Cleanup yaksh script: fixes #195.

- `yaksh create_demo` now just takes a path and there is no project
  name.
- `yaksh run_demo` is now `yaksh run path_to_demo`.
- This eliminates the need for the annoying `project_detail.py`, which
  is now removed.
- Many demo projects can be created and run.
- Update the README.

2 files changed, 60 insertions, 56 deletions

diff --git a/yaksh/scripts/cli.py b/yaksh/scripts/cli.py
index 1489af7..4a58e48 100644
--- a/yaksh/scripts/cli.py
+++ b/yaksh/scripts/cli.py
@@ -6,13 +6,10 @@ import contextlib
 import os
 from os import path
 import argparse
-from importlib import import_module
 from django.conf import settings
 from django.core import management
 from django.template import Template, Context
 
-from .project_detail import NAME, PATH
-
 CUR_DIR = os.getcwd()
 SCRIPT_DIR = os.path.abspath(os.path.dirname(__file__))
 PARENT_DIR = os.path.abspath(os.path.join(SCRIPT_DIR, os.pardir))
@@ -21,61 +18,68 @@ TEMPLATE_DIR = path.join(PARENT_DIR, 'demo_templates')
 settings.configure()
 django.setup()
 
+
 def main():
-    #Parse command-line to obtain the arguments and/or options
+    # Parse command-line to obtain the arguments and/or options
     # create top-level parser object
     parser = argparse.ArgumentParser(prog="yaksh")
     subparser = parser.add_subparsers(dest="subcommand")
 
     # create parser for the "create_demo" subcommand
-    create_demo_parser = subparser.add_parser("create_demo",
-                                        help="Create a new demo Django project")
-    create_demo_parser.add_argument("project_name", type=str,
-                                        default="yaksh_demo",
-                                        nargs="?",
-                                        help="name of demo Django project")
-    create_demo_parser.add_argument("-p", "--path", type=str,
-                                        help="path of demo Django project")
-    
+    create_demo_parser = subparser.add_parser(
+        "create_demo",
+        help="Create a new demo Django project"
+    )
+    create_demo_parser.add_argument(
+        "path", type=str,
+        default=path.join(CUR_DIR, "yaksh_demo"),
+        nargs="?",
+        help="Path to the demo Django project (defaults to 'yaksh_demo')"
+    )
+
     # create parser for the "run_demo" subcommand
-    run_demo_parser = subparser.add_parser("run_demo",
-                        help="Initialise django server and run the demo project")
+    run_parser = subparser.add_parser(
+        "run",
+        help="Initialise django server and run the demo project"
+    )
+    run_parser.add_argument(
+        "path", type=str, nargs=1,
+        help="full path to the demo yaksh project"
+    )
 
     # create parser for the "run_code_server" subcommand
-    code_server_parser = subparser.add_parser("run_code_server",
-                                                help="Initialise yaksh code server")
-    code_server_parser.add_argument("-P", "--ports", type=int, nargs='+', 
-                                        help="code server ports")
+    code_server_parser = subparser.add_parser(
+        "run_code_server",
+        help="Initialise yaksh code server"
+    )
+    code_server_parser.add_argument("-P", "--ports", type=int, nargs='+',
+                                    help="code server ports")
 
     args = parser.parse_args()
 
     if args.subcommand == "create_demo":
-        if args.path:
-            create_demo(args.project_name, args.path)
-        else:
-            create_demo(args.project_name)
-
-    elif args.subcommand == "run_demo":
-        try:
-            run_demo(NAME, PATH)
-        except Exception as e:
-            if not NAME or not PATH:
-                print("Error: Unable to find Project Name or Path variables\n")
-            else:
-                print("Error: {0}\n".format(e))
-            subparser.print_help()
-
+        pth = path.abspath(args.path)
+        name = path.basename(pth)
+        create_demo(name, pth)
+    elif args.subcommand == "run":
+        pth = path.abspath(args.path[0])
+        name = path.basename(pth)
+        run_demo(name, pth)
     elif args.subcommand == "run_code_server":
         if args.ports:
             run_server(args.ports)
         else:
             run_server()
 
