Added option to get resolved packages in a requirements.txt file #135

[arijitde92]

Added a new click option in resolve_cli.py to provide a file name into which the resolved packages will be written. Also added a function in utils.py that writes of the resolved packages into the file.

I wrote the click option parameters as shown below-
@click.option( "--res", "resolved_output", type=FileOptionType(mode="w", encoding="utf-8", lazy=True), required=False, metavar="FILE", help="Write the resolved packages into a TEXT file. ", )

Please let me know if anything needs to be changed.
Thanks.

[TG1999]

@arijitde92 thanks ++, please add tests to test the functionality that you have added

[arijitde92]

@arijitde92 thanks ++, please add tests to test the functionality that you have added

Hi @TG1999 , I have added a test in test_cli.py and it is passing. Please have a look and let me know if anything else is required.

Thanks

[pombredanne]

@arijitde92 Thanks. I like the idea of writing back requirements. We need to find a better name and help text for the CLI options as well as the module name though: neither --res nor "Write the resolved packages into a TEXT file. " are obvious.

[arijitde92]

@arijitde92 Thanks. I like the idea of writing back requirements. We need to find a better name and help text for the CLI options as well as the module name though: neither --res nor "Write the resolved packages into a TEXT file. " are obvious.

Hi @pombredanne @TG1999, it would be really great if you can suggest some names and help text for the CLI options and module names. Since -r and -p are already taken for requirements and python version option, we need to think of other names for the resolved package option.

[TG1999]

@arijitde92 I think --resolved-output sounds good?

@pombredanne separate question can --resolved-output option be used along with --json or --json-pdt aor it should be mutually exclusive?

[arijitde92]

Hi @TG1999 , @pombredanne ,

I changed the name to --resolved-output and the help text as Write the packages that are resolved after inspecting, into a TEXT file. The packages are written in a typical requirements file format that can be used by pip..

Is this okay?

[TG1999]

@arijitde92 please rebase and resolve conflicts