Honor excludes; don't run against entire directories (closes #121)

[ericfrederich]

Closes #121

[bruce-szalwinski]

https://github.com/antonbabenko/pre-commit-terraform/blob/2e40ade8d0bdff4eea5fb64e55d6f40a71768426/CHANGELOG.md#v120---2017-06-08 the exclude option is documented way back in version 1.2.0. Is that no longer working? Was it working previously?

I ran into this while upgrading a module mono repo to 0.12. My client is using the 0.11 version of the module but the 0.12 version of the module comes along for the ride.

When trying to commit my changes on a repo that uses the module, I get:

Error running fmt: In .terraform/modules/26b44daf48f2995f5f7159f55b3e58ba/0.12/datadog.tf: At 5:25: Unknown token: 5:25 IDENT var.monitor_name

I have my pre-commit configured as:

- repo: git://github.com/antonbabenko/pre-commit-terraform
  rev: v1.31.0
  hooks:
    - id: terraform_fmt
      exclude: \.terraform\/.*$

I think it is the same issue that was raised back in #8 from long ago. The hook gets passed the list of files and the dirname is causing issues.

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[MaxymVlasov]

Works fine with the latest version

repos:
- repo: https://github.com/antonbabenko/pre-commit-terraform
  rev: v1.62.3
  hooks:
  - id: terraform_fmt
    exclude: environment\/.*$

\.terraform\/.*$ excluded globally from Aug 2019