Fix some issues with line splitting/merging

.gitignore

@@ -335,8 +335,13 @@ $RECYCLE.BIN/
 
 # End of https://www.toptal.com/developers/gitignore/api/jetbrains+all,vim,node,deno,macos,windows,linux
 
+# Other editors
+.nova/
+.zed/
+
 ## Misc generated files
-scroll.err
+scroll*.log
+docs
 deno.lock
 cov_profile/
 coverage/

README.md

@@ -14,6 +14,9 @@ To simplify running, I'm using [Just](https://github.com/casey/just).
 - Deno: `just deno-run [filename]`
 - TSX: `just tsx-run [filename`
 
+Deno is generally used for dev tools, but each runtime should be functionally
+equivalent running the text editor.
+
 ## Development Notes
 
 - Implementation is based on [Kilo](https://viewsourcecode.org/snaptoken/kilo/)

justfile

@@ -6,7 +6,7 @@ default:
 coverage: bun-test deno-coverage
 
 # Typescript checking
-check: deno-check bun-check
+check: deno-check bun-check tsx-check
 
 docs:
 	deno doc --html --unstable-ffi --name="Scroll" ./src/scroll.ts ./src/common/*.ts ./src/deno/mod.ts ./src/bun/mod.ts
@@ -27,8 +27,8 @@ clean:
 	rm -rf .deno-cover
 	rm -rf coverage
 	rm -rf docs
-	rm -f scroll.log
+	rm -f scroll*.log
-	rm -f scroll.err
+	rm -f test.file
 	rm -f tsconfig.tsbuildinfo
 
 ##########################################################################################
@@ -53,8 +53,8 @@ bun-run file="":
 
 # Lint code and check types
 deno-check:
-	deno lint
+	deno task deno-lint
-	deno check --unstable-ffi  --all -c deno.jsonc ./src/deno/*.ts ./src/common/*.ts
+	deno task deno-check
 
 # Test with deno
 deno-test:
@@ -66,15 +66,20 @@ deno-coverage:
 
 # Run with deno
 deno-run file="":
-	deno run --allow-all --allow-ffi --deny-hrtime --unstable-ffi ./src/scroll.ts {{file}}
+	deno task deno-run {{file}}
+	#deno run --allow-all --allow-ffi --deny-hrtime --unstable-ffi ./src/scroll.ts {{file}}
 
 ##########################################################################################
 # tsx(Node JS)-specific commands
 ##########################################################################################
 
+# Check code with actual Typescript compiler
+tsx-check:
+	npm run tsx-check
+
 # Test with tsx (NodeJS)
 tsx-test:
-	npx tsx --test './src/common/all_test.ts'
+	npm run tsx-test
 
 # Run with tsx (NodeJS)
 tsx-run file="":

package.json

@@ -4,6 +4,16 @@
 		"bun-types": "^1.0.11"
 	},
 	"scripts": {
+		"bun-check": "bunx tsc",
+		"bun-coverage": "bun test --coverage",
+		"bun-test": "bun test",
+		"deno-lint": "deno lint",
+		"deno-check": "deno check --unstable-ffi  --all -c deno.jsonc ./src/deno/*.ts ./src/common/*.ts ./src/tsx/*.ts",
+		"deno-coverage": "./coverage.sh",
+		"deno-run": "deno run --allow-all --allow-ffi --deny-hrtime --unstable-ffi ./src/scroll.ts",
+		"deno-test": "deno test --allow-all --unstable-ffi",
+		"tsx-check": "npx tsc",
+		"tsx-test": "npx tsx --test './src/common/all_test.ts'"
 	},
 	"type": "module"
 }

src/common/all_test.ts

@@ -381,25 +381,18 @@ const DocumentTest = {
 		doc.delete(Position.at(3, 0));
 		assertEquals(doc.row(0).unwrap().toString(), 'fooar');
 
-		// Merge previous row
+		// Merge next row
 		const doc2 = Document.default();
 		doc2.insertNewline(Position.default());
 		doc2.insert(Position.at(0, 1), 'foobar');
-		doc2.delete(Position.at(0, 1));
+		doc2.delete(Position.at(0, 0));
 		assertEquals(doc2.row(0).unwrap().toString(), 'foobar');
 
