feat: avoid control characters in cmdline

Author: lambdalisue

denops/fall/component/input.ts

@@ -216,10 +216,6 @@ export class InputComponent extends BaseComponent {
       2,
     );
 
-    // TODO:
-    // When 'cmdline' includes control characters that is displayed like '^Y', the display width
-    // is not equal to the length of the string. So we need to slice 'middle' to fit in the cmdwidth
-    // properly.
     const spacer = " ".repeat(cmdwidth);
     const middle = `${this.#cmdline}${spacer}`.slice(
       this.#offset,

denops/fall/util/cmdliner.ts

@@ -7,6 +7,9 @@ import { collect } from "jsr:@denops/std@^7.3.2/batch";
 
 import { dispatch } from "../event.ts";
 
+// deno-lint-ignore no-control-regex
+const CONTROL_CHARACTERS = /[\x00-\x1f\x7f]/g;
+
 export class Cmdliner {
   #cmdline: string;
   #cmdpos: number;
@@ -72,6 +75,14 @@ export class Cmdliner {
       // Not in command-line mode
       return;
     }
+    // Check control characters in cmdline
+    if (CONTROL_CHARACTERS.test(cmdline)) {
+      // remove control characters
+      await fn.setcmdline(denops, cmdline.replace(CONTROL_CHARACTERS, ""));
+      // retry check
+      await this.check(denops);
+      return;
+    }
     if (cmdline !== this.#cmdline) {
       dispatch({ type: "vim-cmdline-changed", cmdline });
     }