generate_bear_requirements.py: Tidy language file

Remove values `[]` and sort by bear name.

Related to coala#2479

.ci/generate_bear_requirements.py

@@ -19,7 +19,6 @@
 import itertools
 import os
 import sys
-import operator
 
 from ruamel.yaml import YAML, RoundTripDumper
 from ruamel.yaml.comments import CommentedMap
@@ -175,15 +174,24 @@ def get_pip_requirements(requirements):
 def get_cabal_requirements(requirements):
     return _get_requirements(requirements, '==')
 
+
+def _create_sorted_commented_map(input_dict):
+    return CommentedMap(sorted(input_dict.items(),
+                               key=lambda t: t[0]))
+
+
 def get_languages(bears):
     language_dict = {}
     for bear in bears:
         language_dict[str(bear.name)] = list(sorted(bear.LANGUAGES))
-    for value in language_dict.values():
+    for key, value in language_dict.items():
         if 'All' in value:
             value.remove('All')
         if 'default' in value:
             value.remove('default')
+        if not value:
+            language_dict[key] = None
+
     return language_dict
 
 
@@ -222,10 +230,10 @@ def deep_diff(target, src):
     return errors
 
 
+
 def sort_requirements(req_dict):
     for key in INSTANCE_NAMES:
-        req_dict[key] = CommentedMap(sorted(req_dict[key].items(),
-                                            key=lambda t: t[0]))
+        req_dict[key] = _create_sorted_commented_map(req_dict[key])
 
 
 if __name__ == '__main__':
@@ -288,8 +296,8 @@ def sort_requirements(req_dict):
     else:
         output = open(args.output, 'w')
 
-    all_bears.sort(key = operator.attrgetter('name'))
     language_requirements = get_languages(all_bears)
+    language_requirements = _create_sorted_commented_map(language_requirements)
     file_path = os.path.join(PROJECT_DIR, BEAR_LANGUAGES_YAML)
     with open(file_path, 'w') as outfile:
         yaml.indent(mapping=2, sequence=4, offset=2)

bear-languages.yaml

@@ -1,6 +1,6 @@
 AlexBear:
   - Natural Language
-AnnotationBear: []
+AnnotationBear:
 ApertiumLintBear:
   - Apertium
 ArtisticStyleBear:
@@ -137,7 +137,7 @@ DocumentationStyleBear:
   - python3
   - tcl
   - vhdl
-DuplicateFileBear: []
+DuplicateFileBear:
 ESLintBear:
   - HTML
   - JSX
@@ -146,7 +146,7 @@ ESLintBear:
   - Typescript
 ElmLintBear:
   - Elm
-FilenameBear: []
+FilenameBear:
 FormatRBear:
   - R
 GNUIndentBear:
@@ -186,7 +186,7 @@ HTMLLintBear:
   - HTML
   - Jinja2
   - PHP
-HTTPSBear: []
+HTTPSBear:
 HTTPoliceLintBear:
   - HAR
 HappinessLintBear:
@@ -195,10 +195,10 @@ HaskellLintBear:
   - Haskell
 HgCommitBear:
   - Hg
-IndentationBear: []
+IndentationBear:
 InferBear:
   - Java
-InvalidLinkBear: []
+InvalidLinkBear:
 JSComplexityBear:
   - JavaScript
 JSHintBear:
@@ -214,23 +214,23 @@ Jinja2Bear:
   - Jinja2
 JuliaLintBear:
   - Julia
-KeywordBear: []
+KeywordBear:
 LanguageToolBear:
   - Natural Language
 LatexLintBear:
   - Tex
-LicenseCheckBear: []
-LicenseHeaderBear: []
-LineCountBear: []
-LineLengthBear: []
+LicenseCheckBear:
+LicenseHeaderBear:
+LineCountBear:
+LineLengthBear:
 LuaLintBear:
   - Lua
 MarkdownBear:
   - Markdown
 MatlabIndentationBear:
   - Matlab
   - Octave
-MementoBear: []
+MementoBear:
 MypyBear:
   - Python
   - Python 2
@@ -311,7 +311,7 @@ PythonPackageInitBear:
   - Python
   - Python 2
   - Python 3
-QuotesBear: []
+QuotesBear:
 RAMLLintBear:
   - RAML
 RLintBear:
@@ -346,7 +346,7 @@ ShellCheckBear:
   - dash
   - ksh
   - sh
-SpaceConsistencyBear: []
+SpaceConsistencyBear:
 SpellCheckBear:
   - Natural Language
 StyleLintBear:
@@ -366,8 +366,8 @@ TextLintBear:
   - reStructuredText
 TravisLintBear:
   - YAML
-URLBear: []
-URLHeadBear: []
+URLBear:
+URLHeadBear:
 VCSCommitMetadataBear:
   - Git
 VHDLLintBear:
@@ -389,7 +389,7 @@ YapfBear:
   - Python
   - Python 2
   - Python 3
-_CommitBear: []
-coalaBear: []
+_CommitBear:
+coalaBear:
 reSTLintBear:
   - reStructuredText