feat(list): c_CTRL-R in coc-list insert mode (#1088)

* feat(list): c_CTRL-R in coc-list insert mode

* additional description for insertregister

doc/coc.cnx

@@ -1360,6 +1360,7 @@ LIST MAPPINGS 					*coc-list-mappings*
 <C-n>       - 切换到下一个历史匹配输入。
 <C-p>       - 切换到上一个历史匹配输入。
 <C-s>       - 切换过滤匹配模式。
+<C-r>       - 从 vim 寄存器插入内容。
 <Tab>       - 选择操作项。
 
 正常模式下默认快捷键：
@@ -1428,6 +1429,7 @@ s           - 执行 'split' 操作.
 	'deletebackward' - 删除后一个字符
 	'removetail' - 删除后面全部字符
 	'removeahead' - 删除前面全部字符
+	'insertregister' - 从 vim 寄存器插入内容
 	'paste' - 插入系统粘贴板内容到当前位置
 'eval' - 执行 viml 表达式并将结果插入到当前位置
 'action' - 执行特定操作，使用 <tab> 查看当前列表支持操作

doc/coc.txt

@@ -2044,6 +2044,7 @@ Default mappings in insert mode:
 <C-n>       - navigate to next input in history.
 <C-p>       - navigate to previous input in history.
 <C-s>       - switch matcher for filter items.
+<C-r>       - insert content from vim register.
 <Tab>       - select action.
 
 Default mappings in normal mode:
@@ -2115,6 +2116,7 @@ The mapping expression should be `command:arguments`, available commands:
 	'deletebackward' - remove next character.
 	'removetail' - remove characters afterwards.
 	'removeahead' - remove character ahead.
+	'insertregister' - insert content from vim register.
 	'paste' - append text from system clipboard to prompt.
 'eval' - append text to prompt from result of viml expression.
 'action' - execute action of list, use <tab> to find available actions.

src/list/mappings.ts

@@ -70,6 +70,9 @@ export default class Mappings {
     this.add('insert', '<C-u>', () => {
       prompt.removeAhead()
     })
+    this.add('insert', '<C-r>', () => {
+      return prompt.insertRegister()
+    })
     this.add('insert', '<C-d>', () => {
       return manager.feedkeys('<C-d>')
     })
@@ -307,6 +310,9 @@ export default class Mappings {
           return prompt.removeTail()
         case 'removeahead':
           return prompt.removeAhead()
+        case 'insertregister':
+          await prompt.insertRegister()
+          return
         case 'paste':
           await prompt.paste()
           return

src/list/prompt.ts

@@ -179,6 +179,15 @@ export default class Prompt {
     this.addText(ch)
   }
 
+  public async insertRegister(): Promise<void> {
+    let ch = await this.nvim.eval('nr2char(getchar())') as string
+    if (/^[0-9a-z"%#*+/:\-.]$/.test(ch)) {
+      let text = await this.nvim.call('getreg', ch) as string
+      text = text.replace(/\n/g, '')
+      this.addText(text)
+    }
+  }
+
   public async paste(): Promise<void> {
     await this.eval('@*')
   }