filter: add support for email filter

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

cgit.c

@@ -89,6 +89,8 @@ static void repo_config(struct cgit_repo *repo, const char *name, const char *va
 			repo->commit_filter = cgit_new_filter(value, COMMIT);
 		else if (!strcmp(name, "source-filter"))
 			repo->source_filter = cgit_new_filter(value, SOURCE);
+		else if (!strcmp(name, "email-filter"))
+			repo->email_filter = cgit_new_filter(value, EMAIL);
 	}
 }
 
@@ -188,6 +190,8 @@ static void config_cb(const char *name, const char *value)
 		ctx.cfg.about_filter = cgit_new_filter(value, ABOUT);
 	else if (!strcmp(name, "commit-filter"))
 		ctx.cfg.commit_filter = cgit_new_filter(value, COMMIT);
+	else if (!strcmp(name, "email-filter"))
+		ctx.cfg.email_filter = cgit_new_filter(value, EMAIL);
 	else if (!strcmp(name, "embedded"))
 		ctx.cfg.embedded = atoi(value);
 	else if (!strcmp(name, "max-atom-items"))
@@ -711,6 +715,8 @@ static void print_repo(FILE *f, struct cgit_repo *repo)
 		cgit_fprintf_filter(repo->commit_filter, f, "repo.commit-filter=");
 	if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
 		cgit_fprintf_filter(repo->source_filter, f, "repo.source-filter=");
+	if (repo->email_filter && repo->email_filter != ctx.cfg.email_filter)
+		cgit_fprintf_filter(repo->email_filter, f, "repo.email-filter=");
 	if (repo->snapshots != ctx.cfg.snapshots) {
 		char *tmp = build_snapshot_setting(repo->snapshots);
 		fprintf(f, "repo.snapshots=%s\n", tmp ? tmp : "");

cgit.h

@@ -53,7 +53,7 @@ typedef void (*filepair_fn)(struct diff_filepair *pair);
 typedef void (*linediff_fn)(char *line, int len);
 
 typedef enum {
-	ABOUT, COMMIT, SOURCE
+	ABOUT, COMMIT, SOURCE, EMAIL
 } filter_type;
 
 struct cgit_filter {
@@ -99,6 +99,7 @@ struct cgit_repo {
 	struct cgit_filter *about_filter;
 	struct cgit_filter *commit_filter;
 	struct cgit_filter *source_filter;
+	struct cgit_filter *email_filter;
 	struct string_list submodules;
 };
 
@@ -250,6 +251,7 @@ struct cgit_config {
 	struct cgit_filter *about_filter;
 	struct cgit_filter *commit_filter;
 	struct cgit_filter *source_filter;
+	struct cgit_filter *email_filter;
 };
 
 struct cgit_page {

cgitrc.5.txt

@@ -117,6 +117,14 @@ css::
 	Url which specifies the css document to include in all cgit pages.
 	Default value: "/cgit.css".
 
+email-filter::
+	Specifies a command which will be invoked to format names and email
+	address of committers, authors, and taggers, as represented in various
+	places throughout the cgit interface. This command will receive an
+	email address as its only command line argument, and the text to
+	format on STDIN. It is to write the formatted text back out onto
+	STDOUT. Default value: none. See also: "FILTER API".
+
 embedded::
 	Flag which, when set to "1", will make cgit generate a html fragment
 	suitable for embedding in other html pages. Default value: none. See
@@ -457,6 +465,10 @@ repo.defbranch::
 repo.desc::
 	The value to show as repository description. Default value: none.
 
+repo.email-filter::
+	Override the default email-filter. Default value: none. See also:
+	"enable-filter-overrides". See also: "FILTER API".
+
 repo.enable-commit-graph::
 	A flag which can be used to disable the global setting
 	`enable-commit-graph'. Default value: none.
@@ -607,6 +619,12 @@ commit filter::
 	be filtered is available on standard input and the filtered text is
 	expected on standard output.
 
