[PATCH] Fix execution of when executing via "python -m xxx meld"

[Peter Tyser <ptyser gmail com>]

Previously Meld would fail if python was invoked with other modules
called out on the command line.  For example if using the "trace"
module:

$ python -m trace -l /home/user/meld/bin/meld fileA.txt fileB.txt
Traceback (most recent call last):
  File "/usr/lib/python2.6/runpy.py", line 122, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.6/runpy.py", line 34, in _run_code
    exec code in run_globals
  File "/usr/lib/python2.6/trace.py", line 813, in <module>
    main()
  File "/usr/lib/python2.6/trace.py", line 801, in main
    t.run('execfile(%r)' % (progname,))
  File "/usr/lib/python2.6/trace.py", line 498, in run
    exec cmd in dict, dict
  File "<string>", line 1, in <module>
  File "/tmp/meld/bin/meld", line 66, in <module>
    import meld.paths
ImportError: No module named meld.paths

bin/meld previously used the "__file__" variable to find out where the
meld source was located.  However when using the "-m" parameter to
Python, the "__file__" variable would point to Python's module loader
"runpy" which resulted in the above error.  Using argv[0] to determine
Meld's location should be more flexible and fixes the error.

Signed-off-by: Peter Tyser <ptyser gmail com>
---
Comments are welcome.  Google research didn't turn up a definitive
answer, so I'm not sure this is the most elegant solution.

 bin/meld |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/bin/meld b/bin/meld
index 71e9d43..224a9ad 100755
--- a/bin/meld
+++ b/bin/meld
@@ -54,7 +54,7 @@ except ValueError:
     profiling = False
 
 # Support running from an uninstalled version
-melddir = os.path.abspath(os.path.join(os.path.dirname(os.path.realpath(__file__)), ".."))
+melddir = os.path.abspath(os.path.join(os.path.dirname(os.path.realpath(sys.argv[0])), ".."))
 if os.path.exists(os.path.join(melddir, "meld.doap")):
     sys.path[0:0] = [melddir]
 else:
-- 
1.7.7.431.g89633