feat(json5): add json5 support

close https://github.com/SpaceVim/SpaceVim/issues/4776

autoload/SpaceVim/layers/lang/json.vim

@@ -27,6 +27,7 @@
 "     conceal = false
 "     concealcursor = ''
 " <
+" 3. enable_json5: Enable/Disable json5 support. Enabled by default.
 
 if exists('s:conceal')
   " @bug s:conceal always return 0
@@ -37,12 +38,16 @@ if exists('s:conceal')
 else
   let s:conceal = 0
   let s:concealcursor = ''
+  let s:enable_json5 = 1
 endif
 
 
 function! SpaceVim#layers#lang#json#plugins() abort
   let plugins = []
-  call add(plugins, ['elzr/vim-json',                          { 'on_ft' : ['javascript','json']}])   
+  call add(plugins, ['elzr/vim-json',                          { 'merged' : 0}])   
+  if s:enable_json5
+    call add(plugins, ['gutenye/json5.vim',                          { 'merged' : 0}])   
+  endif
   return plugins
 endfunction
 
@@ -55,6 +60,7 @@ endfunction
 function! SpaceVim#layers#lang#json#set_variable(var) abort
   let s:conceal = get(a:var, 'conceal', 0)
   let s:concealcursor = get(a:var, 'concealcursor', 0)
+  let s:enable_json5 = get(a:var, 'enable_json5', 1)
 endfunction
 
 

doc/SpaceVim.txt

@@ -3683,6 +3683,7 @@ OPTIONS
     conceal = false
     concealcursor = ''
 <
+  3. enable_json5: Enable/Disable json5 support. Enabled by default.
 
 ==============================================================================
 LANG#JSONNET                                    *SpaceVim-layers-lang-jsonnet*

docs/layers/lang/json.md

@@ -0,0 +1,41 @@
+---
+title: "SpaceVim lang#json layer"
+description: "json and json5 language support, include syntax highlighting."
+---
+
+# [Available Layers](../../) >> lang#json
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Install](#install)
+- [Layer options](#layer-options)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+This layer is for editing json file, including syntax highlighting.
+
+## Install
+
+To use this configuration layer, update your custom configuration file with:
+
+```toml
+[[layers]]
+  name = "lang#json"
+```
+
+## Layer options
+
+1. `conceal`: Set the valuable for `g:vim_json_syntax_conceal`
+2. `concealcursor`: Set the valuable for `g:vim_json_syntax_concealcursor`
+
+```toml
+[[layers]]
+    name = 'lang#json'
+    conceal = false
+    concealcursor = ''
+```
+
+3. `enable_json5`: Enable/Disable json5 support. Enabled by default.