+email filter::
+	This filter is given a single parameter: the email address of the
+	relevent user. The filter will then receive the text string to format
+	on standard input and is expected to write to standard output the
+	formatted text to be included in the page.
+
 source 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

filter.c

@@ -37,10 +37,12 @@ void cgit_cleanup_filters(void)
 	reap_filter(ctx.cfg.about_filter);
 	reap_filter(ctx.cfg.commit_filter);
 	reap_filter(ctx.cfg.source_filter);
+	reap_filter(ctx.cfg.email_filter);
 	for (i = 0; i < cgit_repolist.count; ++i) {
 		reap_filter(cgit_repolist.repos[i].about_filter);
 		reap_filter(cgit_repolist.repos[i].commit_filter);
 		reap_filter(cgit_repolist.repos[i].source_filter);
+		reap_filter(cgit_repolist.repos[i].email_filter);
 	}
 }
 
@@ -403,6 +405,7 @@ struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
 		colon = NULL;
 
 	switch (filtertype) {
+		case EMAIL:
 		case SOURCE:
 		case ABOUT:
 			argument_count = 1;

shared.c

@@ -71,6 +71,7 @@ struct cgit_repo *cgit_add_repo(const char *url)
 	ret->about_filter = ctx.cfg.about_filter;
 	ret->commit_filter = ctx.cfg.commit_filter;
 	ret->source_filter = ctx.cfg.source_filter;
+	ret->email_filter = ctx.cfg.email_filter;
 	ret->clone_url = ctx.cfg.clone_url;
 	ret->submodules.strdup_strings = 1;
 	return ret;

ui-commit.c

@@ -44,20 +44,24 @@ void cgit_print_commit(char *hex, const char *prefix)
 	cgit_print_diff_ctrls();
 	html("<table summary='commit info' class='commit-info'>\n");
 	html("<tr><th>author</th><td>");
+	cgit_open_filter(ctx.repo->email_filter, info->author_email);
 	html_txt(info->author);
 	if (!ctx.cfg.noplainemail) {
 		html(" ");
 		html_txt(info->author_email);
 	}
+	cgit_close_filter(ctx.repo->email_filter);
 	html("</td><td class='right'>");
 	cgit_print_date(info->author_date, FMT_LONGDATE, ctx.cfg.local_time);
 	html("</td></tr>\n");
 	html("<tr><th>committer</th><td>");
+	cgit_open_filter(ctx.repo->email_filter, info->committer_email);
 	html_txt(info->committer);
 	if (!ctx.cfg.noplainemail) {
 		html(" ");
 		html_txt(info->committer_email);
 	}
+	cgit_close_filter(ctx.repo->email_filter);
 	html("</td><td class='right'>");
 	cgit_print_date(info->committer_date, FMT_LONGDATE, ctx.cfg.local_time);
 	html("</td></tr>\n");

ui-log.c

@@ -168,7 +168,9 @@ static void print_commit(struct commit *commit, struct rev_info *revs)
 			 sha1_to_hex(commit->object.sha1), ctx.qry.vpath, 0);
 	show_commit_decorations(commit);
 	html("</td><td>");
+	cgit_open_filter(ctx.repo->email_filter, info->author_email);
 	html_txt(info->author);
+	cgit_close_filter(ctx.repo->email_filter);
 
 	if (revs->graph) {
 		html("</td><td>");

ui-refs.c

@@ -77,7 +77,9 @@ static int print_branch(struct refinfo *ref)
 	if (ref->object->type == OBJ_COMMIT) {
 		cgit_commit_link(info->subject, NULL, NULL, name, NULL, NULL, 0);
 		html("</td><td>");
+		cgit_open_filter(ctx.repo->email_filter, info->author_email);
 		html_txt(info->author);
+		cgit_close_filter(ctx.repo->email_filter);
 		html("</td><td colspan='2'>");
 		cgit_print_age(info->commit->date, -1, NULL);
 	} else {
@@ -154,10 +156,15 @@ static int print_tag(struct refinfo *ref)
 		cgit_object_link(obj);
 	html("</td><td>");
 	if (info) {
-		if (info->tagger)
+		if (info->tagger) {
+			cgit_open_filter(ctx.repo->email_filter, info->tagger_email);
 			html_txt(info->tagger);
+			cgit_close_filter(ctx.repo->email_filter);
+		}
 	} else if (ref->object->type == OBJ_COMMIT) {
+		cgit_open_filter(ctx.repo->email_filter, ref->commit->author_email);
 		html_txt(ref->commit->author);
+		cgit_close_filter(ctx.repo->email_filter);
 	}
 	html("</td><td colspan='2'>");
 	if (info) {

ui-tag.c

@@ -77,11 +77,13 @@ void cgit_print_tag(char *revname)
 		}
 		if (info->tagger) {
 			html("<tr><td>tagged by</td><td>");
+			cgit_open_filter(ctx.repo->email_filter, info->tagger_email);
 			html_txt(info->tagger);
 			if (info->tagger_email && !ctx.cfg.noplainemail) {
 				html(" ");
 				html_txt(info->tagger_email);
 			}
+			cgit_close_filter(ctx.repo->email_filter);
 			html("</td></tr>\n");
 		}
 		html("<tr><td>tagged object</td><td class='sha1'>");