From c683a1ff6a79bc6c5dbd80b5de8bd70fb26febe9 Mon Sep 17 00:00:00 2001
From: Michael Tremer <michael.tremer@ipfire.org>
Date: Tue, 7 May 2019 19:07:12 +0100
Subject: [PATCH] wiki: Add support for Interwiki links

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>
---
 src/backend/wiki.py | 46 +++++++++++++++++++++++++++++++++++++++++++++
 src/scss/style.scss |  4 ++++
 2 files changed, 50 insertions(+)

diff --git a/src/backend/wiki.py b/src/backend/wiki.py
index c50d8ea1..ebb57d81 100644
--- a/src/backend/wiki.py
+++ b/src/backend/wiki.py
@@ -11,6 +11,12 @@ from . import misc
 from . import util
 from .decorators import *
 
+INTERWIKIS = {
+	"google"    : ("https://www.google.com/search?q=%(url)s", None, "fab fa-google"),
+	"rfc"       : ("https://tools.ietf.org/html/rfc%(name)s", "RFC %s", None),
+	"wp"        : ("https://en.wikipedia.org/wiki/%(name)s", None, "fab fa-wikipedia-w"),
+}
+
 class Wiki(misc.Object):
 	def _get_pages(self, query, *args):
 		res = self.db.query(query, *args)
@@ -267,6 +273,43 @@ class Page(misc.Object):
 		if self.data.author_uid:
 			return self.backend.accounts.get_by_uid(self.data.author_uid)
 
+	def _render_interwiki_link(self, m):
+		wiki = m.group(1)
+		if not wiki:
+			return
+
+		# Retrieve URL
+		try:
+			url, repl, icon = INTERWIKIS[wiki]
+		except KeyError:
+			logging.warning("Invalid interwiki: %s" % wiki)
+			return
+
+		# Name of the page
+		name = m.group(2)
+
+		# Expand URL
+		url = url % {
+			"name" : name,
+			"url"  : urllib.parse.quote(name),
+		}
+
+		# Get alias (if present)
+		alias = m.group(3)
+
+		if not alias and repl:
+			alias = repl % name
+
+		# Put everything together
+		s = []
+
+		if icon:
+			s.append("<span class=\"%s\"></span>" % icon)
+
+		s.append("""<a class="link-external" href="%s">%s</a>""" % (url, alias or name))
+
+		return " ".join(s)
+
 	def _render(self, text):
 		logging.debug("Rendering %s" % self)
 
@@ -303,6 +346,9 @@ class Page(misc.Object):
 		for (start, end), file, alt_text, url in reversed(replacements):
 			text = text[:start] + "[![%s](%s)](%s?action=detail)" % (alt_text, url, file.url) + text[end:]
 
+		# Handle interwiki links
+		text = re.sub(r"\[\[(\w+)>(.+?)(?:\|(.+?))?\]\]", self._render_interwiki_link, text)
+
 		# Add wiki links
 		patterns = (
 			(r"\[\[([\w\d\/\-\.]+)(?:\|(.+?))\]\]", r"\1", r"\2", None, True),
diff --git a/src/scss/style.scss b/src/scss/style.scss
index c0280318..23116f4a 100644
--- a/src/scss/style.scss
+++ b/src/scss/style.scss
@@ -296,6 +296,10 @@ section {
 		@extend .table-sm;
 		@extend .table-striped;
 	}
+
+	.link-external {
+		@extend .text-secondary;
+	}
 }
 
 hr.divider {
-- 
2.47.3