54 + prefix = "git-";
55 + break;
56 }
56 - if (prefix && skip_prefix(name, prefix, &new_name))
57 + if (skip_prefix(name, prefix, &new_name))
58 return new_name;
59
60 return name;