Partially implement SaveAs prompt (need to fix Deno)

src/common/all_test.ts

@@ -110,20 +110,20 @@ testSuite({
 	},
 	Document: {
 		'Document.empty': () => {
-			const doc = Document.empty();
+			const doc = Document.default();
 			assertEquals(doc.numRows, 0);
 			assertTrue(doc.isEmpty());
 			assertEquals(doc.row(0), null);
 		},
 		'Document.insertRow': () => {
-			const doc = Document.empty();
+			const doc = Document.default();
 			doc.insertRow(undefined, 'foobar');
 			assertEquals(doc.numRows, 1);
 			assertFalse(doc.isEmpty());
 			assertInstanceOf(doc.row(0), Row);
 		},
 		'Document.insert': () => {
-			const doc = Document.empty();
+			const doc = Document.default();
 			assertFalse(doc.dirty);
 			doc.insert(Position.at(0, 0), 'foobar');
 			assertEquals(doc.numRows, 1);
@@ -146,7 +146,7 @@ testSuite({
 			assertTrue(doc.dirty);
 		},
 		'Document.delete': () => {
-			const doc = Document.empty();
+			const doc = Document.default();
 			doc.insert(Position.default(), 'foobar');
 			doc.delete(Position.at(3, 0));
 			assertEquals(doc.row(0)?.toString(), 'fooar');

src/common/ansi.ts

@@ -33,7 +33,7 @@ export const Ansi = {
 	GetCursorLocation: ANSI_PREFIX + '6n',
 	InvertColor: ANSI_PREFIX + '7m',
 	ResetFormatting: ANSI_PREFIX + 'm',
-	moveCursor: function moveCursor(row: number, col: number): string {
+	moveCursor: (row: number, col: number): string => {
 		// Convert to 1-based counting
 		row++;
 		col++;

src/common/document.ts

@@ -3,13 +3,11 @@ import { getRuntime } from './runtime.ts';
 import { arrayInsert, Position } from './mod.ts';
 
 export class Document {
-	#filename: string | null;
 	#rows: Row[];
 	dirty: boolean;
 
 	private constructor() {
 		this.#rows = [];
-		this.#filename = null;
 		this.dirty = false;
 	}
 
@@ -17,7 +15,7 @@ export class Document {
 		return this.#rows.length;
 	}
 
-	public static empty(): Document {
+	public static default(): Document {
 		return new Document();
 	}
 
@@ -37,20 +35,15 @@ export class Document {
 		rawFile.split(/\r?\n/)
 			.forEach((row) => this.insertRow(this.numRows, row));
 
-		this.#filename = filename;
 		this.dirty = false;
 
 		return this;
 	}
 
-	public async save() {
-		if (this.#filename === null) {
-			return;
-		}
-
+	public async save(filename: string) {
 		const { file } = await getRuntime();
 
-		await file.saveFile(this.#filename, this.rowsToString());
+		await file.saveFile(filename, this.rowsToString());
 
 		this.dirty = false;
 	}

src/common/editor.ts

@@ -2,6 +2,7 @@ import Ansi, { KeyCommand } from './ansi.ts';
 import Buffer from './buffer.ts';
 import Document from './document.ts';
 import {
+	getRuntime,
 	isControl,
 	ITerminalSize,
 	logToFile,
@@ -74,7 +75,7 @@ class Editor {
 
 		this.#cursor = Position.default();
 		this.#offset = Position.default();
-		this.#document = Document.empty();
+		this.#document = Document.default();
 	}
 
 	private get numRows(): number {
@@ -92,6 +93,20 @@ class Editor {
 		return this;
 	}
 
+	public async save(): Promise<void> {
+		if (this.#filename === '') {
+			const filename = await this.prompt('Save as: ');
+			if (filename === null) {
+				return;
+			}
+
+			this.#filename = filename;
+		}
+
+		await this.#document.save(this.#filename);
+		this.setStatusMessage(`${this.#filename} was saved to disk.`);
+	}
+
 	// --------------------------------------------------------------------------
 	// Command/input mapping
 	// --------------------------------------------------------------------------
@@ -106,8 +121,7 @@ class Editor {
 			// Ctrl-key chords
 			// ----------------------------------------------------------------------
 			case ctrlKey('s'):
-				await this.#document.save();
-				this.setStatusMessage(`${this.#filename} was saved to disk.`);
+				await this.save();
 				break;
 
 			case ctrlKey('q'):
@@ -210,6 +224,33 @@ class Editor {
 		return true;
 	}
 
+	public async prompt(p: string): Promise<string | null> {
+		const { term } = await getRuntime();
+
+		let res = '';
+
+		while (true) {
+			this.setStatusMessage(`${p}${res}`);
+			await this.refreshScreen();
+			const chunk = await term.inputLoop().next();
+			const char = chunk.value!;
+			// End the prompt
+			if (char === KeyCommand.Enter) {
+				this.setStatusMessage('');
+				if (res.length === 0) {
+					return null;
+				}
+
+				return res;
+			}
+
+			// Add to the prompt result
+			if (!isControl(char)) {
+				res += char;
+			}
+		}
+	}
+
 	/**
 	 * Filter out any additional unwanted keyboard input
 	 * @param input

src/common/main.ts

@@ -23,7 +23,6 @@ export async function main() {
 
 	// Create the editor itself
 	const editor = new Editor(terminalSize);
-	editor.setStatusMessage('HELP: Ctrl-S = save | Ctrl-Q = quit');
 
 	// Process cli arguments
 	if (term.argv.length > 0) {
@@ -33,6 +32,8 @@ export async function main() {
 		}
 	}
 
+	editor.setStatusMessage('HELP: Ctrl-S = save | Ctrl-Q = quit');
+
 	// Clear the screen
 	await editor.refreshScreen();