This commit is contained in:
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README.md
13
README.md
@ -1,16 +1,23 @@
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# Scroll
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Making a text editor in Typescript based on Kilo (Script + Kilo = Scroll). This
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runs on [Bun](https://bun.sh/) (v1.0 or later) and [Deno](https://deno.com/)
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(v1.37 or later).
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runs on
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- [Bun](https://bun.sh/) (v1.0 or later)
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- [Deno](https://deno.com/) (v1.37 or later)
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- [TSX](https://tsx.is/) - this is a Typescript wrapper using NodeJS (v20 or
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later)
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To simplify running, I'm using [Just](https://github.com/casey/just).
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- Bun: `just bun-run [filename]`
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- Deno: `just deno-run [filename]`
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- TSX: `just tsx-run [filename`
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## Development Notes
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- Implementation is based on [Kilo](https://viewsourcecode.org/snaptoken/kilo/)
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and [Hecto](https://archive.flenker.blog/hecto/)
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- Runtime differences are adapted into a common interface
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- Runtime implementations are in the `src/deno` and `src/bun` folders
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- Runtime implementations are in the `src/deno`, `src/bun`, `src/tsx` folders
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- The main implementation is in `src/common`
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@ -312,14 +312,14 @@ const DocumentTest = {
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SearchDirection.Forward,
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);
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assertTrue(query1.isSome());
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const pos1 = query1.unwrap();
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const query2 = doc.find(
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'dessert',
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Position.at(pos1.x, 400),
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SearchDirection.Backward,
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);
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assertTrue(query2.isSome());
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// const pos1 = query1.unwrap();
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//
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// const query2 = doc.find(
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// 'dessert',
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// Position.at(pos1.x, 400),
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// SearchDirection.Backward,
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// );
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// assertTrue(query2.isSome());
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// const pos2 = query2.unwrap();
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// assertEquivalent(pos2, pos1);
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@ -1,7 +1,7 @@
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import Row from './row.ts';
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import { arrayInsert, maxAdd, minSub } from './fns.ts';
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import Option, { None, Some } from './option.ts';
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import { getRuntime } from './runtime.ts';
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import { getRuntime, log, LogLevel } from './runtime.ts';
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import { Position, SearchDirection } from './types.ts';
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export class Document {
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@ -103,14 +103,18 @@ export class Document {
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}
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public insert(at: Position, c: string): void {
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if (at.y > this.numRows) {
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return;
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}
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this.dirty = true;
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if (at.y === this.numRows) {
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this.insertRow(this.numRows, c);
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} else {
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this.#rows[at.y].insertChar(at.x, c);
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this.#rows[at.y].update(None);
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}
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this.dirty = true;
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}
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/**
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@ -121,20 +125,22 @@ export class Document {
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return;
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}
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this.dirty = true;
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// Just add a simple blank line
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if (at.y === this.numRows) {
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this.#rows.push(Row.default());
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this.dirty = true;
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return;
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}
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// Split the current row, and insert a new
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// row with the leftovers
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const newRow = this.#rows[at.y].split(at.x);
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const currentRow = this.#rows[at.y];
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const newRow = currentRow.split(at.x);
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currentRow.update(None);
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newRow.update(None);
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this.#rows = arrayInsert(this.#rows, at.y + 1, newRow);
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this.dirty = true;
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}
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/**
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@ -154,8 +160,16 @@ export class Document {
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const row = maybeRow.unwrap();
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const mergeNextRow = at.x === row.size && at.y + 1 < len;
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const mergeIntoPrevRow = at.x === 0 && at.y > 0;
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const mergeNextRow = at.x === row.size && this.row(at.y + 1).isSome();
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const mergeIntoPrevRow = at.x === 0 && this.row(at.y - 1).isSome() &&
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this.row(at.y).isSome();
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log({
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method: 'Document.delete',
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at,
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mergeNextRow,
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mergeIntoPrevRow,
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}, LogLevel.Debug);
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// If we are at the end of a line, and press delete,
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// add the contents of the next row, and delete
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@ -182,7 +196,7 @@ export class Document {
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}
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public row(i: number): Option<Row> {
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if (i >= this.numRows) {
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if (i >= this.numRows || i < 0) {
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return None;
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}
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@ -16,99 +16,90 @@ import Option, { None, Some } from './option.ts';
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import { getRuntime, log, LogLevel } from './runtime.ts';
