Quiet(er) option

[pvickery-ParamountCommerce]

Introduction

The --quiet option was removed in 0.11.0, as it became the default, but I think it would be useful to add it back to allow even quieter output.

tflint/CHANGELOG.md

Line 1497 in 8bb73bb

- [#413](https://github.com/terraform-linters/tflint/pull/413): Remove `--quiet` option

For example, I run tflint from pre-commit-terraform on a large repo with many projects and when a single project fails tflint, I get the following output for all the projects before any useful information about the findings.

====================================================
working directory: dir1

Plugin "aws" is already installed
====================================================
working directory: dir2

Plugin "aws" is already installed
====================================================
working directory: dir3

Plugin "aws" is already installed
...

Proposal

Can these logs be made option by using --quiet?

References

tflint/cmd/init.go

Lines 27 to 28 in 8bb73bb

	fmt.Fprint(cli.outStream, "====================================================\n")
	fmt.Fprintf(cli.outStream, "working directory: %s\n\n", wd)

tflint/cmd/init.go

Line 68 in 8bb73bb

fmt.Fprintf(cli.outStream, "Plugin \"%s\" is already installed\n", pluginCfg.Name)

Related issue: #1849

[wata727]

Alternatively, it may be worth considering changing the behavior of --recursive --init so that it doesn't output anything if nothing happens in the subdir.

If we introduce --quiet, it is important to introduce subcommands first, since its name can be read as applying to other commands as well #1618