[yt-svn] commit/yt: ngoldbaum: Subclassing argparse.ArgumentParser to get a better error message. Closes #596.

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1 new commit in yt:

https://bitbucket.org/yt_analysis/yt/commits/3a638f82a37e/
Changeset:   3a638f82a37e
Branch:      yt
User:        ngoldbaum
Date:        2013-06-21 21:13:12
Summary:     Subclassing argparse.ArgumentParser to get a better error message.  Closes #596.

See http://stackoverflow.com/questions/4561580/how-to-let-the-parser-print-help-message-rather-than-error-and-exit
Affected #:  1 file

diff -r 2c15a177fc684678b9c09120a6cf3b08ddb19457 -r 3a638f82a37eb6a647ca4cda18446d94a055f221 yt/startup_tasks.py
--- a/yt/startup_tasks.py
+++ b/yt/startup_tasks.py
@@ -98,7 +98,17 @@
         if param == "loglevel": # special case
             mylog.setLevel(int(val))
 
-parser = argparse.ArgumentParser(description = 'yt command line arguments')
+class YTParser(argparse.ArgumentParser):
+    def error(self, message):
+        """error(message: string)
+
+        Prints a help message that is more detailed than the argparse default
+        and then exits.
+        """
+        self.print_help(sys.stderr)
+        self.exit(2, '%s: error: %s\n' % (self.prog, message))
+
+parser = YTParser(description = 'yt command line arguments')
 parser.add_argument("--config", action=SetConfigOption,
     help = "Set configuration option, in the form param=value")
 parser.add_argument("--paste", action=SetExceptionHandling,

Repository URL: https://bitbucket.org/yt_analysis/yt/

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