feat: Add possibility to share tflint config file for subdirs (antonbabenko#149)

Author: antonbabenko

README.md

@@ -121,6 +121,16 @@ if they are present in `README.md`.
           - '--args=--enable-rule=terraform_documented_variables'
     ```
 
+1. When you have multiple directories and want to run `tflint` in all of them and share single config file it is impractical to hard-code the path to `.tflint.hcl` file. The solution is to use `__GIT_WORKING_DIR__` placeholder which will be replaced by `terraform_tflint` hooks with Git working directory (repo root) at run time. For example:
+
+   ```yaml
+   hooks:
+     - id: terraform_tflint
+       args:
+         - '--args=--config=__GIT_WORKING_DIR__/.tflint.hcl'
+   ```
+
+
 ## Notes about terraform_tfsec hooks
 
 1. `terraform_tfsec` will consume modified files that pre-commit

terraform_tflint.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-set -e
+set -eo pipefail
 
 main() {
   initialize_
@@ -35,7 +35,8 @@ parse_cmdline_() {
     case $argv in
       -a | --args)
         shift
-        ARGS+=("$1")
+        expanded_arg="${1//__GIT_WORKING_DIR__/$PWD}"
+        ARGS+=("$expanded_arg")
         shift
         ;;
       --)
@@ -45,6 +46,7 @@ parse_cmdline_() {
         ;;
     esac
   done
+
 }
 
 tflint_() {