[FEATURE] Option to install Prettier plugins

[infotexture]

I'd like to use this action on repos that include XML files, and format them with @prettier/plugin-xml.

When I run the action as is, I get errors in the log:

[warn] Ignored unknown option { xmlWhitespaceSensitivity: "strict" }. Did you mean htmlWhitespaceSensitivity?
Error:  No parser could be inferred for file: index.dita

This works fine when I run Prettier locally, as these options are provided by plugin-xml.

Suggestion

💡 Add an option to that would allow users to specify the names of Prettier plugins to install.

I realize it would be possible to fork this action and hard-code additional plugins into the # PROGRAM section where Prettier itself is installed, but it seems like something that others might want to do too, so it might be best to support this here with an option instead.

[creyD]

Sounds cool, if you want you can create a PR for this!

[infotexture]

Parameterizing this might be beyond my ken, but I'll try to put something together and submit for your review.

[creyD]

Can you provide me with step by step instructions what needs to be done to achieve this?

[infotexture]

Prettier plug-ins are installed like Prettier itself, so where you do that on Line 32 of entrypoint.sh, you'd need to add the plug-ins to the list of things to install, like plugin-xml:

 npm install --silent --global prettier @prettier/plugin-xml

But I'm not sure whether you'd want to install all the official plugins, or how to best allow users to specify which plugins they want to install. 🤔

[creyD]

I think it would be best to let users specify which plugins they want to install..

[stemount]

@creyD @infotexture for sure, checked out the PR.

It'd need to be something that ideally did a regex on another env variable such as...

jobs:
    prettier:
        runs-on: ubuntu-latest

        steps:
            - name: Checkout
              uses: actions/checkout@v2
              with:
                  # Make sure the actual branch is checked out when running on pull requests
                  ref: ${{ github.head_ref }}
                  # This is important to fetch the changes to the previous commit
                  fetch-depth: 0

            - name: Prettify code
              uses: creyD/prettier_action@v3.1
              with:
                  # You'd wanna ensure this worked out as a nice simple regex
                  # e.g (@prettier\/)+(plugin-[a-z\-]+)
                  plugins:
                      - plugin-xml

[stemount]

oh damn, I forgot to change the issue to add regex

(@prettier\/)+(plugin-[a-z\-]+)

as suggested to ensure that the plugin could not "expand" out of this other than dashes and a-z chars.