Add foldsearch layer (#3486)

autoload/SpaceVim/layers/foldsearch.vim

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+"=============================================================================
+" foldsearch.vim --- Fold search support in SpaceVim
+" Copyright (c) 2016-2019 Wang Shidong & Contributors
+" Author: Wang Shidong < wsdjeg@outlook.com >
+" URL: https://spacevim.org
+" License: GPLv3
+"=============================================================================
+
+
+if exists('s:filename')
+  " @bug s:filename always return 'scheme'
+  "
+  " because this script will be loaded twice. This is the feature of vim,
+  " when call an autoload func, vim will try to load the script again
+  finish
+endif
+
+let s:filename = expand('<sfile>:~')
+let s:lnum = expand('<slnum>') + 2
+function! SpaceVim#layers#foldsearch#config()
+
+  let g:_spacevim_mappings_space.F = {'name' : '+Foldsearch'}
+  let lnum = expand('<slnum>') + s:lnum - 1
+  call SpaceVim#mapping#space#def('nnoremap', ['F', 'w'], 'call call('
+        \ . string(s:_function('s:foldsearch_word')) . ', [])',
+        \ ['foldsearch-word',
+        \ [
+        \ 'SPC F w is to foldsearch input word',
+        \ '',
+        \ 'Definition: ' . s:filename . ':' . lnum,
+        \ ]
+        \ ],
+        \ 1)
+endfunction
+
+function! s:foldsearch_word() abort
+  let word = input('foldsearch word >')
+  if !empty(word)
+    call SpaceVim#plugins#foldsearch#word(word)
+  endif
+endfunction
+
+" function() wrapper
+if v:version > 703 || v:version == 703 && has('patch1170')
+  function! s:_function(fstr) abort
+    return function(a:fstr)
+  endfunction
+else
+  function! s:_SID() abort
+    return matchstr(expand('<sfile>'), '<SNR>\zs\d\+\ze__SID$')
+  endfunction
+  let s:_s = '<SNR>' . s:_SID() . '_'
+  function! s:_function(fstr) abort
+    return function(substitute(a:fstr, 's:', s:_s, 'g'))
+  endfunction
+endif
+" vim:set et sw=2 cc=80:

autoload/SpaceVim/plugins/foldsearch.vim

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+"=============================================================================
+" foldsearch.vim --- async foldsearch plugin
+" Copyright (c) 2016-2019 Wang Shidong & Contributors
+" Author: Wang Shidong < wsdjeg@outlook.com >
+" URL: https://spacevim.org
+" License: GPLv3
+"=============================================================================
+
+let s:JOB = SpaceVim#api#import('job')
+let s:matched_lines = []
+
+function! SpaceVim#plugins#foldsearch#word(word)
+  let argv = ['rg', '--line-number', a:word]
+  call s:foldsearch(argv)
+endfunction
+
+function! SpaceVim#plugins#foldsearch#expr(expr)
+  let argv = ['rg', '--line-number', a:expr]
+  call s:foldsearch(argv)
+endfunction
+
+function! s:foldsearch(argv) abort
+  let s:matched_lines = []
+  let jobid = s:JOB.start(a:argv, {
+        \ 'on_stdout' : function('s:std_out'),
+        \ 'on_exit' : function('s:exit'),
+        \ })
+
+  call s:JOB.send(jobid, call('getline', [1, '$']))
+  call s:JOB.chanclose(jobid, 'stdin')
+endfunction
+
+function! s:std_out(id, data, event) abort
+  for line in filter(a:data, '!empty(v:val)')
+    call add(s:matched_lines, str2nr(matchstr(line, '^\d\+')))
+  endfor
+endfunction
+
+function! s:exit(id, data, event) abort
+  echom string(s:matched_lines)
+  let preview = 0
+  for nr in s:matched_lines
+    if nr - preview >= 3 " first matched line is 3
+      exe (preview + 1) . ',' . (nr - 1) . ':fold'
+    endif
+    let preview = nr
+  endfor
+  if line('$') - preview >=3
+      exe (preview + 1) . ',' . line('$') . ':fold'
+  endif
+endfunction

docs/cn/layers/foldsearch.md

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+---
+title: "SpaceVim foldsearch 模块"
+description: "这一模块为 SpaceVim 提供了 foldsearch 支持，实现的异步搜索折叠的功能。"
+lang: zh
+---
+
+# [可用模块](../) >> foldsearch
+
+<!-- vim-markdown-toc GFM -->
+
+- [模块简介](#模块简介)
+- [启用模块](#启用模块)
+- [快捷键](#快捷键)
+
+<!-- vim-markdown-toc -->
+
+## 模块简介
+
+这一模块为 SpaceVim 提供了 foldsearch 支持，实现的异步搜索折叠的功能。
+
+## 启用模块
+
+可通过在配置文件内加入如下配置来启用该模块：
+
+```toml
+[[layers]]
+  name = "foldsearch"
+```
+
+## 快捷键
+
+| 快捷键    | 功能描述        |
+| --------- | --------------- |
+| `SPC F w` | Foldsearch word |

docs/layers/foldsearch.md

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+---
+title: "SpaceVim foldsearch layer"
+description: "This layer provides functions that fold away lines that don't match a specific search pattern."
+---
+
+# [Available Layers](../) >> foldsearch
+
+<!-- vim-markdown-toc GFM -->
+
+- [Description](#description)
+- [Key bindings](#key-bindings)
+
+<!-- vim-markdown-toc -->
+
+## Description
+
+This layer provides functions that fold away lines that don't match a specific search pattern.
+The search pattern can be a word or a regular expression. To enable this layer:
+
+```toml
+[layers]
+    name = "foldsearch"
+```
+
+## Key bindings
+
+| Key bindings | Description           |
+| ------------ | --------------------- |
+| `SPC F w`    | foldsearch input word |