fix: cursor movements & escaping suggestions (#98)

Signed-off-by: Chapman Pendery <cpendery@vt.edu>

src/ui/suggestionManager.ts

@@ -119,7 +119,9 @@ export class SuggestionManager {
   update(input: Buffer): "handled" | "fully-handled" | false {
     const keyStroke = parseKeystroke(input);
     if (keyStroke == null) return false;
-    if (keyStroke == "up") {
+    if (keyStroke == "esc") {
+      this.#suggestBlob = undefined;
+    } else if (keyStroke == "up") {
       this.#activeSuggestionIdx = Math.max(0, this.#activeSuggestionIdx - 1);
     } else if (keyStroke == "down") {
       this.#activeSuggestionIdx = Math.min(this.#activeSuggestionIdx + 1, (this.#suggestBlob?.suggestions.length ?? 1) - 1);
@@ -130,9 +132,6 @@ export class SuggestionManager {
         return false;
       }
       this.#term.write(removals + chars);
-    } else if (keyStroke == "right-arrow") {
-      this.#term.write("\t");
-      return "fully-handled";
     }
     return "handled";
   }

src/ui/ui-root.ts

@@ -113,7 +113,7 @@ export const render = async (shell: Shell) => {
     const suggestionResult = suggestionManager.update(d);
     if (previousSuggestionsColumns > 0 && suggestionResult == "handled") {
       term.noop();
-    } else if (!suggestionResult) {
+    } else if (suggestionResult != "fully-handled") {
       term.write(inputModifier(d));
     }
   });

src/utils/ansi.ts

@@ -1,6 +1,7 @@
 // Copyright (c) Microsoft Corporation.
 // Licensed under the MIT License.
 
+const ESC = "\u001B";
 const CSI = "\u001B[";
 const OSC = "\u001B]";
 const BEL = "\u0007";
@@ -34,7 +35,7 @@ export const eraseLinesBelow = (count = 1) => {
   return [...Array(count).keys()].map(() => cursorNextLine + eraseLine).join("");
 };
 
-export const parseKeystroke = (b: Buffer): "up" | "down" | "tab" | "right-arrow" | undefined => {
+export const parseKeystroke = (b: Buffer): "up" | "down" | "tab" | "esc" | undefined => {
   let s: string;
   if (b[0] > 127 && b[1] === undefined) {
     b[0] -= 128;
@@ -43,13 +44,13 @@ export const parseKeystroke = (b: Buffer): "up" | "down" | "tab" | "right-arrow"
     s = String(b);
   }
 
-  if (s == CSI + "A" || s == SS3 + "A") {
+  if (s == ESC) {
+    return "esc";
+  } else if (s == CSI + "A" || s == SS3 + "A") {
     return "up";
   } else if (s == CSI + "B" || s == SS3 + "B") {
     return "down";
   } else if (s == "\t") {
     return "tab";
-  } else if (s == CSI + "D" || s == SS3 + "D" || s == CSI + "d" || s == SS3 + "d") {
-    return "right-arrow";
   }
 };