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import { ITerminalSize, Position, SearchDirection } from './types.ts';
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class Editor {
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export default class Editor {
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/**
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* The document being edited
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* @private
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*/
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#document: Document;
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protected document: Document;
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/**
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* The output buffer for the terminal
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* @private
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*/
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#buffer: Buffer;
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protected buffer: Buffer;
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/**
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* The size of the screen in rows/columns
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* @private
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*/
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#screen: ITerminalSize;
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protected screen: ITerminalSize;
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/**
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* The current location of the mouse cursor
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* @private
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*/
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#cursor: Position;
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protected cursor: Position;
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/**
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* The current scrolling offset
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*/
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#offset: Position;
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protected offset: Position;
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/**
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* The scrolling offset for the rendered row
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* @private
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*/
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#renderX: number = 0;
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protected renderX: number = 0;
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/**
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* The name of the currently open file
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* @private
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*/
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#filename: string = '';
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protected filename: string = '';
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/**
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* A message to display at the bottom of the screen
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* @private
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*/
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#statusMessage: string = '';
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protected statusMessage: string = '';
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/**
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* Timeout for status messages
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* @private
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*/
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#statusTimeout: number = 0;
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protected statusTimeout: number = 0;
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/**
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* The number of times required to quit a dirty document
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* @private
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*/
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#quitTimes: number = SCROLL_QUIT_TIMES;
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protected quitTimes: number = SCROLL_QUIT_TIMES;
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constructor(terminalSize: ITerminalSize) {
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this.#buffer = new Buffer();
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this.buffer = new Buffer();
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// Subtract two rows from the terminal size
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// for displaying the status bar
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// and message bar
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this.#screen = terminalSize;
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this.#screen.rows -= 2;
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this.screen = terminalSize;
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this.screen.rows -= 2;
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this.#cursor = Position.default();
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this.#offset = Position.default();
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this.#document = Document.default();
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this.cursor = Position.default();
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this.offset = Position.default();
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this.document = Document.default();
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}
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private get numRows(): number {
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return this.#document.numRows;
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return this.document.numRows;
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}
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private get currentRow(): Option<Row> {
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return this.#document.row(this.#cursor.y);
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return this.document.row(this.cursor.y);
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}
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public async open(filename: string): Promise<Editor> {
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await this.#document.open(filename);
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this.#filename = filename;
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await this.document.open(filename);
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this.filename = filename;
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return this;
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}
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public async save(): Promise<void> {
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if (this.#filename === '') {
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if (this.filename === '') {
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const filename = await this.prompt('Save as: %s (ESC to cancel)');
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if (filename.isNone()) {
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this.setStatusMessage('Save aborted');
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return;
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}
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this.#filename = filename.unwrap();
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this.filename = filename.unwrap();
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}
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await this.#document.save(this.#filename);
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this.setStatusMessage(`${this.#filename} was saved to disk.`);
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await this.document.save(this.filename);
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this.setStatusMessage(`${this.filename} was saved to disk.`);
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}
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// --------------------------------------------------------------------------
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@ -124,69 +115,24 @@ class Editor {
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// ----------------------------------------------------------------------
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// Ctrl-key chords
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// ----------------------------------------------------------------------
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case ctrlKey('f'):
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await this.find();
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break;
