adding initial boilerplates

python/cli-click/multipleSubCommands.py

@@ -0,0 +1,64 @@
+import os
+import sys
+import click
+
+CONTEXT_SETTINGS = dict(auto_envvar_prefix='COMPLEX')
+
+
+class Environment(object):
+
+    def __init__(self):
+        self.verbose = False
+        self.home = os.getcwd()
+
+    def log(self, msg, *args):
+        """Logs a message to stderr."""
+        if args:
+            msg %= args
+        click.echo(msg, file=sys.stderr)
+
+    def vlog(self, msg, *args):
+        """Logs a message to stderr only if verbose is enabled."""
+        if self.verbose:
+            self.log(msg, *args)
+
+
+pass_environment = click.make_pass_decorator(Environment, ensure=True)
+cmd_folder = os.path.abspath(os.path.join(os.path.dirname(__file__),
+                                          'commands'))
+
+
+class ComplexCLI(click.MultiCommand):
+
+    def list_commands(self, ctx):
+        rv = []
+        for filename in os.listdir(cmd_folder):
+            if filename.endswith('.py') and \
+               filename.startswith('cmd_'):
+                rv.append(filename[4:-3])
+        rv.sort()
+        return rv
+
+    def get_command(self, ctx, name):
+        try:
+            if sys.version_info[0] == 2:
+                name = name.encode('ascii', 'replace')
+            mod = __import__('complex.commands.cmd_' + name,
+                             None, None, ['cli'])
+        except ImportError:
+            return
+        return mod.cli
+
+
+@click.command(cls=ComplexCLI, context_settings=CONTEXT_SETTINGS)
+@click.option('--home', type=click.Path(exists=True, file_okay=False,
+                                        resolve_path=True),
+              help='Changes the folder to operate on.')
+@click.option('-v', '--verbose', is_flag=True,
+              help='Enables verbose mode.')
+@pass_environment
+def cli(ctx, verbose, home):
+    """A complex command line interface."""
+    ctx.verbose = verbose
+    if home is not None:
+        ctx.home = home