-		// Merge next row
-		const doc3 = Document.default();
-		doc3.insertNewline(Position.default());
-		doc3.insert(Position.at(0, 1), 'foobar');
-		doc3.delete(Position.at(0, 0));
-		assertEquals(doc3.row(0).unwrap().toString(), 'foobar');
-
 		// Invalid delete location
-		const doc4 = Document.default();
+		const doc3 = Document.default();
-		doc4.insert(Position.default(), 'foobar');
+		doc3.insert(Position.default(), 'foobar');
-		doc4.delete(Position.at(0, 1));
+		doc3.delete(Position.at(0, 3));
-		assertEquals(doc4.row(0).unwrap().toString(), 'foobar');
+		assertEquals(doc3.row(0).unwrap().toString(), 'foobar');
 	},
 };
 

src/common/config.ts

@@ -4,8 +4,8 @@ export const SCROLL_VERSION = '0.0.1';
 export const SCROLL_QUIT_TIMES = 3;
 export const SCROLL_TAB_SIZE = 4;
 
-export const SCROLL_LOG_FILE = './scroll.log';
+export const SCROLL_LOG_FILE_PREFIX = './scroll';
-export const SCROLL_ERR_FILE = './scroll.err';
+export const SCROLL_LOG_FILE_SUFFIX = '.log';
 
 export const defaultTerminalSize: ITerminalSize = {
 	rows: 24,

src/common/document.ts

@@ -1,7 +1,7 @@
 import Row from './row.ts';
 import { arrayInsert, maxAdd, minSub } from './fns.ts';
 import Option, { None, Some } from './option.ts';
-import { getRuntime, log, LogLevel } from './runtime.ts';
+import { getRuntime, logDebug } from './runtime.ts';
 import { Position, SearchDirection } from './types.ts';
 
 export class Document {
@@ -153,6 +153,8 @@ export class Document {
 			return;
 		}
 
+		this.dirty = true;
+
 		const maybeRow = this.row(at.y);
 		if (maybeRow.isNone()) {
 			return;
@@ -161,38 +163,29 @@ export class Document {
 		const row = maybeRow.unwrap();
 
 		const mergeNextRow = at.x === row.size && this.row(at.y + 1).isSome();
-		const mergeIntoPrevRow = at.x === 0 && this.row(at.y - 1).isSome() &&
-			this.row(at.y).isSome();
 
-		log({
+		logDebug('Document.delete', {
 			method: 'Document.delete',
 			at,
 			mergeNextRow,
-			mergeIntoPrevRow,
+		});
-		}, LogLevel.Debug);
 
 		// If we are at the end of a line, and press delete,
 		// add the contents of the next row, and delete
-		// the merged row object
+		// the merged row object (This also works for pressing
+		// backspace at the beginning of a line: the cursor is
+		// moved to the end of the previous line)
 		if (mergeNextRow) {
 			// At the end of a line, pressing delete will merge
-			// the next line into the current on
+			// the next line into the current one
-			const rowToAppend = this.#rows.at(at.y + 1)!.toString();
+			const rowToAppend = this.#rows[at.y + 1].toString();
 			row.append(rowToAppend);
 			this.deleteRow(at.y + 1);
-		} else if (mergeIntoPrevRow) {
-			// At the beginning of a line, merge the current line
-			// into the previous Row
-			const rowToAppend = row.toString();
-			this.#rows[at.y - 1].append(rowToAppend);
-			this.deleteRow(at.y);
 		} else {
 			row.delete(at.x);
 		}
 
 		row.update(None);
-
-		this.dirty = true;
 	}
 
 	public row(i: number): Option<Row> {
@@ -200,7 +193,7 @@ export class Document {
 			return None;
 		}
 
-		return Option.from(this.#rows[i]);
+		return Option.from(this.#rows.at(i));
 	}
 
 	public insertRow(at: number = this.numRows, s: string = ''): void {
@@ -219,17 +212,15 @@ export class Document {
 	/**
 	 * Delete the specified row
 	 * @param at - the index of the row to delete
-	 * @private
 	 */
-	private deleteRow(at: number): void {
+	protected deleteRow(at: number): void {
 		this.#rows.splice(at, 1);
 	}
 
 	/**
 	 * Convert the array of row objects into one string
-	 * @private
 	 */
-	private rowsToString(): string {
+	protected rowsToString(): string {
 		return this.#rows.map((r) => r.toString()).join('\n');
 	}
 }

src/common/editor.ts

@@ -13,7 +13,7 @@ import {
 	truncate,
 } from './fns.ts';
 import Option, { None, Some } from './option.ts';
-import { getRuntime, log, LogLevel } from './runtime.ts';
+import { getRuntime, logDebug, logWarning } from './runtime.ts';
 import { ITerminalSize, Position, SearchDirection } from './types.ts';
 
 export default class Editor {
@@ -72,12 +72,16 @@ export default class Editor {
 		this.document = Document.default();
 	}
 
-	private get numRows(): number {
+	protected get numRows(): number {
 		return this.document.numRows;
 	}
 
