ui-summary: Pass filename to about-filter

This gives the about-filter API the same semantics as source-filter,
where the filter receives the filename so it can decide what to do next
with it.

While we're at it, plug a memory leak.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

4 files changed, 22 insertions, 8 deletions

diff --git a/cgit.c b/cgit.c
index 29e075d..04682be 100644
--- a/cgit.c
+++ b/cgit.c
@@ -37,10 +37,10 @@ static struct cgit_filter *new_filter(const char *cmd, filter_type filtertype)
 
         switch (filtertype) {
                 case SOURCE:
+                case ABOUT:
                         extra_args = 1;
                         break;
 
-                case ABOUT:
                 case COMMIT:
                 default:
                         extra_args = 0;
diff --git a/cgitrc.5.txt b/cgitrc.5.txt
index 8a0a9c9..ea0bbe7 100644
--- a/cgitrc.5.txt
+++ b/cgitrc.5.txt
@@ -542,9 +542,11 @@ config files, e.g. "repo.desc" becomes "desc".
 FILTER API
 ----------
 about filter::
-        This filter is given no arguments. The about text that is to be
-        filtered is available on standard input and the filtered text is
-        expected on standard output.
+        This filter is given a single parameter: the filename of the source
+        file to filter. The filter can use the filename to determine (for
+        example) the type of syntax to follow when formatting the readme file.
+        The about text that is to be filtered is available on standard input
+        and the filtered text is expected on standard output.
 
 commit filter::
         This filter is given no arguments. The commit message text that is to
diff --git a/ui-repolist.c b/ui-repolist.c
index 47ca997..2ab6e9e 100644
--- a/ui-repolist.c
+++ b/ui-repolist.c
@@ -332,9 +332,13 @@ void cgit_print_site_readme()
 {
         if (!ctx.cfg.root_readme)
                 return;
-        if (ctx.cfg.about_filter)
+        if (ctx.cfg.about_filter) {
+                ctx.cfg.about_filter->argv[1] = ctx.cfg.root_readme;
                 cgit_open_filter(ctx.cfg.about_filter);
+        }
         html_include(ctx.cfg.root_readme);
-        if (ctx.cfg.about_filter)
+        if (ctx.cfg.about_filter) {
                 cgit_close_filter(ctx.cfg.about_filter);
+                ctx.cfg.about_filter->argv[1] = NULL;
+        }
 }
diff --git a/ui-summary.c b/ui-summary.c
index abf914e..ffad4f2 100644
--- a/ui-summary.c
+++ b/ui-summary.c
@@ -98,6 +98,7 @@ void cgit_print_summary()
 void cgit_print_repo_readme(char *path)
 {
         char *slash, *tmp, *colon, *ref;
+        int free_filename = 0;
 
         if (!ctx.repo->readme || !(*ctx.repo->readme))
                 return;
@@ -134,6 +135,7 @@ void cgit_print_repo_readme(char *path)
                                 return;
                         slash = colon;
                 }
+                free_filename = 1;
                 tmp = xmalloc(slash - ctx.repo->readme + 1 + strlen(path) + 1);
                 strncpy(tmp, ctx.repo->readme, slash - ctx.repo->readme + 1);
                 strcpy(tmp + (slash - ctx.repo->readme + 1), path);
@@ -144,13 +146,19 @@ void cgit_print_repo_readme(char *path)
          * filesystem, while applying the about-filter.
          */
         html("<div id='summary'>");
-        if (ctx.repo->about_filter)
+        if (ctx.repo->about_filter) {
+                ctx.repo->about_filter->argv[1] = tmp;
                 cgit_open_filter(ctx.repo->about_filter);
+        }
         if (ref)
                 cgit_print_file(tmp, ref);
         else
                 html_include(tmp);
-        if (ctx.repo->about_filter)
+        if (ctx.repo->about_filter) {
                 cgit_close_filter(ctx.repo->about_filter);
+                ctx.repo->about_filter->argv[1] = NULL;
+        }
         html("</div>");
+        if (free_filename)
+                free(tmp);
 }