Lint line length, clarify index#about,, README badges

misc/lint.py

@@ -5,18 +5,18 @@ Any other automatic checks should be in this file too.
 """
 
 import os
+from os.path import *
 import sys
 
 text_extensions = ('rst', 'md', 'txt', 'html', 'css', 'js')
 
-
-def lint():
+def lint(path):
     """Run linters on all files, print problem files."""
     print('Checking for tabs or trailing whitespace...')
     failed = False
-    for root, _, files in os.walk('.'):
+    for root, _, files in os.walk(path):
         for f in files:
-            fname = os.path.join(root, f)
+            fname = join(root, f)
             if '_build' in fname or not any(
                     fname.endswith(ext) for ext in text_extensions):
                 continue
@@ -28,12 +28,20 @@ def lint():
                        for line in fh.readlines()):
                     failed = True
                     print('ERROR:  trailing whitespace in {}'.format(fname))
+                fh.seek(0)
+                for i, line in enumerate(fh.readlines()):
+                    if len(line) > 81:
+                        failed = True
+                        print('ERROR:  {}:{} - line too long'.format(
+                              fname, i + 1))
     if failed:
-        print('Use your text editor to convert tabs to spaces '
+        print('Use your text editor to convert tabs to spaces, wrap lines '
               'or trim trailing whitespace with minimal effort.')
         sys.exit(failed)
     print('All files are OK')
 
 
 if __name__ == '__main__':
-    lint()
+    # lint everything in the parent directory, wherever the script is run from.
+    p = relpath(join(dirname(__file__), '..'))
+    lint(p)