Add atom-support

This enables a page which generates atom feeds for the current branch and
path, heavily inspired by the atom-support in gitweb.

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

Makefile

@@ -55,6 +55,7 @@ OBJECTS += configfile.o
 OBJECTS += html.o
 OBJECTS += parsing.o
 OBJECTS += shared.o
+OBJECTS += ui-atom.o
 OBJECTS += ui-blob.o
 OBJECTS += ui-commit.o
 OBJECTS += ui-diff.o

cgit.h

@@ -24,6 +24,7 @@
  */
 #define FMT_LONGDATE "%Y-%m-%d %H:%M:%S (%Z)"
 #define FMT_SHORTDATE "%Y-%m-%d"
+#define FMT_ATOMDATE "%Y-%m-%dT%H:%M:%SZ"
 
 
 /*

cmd.c

@@ -10,6 +10,7 @@
 #include "cmd.h"
 #include "cache.h"
 #include "ui-shared.h"
+#include "ui-atom.h"
 #include "ui-blob.h"
 #include "ui-commit.h"
 #include "ui-diff.h"
@@ -22,6 +23,11 @@
 #include "ui-tag.h"
 #include "ui-tree.h"
 
+static void atom_fn(struct cgit_context *ctx)
+{
+	cgit_print_atom(ctx->qry.head, ctx->qry.path, 10);
+}
+
 static void about_fn(struct cgit_context *ctx)
 {
 	if (ctx->repo)
@@ -102,6 +108,7 @@ static void tree_fn(struct cgit_context *ctx)
 struct cgit_cmd *cgit_get_cmd(struct cgit_context *ctx)
 {
 	static struct cgit_cmd cmds[] = {
+		def_cmd(atom, 1, 0),
 		def_cmd(about, 0, 1),
 		def_cmd(blob, 1, 0),
 		def_cmd(commit, 1, 1),

ui-atom.c

@@ -0,0 +1,129 @@
+/* ui-atom.c: functions for atom feeds
+ *
+ * Copyright (C) 2008 Lars Hjemli
+ *
+ * Licensed under GNU General Public License v2
+ *   (see COPYING for full license text)
+ */
+
+#include "cgit.h"
+#include "html.h"
+#include "ui-shared.h"
+
+void add_entry(struct commit *commit, char *host)
+{
+	char delim = '&';
+	char *hex;
+	char *mail, *t, *t2;
+	struct commitinfo *info;
+
+	info = cgit_parse_commit(commit);
+	hex = sha1_to_hex(commit->object.sha1);
+	html("<entry>\n");
+	html("<title>");
+	html_txt(info->subject);
+	html("</title>\n");
+	html("<updated>");
+	cgit_print_date(info->author_date, FMT_ATOMDATE, ctx.cfg.local_time);
+	html("</updated>\n");
+	html("<author>\n");
+	if (info->author) {
+		html("<name>");
+		html_txt(info->author);
+		html("</name>\n");
+	}
+	if (info->author_email) {
+		mail = xstrdup(info->author_email);
+		t = strchr(mail, '<');
+		if (t)
+			t++;
+		else
+			t = mail;
+		t2 = strchr(t, '>');
+		if (t2)
+			*t2 = '\0';
+		html("<email>");
+		html_txt(t);
+		html("</email>\n");
+		free(mail);
+	}
+	html("</author>\n");
+	html("<published>");
+	cgit_print_date(info->author_date, FMT_ATOMDATE, ctx.cfg.local_time);
+	html("</published>\n");
+	if (host) {
+		html("<link rel='alternate' type='text/html' href='http://");
+		html_attr(host);
+		html_attr(cgit_pageurl(ctx.repo->url, "commit", NULL));
+		if (ctx.cfg.virtual_root)
+			delim = '?';
+		htmlf("%cid=%s", delim, hex);
+		html("'/>\n");
+	}
+	htmlf("<id>%s</id>\n", hex);
+	html("<content type='text'>\n");
+	html_txt(info->msg);
+	html("</content>\n");
+	html("<content type='xhtml'>\n");
+	html("<div xmlns='http://www.w3.org/1999/xhtml'>\n");
+	html("<pre>\n");
+	html_txt(info->msg);
+	html("</pre>\n");
+	html("</div>\n");
+	html("</content>\n");
+	html("</entry>\n");
+	cgit_free_commitinfo(info);
+}
+
+
+void cgit_print_atom(char *tip, char *path, int max_count)
+{
+	char *host;
+	const char *argv[] = {NULL, tip, NULL, NULL, NULL};
+	struct commit *commit;
+	struct rev_info rev;
+	int argc = 2;
+
+	if (!tip)
+		argv[1] = ctx.qry.head;
+
+	if (path) {
+		argv[argc++] = "--";
+		argv[argc++] = path;
+	}
+
+	init_revisions(&rev, NULL);
+	rev.abbrev = DEFAULT_ABBREV;
+	rev.commit_format = CMIT_FMT_DEFAULT;
+	rev.verbose_header = 1;
+	rev.show_root_diff = 0;
+	rev.max_count = max_count;
+	setup_revisions(argc, argv, &rev, NULL);
+	prepare_revision_walk(&rev);
+
+	host = cgit_hosturl();
+	ctx.page.mimetype = "text/xml";
+	ctx.page.charset = "utf-8";
+	cgit_print_http_headers(&ctx);
+	html("<feed xmlns='http://www.w3.org/2005/Atom'>\n");
+	html("<title>");
+	html_txt(ctx.repo->name);
+	html("</title>\n");
+	html("<subtitle>");
+	html_txt(ctx.repo->desc);
+	html("</subtitle>\n");
+	if (host) {
+		html("<link rel='alternate' type='text/html' href='http://");
+		html_attr(host);
+		html_attr(cgit_repourl(ctx.repo->url));
+		html("'/>\n");
+	}
+	while ((commit = get_revision(&rev)) != NULL) {
+		add_entry(commit, host);
+		free(commit->buffer);
+		commit->buffer = NULL;
+		free_commit_list(commit->parents);
+		commit->parents = NULL;
+	}
+	html("</feed>\n");
+}