-	private get currentRow(): Option<Row> {
+	protected row(at: number): Option<Row> {
-		return this.document.row(this.cursor.y);
+		return this.document.row(at);
+	}
+
+	protected get currentRow(): Option<Row> {
+		return this.row(this.cursor.y);
 	}
 
 	public async open(filename: string): Promise<Editor> {
@@ -150,12 +154,10 @@ export default class Editor {
 				break;
 
 			case KeyCommand.Backspace:
-				{
 				if (this.cursor.x > 0 || this.cursor.y > 0) {
 					this.moveCursor(KeyCommand.ArrowLeft);
 					this.document.delete(this.cursor);
 				}
-				}
 				break;
 
 			// ----------------------------------------------------------------------
@@ -317,20 +319,19 @@ export default class Editor {
 	 * Filter out any additional unwanted keyboard input
 	 *
 	 * @param input
-	 * @private
 	 */
-	private shouldFilter(input: string): boolean {
+	protected shouldFilter(input: string): boolean {
 		const isEscapeSequence = input[0] === KeyCommand.Escape;
 		const isCtrl = isControl(input);
 		const shouldFilter = isEscapeSequence || isCtrl;
 		const whitelist = ['\t'];
 
 		if (shouldFilter && !whitelist.includes(input)) {
-			log({
+			logDebug('Ignoring input:', {
-				'msg': `Ignoring input: ${input}`,
+				input,
 				isEscapeSequence,
 				isCtrl,
-			}, LogLevel.Debug);
+			});
 
 			return true;
 		}
@@ -338,22 +339,20 @@ export default class Editor {
 		return false;
 	}
 
-	private moveCursor(char: string): void {
+	protected moveCursor(char: string): void {
 		const screenHeight = this.screen.rows;
 		let { x, y } = this.cursor;
 		const height = this.numRows;
-		let width = (this.document.row(y).isSome())
+		let width = (this.row(y).isSome()) ? this.row(y).unwrap().size : 0;
-			? this.currentRow.unwrap().size
-			: 0;
 
-		log({
+		logDebug('Editor.moveCursor - start', {
-			method: 'Editor.moveCursor - start',
+			char,
 			cursor: this.cursor,
 			renderX: this.renderX,
 			screen: this.screen,
 			height,
 			width,
-		}, LogLevel.Debug);
+		});
 
 		switch (char) {
 			case KeyCommand.ArrowUp:
@@ -371,12 +370,12 @@ export default class Editor {
 					x -= 1;
 				} else if (y > 0) {
 					y -= 1;
-					x = (this.currentRow.isSome()) ? this.currentRow.unwrap().rsize : 0;
+					x = (this.row(y).isSome()) ? this.row(y).unwrap().size : 0;
 				}
 				break;
 			case KeyCommand.ArrowRight:
 				if (
-					this.currentRow.isSome() && x < width
+					this.row(y).isSome() && x < width
 				) {
 					x += 1;
 				} else if (y < height) {
@@ -398,7 +397,7 @@ export default class Editor {
 				break;
 		}
 
-		width = (this.currentRow.isSome()) ? this.currentRow.unwrap().size : 0;
+		width = (this.row(y).isSome()) ? this.row(y).unwrap().size : 0;
 
 		if (x > width) {
 			x = width;
@@ -406,27 +405,25 @@ export default class Editor {
 
 		this.cursor = Position.at(x, y);
 
-		log({
+		logDebug('Editor.moveCursor - end', {
-			method: 'Editor.moveCursor - end',
 			cursor: this.cursor,
 			renderX: this.renderX,
 			screen: this.screen,
 			height,
 			width,
-		}, LogLevel.Debug);
+		});
 	}
 
-	private scroll(): void {
+	protected scroll(): void {
-		this.renderX = (this.currentRow.isSome())
+		this.renderX = (this.row(this.cursor.y).isSome())
-			? this.currentRow.unwrap().cxToRx(this.cursor.x)
+			? this.document.row(this.cursor.y).unwrap().cxToRx(this.cursor.x)
 			: 0;
 
-		log({
+		logDebug('Editor.scroll - start', {
-			method: 'Editor.scroll - start',
 			cursor: this.cursor,
 			renderX: this.renderX,
 			offset: this.offset,
-		}, LogLevel.Debug);
+		});
 
 		const { y } = this.cursor;
 		const offset = this.offset;
@@ -445,12 +442,11 @@ export default class Editor {
 			offset.x = this.renderX - width + 1;
 		}
 
-		log({
+		logDebug('Editor.scroll - end', {
-			method: 'Editor.scroll - end',
 			cursor: this.cursor,
 			renderX: this.renderX,
 			offset: this.offset,
-		}, LogLevel.Debug);
+		});
 	}
 
 	// --------------------------------------------------------------------------
@@ -484,14 +480,14 @@ export default class Editor {
 		await this.buffer.flush();
 	}
 
