[PATCH] Add RSS support to hgweb

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[PATCH] Add RSS support to hgweb

From: Goffredo Baroncelli <kreijack@libero.it>

with the two small patches below, now hgweb can act as feed source.
Two kinds ofobjects can be tracked: the changelong and the files. This
can be useful if anyone would track the changes of a file ( and
because git has it, mercurial have to has ).

To check the changelog the url is
http://127.0.0.1:8000/pippo.pluto?cmd=changelog;style=rss

To check a file ( the mercurial/hgweb.py for examples ) the url is
http://127.0.0.1:8000/?cmd=filelog;file=mercurial/hgweb.py;filenode=0;style=rss

The first patch adds a new filter for the template: the filter is
named rfc822date, and translates the date from the touple format to a
rfc822 style date. The second patch adds the templates needed to
create the rss pages.

Tested with akgregator ( kde ).

[tweaked by mpm:

 add Content-type: text/xml
 add support for URL to header()
 add header with link and content type
 add RSS links on the normal pages]

manifest hash: 170c03d50490d7160097f59abdde1a5073d2ba82
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mercurial/hgweb.py

@@ -108,6 +108,12 @@ class templater:
             tmpl = self.cache[t] = file(self.map[t]).read()
         return template(tmpl, self.filters, **map)
 
+def rfc822date(x):
+    month= [None,"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+                 "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
+    yyyy,mon,dd,hh,mm,ss,wd,x,y = time.gmtime(x)
+    return "%d %s %d %d:%d:%d"%(dd, month[mon], yyyy, hh, mm, ss)
+
 class hgweb:
     maxchanges = 10
     maxfiles = 10
@@ -127,7 +133,8 @@ class hgweb:
             "obfuscate": obfuscate,
             "short": (lambda x: x[:12]),
             "firstline": (lambda x: x.splitlines(1)[0]),
-            "permissions": (lambda x: x and "-rwxr-xr-x" or "-rw-r--r--")
+            "permissions": (lambda x: x and "-rwxr-xr-x" or "-rw-r--r--"),
+            "rfc822date": rfc822date,
             }
 
     def refresh(self):
@@ -217,7 +224,12 @@ class hgweb:
             yield diffblock(mdiff.unidiff(to, date1, tn, date2, f), f, tn)
 
     def header(self):
-        yield self.t("header", repo = self.reponame)
+        port = os.environ["SERVER_PORT"]
+        port = port != "80" and (":" + port) or ""
+        self.url = "http://%s%s%s" % \
+                   (os.environ["SERVER_NAME"], port, os.environ["REQUEST_URI"])
+
+        yield self.t("header", repo = self.reponame, url = self.url)
 
     def footer(self):
         yield self.t("footer", repo = self.reponame)
@@ -729,6 +741,9 @@ def server(path, name, templates, address, port):
             env = {}
             env['GATEWAY_INTERFACE'] = 'CGI/1.1'
             env['REQUEST_METHOD'] = self.command
+            env['SERVER_NAME'] = self.server.server_name
+            env['SERVER_PORT'] = str(self.server.server_port)
+            env['REQUEST_URI'] = "/"
             if query:
                 env['QUERY_STRING'] = query
             host = self.address_string()

templates/changelog-rss.tmpl

@@ -0,0 +1,6 @@
+#header#
+    <title>#repo|escape# Changelog</title>
+    <description>#repo|escape# Changelog</description>
+    #entries#
+  </channel>
+</rss>

templates/changelog.tmpl

@@ -6,6 +6,7 @@
 <div class="buttons">
 <a href="?cmd=tags">tags</a>
 <a href="?cmd=manifest;manifest=#manifest#;path=/">manifest</a>
+<a href="?cmd=changelog;style=rss">rss</a>
 </div>
 
 <h2>changelog for #repo|escape#</h2>

templates/changelogentry-rss.tmpl

@@ -0,0 +1,7 @@
+<item>
+    <title>#desc|firstline|escape#</title>
+    <link>http://127.0.0.1:8000/?cmd=changeset;node=#node#"</link>
+    <description>#desc|escape|addbreaks#</description>
+    <author>#author|obfuscate#</author>
+    <pubDate>#date|rfc822date#</pubDate>
+</item>

templates/filelog-rss.tmpl

@@ -0,0 +1,6 @@
+#header#
+    <title>#repo|escape#: #file# history</title>
+    <description>#file# revision history</description>
+    #entries#
+  </channel>
+</rss>

templates/filelog.tmpl

@@ -8,6 +8,7 @@
 <a href="?cmd=tags">tags</a>
 <a href="?cmd=file;file=#file#;filenode=#filenode#">file</a>
 <a href="?cmd=annotate;file=#file#;filenode=#filenode#">annotate</a>
+<a href="?cmd=filelog;file=#file#;filenode=0;style=rss">rss</a>
 </div>
 
 <h2>#file# revision history</h2>

templates/filelogentry-rss.tmpl

@@ -0,0 +1,7 @@
+<item>
+    <title>#desc|firstline|escape#</title>
+    <link>http://127.0.0.1:8000/?cmd=file;file=#file#;filenode=#filenode#"</link>
+    <description>#desc|escape|addbreaks#</description>
+    <author>#author|obfuscate#</author>
+    <pubDate>#date|rfc822date#</pubDate>>
+</item>

templates/header-rss.tmpl

@@ -0,0 +1,6 @@
+Content-type: text/xml
+
+<rss version="2.0">
+  <channel>
+    <link>#url#</link>
+    <language>en-us</language>

templates/map-rss

@@ -0,0 +1,5 @@
+header = header-rss.tmpl
+changelog = changelog-rss.tmpl
+changelogentry = changelogentry-rss.tmpl
+filelog = filelog-rss.tmpl
+filelogentry = filelogentry-rss.tmpl