Use `stty size` to find terminal width if we're on linux and COLUMNS is not exported

diff --git a/youtube-dl b/youtube-dl
index 34a60af..2512547 100755 (executable)
--- a/youtube-dl
+++ b/youtube-dl
@@ -2744,11 +2744,21 @@ def parseOpts():
 
                return "".join(opts)
 
+       def _find_term_columns():
+               columns = os.environ.get('COLUMNS', None)
+               if columns: return int(columns)
+
+               if sys.platform.startswith('linux'):
+                       try: columns = os.popen('stty size', 'r').read().split()[1]
+                       except: pass
+
+               if columns: return int(columns)
+
        max_width = 80
        max_help_position = 80
 
        # No need to wrap help messages if we're on a wide console
-       columns = os.environ.get('COLUMNS', None)
+       columns = _find_term_columns()
        if columns: max_width = columns
 
        fmt = optparse.IndentedHelpFormatter(width=max_width, max_help_position=max_help_position)