Fix support for the "prog" keyword to the OptionParser constructor, as well

as directly setting the .prog attribute (which should be supported based on
the class docstring).
Closes SF bug #850964.

Lib/optparse.py

@@ -1025,6 +1025,11 @@ class OptionParser (OptionContainer):
         self.largs = None
         self.values = None
 
+    def _get_prog_name(self):
+        if self.prog:
+            return self.prog
+        else:
+            return get_prog_name()
 
     # -- Simple modifier methods ---------------------------------------
 
@@ -1288,12 +1293,12 @@ class OptionParser (OptionContainer):
         should either exit or raise an exception.
         """
         self.print_usage(sys.stderr)
-        sys.exit("%s: error: %s" % (get_prog_name(), msg))
+        sys.exit("%s: error: %s" % (self._get_prog_name(), msg))
 
     def get_usage (self):
         if self.usage:
             return self.formatter.format_usage(
-                self.usage.replace("%prog", get_prog_name()))
+                self.usage.replace("%prog", self._get_prog_name()))
         else:
             return ""
 
@@ -1311,7 +1316,7 @@ class OptionParser (OptionContainer):
 
     def get_version (self):
         if self.version:
-            return self.version.replace("%prog", get_prog_name())
+            return self.version.replace("%prog", self._get_prog_name())
         else:
             return ""
 

Lib/test/test_optparse.py

@@ -612,6 +612,22 @@ class TestVersion(BaseTest):
         self.assertStdoutEquals(["--version"], "bar 0.1\n")
         sys.argv[0] = oldargv
 
+    def test_version_with_prog_keyword(self):
+        oldargv = sys.argv[0]
+        sys.argv[0] = "./foo/bar"
+        self.parser = OptionParser(usage=SUPPRESS_USAGE, version="%prog 0.1",
+                                   prog="splat")
+        self.assertStdoutEquals(["--version"], "splat 0.1\n")
+        sys.argv[0] = oldargv
+
+    def test_version_with_prog_attribute(self):
+        oldargv = sys.argv[0]
+        sys.argv[0] = "./foo/bar"
+        self.parser = OptionParser(usage=SUPPRESS_USAGE, version="%prog 0.1")
+        self.parser.prog = "splat"
+        self.assertStdoutEquals(["--version"], "splat 0.1\n")
+        sys.argv[0] = oldargv
+
     def test_no_version(self):
         self.parser = OptionParser(usage=SUPPRESS_USAGE)
         self.assertParseFail(["--version"],