Skip deprecated lexers (Pygments 2.7.3 and later)

Work around the way Pygments maintainers have decided to list
"deprecated" lexers, but just skipping them if attempting to add
raises an IndexError because they look like JSONBareObject here:

https: //github.com/pygments/pygments/commit/5ee1754
Change-Id: Ia7b896263b4118ec369c5ce130addef3295a91a5

lodgeit/lib/highlighting.py

@@ -35,7 +35,12 @@ def _get_pygments_lexers(add_empty=True):
     if add_empty:
         r.append(('', ''),)
     for lexer in get_all_lexers():
+        try:
             r.append((lexer[1][0], _(lexer[0])),)
+        except IndexError:
+            # Skip "deprecated" lexer entries, like this in Pygments 2.7.3:
+            # https://github.com/pygments/pygments/commit/5ee1754
+            continue
     return r
 
 

requirements.txt

@@ -2,7 +2,7 @@ six
 Jinja2
 Werkzeug<0.16
 Pygments<2.6;python_version<'3'
-Pygments<2.7.3;python_version>='3'
+Pygments;python_version>='3'
 SQLAlchemy
 PyMySQL
 simplejson