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mailmap: drop debugging code

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There's some debugging code in mailmap.c which is only compiled if you
manually tweak the source to set DEBUG_MAILMAP. When it's not set, the
fallback noop uses static inline functions; we couldn't use macros here
because one of the functions is variadic (and variadic macros were
forbidden back then, but aren't now). As a result, this triggers
a -Wunused-parameter warning.

We have a few options here:

  1. Leave it be. Just mark it as UNUSED, or switch to a variadic macro.

  2. Assume the debugging code is useful, compile it always, and trigger
     it with a run-time flag (e.g., with a trace key). This is pretty
     easy to do, and carries a pretty small runtime cost.

  3. Assume the debugging is not very useful, and just rip it out. This
     matches what we did with a similar case in 69c5f17f11 (attr: drop
     DEBUG_ATTR code, 2022-10-06).

The debugging flag has been mentioned only three times on the list.
Once, when it was added in 2009:

  https://lore.kernel.org/git/cover.1234102794.git.marius@trolltech.com/

In 2013, when somebody fixed some compilation errors in the conditional
code (presumably because they used it while making other changes):

  https://lore.kernel.org/git/1373871253-96480-1-git-send-email-sunshine@sunshineco.com/

And finally it seemed to have been useful to somebody in 2020:

  https://lore.kernel.org/git/87eejswql6.fsf@evledraar.gmail.com/

So it's not totally without value. On the other hand, it's not likely to
be useful to non-developers (and certainly isn't if you have to
recompile). And using a debugger or adding your own inspection code is
likely to be as useful. So I've just dropped the code entirely here.

Note that we do still have to mark a few parameters unused in callback
functions which are passed to string_list_clear_func(). Those get an
extra pointer with the string being cleared, which we previously fed to
the debugging code.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2023-03-17 15:16:26 -04:00 committed by Junio C Hamano
parent 950264636c
commit 910d07a861
1 changed files with 3 additions and 39 deletions
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42
mailmap.c
View File

@ -3,16 +3,6 @@
#include "mailmap.h"
#include "object-store.h"
#define DEBUG_MAILMAP 0
#if DEBUG_MAILMAP
#define debug_mm(...) fprintf(stderr, __VA_ARGS__)
#define debug_str(X) ((X) ? (X) : "(none)")
#else
__attribute__((format (printf, 1, 2)))
static inline void debug_mm(const char *format, ...) {}
static inline const char *debug_str(const char *s) { return s; }
#endif
const char *git_mailmap_file;
const char *git_mailmap_blob;
@ -30,23 +20,17 @@ struct mailmap_entry {
struct string_list namemap;
};
static void free_mailmap_info(void *p, const char *s)
static void free_mailmap_info(void *p, const char *s UNUSED)
{
struct mailmap_info *mi = (struct mailmap_info *)p;
debug_mm("mailmap: -- complex: '%s' -> '%s' <%s>\n",
s, debug_str(mi->name), debug_str(mi->email));
free(mi->name);
free(mi->email);
free(mi);
}
static void free_mailmap_entry(void *p, const char *s)
static void free_mailmap_entry(void *p, const char *s UNUSED)
{
struct mailmap_entry *me = (struct mailmap_entry *)p;
debug_mm("mailmap: removing entries for <%s>, with %"PRIuMAX" sub-entries\n",
s, (uintmax_t)me->namemap.nr);
debug_mm("mailmap: - simple: '%s' <%s>\n",
debug_str(me->name), debug_str(me->email));
free(me->name);
free(me->email);
@ -93,8 +77,6 @@ static void add_mapping(struct string_list *map,
}
if (!old_name) {
debug_mm("mailmap: adding (simple) entry for '%s'\n", old_email);
/* Replace current name and new email for simple entry */
if (new_name) {
free(me->name);
@ -106,15 +88,10 @@ static void add_mapping(struct string_list *map,
}
} else {
struct mailmap_info *mi = xcalloc(1, sizeof(struct mailmap_info));
debug_mm("mailmap: adding (complex) entry for '%s'\n", old_email);
mi->name = xstrdup_or_null(new_name);
mi->email = xstrdup_or_null(new_email);
string_list_insert(&me->namemap, old_name)->util = mi;
}
debug_mm("mailmap: '%s' <%s> -> '%s' <%s>\n",
debug_str(old_name), old_email,
debug_str(new_name), debug_str(new_email));
}
static char *parse_name_and_email(char *buffer, char **name,
@ -250,11 +227,8 @@ int read_mailmap(struct string_list *map)
void clear_mailmap(struct string_list *map)
{
debug_mm("mailmap: clearing %"PRIuMAX" entries...\n",
(uintmax_t)map->nr);
map->strdup_strings = 1;
string_list_clear_func(map, free_mailmap_entry);
debug_mm("mailmap: cleared\n");
}
/*
@ -315,10 +289,6 @@ int map_user(struct string_list *map,
struct string_list_item *item;
struct mailmap_entry *me;
debug_mm("map_user: map '%.*s' <%.*s>\n",
(int)*namelen, debug_str(*name),
(int)*emaillen, debug_str(*email));
item = lookup_prefix(map, *email, *emaillen);
if (item) {
me = (struct mailmap_entry *)item->util;
@ -336,10 +306,8 @@ int map_user(struct string_list *map,
}
if (item) {
struct mailmap_info *mi = (struct mailmap_info *)item->util;
if (mi->name == NULL && mi->email == NULL) {
debug_mm("map_user: -- (no simple mapping)\n");
if (mi->name == NULL && mi->email == NULL)
return 0;
}
if (mi->email) {
*email = mi->email;
*emaillen = strlen(*email);
@ -348,11 +316,7 @@ int map_user(struct string_list *map,
*name = mi->name;
*namelen = strlen(*name);
}
debug_mm("map_user: to '%.*s' <%.*s>\n",
(int)*namelen, debug_str(*name),
(int)*emaillen, debug_str(*email));
return 1;
}
debug_mm("map_user: --\n");
return 0;
}