Replace json parser by yaml

examples/example-all.yaml.sb

@@ -0,0 +1,17 @@
+bookoptions: 
+  - "diagram"
+  - "repeatchords"
+  - "lilypond"
+  - "pictures"
+booktype: "chorded"
+datadir: "."
+template: "patacrep.tex"
+lang: "fr"
+encoding: "utf8"
+authwords: 
+  sep: 
+    - "and"
+    - "et"
+content: 
+  - 
+    - "sorted"

patacrep/songbook/__main__.py

@@ -1,7 +1,7 @@
 """Command line tool to compile songbooks using the songbook library."""
 
 import argparse
-import json
+import yaml
 import locale
 import logging
 import os.path
@@ -135,13 +135,13 @@ def main():
 
     try:
         with patacrep.encoding.open_read(songbook_path) as songbook_file:
-            songbook = json.load(songbook_file)
+            songbook = yaml.load(songbook_file)
         if 'encoding' in songbook:
             with patacrep.encoding.open_read(
                 songbook_path,
                 encoding=songbook['encoding']
                 ) as songbook_file:
-                songbook = json.load(songbook_file)
+                songbook = yaml.load(songbook_file)
     except Exception as error: # pylint: disable=broad-except
         LOGGER.error(error)
         LOGGER.error("Error while loading file '{}'.".format(songbook_path))