feat(format): add vim-codefmt support

Co-authored-by: Wang Shidong <wsdjeg@outlook.com>

autoload/SpaceVim/layers/format.vim

@@ -25,6 +25,7 @@
 if exists('s:format_on_save')
   finish
 else
+  let s:format_method = 'neoformat'
   let s:format_on_save = 0
   let s:format_ft = []
 endif
@@ -36,13 +37,26 @@ function! SpaceVim#layers#format#health() abort
 endfunction
 
 function! SpaceVim#layers#format#plugins() abort
-  return [
-        \ [g:_spacevim_root_dir . 'bundle/neoformat', {'merged' : 0, 'loadconf' : 1 , 'loadconf_before' : 1}],
-        \ ]
+  if s:format_method ==# 'neoformat'
+    return [
+          \ [g:_spacevim_root_dir . 'bundle/neoformat', {'merged' : 0, 'loadconf' : 1, 'loadconf_before' : 1}],
+          \ ]
+  elseif s:format_method ==# 'codefmt'
+    return [
+          \ ['google/vim-maktaba', {'merged' : 0}],
+          \ ['google/vim-glaive', {'merged' : 0, 'loadconf' : 1}],
+          \ ['google/vim-codefmt', {'merged' : 0}],
+          \ ]
+  endif
 endfunction
 
 function! SpaceVim#layers#format#config() abort
-  call SpaceVim#mapping#space#def('nnoremap', ['b', 'f'], ":Neoformat\<Enter>", 'format-code', 0, 1)
+
+  if s:format_method ==# 'neoformat'
+    call SpaceVim#mapping#space#def('nnoremap', ['b', 'f'], 'Neoformat', 'format-code', 1)
+  elseif s:format_method ==# 'codefmt'
+    call SpaceVim#mapping#space#def('nnoremap', ['b', 'f'], 'FormatCode', 'format-code', 1)
+  endif
   augroup spacevim_layer_format
     autocmd!
     autocmd BufWritePre * call s:format()
@@ -50,13 +64,12 @@ function! SpaceVim#layers#format#config() abort
 endfunction
 
 function! SpaceVim#layers#format#set_variable(var) abort
+  let s:format_method = get(a:var, 'format_method', s:format_method)
   let s:format_on_save = get(a:var, 'format_on_save', s:format_on_save)
 endfunction
 
 function! SpaceVim#layers#format#get_options() abort
-
-  return ['format_on_save']
-
+  return ['format_method', 'format_on_save']
 endfunction
 
 function! SpaceVim#layers#format#add_filetype(ft) abort
@@ -74,12 +87,11 @@ endfunction
 function! s:format() abort
   if !empty(&ft) &&
         \ ( index(s:format_ft, &ft) !=# -1 || s:format_on_save ==# 1)
-    try
-      undojoin
-      Neoformat
-    catch /^Vim\%((\a\+)\)\=:E790/
-    finally
-      silent Neoformat
-    endtry
+
+    if s:format_method ==# 'neoformat'
+      undojoin | Neoformat
+    elseif s:format_method ==# 'codefmt'
+      undojoin | FormatCode
+    endif
   endif
 endfunction

config/plugins/vim-glaive.vim

@@ -0,0 +1 @@
+call glaive#Install()

docs/layers/format.md

@@ -18,8 +18,11 @@ description: "Code formatting layer for SpaceVim, includes a variety of formatte
 
 ## Description
 
-`format` layer provides code formatting feature for SpaceVim, this layer includes `neoformat`
-as the default code formatting plugin.
+The `format` layer provides code formatting for SpaceVim, with support for
+[`neoformat`](https://github.com/sbdchd/neoformat) (default) and
+[`codefmt`](https://github.com/google/vim-codefmt) underlying code
+formatting plugins.
+
 
 ## Install
 
@@ -35,7 +38,16 @@ This layer is enabled by default. If you want to disable it, add the following t
 
 ### Layer options
 
-- **`format_on_save`**: This option is to enable/disable code formatting when save current buffer,
+- **`format_method`**: The default plugin is `neoformat` but can be changed to `codefmt`:
+
+  ```toml
+  [[layers]]
+    name = "format"
+    format_method = "codefmt"
+  ```
+
+- **`format_on_save`**: This layer option is to enable/disable code formatting when save current buffer,
+
   and it is disabled by default. To enable it:
 
   ```toml
@@ -63,7 +75,9 @@ This layer is enabled by default. If you want to disable it, add the following t
 neoformat is a formatting framework, all of it's options can be used in bootstrap function. You can read
 `:help neoformat` for more info.
 
-here is an example to add a formater for java file, and it has been included into `lang#java` layer:
+
+Here is an example for add formatter for java file, and it has been included into `lang#java` layer:
+
 
 ```viml
 let g:neoformat_enabled_java = ['googlefmt']