-	private async clearScreen(): Promise<void> {
+	protected async clearScreen(): Promise<void> {
 		this.buffer.append(Ansi.ClearScreen);
 		this.buffer.append(Ansi.ResetCursor);
 
 		await this.buffer.flush();
 	}
 
-	private drawRows(): void {
+	protected drawRows(): void {
 		for (let y = 0; y < this.screen.rows; y++) {
 			this.buffer.append(Ansi.ClearLine);
 			const fileRow = y + this.offset.y;
@@ -505,10 +501,10 @@ export default class Editor {
 		}
 	}
 
-	private drawFileRow(y: number): void {
+	protected drawFileRow(y: number): void {
 		const maybeRow = this.document.row(y);
 		if (maybeRow.isNone()) {
-			log(`Trying to draw non-existent row '${y}'`, LogLevel.Warning);
+			logWarning(`Trying to draw non-existent row '${y}'`);
 			return this.drawPlaceholderRow(y);
 		}
 
@@ -522,7 +518,7 @@ export default class Editor {
 		this.buffer.append(row.render(this.offset.x, len));
 	}
 
-	private drawPlaceholderRow(y: number): void {
+	protected drawPlaceholderRow(y: number): void {
 		if (y === Math.trunc(this.screen.rows / 2) && this.document.isEmpty()) {
 			const message = `Scroll editor -- version ${SCROLL_VERSION}`;
 			const messageLen = (message.length > this.screen.cols)
@@ -542,7 +538,7 @@ export default class Editor {
 		}
 	}
 
-	private drawStatusBar(): void {
+	protected drawStatusBar(): void {
 		this.buffer.append(Ansi.InvertColor);
 		const name = (this.filename !== '') ? this.filename : '[No Name]';
 		const modified = (this.document.dirty) ? '(modified)' : '';
@@ -563,7 +559,7 @@ export default class Editor {
 		this.buffer.appendLine(Ansi.ResetFormatting);
 	}
 
-	private drawMessageBar(): void {
+	protected drawMessageBar(): void {
 		this.buffer.append(Ansi.ClearLine);
 		const msgLen = this.statusMessage.length;
 		if (msgLen > 0 && (Date.now() - this.statusTimeout < 5000)) {

src/common/runtime.ts

@@ -7,8 +7,8 @@ import { IRuntime, ITerminalSize, ITestBase } from './types.ts';
 import { noop } from './fns.ts';
 import {
 	defaultTerminalSize,
-	SCROLL_ERR_FILE,
+	SCROLL_LOG_FILE_PREFIX,
-	SCROLL_LOG_FILE,
+	SCROLL_LOG_FILE_SUFFIX,
 } from './config.ts';
 
 export type { IFileIO, IRuntime, ITerminal } from './types.ts';
@@ -79,24 +79,36 @@ async function _getTerminalSizeFromAnsi(): Promise<ITerminalSize> {
 	};
 }
 
-export function log(s: unknown, level: LogLevel = LogLevel.Notice): void {
+/**
+ * Basic logging -
+ */
+export function log(
+	s: unknown,
+	level: LogLevel = LogLevel.Notice,
+	data?: any,
+): void {
 	getRuntime().then(({ file }) => {
-		const raw = JSON.stringify(s, null, 2);
+		const rawS = JSON.stringify(s, null, 2);
-		const output = `${level}: ${raw}\n`;
+		const rawData = JSON.stringify(data, null, 2);
+		const output = (typeof data !== 'undefined')
+			? `${rawS}\n${rawData}\n\n`
+			: `${rawS}\n`;
 
-		const outputFile = (level === LogLevel.Error)
+		const outputFile =
-			? SCROLL_ERR_FILE
+			`${SCROLL_LOG_FILE_PREFIX}-${level.toLowerCase()}${SCROLL_LOG_FILE_SUFFIX}`;
-			: SCROLL_LOG_FILE;
 		file.appendFile(outputFile, output).then(noop);
 	});
 }
 
-/**
+export const logDebug = (s: unknown, data?: any) =>
- * Append information to the scroll.err logfile
+	log(s, LogLevel.Debug, data);
- */
+export const logInfo = (s: unknown, data?: any) => log(s, LogLevel.Info, data);
-export function logError(s: unknown): void {
+export const logNotice = (s: unknown, data?: any) =>
-	log(s, LogLevel.Error);
+	log(s, LogLevel.Notice, data);
-}
+export const logWarning = (s: unknown, data?: any) =>
+	log(s, LogLevel.Warning, data);
+export const logError = (s: unknown, data?: any) =>
+	log(s, LogLevel.Warning, data);
 
 /**
  * Kill program, displaying an error message