Adding 'on' as a truthy value to boolean.

README.md

@@ -180,7 +180,7 @@ Finally, the following additionals filters are avilable:
 
 **boolean(str)**:
     Convert the argument into a boolean. A case insensitive comparison to
-    "true", "yes", and "1" will return `True`. Everything else is false.
+    "true", "yes", "on", and "1" will return `True`. Everything else is false.
 
 **b64encode(str)**:
     Base 64 encode the value.

j2tmpl/cli.py

@@ -91,7 +91,7 @@ def boolean_filter(value):
     if isinstance(value, Undefined):
         return value
 
-    return str(value).lower() in ['true', 'yes', '1']
+    return str(value).lower() in ['true', 'yes', 'on', '1']
 
 
 def b64encode_filter(value):

setup.py

@@ -5,11 +5,11 @@
     long_description = fh.read()
 
 install_requires = ["jinja2"]
-tests_requires = ["pytest", "flake8", "pytest-cover", "pytest-flake8"]
+tests_requires = ["pytest", "flake8<3.8.0", "pytest-cover", "pytest-flake8"]
 
 setup(
     name="j2tmpl",
-    version="0.0.12",
+    version="0.0.13",
     author="Ilya Kogan",
     author_email="[email protected]",
     url="https://github.com/ikogan/j2tmpl",

tests/conftest.py

@@ -17,9 +17,11 @@ def common_environment():
         'TEST_BOOLEAN_TRUE': 'true',
         'TEST_BOOLEAN_YES': 'yes',
         'TEST_BOOLEAN_ONE': '1',
+        'TEST_BOOLEAN_ON': 'on',
         'TEST_BOOLEAN_FALSE': 'false',
         'TEST_BOOLEAN_NO': 'no',
         'TEST_BOOLEAN_ZERO': '0',
+        'TEST_BOOLEAN_OFF': 'off',
         'SHELL': '/bin/bash',
         'SHLVL': '2',
         '_': 'whatisthis',
@@ -50,4 +52,4 @@ def common_rendered():
 CAMEL_CASE_VARIABLE=handlethistoo
 JAVA_camelCaseVariable=thisshouldbefun
 ITERATION_TEST_1_VALUE=first
-ITERATION_TEST_2_VALUE=second"""
+ITERATION_TEST_2_VALUE=second"""

tests/templates/filters/boolean.jinja

@@ -8,6 +8,8 @@
 
 {% if test.boolean.one|boolean %}cool{% else %}bad{% endif %}
 
+{% if test.boolean.on|boolean %}cool{% else %}bad{% endif %}
+
 {% if test.boolean.false|boolean %}bad{% else %}cool{% endif %}
 
 {% if test.boolean.false|upper|boolean %}bad{% else %}cool{% endif %}
@@ -16,4 +18,6 @@
 
 {% if test.boolean.zero|boolean %}bad{% else %}cool{% endif %}
 
+{% if test.boolean.off|boolean %}bad{% else %}cool{% endif %}
+
 {% if test.boolean.undefined|boolean %}bad{% else %}cool{% endif %}