Fix lang#html layer (#4202)

autoload/SpaceVim/layers/lang/html.vim

@@ -34,6 +34,13 @@
 " <
 "
 
+if exists('s:user_emmet_leader_key')
+  finish
+
+endif
+
+let s:user_emmet_leader_key = '<C-e>'
+
 
 function! SpaceVim#layers#lang#html#plugins() abort
   let plugins = [
@@ -49,7 +56,7 @@ function! SpaceVim#layers#lang#html#plugins() abort
 endfunction
 
 function! SpaceVim#layers#lang#html#config() abort
-  let g:user_emmet_leader_key=get(g:, 'user_emmet_leader_key', '<C-e>')
+  let g:user_emmet_leader_key = s:user_emmet_leader_key
   augroup spacevim_lang_html
     autocmd!
     autocmd FileType html,css,scss,sass,less,javascript,jsp,vue,eex,php call s:install_emmet()
@@ -58,6 +65,10 @@ function! SpaceVim#layers#lang#html#config() abort
   augroup END
 endfunction
 
+function! SpaceVim#layers#lang#html#set_variable(var) abort
+  let s:user_emmet_leader_key = get(a:var, 'user_emmet_leader_key', s:user_emmet_leader_key)
+endfunction
+
 
 function! s:install_emmet() abort
   try

docs/cn/layers/lang/html.md

@@ -11,6 +11,7 @@ lang: zh
 - [模块描述](#模块描述)
 - [启用模块](#启用模块)
   - [安装语言服务器](#安装语言服务器)
+- [模块选项](#模块选项)
 - [功能特性](#功能特性)
 - [快捷键](#快捷键)
 
@@ -37,6 +38,16 @@ lang: zh
 npm install --global vscode-html-languageserver-bin
 ```
 
+## 模块选项
+
+- `user_emmet_leader_key`: 设置插件 emmet 的默认前置键。
+
+  ```toml
+  [layers]
+    name = "lang#html"
+    user_emmet_leader_key = "<C-e>"
+  ```
+
 ## 功能特性
 
 - 通过[neosnippet](https://github.com/Shougo/neosnippet.vim/) 和 [emmet-vim](https://github.com/mattn/emmet-vim) 自动生成 HTML、CSS 代码块

docs/layers/lang/html.md

@@ -10,6 +10,7 @@ description: "Edit html in SpaceVim, with this layer, this layer provides code c
 - [Description](#description)
 - [Install](#install)
   - [Language server](#language-server)
+- [Layer options](#layer-options)
 - [Features](#features)
 - [Key bindings](#key-bindings)
 
@@ -36,10 +37,20 @@ To install the language server, you need `npm` on your machine:
 npm install --global vscode-html-languageserver-bin
 ```
 
+## Layer options
+
+- `user_emmet_leader_key`: change the default leader key for emmet.
+
+  ```toml
+  [layers]
+    name = "lang#html"
+    user_emmet_leader_key = "<C-e>"
+  ```
+
 ## Features
 
 - Generate HTML and CSS coding using [neosnippet](https://github.com/Shougo/neosnippet.vim/) and [emmet-vim](https://github.com/mattn/emmet-vim)
-- Tags navigation on key % using matchit.vim
+- Tags navigation on key `%` using vim-matchup
 - auto-completion
 - syntax checking
 - language server protocol (need `lsp` layer)