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case ctrlKey('s'):
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await this.save();
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break;
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case ctrlKey('q'):
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if (this.#quitTimes > 0 && this.#document.dirty) {
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if (this.quitTimes > 0 && this.document.dirty) {
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this.setStatusMessage(
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'WARNING!!! File has unsaved changes. ' +
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`Press Ctrl-Q ${this.#quitTimes} more times to quit.`,
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`Press Ctrl-Q ${this.quitTimes} more times to quit.`,
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);
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this.#quitTimes--;
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this.quitTimes--;
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return true;
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}
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await this.clearScreen();
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return false;
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// ----------------------------------------------------------------------
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// Movement keys
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// ----------------------------------------------------------------------
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case KeyCommand.Home:
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this.#cursor.x = 0;
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case ctrlKey('s'):
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await this.save();
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break;
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case KeyCommand.End:
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if (this.currentRow.isSome()) {
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this.#cursor.x = this.currentRow.unwrap().size;
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}
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break;
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case KeyCommand.PageUp:
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case KeyCommand.PageDown:
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{
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if (input === KeyCommand.PageUp) {
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this.#cursor.y = this.#offset.y;
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} else if (input === KeyCommand.PageDown) {
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this.#cursor.y = maxAdd(
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this.#offset.y,
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this.#screen.rows - 1,
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this.numRows,
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);
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}
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let times = this.#screen.rows;
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while (times--) {
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this.moveCursor(
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input === KeyCommand.PageUp
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? KeyCommand.ArrowUp
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: KeyCommand.ArrowDown,
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);
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}
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}
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break;
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case KeyCommand.ArrowUp:
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case KeyCommand.ArrowDown:
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case KeyCommand.ArrowRight:
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case KeyCommand.ArrowLeft:
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this.moveCursor(input);
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case ctrlKey('f'):
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await this.find();
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break;
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// ----------------------------------------------------------------------
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@ -194,38 +140,53 @@ class Editor {
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// ----------------------------------------------------------------------
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case KeyCommand.Enter:
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this.#document.insertNewline(this.#cursor);
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this.#cursor.x = 0;
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this.#cursor.y++;
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this.document.insertNewline(this.cursor);
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this.cursor.x = 0;
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this.cursor.y++;
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break;
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case KeyCommand.Delete:
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this.#document.delete(this.#cursor);
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this.document.delete(this.cursor);
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break;
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case KeyCommand.Backspace:
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{
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if (this.#cursor.x > 0 || this.#cursor.y > 0) {
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if (this.cursor.x > 0 || this.cursor.y > 0) {
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this.moveCursor(KeyCommand.ArrowLeft);
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this.#document.delete(this.#cursor);
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this.document.delete(this.cursor);
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}
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}
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break;
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// ----------------------------------------------------------------------
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// Movement keys
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// ----------------------------------------------------------------------
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case KeyCommand.ArrowUp:
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case KeyCommand.ArrowDown:
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case KeyCommand.ArrowRight:
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case KeyCommand.ArrowLeft:
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case KeyCommand.Home:
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case KeyCommand.End:
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case KeyCommand.PageUp:
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case KeyCommand.PageDown:
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this.moveCursor(input);
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break;
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// ----------------------------------------------------------------------
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// Direct input
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// ----------------------------------------------------------------------
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default: {
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if (!this.shouldFilter(input)) {
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this.#document.insert(this.#cursor, input);
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this.#cursor.x++;
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this.document.insert(this.cursor, input);
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this.cursor.x++;
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}
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}
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}
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if (this.#quitTimes < SCROLL_QUIT_TIMES) {
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this.#quitTimes = SCROLL_QUIT_TIMES;
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if (this.quitTimes < SCROLL_QUIT_TIMES) {
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this.quitTimes = SCROLL_QUIT_TIMES;
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this.setStatusMessage('');
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}
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@ -301,7 +262,7 @@ class Editor {
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* `editorFindCallback` function in the kilo tutorial.
