Add support for parsing from stdin.

Document stdin & stdout capabilities in README.

README

@@ -81,11 +81,15 @@ configuration (see `--logformat` argument documentation).
 
 Input files may be provided gzip'ed.
 
+Input filename "-" is understood as stdin.
+
 Output
 ------
 
 The output is HTML + CSS + JS, so you need a web browser to read it.
 
+Output filename "-" is understood as stdout.
+
 Usage
 =====
 

apachedex/__init__.py

@@ -974,13 +974,16 @@ def main():
   for fileno, filename in enumerate(infile_list, 1):
     print >> sys.stderr, 'Processing %s [%i/%i]' % (
       filename, fileno, file_count)
-    logfile = gzip.open(filename)
-    try:
-      logfile.readline()
-    except IOError:
-      logfile = open(filename)
+    if filename == '-':
+      logfile = sys.stdin
     else:
-      logfile.seek(0)
+      logfile = gzip.open(filename)
+      try:
+        logfile.readline()
+      except IOError:
+        logfile = open(filename)
+      else:
+        logfile.seek(0)
     lineno = 0
     for lineno, line in enumerate(logfile, 1):
       if lineno % 5000 == 0: