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userdiff: add and use struct external_diff

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Wrap the string specifying the external diff command in a new struct to
simplify adding attributes, which the next patch will do.

Make sure external_diff() still returns NULL if neither the environment
variable GIT_EXTERNAL_DIFF nor the configuration option diff.external is
set, to continue allowing its use in a boolean context.

Use a designated initializer for the default builtin userdiff driver to
adjust to the type change of the second struct member.  Spelling out
only the non-zero members improves readability as a nice side-effect.

No functional change intended.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
René Scharfe 2024-06-09 09:39:08 +02:00 committed by Junio C Hamano
parent 33be6cf51a
commit 54443bbfc3
3 changed files with 24 additions and 18 deletions
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32
diff.c
View file

@ -57,7 +57,7 @@ static int diff_color_moved_ws_default;
static int diff_context_default = 3;
static int diff_interhunk_context_default;
static char *diff_word_regex_cfg;
static char *external_diff_cmd_cfg;
static struct external_diff external_diff_cfg;
static char *diff_order_file_cfg;
int diff_auto_refresh_index = 1;
static int diff_mnemonic_prefix;
@ -431,7 +431,7 @@ int git_diff_ui_config(const char *var, const char *value,
return 0;
}
if (!strcmp(var, "diff.external"))
return git_config_string(&external_diff_cmd_cfg, var, value);
return git_config_string(&external_diff_cfg.cmd, var, value);
if (!strcmp(var, "diff.wordregex"))
return git_config_string(&diff_word_regex_cfg, var, value);
if (!strcmp(var, "diff.orderfile"))
@ -548,18 +548,20 @@ static char *quote_two(const char *one, const char *two)
return strbuf_detach(&res, NULL);
}
static const char *external_diff(void)
static const struct external_diff *external_diff(void)
{
static const char *external_diff_cmd = NULL;
static struct external_diff external_diff_env, *external_diff_ptr;
static int done_preparing = 0;
if (done_preparing)
return external_diff_cmd;
external_diff_cmd = xstrdup_or_null(getenv("GIT_EXTERNAL_DIFF"));
if (!external_diff_cmd)
external_diff_cmd = external_diff_cmd_cfg;
return external_diff_ptr;
external_diff_env.cmd = xstrdup_or_null(getenv("GIT_EXTERNAL_DIFF"));
if (external_diff_env.cmd)
external_diff_ptr = &external_diff_env;
else if (external_diff_cfg.cmd)
external_diff_ptr = &external_diff_cfg;
done_preparing = 1;
return external_diff_cmd;
return external_diff_ptr;
}
/*
@ -4375,7 +4377,7 @@ static void add_external_diff_name(struct repository *r,
* infile2 infile2-sha1 infile2-mode [ rename-to ]
*
*/
static void run_external_diff(const char *pgm,
static void run_external_diff(const struct external_diff *pgm,
const char *name,
const char *other,
struct diff_filespec *one,
@ -4386,7 +4388,7 @@ static void run_external_diff(const char *pgm,
struct child_process cmd = CHILD_PROCESS_INIT;
struct diff_queue_struct *q = &diff_queued_diff;
strvec_push(&cmd.args, pgm);
strvec_push(&cmd.args, pgm->cmd);
strvec_push(&cmd.args, name);
if (one && two) {
@ -4512,7 +4514,7 @@ static void fill_metainfo(struct strbuf *msg,
}
}
static void run_diff_cmd(const char *pgm,
static void run_diff_cmd(const struct external_diff *pgm,
const char *name,
const char *other,
const char *attr_path,
@ -4530,8 +4532,8 @@ static void run_diff_cmd(const char *pgm,
if (o->flags.allow_external || !o->ignore_driver_algorithm)
drv = userdiff_find_by_path(o->repo->index, attr_path);
if (o->flags.allow_external && drv && drv->external)
pgm = drv->external;
if (o->flags.allow_external && drv && drv->external.cmd)
pgm = &drv->external;
if (msg) {
/*
@ -4597,7 +4599,7 @@ static void strip_prefix(int prefix_length, const char **namep, const char **oth
static void run_diff(struct diff_filepair *p, struct diff_options *o)
{
const char *pgm = external_diff();
const struct external_diff *pgm = external_diff();
struct strbuf msg;
struct diff_filespec *one = p->one;
struct diff_filespec *two = p->two;

4
userdiff.c
View file

@ -333,7 +333,7 @@ PATTERNS("scheme",
"|([^][)(}{[ \t])+"),
PATTERNS("tex", "^(\\\\((sub)*section|chapter|part)\\*{0,1}\\{.*)$",
"\\\\[a-zA-Z@]+|\\\\.|([a-zA-Z0-9]|[^\x01-\x7f])+"),
{ "default", NULL, NULL, -1, { NULL, 0 } },
{ .name = "default", .binary = -1 },
};
#undef PATTERNS
#undef IPATTERN
@ -445,7 +445,7 @@ int userdiff_config(const char *k, const char *v)
if (!strcmp(type, "binary"))
return parse_tristate(&drv->binary, k, v);
if (!strcmp(type, "command"))
return git_config_string(&drv->external, k, v);
return git_config_string(&drv->external.cmd, k, v);
if (!strcmp(type, "textconv"))
return git_config_string(&drv->textconv, k, v);
if (!strcmp(type, "cachetextconv"))

6
userdiff.h
View file

@ -11,9 +11,13 @@ struct userdiff_funcname {
int cflags;
};
struct external_diff {
char *cmd;
};
struct userdiff_driver {
const char *name;
char *external;
struct external_diff external;
char *algorithm;
int binary;
struct userdiff_funcname funcname;