ui-atom.h

@@ -0,0 +1,6 @@
+#ifndef UI_ATOM_H
+#define UI_ATOM_H
+
+extern void cgit_print_atom(char *tip, char *path, int max_count);
+
+#endif

ui-shared.c

@@ -34,6 +34,21 @@ void cgit_print_error(char *msg)
 	html("</div>\n");
 }
 
+char *cgit_hosturl()
+{
+	char *host, *port;
+
+	host = getenv("SERVER_NAME");
+	if (!host)
+		return NULL;
+	port = getenv("SERVER_PORT");
+	if (port && atoi(port) != 80)
+		host = xstrdup(fmt("%s:%d", host, atoi(port)));
+	else
+		host = xstrdup(host);
+	return host;
+}
+
 char *cgit_rooturl()
 {
 	if (ctx.cfg.virtual_root)
@@ -428,6 +443,7 @@ void cgit_print_http_headers(struct cgit_context *ctx)
 
 void cgit_print_docstart(struct cgit_context *ctx)
 {
+	char *host = cgit_hosturl();
 	html(cgit_doctype);
 	html("<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en' lang='en'>\n");
 	html("<head>\n");
@@ -445,6 +461,13 @@ void cgit_print_docstart(struct cgit_context *ctx)
 		html_attr(ctx->cfg.favicon);
 		html("'/>\n");
 	}
+	if (host && ctx->repo) {
+		html("<link rel='alternate' title='Atom feed' href='http://");
+		html_attr(cgit_hosturl());
+		html_attr(cgit_fileurl(ctx->repo->url, "atom", ctx->qry.path,
+				       fmt("h=%s", ctx->qry.head)));
+		html("' type='application/atom+xml'/>");
+	}
 	html("</head>\n");
 	html("<body>\n");
 }

ui-shared.h

@@ -1,6 +1,7 @@
 #ifndef UI_SHARED_H
 #define UI_SHARED_H
 
+extern char *cgit_hosturl();
 extern char *cgit_repourl(const char *reponame);
 extern char *cgit_fileurl(const char *reponame, const char *pagename,
 			  const char *filename, const char *query);