From 5a5da58a56a7e3a87c60584a91cd5a27aa8383fa Mon Sep 17 00:00:00 2001
From: "Edward Z. Yang" <edwardzyang@thewritingpot.com>
Date: Sun, 10 Aug 2008 21:54:12 -0400
Subject: [PATCH] Implement RSSFromGit, a substitute for RSSFromSVN.

Signed-off-by: Edward Z. Yang <edwardzyang@thewritingpot.com>
---
 XHTMLCompiler/DOMFilter/RSSFromGit.php | 82 ++++++++++++++++++++++++++++++++++
 XHTMLCompiler/Page.php                 |  4 +-
 config.filters.php                     |  1 +
 3 files changed, 85 insertions(+), 2 deletions(-)
 create mode 100644 XHTMLCompiler/DOMFilter/RSSFromGit.php

diff --git a/XHTMLCompiler/DOMFilter/RSSFromGit.php b/XHTMLCompiler/DOMFilter/RSSFromGit.php
new file mode 100644
index 0000000..227e56a
--- /dev/null
+++ b/XHTMLCompiler/DOMFilter/RSSFromGit.php
@@ -0,0 +1,82 @@
+<?php
+
+/**
+ * GEnerates an RSS feed from a page's associated Git log.
+ */
+class XHTMLCompiler_DOMFilter_RSSFromGit extends XHTMLCompiler_DOMFilter
+{
+    protected $name = 'RSSFromGit';
+    /** Number of log entries to display */
+    protected $limit = 10;
+    /** Description of changelog to place in feed title */
+    protected $description = 'Git changelog for %s';
+    /** Compact title to place in <link> and other places */
+    protected $title = 'Log for %s';
+    protected $xcAttr = array('rss-from-git');
+    
+    public function process(DOMDocument $dom, $page, $manager) {
+        $xc = XHTMLCompiler::getInstance();
+        // implement gitweb/repo.or.cz support
+        
+        $logs = $page->getLog();
+        
+        // see if we need to make the link ourself
+        $trigger = $this->confiscateAttr($dom->documentElement, $this->ns, 'rss-from-git');
+        if ($trigger == 'yes') {
+            // this shows up twice because we have to perform all
+            // confiscations before aborting
+            if (!$logs) return;
+            $link = $dom->createElement('link');
+            $link->setAttribute('rel', 'alternate');
+            $link->setAttribute('type', 'application/rss+xml');
+            $link->setAttribute('title', str_replace('%s', $page->getCachePath(), $this->title));
+            $link->setAttribute('href', $page->getPathStem() . '.rss');
+            $head = $this->query('//html:head')->item(0);
+            $head->appendChild($link);
+        } else {
+            // grab the document's links to RSS feeds
+            // link must be marked with xc:rss-from-svn
+            // only one allowed
+            $link = $this->query('//html:link[@xc:rss-from-svn]')->item(0);
+            if (!$link) return; // nothing to do
+            
+            $trigger = $this->confiscateAttr($link, $this->ns, 'rss-from-svn');
+            if ($trigger != 'yes') return;
+            if (!$logs) return;
+        }
+        
+        $path = $page->getWebPath();
+        
+        $rss = new XHTMLCompiler_RSSFeed(
+            $link->getAttribute('title'),
+            $path,
+            str_replace('%s', $page->getCachePath(), $this->description),
+            $dom->documentElement->getAttribute('xml:lang')
+        );
+        
+        for ($i = 0; $i < $this->limit && isset($logs[$i]); $i++) {
+            $commit = $logs[$i];
+            
+            // :TODO: link to gitweb commitdiff
+            $item_link = $path . '#git_' . $commit->id;
+            
+            // generate short message (first line) for title\
+            
+            $rss->addItem(
+                $item_link,
+                htmlspecialchars($commit->message),
+                $d = $commit->committedDate->format('r'),
+                // :TODO: Extend phpgit so that we can retrieve full message
+                htmlspecialchars($commit->message)
+            );
+        }
+        
+        $rss->save(
+            $page->normalizePath(
+                $link->getAttribute('href')
+            )
+        );
+        
+        
+    }
+}
diff --git a/XHTMLCompiler/Page.php b/XHTMLCompiler/Page.php
index d54da6d..758ac7c 100644
--- a/XHTMLCompiler/Page.php
+++ b/XHTMLCompiler/Page.php
@@ -283,10 +283,10 @@ class XHTMLCompiler_Page
     /**
      * Retrieves the log that represents this page.
      */
-    public function getLog() {
+    public function getLog($kwargs = array()) {
         // This doesn't account for sub-repositories
         $repo = $this->getRepo();
-        return $repo->log('master', array($this->getGitPath()), array('follow' => true));
+        return $repo->log('master', array($this->getGitPath()), array_merge(array('follow' => true), $kwargs));
     }
     
     // this is metadata stuff that needs to be moved and cached
diff --git a/config.filters.php b/config.filters.php
index 30a07ae..fd691c7 100644
--- a/config.filters.php
+++ b/config.filters.php
@@ -8,6 +8,7 @@ $filters->addDOMFilter('NewsLinker');
 $filters->addDOMFilter('GenerateTableOfContents');
 $filters->addDOMFilter('Acronymizer');
 $filters->addDOMFilter('Quoter');
+$filters->addDOMFilter('RSSFromGit');
 $filters->addDOMFilter('RSSGenerator');
 $filters->addDOMFilter('AbsolutePath');
 $filters->addDOMFilter('IEConditionalComments');
-- 
2.11.4.GIT