Allow user to change status bar color based on mode

README.md

@@ -12,6 +12,7 @@ VSCodeVim is a [Visual Studio Code](https://code.visualstudio.com/) extension th
 * The [EasyMotion plugin](#how-to-use-easymotion)
 * The [Surround.vim plugin](#how-to-use-surround)
 * The [Commentary plugin](#how-to-use-commentary)
+* The [Vim-airline plugin](#statusbarcolorcontrol)
 * And much more! Refer to the [roadmap](ROADMAP.md) or everything we support.
 
 Please [report missing features/bugs on GitHub](https://github.com/VSCodeVim/Vim/issues), which will help us get to them faster.
@@ -213,6 +214,25 @@ Or bind ctrl+n to turn off search highlighting and `<leader>w` to save the curre
   * Use a non-blinking block cursor
   * Type: Boolean (Default: `false`)
 
+
+#### statusBarColorControl
+  * Control status bar color based on current mode
+  * Type: Boolean (Default: `false`)
+
+  Once this is set, you need to set statusBarColors as well with these exact strings for modenames. The colors can be adjusted to suit the user.
+
+```
+    "vim.statusBarColorControl": true,
+    "vim.statusBarColors" : {
+        "normal": "#005f5f",
+        "insert": "#5f0000",
+        "visual": "#5f00af",
+        "visualline": "#005f87",
+        "visualblock": "#86592d",
+        "replace": "#000000"
+    }
+```
+
 ### Vim settings we support
 
 #### ignorecase

package.json

@@ -429,6 +429,14 @@
                 "vim.handleKeys": {
                     "type": "object",
                     "description": "Option to delegate certain key combinations back to VSCode to be handled natively"
+                },
+                "vim.statusBarColorControl":{
+                    "type": "boolean",
+                    "description": "Allow VSCodeVim to change status bar color based on mode"
+                },
+                "vim.statusBarColors": {
+                    "type": "object",
+                    "description": "Customize colors per mode when VSCodeVim controls status bar colors"
                 }
             }
         }

src/configuration/configuration.ts

@@ -14,6 +14,10 @@ export interface IHandleKeys {
   [key: string]: boolean;
 }
 
+export interface IStatusBarColors {
+  [key: string]: string;
+}
+
 /**
  * Every Vim option we support should
  * 1. Be added to contribution section of `package.json`.
@@ -215,6 +219,16 @@ class ConfigurationClass {
    */
   startInInsertMode = false;
 
+  /**
+   * Start in insert mode?
+   */
+  statusBarColorControl = false;
+
+  /**
+   * Status bar colors to change to based on mode
+   */
+  statusBarColors: IStatusBarColors = {};
+
   /**
    * Color of search highlights.
    */

src/mode/modeHandler.ts

@@ -1795,12 +1795,19 @@ export class ModeHandler implements vscode.Disposable {
 
     this._vimState.editor.setDecorations(this._searchHighlightDecoration, searchRanges);
 
-
     for (let i = 0; i < this.vimState.postponedCodeViewChanges.length; i++) {
       let viewChange = this.vimState.postponedCodeViewChanges[i];
       await vscode.commands.executeCommand(viewChange.command, viewChange.args);
     }
 
+    // If user wants to change status bar color based on mode
+    if (Configuration.statusBarColorControl) {
+      let colorToSet = Configuration.statusBarColors[this._vimState.currentModeName().toLowerCase()];
+      if (colorToSet !== undefined) {
+        this.setStatusBarColor(colorToSet);
+      }
+    }
+
     this.vimState.postponedCodeViewChanges = [];
 
     if (this.currentMode.name === ModeName.SearchInProgressMode) {
@@ -1863,6 +1870,15 @@ export class ModeHandler implements vscode.Disposable {
     ModeHandler._statusBarItem.show();
   }
 
+  setStatusBarColor(color: string): void {
+    vscode.workspace.getConfiguration("workbench.experimental").update("colorCustomizations",
+      {
+        "statusBarBackground": `${color}`,
+        "statusBarNoFolderBackground": `${color}`,
+        "statusBarDebuggingBackground": `${color}`
+      });
+  }
+
   // Return true if a new undo point should be created based on brackets and parenthesis
   private createUndoPointForBrackets(vimState: VimState): boolean {
     // }])> keys all start a new undo state when directly next to an {[(< opening character