oxfmt: Support ignoring files

[leaysgur]

We want to implement the following:

• Support .prettierignore file
• --ignore-path=./path/to/ignorefile
• --with-node-modules
  • Prettier ignores node_modules by default
• .git, .jj, .sl, .svn and .hg are also ignored by default

I will start by considering the feature set to be implemented.

#13705 may be related to this if we add --ignore-pattern=PATH (and/or --no-ignore).

[Dunqing]

Just noticed that any popular repos that use prettier are included in the .prettierignore file, so we should prioritize supporting this.

[leaysgur]

node_modules and other vcs dirs

These are not collectted in the first place.

For ignore(below options), collects paths first and then makes a decision.

--ignore-path=./path/to/ignorefile

Will support this.

• If specified, use only this ignore file
• If specified but not found, error
• Can be specified many

Default

Also will support.

• Search cwd only, not look up from target path, nor parent directories
• Use both .gitignore and .prettierignore
  • If not found, just skip it
• Merge and use them

--no-ignore

Not support for now, since Prettier does not have.

[leaysgur]

#14798