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filter: introduce "filter type" prefix

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This allows different filter implementations to be specified in the
configuration file.  Currently only "exec" is supported, but it may now
be specified either with or without the "exec:" prefix.

Signed-off-by: John Keeping <john@keeping.me.uk>
This commit is contained in:
John Keeping 2014-01-12 17:13:53 +00:00 committed by Jason A. Donenfeld
parent 7bd90b8048
commit 4bb87cbf17
2 changed files with 40 additions and 2 deletions
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9
cgitrc.5.txt
View File

@ -557,6 +557,15 @@ config files, e.g. "repo.desc" becomes "desc".
FILTER API
----------
By default, filters are separate processes that are executed each time they
are needed. Alternative technologies may be used by prefixing the filter
specification with the relevant string; available values are:
'exec:'::
The default "one process per filter" mode.
Parameters are provided to filters as follows.
about filter::
This filter is given a single parameter: the filename of the source
file to filter. The filter can use the filename to determine (for

31
filter.c
View File

@ -64,7 +64,7 @@ done:
static void fprintf_exec_filter(struct cgit_filter *base, FILE *f, const char *prefix)
{
struct cgit_exec_filter *filter = (struct cgit_exec_filter *) base;
fprintf(f, "%s%s\n", prefix, filter->cmd);
fprintf(f, "%sexec:%s\n", prefix, filter->cmd);
}
int cgit_open_filter(struct cgit_filter *filter, ...)
@ -125,10 +125,39 @@ static struct cgit_filter *new_exec_filter(const char *cmd, filter_type filterty
return &f->base;
}
static const struct {
const char *prefix;
struct cgit_filter *(*ctor)(const char *cmd, filter_type filtertype);
} filter_specs[] = {
{ "exec", new_exec_filter },
};
struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
{
char *colon;
int i;
size_t len;
if (!cmd || !cmd[0])
return NULL;
colon = strchr(cmd, ':');
len = colon - cmd;
/*
* In case we're running on Windows, don't allow a single letter before
* the colon.
*/
if (len == 1)
colon = NULL;
/* If no prefix is given, exec filter is the default. */
if (!colon)
return new_exec_filter(cmd, filtertype);
for (i = 0; i < ARRAY_SIZE(filter_specs); i++) {
if (len == strlen(filter_specs[i].prefix) &&
!strncmp(filter_specs[i].prefix, cmd, len))
return filter_specs[i].ctor(colon + 1, filtertype);
}
die("Invalid filter type: %.*s", (int) len, cmd);
}