feat(formatter): add deno fmt (#60)

* feat(formatter): add deno fmt

* sort deno-fmt alphabetically

Author: rogue-sly

README.md

@@ -15,6 +15,7 @@
 - [cljfmt](https://github.com/weavejester/cljfmt)
 - [csharpier](https://csharpier.com/)
 - [dart](https://github.com/dart-lang)
+- [deno_fmt](https://github.com/denoland/deno) as `deno fmt`
 - [djhtml](https://github.com/rtts/djhtml)
 - [docformatter](https://github.com/PyCQA/docformatter)
 - [dprint](https://dprint.dev/)

lua/guard-collection/formatter.lua

@@ -53,6 +53,12 @@ M.dart = {
   stdin = true,
 }
 
+M.deno_fmt = {
+  cmd = 'deno',
+  args = { 'fmt', '-' },
+  stdin = true,
+}
+
 M.djhtml = {
   cmd = 'djhtml',
   args = { '-' },

test/formatter/deno_fmt_spec.lua

@@ -0,0 +1,28 @@
+describe('deno fmt', function()
+  it('can format', function()
+    local ft = require('guard.filetype')
+    ft('typescript'):fmt('deno_fmt')
+
+    local formatted = require('test.formatter.helper').test_with('typescript', {
+      [[function ]],
+      [[    fibonacci(num:]],
+      [[    number):]],
+      [[number {]],
+      [[  if ]],
+      [[        (num           <= 1              ]],
+      [[    )]],
+      [[    return num          ;]],
+      [[  return fibonacci(num - 1) + fibonacci(num - 2]],
+      [[    );]],
+      [[}]],
+    })
+    assert.are.same({
+      [[function fibonacci(num: number): number {]],
+      [[  if (num <= 1) {]],
+      [[    return num;]],
+      [[  }]],
+      [[  return fibonacci(num - 1) + fibonacci(num - 2);]],
+      [[}]],
+    }, formatted)
+  end)
+end)