Add set-uri command (#50)

*Add set-uri command

The set-uri command will accept an argument which will be then be set as the default URI value locally.
Passing no arguments will prompt the user for input, but will also display a currently stored URI.  Hitting enter
without an input will use that stored URI.  If no URI is stored then the prompt will refresh.

*Updates addressing comments:

- Add a docstring for the new command
- Make the set-uri command call a user prompt action if the command is
run without an argument.
- Reworked the set-uri with updated docstring and with a leaner output
- Added the set-uri to the Readme.

README.md

@@ -207,6 +207,7 @@ configurations and listing the commands available.
 configured shell when the launched application exits. Returning you to your existing
 shell without modification. Useful for quickly testing changes to a configuration
 requiring a running an application.
+5. `hab set-uri`: A command that allows the user to set a default URI. This default will be used with the dash `"-"` flag, which allows the user to quickly recall the saved URI. A argument can be passed to directly set the default. Alternatively, it can be run with no argument which will provide a prompt for the user to enter a URI. This method will display any currently saved URI for reference.
 
 Examples:
 

hab/cli.py

@@ -336,6 +336,29 @@ def _cli(
     logging.basicConfig(level=level)
 
 
+# set uri command
+@_cli.command()
+@click.argument("uri", required=False)
+@click.pass_obj
+def set_uri(settings, uri):
+    '''Allows for saving a local URI default by passing
+    a URI argument.  If no argument is passed uri-set
+    will prompt you to enter and argument.'''
+    settings.log_context(uri)
+    current_uri = settings.resolver.user_prefs().uri
+    if uri is None:
+        uri = click.prompt(
+            "Please enter a URI value"
+            f"[{Fore.LIGHTBLUE_EX}{current_uri}{Fore.RESET}]",
+            default=current_uri,
+            show_default=False,
+            type=str,
+            err=True,
+        )
+    click.echo(f"\nSetting default URI to: {Fore.LIGHTBLUE_EX}{uri}{Fore.RESET}\n")
+    settings.resolver.user_prefs().uri = uri
+
+
 # env command
 @_cli.command(cls=UriHelpClass)
 @click.argument("uri", cls=UriArgument)