+
 def create_demo(project_name='yaksh_demo', project_dir=CUR_DIR):
+    if not path.exists(project_dir):
+        os.makedirs(project_dir)
     try:
         management.call_command('startproject', project_name, project_dir)
-        print("Demo Django project '{0}' created at '{1}'".format(project_name,
-                                                                project_dir))
+        print("Demo Django project '{0}' created at '{1}'".format(
+            project_name, project_dir)
+        )
     except Exception as e:
         print("Error: {0}\nExiting yaksh Installer".format(e))
 
@@ -87,50 +91,50 @@ def create_demo(project_name='yaksh_demo', project_dir=CUR_DIR):
     project_path = path.join(top_dir, project_name)
     fixture_dir = path.join(PARENT_DIR, 'fixtures')
     fixture_path = path.join(fixture_dir, 'demo_fixtures.json')
-    # Store project details
-    _set_project_details(project_name, top_dir)
 
     with _chdir(project_path):
         root_urlconf = "{0}.{1}".format(project_name, 'demo_urls')
         settings_template_path = path.join(TEMPLATE_DIR, 'demo_settings.py')
         settings_target_path = path.join(project_path, 'demo_settings.py')
         settings_context = Context({'project_name': project_name,
-                                        'root_urlconf': root_urlconf,
-                                        'fixture_dir': fixture_dir})
+                                    'root_urlconf': root_urlconf,
+                                    'fixture_dir': fixture_dir})
         urls_template_path = path.join(TEMPLATE_DIR, 'demo_urls.py')
         urls_target_path = path.join(project_path, 'demo_urls.py')
         command = ("python ../manage.py migrate --run-syncdb "
-                        "--noinput --settings={0}.demo_settings").format(project_name)
+                   "--noinput --settings={0}.demo_settings").format(
+                       project_name)
 
         loaddata_command = ("python ../manage.py loaddata "
-                        "--settings={0}.demo_settings {1}").format(project_name, fixture_path)
+                            "--settings={0}.demo_settings {1}").format(
+                                project_name, fixture_path)
 
         # Create demo_settings file
-        _render_demo_files(settings_template_path, settings_target_path, settings_context)
-        # Create demo_urls file 
+        _render_demo_files(
+            settings_template_path, settings_target_path, settings_context
+        )
+        # Create demo_urls file
         _render_demo_files(urls_template_path, urls_target_path)
         # Run syncdb
-        subprocess.call("{0}; {1}".format(command, loaddata_command), shell=True)
+        subprocess.call(
+            "{0}; {1}".format(command, loaddata_command), shell=True
+        )
+
 
 def run_demo(project_name, top_dir):
     with _chdir(top_dir):
-        project_path = path.join(top_dir, 'manage.py')
         command = ("python manage.py runserver "
-                        "--settings={0}.demo_settings").format(project_name)
+                   "--settings={0}.demo_settings").format(project_name)
         subprocess.call(command, shell=True)
 
-def run_server():
+
+def run_server(args=None):
     try:
         from yaksh import code_server
-        code_server.main()
+        code_server.main(args)
     except Exception as e:
         print("Error: {0}\nExiting yaksh code server".format(e))
 
-def _set_project_details(project_name, top_dir):
-    file_path = path.join(SCRIPT_DIR, 'project_detail.py')
-    detail = "NAME ='{0}'\nPATH ='{1}'".format(project_name, top_dir)
-    with open(file_path, 'w') as data_store:
-        data_store.write(detail)
 
 def _render_demo_files(template_path, output_path, context=None):
     with open(template_path, 'r') as template_file:
@@ -142,6 +146,7 @@ def _render_demo_files(template_path, output_path, context=None):
     with open(output_path, 'w') as new_file:
         new_file.write(content)
 
+
 @contextlib.contextmanager
 def _chdir(path):
     starting_directory = os.getcwd()
@@ -151,5 +156,6 @@ def _chdir(path):
     finally:
         os.chdir(starting_directory)
 
+
 if __name__ == '__main__':
     main()
diff --git a/yaksh/scripts/project_detail.py b/yaksh/scripts/project_detail.py
deleted file mode 100644
index 583e9f4..0000000
--- a/yaksh/scripts/project_detail.py
+++ /dev/null
@@ -1,2 +0,0 @@
-NAME = None
-PATH = None