yamlfmt (#4587)

* Added the fixer, wrote tests and tested it

doc/ale-supported-languages-and-tools.txt

@@ -699,6 +699,7 @@ Notes:
   * `swaglint`
   * `yaml-language-server`
   * `yamlfix`
+  * `yamlfmt`
   * `yamllint`
 * YANG
   * `yang-lsp`

doc/ale-yaml.txt

@@ -47,6 +47,7 @@ g:ale_yaml_actionlint_options                   *g:ale_yaml_actionlint_options*
 <
   Please note that passing `-format` as option is not supported at the moment.
 
+
 ===============================================================================
 circleci                                                    *ale-yaml-circleci*
 
@@ -242,6 +243,44 @@ g:ale_yaml_yamlfix_use_global                   *g:ale_yaml_yamlfix_use_global*
   See |ale-integrations-local-executables|
 
 
+===============================================================================
+yamlfmt                                                      *ale-yaml-yamlfmt*
+
+Website: https://github.com/google/yamlfmt
+
+
+Installation
+-------------------------------------------------------------------------------
+
+Install yamlfmt:
+
+  See the website.
+
+Options
+-------------------------------------------------------------------------------
+g:ale_yaml_yamlfmt_executable                   *g:ale_yaml_yamlfmt_executable*
+                                                *b:ale_yaml_yamlfmt_executable*
+  Type: |String|
+  Default: `'yamlfmt'`
+
+  See |ale-integrations-local-executables|
+
+
+g:ale_yaml_yamlfmt_options                         *g:ale_yaml_yamlfmt_options*
+                                                   *b:ale_yaml_yamlfmt_options*
+  Type: |String|
+  Default: `''`
+
+  This variable can be set to pass extra options to yamlfmt.
+
+g:ale_yaml_yamlfmt_use_global                   *g:ale_yaml_yamlfmt_use_global*
+                                                *b:ale_yaml_yamlfmt_use_global*
+  Type: |Number|
+  Default: `get(g:, 'ale_use_global_executables', 0)`
+
+  See |ale-integrations-local-executables|
+
+
 ===============================================================================
 yamllint                                                    *ale-yaml-yamllint*
 

doc/ale.txt

@@ -3427,6 +3427,7 @@ documented in additional help files.
     swaglint..............................|ale-yaml-swaglint|
     yaml-language-server..................|ale-yaml-language-server|
     yamlfix...............................|ale-yaml-yamlfix|
+    yamlfmt...............................|ale-yaml-yamlfmt|
     yamllint..............................|ale-yaml-yamllint|
     gitlablint............................|ale-yaml-gitlablint|
   yang....................................|ale-yang-options|