main: tweak 'west help' text for extensions

Use the phrase "extension commands" and print the project path along
with its name.

We don't use {name_and_path} here because users probably aren't used
to that format yet.

Signed-off-by: Marti Bolivar <marti.bolivar@nordicsemi.no>

src/west/main.py

@@ -168,8 +168,10 @@ class WestArgumentParser(argparse.ArgumentParser):
                     if not specs:
                         continue
 
-                    append('commands from project at "{}":'.
-                           format(path))
+                    project = specs[0].project  # they're all from this project
+                    append(project.format(
+                        'extension commands from project '
+                        '{name} (path: {path}):'))
 
                     for spec in specs:
                         self.format_extension_spec(append, spec, width)

tests/test_project.py

@@ -362,11 +362,11 @@ def test_extension_command_multiproject(repos_tmpdir):
     # The newline shenanigans are for Windows.
     help_text = '\n'.join(cmd('-h').splitlines())
     expected = '\n'.join([
-        'commands from project at "{}":'.format(os.path.join('subdir',
-                                                             'Kconfiglib')),
+        'extension commands from project Kconfiglib (path: {}):'.
+        format(os.path.join('subdir', 'Kconfiglib')),
         '  kconfigtest:          (no help provided; try "west kconfigtest -h")',  # noqa: E501
         '',
-        'commands from project at "net-tools":',
+        'extension commands from project net-tools (path: net-tools):',
         '  test-extension:       test-extension-help'])
     assert expected in help_text, help_text