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>

7 files changed, 168 insertions, 0 deletions

diff --git a/Makefile b/Makefile
index e1436a3..6458431 100644
--- a/Makefile
+++ b/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
diff --git a/cgit.h b/cgit.h
index b01fa31..a1fa841 100644
--- a/cgit.h
+++ b/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"
 
 
 /*
diff --git a/cmd.c b/cmd.c
index fe0ea8f..c0e4db3 100644
--- a/cmd.c
+++ b/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),
diff --git a/ui-atom.c b/ui-atom.c
new file mode 100644
index 0000000..a6ea3ee
--- a/dev/null
+++ b/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");
+}
diff --git a/ui-atom.h b/ui-atom.h
new file mode 100644
index 0000000..749ffd3
--- a/dev/null
+++ b/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
diff --git a/ui-shared.c b/ui-shared.c
index 197ee37..37c60b2 100644
--- a/ui-shared.c
+++ b/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");
 }
diff --git a/ui-shared.h b/ui-shared.h
index 07da4b4..f4123d3 100644
--- a/ui-shared.h
+++ b/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);