No changes

.vscode/settings.json

@@ -3,6 +3,7 @@
         "BDFL",
         "DEVEL",
         "EOFS",
+        "Envs",
         "HELPMSG",
         "METH",
         "NPROCESSORS",

src/core.py

@@ -29,16 +29,17 @@
 
 __all__ = ['f2format', 'convert', 'ConvertError']
 
-# macros
-PARSO_VERSION = ('3.6', '3.7', '3.8')
-LOCALE_ENCODING = locale.getpreferredencoding()
-
 # from configparser
 BOOLEAN_STATES = {'1': True, '0': False,
                   'yes': True, 'no': False,
                   'true': True, 'false': False,
                   'on': True, 'off': False}
 
+# macros
+PARSO_VERSION = ('3.6', '3.7', '3.8')
+LOCALE_ENCODING = locale.getpreferredencoding()
+F2FORMAT_QUIET = BOOLEAN_STATES.get(os.getenv('F2FORMAT_QUIET', '0').casefold(), False)
+
 
 class ConvertError(SyntaxError):
     pass
@@ -76,6 +77,9 @@ def convert(string, lineno=None):
      - string -- str, context to be converted
      - lineno -- dict<int: int>, line number to actual offset mapping
 
+    Envs:
+     - F2FORMAT_VERSION -- encoding to open source files (same as `--encoding` option in CLI)
+
     Returns:
      - str -- converted string
 
@@ -226,8 +230,13 @@ def f2format(filename):
     Args:
      - filename -- str, file to be converted
 
+    Envs:
+     - F2FORMAT_QUIET -- run in quiet mode (same as `--quiet` option in CLI)
+     - F2FORMAT_VERSION -- encoding to open source files (same as `--encoding` option in CLI)
+     - F2FORMAT_ENCODING -- convert against Python version (same as `--python` option in CLI)
+
     """
-    if not BOOLEAN_STATES.get(os.getenv('F2FORMAT_QUIET', '0').casefold(), False):
+    if not F2FORMAT_QUIET:
         print('Now converting %r...' % filename)  # pragma: no cover
 
     # fetch encoding