Derive command name from command-line arguments.

The command name is determined by the command-line used to invoke the
program, and should not be hard-coded in messages. Derive it from the
command-line arguments.

1 files changed, 12 insertions, 6 deletions

diff --git a/coverage/cmdline.py b/coverage/cmdline.py
index 46a87ca6..94bb75f2 100644
--- a/coverage/cmdline.py
+++ b/coverage/cmdline.py
@@ -142,6 +142,8 @@ class CoverageOptionParser(optparse.OptionParser, object):
 
     """
 
+    program_name = os.path.basename(sys.argv[0])
+
     def __init__(self, *args, **kwargs):
         super(CoverageOptionParser, self).__init__(
             add_help_option=False, *args, **kwargs
@@ -228,7 +230,7 @@ class CmdOptionParser(CoverageOptionParser):
         if usage:
             usage = "%prog " + usage
         super(CmdOptionParser, self).__init__(
-            prog="coverage %s" % action,
+            prog="%(program_name)s %s" % action,
             usage=usage,
             description=description,
         )
@@ -523,13 +525,17 @@ class CoverageScript(object):
         assert error or topic or parser
         if error:
             print(error)
-            print("Use 'coverage help' for help.")
+            print("Use '%(program_name)s help' for help." % {
+                    'program_name': parser.program_name})
         elif parser:
             print(parser.format_help().strip())
         else:
+            help_params = self.covpkg.__dict__
+            help_params.update({
+                    'program_name': CoverageOptionParser.program_name})
             help_msg = textwrap.dedent(HELP_TOPICS.get(topic, '')).strip()
             if help_msg:
-                print(help_msg % self.covpkg.__dict__)
+                print(help_msg % help_params)
             else:
                 print("Don't know topic %r" % topic)
 
@@ -682,7 +688,7 @@ HELP_TOPICS = {
     Coverage.py, version %(__version__)s
     Measure, collect, and report on code coverage in Python programs.
 
-    usage: coverage <command> [options] [args]
+    usage: %(program_name)s <command> [options] [args]
 
     Commands:
         annotate    Annotate source files with execution information.
@@ -694,12 +700,12 @@ HELP_TOPICS = {
         run         Run a Python program and measure code execution.
         xml         Create an XML report of coverage results.
 
-    Use "coverage help <command>" for detailed help on any command.
+    Use "%(program_name)s help <command>" for detailed help on any command.
     For full documentation, see %(__url__)s
     """,
 
     'minimum_help': """\
-    Code coverage for Python.  Use 'coverage help' for help.
+    Code coverage for Python.  Use '%(program_name)s help' for help.
     """,
 
     'version': """\