Add tflint fot Terraform

test/command_callback/test_terraform_tflint_command_callback.vader

@@ -0,0 +1,32 @@
+Before:
+
+  Save g:ale_terraform_tflint_executable
+  Save g:ale_terraform_tflint_options
+
+  runtime ale_linters/terraform/tflint.vim
+
+
+After:
+  Restore
+  call ale#linter#Reset()
+
+
+Execute(The default executable should be configurable):
+  AssertEqual 'tflint', ale_linters#terraform#tflint#GetExecutable(bufnr(''))
+
+  let g:ale_terraform_tflint_executable = 'asdf'
+
+  AssertEqual 'asdf', ale_linters#terraform#tflint#GetExecutable(bufnr(''))
+
+Execute(The default command should be good):
+  let g:ale_terraform_tflint_executable = 'tflint'
+  AssertEqual
+  \ ale#Escape('tflint') . ' -f json',
+  \ ale_linters#terraform#tflint#GetCommand(bufnr(''))
+
+Execute(Overriding things should work):
+  let g:ale_terraform_tflint_executable = 'fnord'
+  let g:ale_terraform_tflint_options = '--whatever'
+  AssertEqual
+  \ ale#Escape('fnord') . ' --whatever -f json',
+  \ ale_linters#terraform#tflint#GetCommand(bufnr(''))

test/handler/test_tflint_handler.vader

@@ -0,0 +1,28 @@
+Before:
+  runtime! ale_linters/terraform/tflint.vim
+
+After:
+  call ale#linter#Reset()
+
+Execute(The tflint handler should parse items correctly):
+  AssertEqual
+  \ [
+  \   {
+  \     'lnum': 12,
+  \     'text': 'be warned, traveller',
+  \     'type': 'W',
+  \   },
+  \   {
+  \     'lnum': 9,
+  \     'text': 'error message',
+  \     'type': 'E',
+  \   },
+  \   {
+  \     'lnum': 5,
+  \     'text': 'just so ya know',
+  \     'type': 'I',
+  \   },
+  \ ],
+  \ ale_linters#terraform#tflint#Handle(123, [
+  \ '[ { "detector": "aws_db_instance_readable_password", "type": "WARNING", "message": "be warned, traveller", "line": 12, "file": "github.com/wata727/example-module/aws_db_instance.tf", "link": "https://github.com/wata727/tflint/blob/master/docs/aws_db_instance_readable_password.md" }, { "detector": "aws_elasticache_cluster_invalid_type", "type": "ERROR", "message": "error message", "line": 9, "file": "github.com/wata727/example-module/aws_elasticache_cluster.tf", "link": "https://github.com/wata727/tflint/blob/master/docs/aws_elasticache_cluster_invalid_type.md" }, { "detector": "aws_instance_not_specified_iam_profile", "type": "NOTICE", "message": "just so ya know", "line": 5, "file": "github.com/wata727/example-module/aws_instance.tf", "link": "https://github.com/wata727/tflint/blob/master/docs/aws_instance_not_specified_iam_profile.md" } ]'
+  \ ])

test/test_tflint_config_detection.vader

@@ -0,0 +1,18 @@
+Before:
+  call ale#test#SetDirectory('/testplugin/test')
+  runtime ale_linters/terraform/tflint.vim
+
+After:
+  call ale#test#RestoreDirectory()
+  call ale#linter#Reset()
+
+Execute(adjacent config file should be found):
+  call ale#test#SetFilename('tflint-test-files/foo/bar.tf')
+  AssertEqual
+  \ (
+  \   ale#Escape('tflint')
+  \   . ' --config '
+  \   . ale#Escape(ale#path#Winify(g:dir . '/tflint-test-files/foo/.tflint.hcl'))
+  \   . ' -f json'
+  \ ),
+  \ ale_linters#terraform#tflint#GetCommand(bufnr(''))