devtools: Make the raw changelog more readable

The links were rather annoying in the flowing text, so extract them
and add them to the footer of the release instead. This uses the
shorthand and footnote style of links.

devtools/changelog.py

@@ -23,6 +23,7 @@ sections = [
 repo = 'ElementsProject/lightning'
 
 Entry = namedtuple("Entry", ["commit", "pullreq", "content", "section"])
+Link = namedtuple("Link", ["ref", "content", "url"])
 
 
 def git(cmd):
@@ -75,6 +76,17 @@ def get_log_entries(commitrange):
     return entries
 
 
+def linkify(entries):
+    links = []
+    for e in entries:
+        links.append(Link(
+            ref='#{}'.format(e.pullreq),
+            content=e.content,
+            url="https://github.com/ElementsProject/lightning/pull/{}".format(e.pullreq)
+        ))
+    return list(set(links))
+
+
 def group(entries):
     groups = {s: [] for s in sections}
     for e in entries:
@@ -92,7 +104,12 @@ def commit_date(commitsha):
 
 template = Template("""<%def name="group(entries)">
 % for e in entries:
- - ${e.content} ([${e.pullreq}](https://github.com/ElementsProject/lightning/pull/${e.pullreq}))
+ - ${e.content} ([#${e.pullreq}])
+% endfor
+
+</%def><%def name="group_links(entries)">
+% for e in entries:
+[${e.pullreq}]: https://github.com/ElementsProject/lightning/pull/${e.pullreq}
 % endfor
 </%def>
 <!--
@@ -118,6 +135,9 @@ ${group(groups['fixed']) | trim}
 ${h3} Security
 ${group(groups['security']) | trim}
 
+% for l in links:
+[${l.ref}]: ${l.url}
+% endfor
 [${version}]: https://github.com/ElementsProject/lightning/releases/tag/v${version}""")
 
 
@@ -146,4 +166,5 @@ if __name__ == "__main__":
         h3='###',
         version=tocommit[1:],
         date=date,
+        links=linkify(entries),
     ))