doc: add release notes to doxygen documentation

Provides a script to generate a doxygen page from the
`release-notes.txt` and includes it to the doxygen build.

doc/doxygen/.gitignore

 src/css/variables.less
+src/changelog.md

doc/doxygen/Makefile

@@ -10,11 +10,11 @@ doc: html
 
 # by marking html as phony we force make to re-run Doxygen even if the directory exists.
 .PHONY: html
-html: src/css/riot.css
+html: src/css/riot.css src/changelog.md
 	( cat riot.doxyfile ; echo "GENERATE_HTML = yes" ) | doxygen -
 
 .PHONY: man
-man:
+man: src/changelog.md
 	( cat riot.doxyfile ; echo "GENERATE_MAN = yes" ) | doxygen -
 
 ifneq (,$(shell which lessc))
@@ -27,9 +27,12 @@ src/css/variables.less: src/config.json
 	  -e 's/",\?$$/;/g' -e 's/\\"/"/g' > $@
 endif
 
+src/changelog.md: src/changelog.md.tmp ../../release-notes.txt
+	@./generate-changelog.py $+ $@
+
 .PHONY:
-latex:
+latex: src/changelog.md
 	( cat riot.doxyfile ; echo "GENERATE_LATEX= yes" ) | doxygen -
 
 clean:
-	-@rm -rf latex man html doxygen_objdb_*.tmp doxygen_entrydb_*.tmp
+	-@rm -rf latex man html doxygen_objdb_*.tmp doxygen_entrydb_*.tmp src/changelog.md

doc/doxygen/generate-changelog.py

+#! /usr/bin/env python
+# -*- coding: utf-8 -*-
+# vim:fenc=utf-8
+#
+# Copyright © 2017 Martine Lenders <m.lenders@fu-berlin.de>
+#
+# Distributed under terms of the MIT license.
+
+from __future__ import print_function
+import re
+import sys
+
+def generate_changelog(template_filename, changelog_filename, output_filename):
+    with open(template_filename) as template, \
+         open(changelog_filename) as changelog, \
+         open(output_filename, "w") as output:
+        changelog_lines = []
+        release_title = re.compile(r"((RIOT-\d{4}\.\d{2} - Release Notes)|(Release 2013\.08))")
+        notes_template = re.compile(r"\[Notes\]")
+        first_title = True
+        title = 0
+        prev_newline = False
+        # Traverse changelog file line-wise
+        for line in changelog:
+            # Remove duplicate newlines
+            if line == "\n" and not prev_newline:
+                prev_newline = True
+            elif line == "\n" and prev_newline:
+                continue
+            else:
+                prev_newline = False
+            if title:                           # if a release title was previously detected
+                changelog_lines.append("\n")    # Remove the underline
+                title = False
+                prev_newline = True             # this introduces a newline, so count it
+            elif release_title.match(line):
+                # if line contains a release title
+                release_match = re.search(r"(\d{4}\.\d{2})", line)
+                assert(release_match != None)
+                # parse out release number
+                release = release_match.group(1)
+                title = "Release %s" % release
+                tag = "release-%s" % release.replace('.', '-')
+                # append as level 1 title with reference anchor tag
+                changelog_lines.append("# %s {#%s}\n" % (title ,tag))
+                title = True
+                first_title = False
+            else:
+                # append non-title log lines as verbatim (so notation is kept)
+                changelog_lines.append("    %s" % line)
+        for line in template:
+            # Traverse template file line-wise
+            if notes_template.match(line):
+                # if template string is matched: start adding changelog lines
+                for line_log in changelog_lines:
+                    print(line_log, file=output, end="")
+            else:
+                # just print the template line
+                print(line, file=output, end="")
+
+if __name__ == "__main__":
+    if len(sys.argv) < 4:
+        print("usage %s <md template> <changelog> <output md>" % sys.argv[0], file=sys.stderr)
+        sys.exit(1)
+    generate_changelog(sys.argv[1], sys.argv[2], sys.argv[3])
+

doc/doxygen/riot.doxyfile

@@ -764,7 +764,8 @@ INPUT                  = ../../doc.txt \
                          src/mainpage.md \
                          src/creating-modules.md \
                          src/creating-an-application.md \
-                         src/getting-started.md
+                         src/getting-started.md \
+                         src/changelog.md
 
 # This tag can be used to specify the character encoding of the source files
 # that doxygen parses. Internally doxygen uses the UTF-8 encoding. Doxygen uses

doc/doxygen/src/changelog.md.tmp

+Changelog                                                           {#changelog}
+=========
+
+[TOC]
+
+[Notes]