From 2476507c0de2dee1aaf809d838dcd5406f09e34f Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Tue, 20 Sep 2011 11:06:51 -0400
Subject: chdir() into the same directory as the scene file.

---
 dimension/dimension.in | 20 +++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/dimension/dimension.in b/dimension/dimension.in
index c637d26..d9cecb2 100644
--- a/dimension/dimension.in
+++ b/dimension/dimension.in
@@ -21,8 +21,9 @@
 
 import argparse as _argparse
 import re as _re
-import os.path as _path
+import os as _os
 import sys as _sys
+from contextlib import contextmanager as _contextmanager
 
 # Specialized parser to print --version output to stdout rather than stderr,
 # to pass distcheck
@@ -33,6 +34,16 @@ class _DimensionArgumentParser(_argparse.ArgumentParser):
       file.write(message)
     _sys.exit(status)
 
+# Change the working directory within a with statement
+@_contextmanager
+def _chdir(newwd):
+  oldwd = _os.getcwd()
+  try:
+    _os.chdir(newwd)
+    yield
+  finally:
+    _os.chdir(oldwd)
+
 # Parse the command line
 _parser = _DimensionArgumentParser(
   epilog = "@PACKAGE_STRING@\n"
@@ -102,7 +113,7 @@ else:
 
 # Default output is basename(input).png
 if _args.output is None:
-  _noext = _path.splitext(_path.basename(_args.input))[0]
+  _noext = _os.path.splitext(_os.path.basename(_args.input))[0]
   _args.output = _noext + ".png"
 
 # Imports available to scripts
@@ -157,8 +168,11 @@ recursion_limit  = None
 if not _args.quiet:
   print("Parsing scene ...")
 
+# Run with the script's dirname as the working directory
+_workdir = _os.path.dirname(_os.path.abspath(_args.input))
+
 parse_timer = Timer()
-with open(_args.input) as _fh:
+with open(_args.input) as _fh, _chdir(_workdir):
   exec(compile(_fh.read(), _args.input, "exec"))
 parse_timer.stop()
 
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