static int git_diff_driver_builtin(
git_diff_driver **out,
git_diff_driver_registry *reg,
const char *driver_name)
{
int error = 0;
git_diff_driver_definition *ddef = NULL;
git_diff_driver *drv = NULL;
size_t namelen, idx;
for (idx = 0; idx < ARRAY_SIZE(builtin_defs); ++idx) {
if (!strcasecmp(driver_name, builtin_defs[idx].name)) {
ddef = &builtin_defs[idx];
break;
}
}
if (!ddef)
goto done;
namelen = strlen(ddef->name);
drv = git__calloc(1, sizeof(git_diff_driver) + namelen + 1);
GITERR_CHECK_ALLOC(drv);
drv->type = DIFF_DRIVER_PATTERNLIST;
memcpy(drv->name, ddef->name, namelen);
if (ddef->fns &&
(error = diff_driver_add_patterns(
drv, ddef->fns, ddef->flags | REG_EXTENDED)) < 0)
goto done;
if (ddef->words &&
(error = regcomp(
&drv->word_pattern, ddef->words, ddef->flags | REG_EXTENDED)))
{
error = giterr_set_regex(&drv->word_pattern, error);
goto done;
}
git_strmap_insert(reg->drivers, drv->name, drv, error);
if (error > 0)
error = 0;
done:
if (error && drv)
git_diff_driver_free(drv);
else
*out = drv;
return error;
}
static int build_regex(regex_t *regex, const char *pattern)
{
int error;
if (*pattern == '\0') {
giterr_set(GITERR_REGEX, "Empty pattern");
return -1;
}
error = regcomp(regex, pattern, REG_EXTENDED);
if (!error)
return 0;
giterr_set_regex(regex, error);
regfree(regex);
return -1;
}
static int diff_driver_add_patterns(
git_diff_driver *drv, const char *regex_str, int regex_flags)
{
int error = 0;
const char *scan, *end;
git_diff_driver_pattern *pat = NULL;
git_buf buf = GIT_BUF_INIT;
for (scan = regex_str; scan; scan = end) {
/* get pattern to fill in */
if ((pat = git_array_alloc(drv->fn_patterns)) == NULL) {
error = -1;
break;
}
pat->flags = regex_flags;
if (*scan == '!') {
pat->flags |= REG_NEGATE;
++scan;
}
if ((end = strchr(scan, '\n')) != NULL) {
error = git_buf_set(&buf, scan, end - scan);
end++;
} else {
error = git_buf_sets(&buf, scan);
}
if (error < 0)
break;
if ((error = regcomp(&pat->re, buf.ptr, regex_flags)) < 0) {
/* if regex fails to compile, warn? fail? */
error = giterr_set_regex(&pat->re, error);
regfree(&pat->re);
break;
}
}
if (error && pat != NULL)
(void)git_array_pop(drv->fn_patterns); /* release last item */
git_buf_free(&buf);
return error;
}
static int build_regex(regex_t *regex, const char *pattern)
{
int error;
if (*pattern == '\0') {
giterr_set(GITERR_REGEX, "empty pattern");
return GIT_EINVALIDSPEC;
}
error = p_regcomp(regex, pattern, REG_EXTENDED);
if (!error)
return 0;
error = giterr_set_regex(regex, error);
regfree(regex);
return error;
}
static int git_diff_driver_load(
git_diff_driver **out, git_repository *repo, const char *driver_name)
{
int error = 0;
git_diff_driver_registry *reg;
git_diff_driver *drv = NULL;
size_t namelen = strlen(driver_name);
khiter_t pos;
git_config *cfg;
git_buf name = GIT_BUF_INIT;
const git_config_entry *ce;
bool found_driver = false;
if ((reg = git_repository_driver_registry(repo)) == NULL)
return -1;
pos = git_strmap_lookup_index(reg->drivers, driver_name);
if (git_strmap_valid_index(reg->drivers, pos)) {
*out = git_strmap_value_at(reg->drivers, pos);
return 0;
}
drv = git__calloc(1, sizeof(git_diff_driver) + namelen + 1);
GITERR_CHECK_ALLOC(drv);
drv->type = DIFF_DRIVER_AUTO;
memcpy(drv->name, driver_name, namelen);
/* if you can't read config for repo, just use default driver */
if (git_repository_config_snapshot(&cfg, repo) < 0) {
giterr_clear();
goto done;
}
if ((error = git_buf_printf(&name, "diff.%s.binary", driver_name)) < 0)
goto done;
switch (git_config__get_bool_force(cfg, name.ptr, -1)) {
case true:
/* if diff.<driver>.binary is true, just return the binary driver */
*out = &global_drivers[DIFF_DRIVER_BINARY];
goto done;
case false:
/* if diff.<driver>.binary is false, force binary checks off */
/* but still may have custom function context patterns, etc. */
drv->binary_flags = GIT_DIFF_FORCE_TEXT;
found_driver = true;
break;
default:
/* diff.<driver>.binary unspecified or "auto", so just continue */
break;
}
/* TODO: warn if diff.<name>.command or diff.<name>.textconv are set */
git_buf_truncate(&name, namelen + strlen("diff.."));
git_buf_put(&name, "xfuncname", strlen("xfuncname"));
if ((error = git_config_get_multivar_foreach(
cfg, name.ptr, NULL, diff_driver_xfuncname, drv)) < 0) {
if (error != GIT_ENOTFOUND)
goto done;
giterr_clear(); /* no diff.<driver>.xfuncname, so just continue */
}
git_buf_truncate(&name, namelen + strlen("diff.."));
git_buf_put(&name, "funcname", strlen("funcname"));
if ((error = git_config_get_multivar_foreach(
cfg, name.ptr, NULL, diff_driver_funcname, drv)) < 0) {
if (error != GIT_ENOTFOUND)
goto done;
giterr_clear(); /* no diff.<driver>.funcname, so just continue */
}
/* if we found any patterns, set driver type to use correct callback */
if (git_array_size(drv->fn_patterns) > 0) {
drv->type = DIFF_DRIVER_PATTERNLIST;
found_driver = true;
}
git_buf_truncate(&name, namelen + strlen("diff.."));
git_buf_put(&name, "wordregex", strlen("wordregex"));
if ((error = git_config__lookup_entry(&ce, cfg, name.ptr, false)) < 0)
goto done;
if (!ce || !ce->value)
/* no diff.<driver>.wordregex, so just continue */;
else if (!(error = regcomp(&drv->word_pattern, ce->value, REG_EXTENDED)))
found_driver = true;
else {
/* TODO: warn about bad regex instead of failure */
error = giterr_set_regex(&drv->word_pattern, error);
goto done;
}
/* TODO: look up diff.<driver>.algorithm to turn on minimal / patience
* diff in drv->other_flags
*/
/* if no driver config found at all, fall back on AUTO driver */
if (!found_driver)
goto done;
/* store driver in registry */
git_strmap_insert(reg->drivers, drv->name, drv, error);
if (error < 0)
goto done;
error = 0;
*out = drv;
done:
git_buf_free(&name);
git_config_free(cfg);
if (!*out) {
int error2 = git_diff_driver_builtin(out, reg, driver_name);
if (!error)
error = error2;
}
if (drv && drv != *out)
git_diff_driver_free(drv);
return error;
}