Add necessary commands for VSCode Devcontainers

[howlowck]

Changes:

• Added short and format args to version command
• Added a trivial implementation of the config command which echos out the content when given an absolute path of a file

Resolves:

• Using podman-compose for dockerComposePath fails version check microsoft/vscode-remote-release#5553
• Missing config command #106

[muayyad-alsadi]

does vscode expects
version on stdout or stderr?

the following line should be replaced with log(...) (it just a helper that just print to stderr)

        sys.stderr("File path is required. use -f flag to set the input file")
...
    if (file_path == None):
        sys.stderr("File path is required. use -f flag to set the input file")
        return

even more, this should be part of parsing, which is handled by argparse not need at all to process it

parser.add_argument("-f", "--format", type=str, default='pretty', 
        help="Format the output. Values: [pretty | json].")

should have choices like this

parser.add_argument("-f", "--format", choices=['pretty', 'json'], default='pretty'
                            help="Format the output")

please don't construct json by substitution and concatenation and replace, use json.dumps

        print('{ "version": "{version}" }'.replace('{version}', __version__))

should be

        res = {"version": __version__}
        print(json.dumps(res))

[howlowck]

Hey @muayyad-alsadi, thanks for the quick review. vscode expects stdout. I will make the suggested updates.

[howlowck]

Updated. Thanks again!

[muayyad-alsadi]

I'll do some changes and need your help testing them.

[muayyad-alsadi]

I've made config prints the merged yaml of multiple files
please test

[howlowck]

Yes. Multiple files are merging properly.