Add 'about-filter' and 'repo.about-filter' options

These options can be used to execute a filter command on each about-page,
both top-level and for each repository (repo.about-filter can be used
to override the current about-filter).

Signed-off-by: Lars Hjemli <hjemli@gmail.com>

cgit.c

@@ -90,6 +90,8 @@ void config_cb(const char *name, const char *value)
 		ctx.cfg.cache_static_ttl = atoi(value);
 	else if (!strcmp(name, "cache-dynamic-ttl"))
 		ctx.cfg.cache_dynamic_ttl = atoi(value);
+	else if (!strcmp(name, "about-filter"))
+		ctx.cfg.about_filter = new_filter(value, 0);
 	else if (!strcmp(name, "commit-filter"))
 		ctx.cfg.commit_filter = new_filter(value, 0);
 	else if (!strcmp(name, "embedded"))
@@ -146,6 +148,8 @@ void config_cb(const char *name, const char *value)
 		ctx.repo->max_stats = cgit_find_stats_period(value, NULL);
 	else if (ctx.repo && !strcmp(name, "repo.module-link"))
 		ctx.repo->module_link= xstrdup(value);
+	else if (ctx.repo && !strcmp(name, "repo.about-filter"))
+		ctx.repo->about_filter = new_filter(value, 0);
 	else if (ctx.repo && !strcmp(name, "repo.commit-filter"))
 		ctx.repo->commit_filter = new_filter(value, 0);
 	else if (ctx.repo && !strcmp(name, "repo.source-filter"))

cgit.h

@@ -73,6 +73,7 @@ struct cgit_repo {
 	int enable_log_linecount;
 	int max_stats;
 	time_t mtime;
+	struct cgit_filter *about_filter;
 	struct cgit_filter *commit_filter;
 	struct cgit_filter *source_filter;
 };
@@ -185,6 +186,7 @@ struct cgit_config {
 	int summary_branches;
 	int summary_log;
 	int summary_tags;
+	struct cgit_filter *about_filter;
 	struct cgit_filter *commit_filter;
 	struct cgit_filter *source_filter;
 };

cgitrc.5.txt

@@ -16,6 +16,13 @@ lines, and lines starting with '#', are ignored.
 
 GLOBAL SETTINGS
 ---------------
+about-filter::
+	Specifies a command which will be invoked to format the content of
+	about pages (both top-level and for each repository). The command will
+	get the content of the about-file on its STDIN, and the STDOUT from the
+	command will be included verbatim on the about page. Default value:
+	none.
+
 agefile::
 	Specifies a path, relative to each repository path, which can be used
 	to specify the date and time of the youngest commit in the repository.
@@ -234,6 +241,9 @@ virtual-root::
 
 REPOSITORY SETTINGS
 -------------------
+repo.about-filter::
+	Override the default about-filter. Default value: <about-filter>.
+
 repo.clone-url::
 	A list of space-separated urls which can be used to clone this repo.
 	Default value: none.

shared.c

@@ -62,6 +62,7 @@ struct cgit_repo *cgit_add_repo(const char *url)
 	ret->module_link = ctx.cfg.module_link;
 	ret->readme = NULL;
 	ret->mtime = -1;
+	ret->about_filter = ctx.cfg.about_filter;
 	ret->commit_filter = ctx.cfg.commit_filter;
 	ret->source_filter = ctx.cfg.source_filter;
 	return ret;

ui-repolist.c

@@ -273,6 +273,11 @@ void cgit_print_repolist()
 
 void cgit_print_site_readme()
 {
-	if (ctx.cfg.root_readme)
+	if (!ctx.cfg.root_readme)
-		html_include(ctx.cfg.root_readme);
+		return;
+	if (ctx.cfg.about_filter)
+		cgit_open_filter(ctx.cfg.about_filter);
+	html_include(ctx.cfg.root_readme);
+	if (ctx.cfg.about_filter)
+		cgit_close_filter(ctx.cfg.about_filter);
 }

ui-summary.c

@@ -83,6 +83,10 @@ void cgit_print_repo_readme(char *path)
 	} else
 		tmp = ctx.repo->readme;
 	html("<div id='summary'>");
+	if (ctx.repo->about_filter)
+		cgit_open_filter(ctx.repo->about_filter);
 	html_include(tmp);
+	if (ctx.repo->about_filter)
+		cgit_close_filter(ctx.repo->about_filter);
 	html("</div>");
 }