An option to show the colon at the start of the command line box (#2064)

* Added an option to show the colon at the start of the command line box

README.md

@@ -165,6 +165,10 @@ We have removed this option, due to it making VSCodeVim's performance suffer imm
     * etc.
 * Type: Boolean (Default: `true`)
 
+#### `"vim.cmdLineInitialColon"`
+* Set this to have VSCodeVim mimick Vim, showing the ':' colon character in the Vim command line when it is called.
+* Type: Boolean (Default: `false`)
+
 #### `"vim.handleKeys"`
 * Allows user to select certain modifier keybindings and delegate them back to VSCode so that VSCodeVim does not process them.
 * Complete list of keys that can be delegated back to VSCode can be found in our [package.json](https://github.com/VSCodeVim/Vim/blob/master/package.json#L44). Each key that has a vim.use<C-...> in the when argument can be delegated back to vscode by doing "<C-...>":false.

package.json

@@ -541,11 +541,16 @@
         "vim.substituteGlobalFlag": {
           "type": "boolean",
           "description": "Automatically apply the global flag, /g, to substitute commands. When set to true, use /g to mean only first match should be replaced.",
-          "default": "false"
+          "default": false
         },
         "vim.cursorStylePerMode": {
           "type": "object",
           "description": "Customize cursor style per mode"
+        },
+        "vim.cmdLineInitialColon": {
+          "type": "boolean",
+          "description": "When typing a command show the initial colon ':' character",
+          "default": false
         }
       }
     }

src/cmd_line/main.ts

@@ -16,14 +16,21 @@ export async function showCmdLine(
 
   const options: vscode.InputBoxOptions = {
     prompt: 'Vim command line',
-    value: initialText,
+    value: Configuration.cmdLineInitialColon ? ':' + initialText : initialText,
     ignoreFocusOut: true,
-    valueSelection: [initialText.length, initialText.length],
+    valueSelection: [
+      Configuration.cmdLineInitialColon ? initialText.length + 1 : initialText.length,
+      Configuration.cmdLineInitialColon ? initialText.length + 1 : initialText.length,
+    ],
   };
 
   try {
     const cmdString = await vscode.window.showInputBox(options);
-    await runCmdLine(cmdString!, modeHandler);
+    const trimmedCmdString =
+      cmdString && Configuration.cmdLineInitialColon && cmdString[0] === ':'
+        ? cmdString.slice(1)
+        : cmdString;
+    await runCmdLine(trimmedCmdString!, modeHandler);
     return;
   } catch (e) {
     modeHandler.setStatusBarText(e.toString());

src/configuration/configuration.ts

@@ -324,6 +324,11 @@ class ConfigurationClass {
     visualblock: undefined,
     replace: undefined,
   };
+
+  /**
+   * When typing a command show the initial colon ':' character
+   */
+  cmdLineInitialColon = false;
 }
 
 function overlapSetting(args: {