# HG changeset patch
# User Jeff Hammel <k0scist@gmail.com>
# Date 1400310945 25200
# Node ID ce95c61cb435b745d145ad23bde92d0d47fc4cba
# Parent  3fe1024377ca68e024100e1e3653229a679e84f0
add viewer for graphviz; silly, but effective

diff -r 3fe1024377ca -r ce95c61cb435 python/gview.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/python/gview.py	Sat May 17 00:15:45 2014 -0700
@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+view graphviz files
+
+http://www.graphviz.org/
+"""
+
+# imports
+import argparse
+import os
+import subprocess
+import sys
+import tempfile
+
+__all__ = ['main']
+string = (str, unicode)
+
+class Parser(argparse.ArgumentParser):
+    """CLI option parser"""
+    def __init__(self):
+        argparse.ArgumentParser.__init__(self, description=__doc__)
+        self.add_argument('input',
+                          help='graphviz file to view')
+        self.add_argument('-o', '--output', dest='output',
+                          help="path to save to")
+        self.add_argument('-e', '--program', dest='program',
+                          default='dot',
+                          help="GraphViz program to invoke [DEFAULT: %(default)s]")
+        self.add_argument('-v', '--view', dest='viewer', default='feh',
+                          help="viewer")
+
+
+def main(args=sys.argv[1:]):
+    """CLI"""
+
+    # parse command line
+    parser = Parser()
+    options = parser.parse_args(args)
+
+    #
+    assert os.path.exists(options.input)
+    output = options.output or tempfile.mktemp(suffix='.png')
+
+    command = [options.program,
+               options.input,
+               '-Tpng',
+               '-o', output]
+    subprocess.check_call(command)
+    assert os.path.exists(output)
+
+    if options.viewer:
+        subprocess.call([options.viewer, output])
+
+    if not options.output:
+        os.remove(output)
+
+
+if __name__ == '__main__':
+  main()
+