Ticket #372: pygments-lexer_guess.patch

pygments/cmdline.py

@@ -29 +29 @@
 
        %s -S <style> -f <formatter> [-a <arg>] [-O <options>] [-P <option=value>]
        %s -L [<which> ...]
+       %s -N <infile>
        %s -H <type> <name>
        %s -h | -V
 
@@ -67 +68 @@
 The -L option lists lexers, formatters, styles or filters -- set
 `which` to the thing you want to list (e.g. "styles"), or omit it to
 list everything.
+
+The -N option attempts to guess the appropriate lexer based solely on
+the filename. If no lexer can be determined "text" is returned.
 
 The -H option prints detailed help for the object <name> of type <type>,
 where <type> is one of "lexer", "formatter" or "filter".
@@ -185 +189 @@
     """
     # pylint: disable-msg=R0911,R0912,R0915
 
-    usage = USAGE % ((args[0],) * 5)
+    usage = USAGE % ((args[0],) * 6)
 
     try:
-        popts, args = getopt.getopt(args[1:], "l:f:F:o:O:P:LS:a:hVHg")
+        popts, args = getopt.getopt(args[1:], "l:f:F:o:O:P:LS:a:N:hVHg")
     except getopt.GetoptError, err:
         print >>sys.stderr, usage
         return 2
@@ -260 +264 @@
         else:
             parsed_opts[name] = value
     opts.pop('-P', None)
+
+    # handle ``pygmentize -N``
+    infn = opts.pop('-N', None)
+    if infn is not None:
+        try:
+            lexer = get_lexer_for_filename(infn, **parsed_opts)
+        except ClassNotFound, err:
+            lexer = TextLexer()
+        except OptionError, err:
+            print >>sys.stderr, 'Error:', err
+            return 1
+        
+        print lexer.aliases[0]
+        return 0
 
     # handle ``pygmentize -S``
     S_opt = opts.pop('-S', None)