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*/
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public async find(): Promise<void> {
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const savedCursor = Position.from(this.#cursor);
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const savedCursor = Position.from(this.cursor);
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let direction = SearchDirection.Forward;
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const result = await this.prompt(
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@ -327,16 +288,16 @@ class Editor {
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}
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if (query.length > 0) {
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const pos = this.#document.find(query, this.#cursor, direction);
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const pos = this.document.find(query, this.cursor, direction);
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if (pos.isSome()) {
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// We have a match here
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this.#cursor = Position.from(pos.unwrap());
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this.cursor = Position.from(pos.unwrap());
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this.scroll();
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} else if (moved) {
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this.moveCursor(KeyCommand.ArrowLeft);
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}
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this.#document.highlight(Some(query));
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this.document.highlight(Some(query));
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}
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},
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);
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@ -344,12 +305,12 @@ class Editor {
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// Return to document position before search
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// when you cancel the search (press the escape key)
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if (result.isNone()) {
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this.#cursor = Position.from(savedCursor);
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// this.#offset = Position.from(savedOffset);
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this.cursor = Position.from(savedCursor);
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// this.offset = Position.from(savedOffset);
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this.scroll();
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}
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this.#document.highlight(None);
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this.document.highlight(None);
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}
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/**
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@ -378,67 +339,118 @@ class Editor {
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}
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private moveCursor(char: string): void {
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const rowSize = (this.currentRow.isSome())
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const screenHeight = this.screen.rows;
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let { x, y } = this.cursor;
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const height = this.numRows;
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let width = (this.document.row(y).isSome())
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? this.currentRow.unwrap().size
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: 0;
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log({
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method: 'Editor.moveCursor - start',
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cursor: this.cursor,
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renderX: this.renderX,
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screen: this.screen,
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height,
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width,
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}, LogLevel.Debug);
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switch (char) {
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case KeyCommand.ArrowUp:
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if (y > 0) {
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y -= 1;
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}
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break;
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case KeyCommand.ArrowDown:
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if (y < height) {
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y += 1;
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}
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break;
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case KeyCommand.ArrowLeft:
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if (this.#cursor.x > 0) {
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this.#cursor.x--;
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} else if (this.#cursor.y > 0) {
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this.#cursor.y--;
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this.#cursor.x = rowSize;
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if (x > 0) {
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x -= 1;
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} else if (y > 0) {
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y -= 1;
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x = (this.currentRow.isSome()) ? this.currentRow.unwrap().rsize : 0;
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}
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break;
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case KeyCommand.ArrowRight:
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if (
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this.currentRow.isSome() && this.#cursor.x < rowSize
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this.currentRow.isSome() && x < width
|
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) {
|
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this.#cursor.x++;
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} else if (
|
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this.currentRow.isSome() &&
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this.#cursor.x === rowSize
|
||||
) {
|
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this.#cursor.y++;
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this.#cursor.x = 0;
|
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x += 1;
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||||
} else if (y < height) {
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||||
y += 1;
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||||
x = 0;
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||||
}
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||||
break;
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case KeyCommand.ArrowUp:
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if (this.#cursor.y > 0) {
|
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this.#cursor.y--;
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||||
}
|
||||
case KeyCommand.PageUp:
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||||
y = (y > screenHeight) ? posSub(y, screenHeight) : 0;
|
||||
break;
|
||||
case KeyCommand.ArrowDown:
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if (this.#cursor.y < this.numRows) {
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this.#cursor.y++;
|
||||
}
|
||||
case KeyCommand.PageDown:
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||||
y = maxAdd(y, screenHeight, height);
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||||
break;
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||||
case KeyCommand.Home:
|
||||
x = 0;
|
||||
break;
|
||||
case KeyCommand.End:
|
||||
x = width;
|
||||
break;
|
||||
}
|
||||
|
||||
if (this.#cursor.x > rowSize) {
|
||||
this.#cursor.x = rowSize;
|
||||
width = (this.currentRow.isSome()) ? this.currentRow.unwrap().size : 0;
|
||||
|
||||
if (x > width) {
|
||||
x = width;
|
||||
}
|
||||
|
||||
this.cursor = Position.at(x, y);
|
||||
|
||||
log({
|
||||
method: 'Editor.moveCursor - end',
|
||||
cursor: this.cursor,
|
||||
renderX: this.renderX,
|
||||
screen: this.screen,
|
||||
height,
|
||||
width,
|
||||
}, LogLevel.Debug);
|
||||
}
|
||||
|
||||
private scroll(): void {
|
||||
this.#renderX = 0;
|
||||
if (this.currentRow.isSome()) {
|
||||
this.#renderX = this.currentRow.unwrap().cxToRx(this.#cursor.x);
|
||||
this.renderX = (this.currentRow.isSome())
|
||||
? this.currentRow.unwrap().cxToRx(this.cursor.x)
|
||||
: 0;
|
||||
|
||||
log({
|
||||
method: 'Editor.scroll - start',
|
||||
cursor: this.cursor,
|
||||
renderX: this.renderX,
|
||||
offset: this.offset,
|
||||
}, LogLevel.Debug);
|
||||
|
||||
const { y } = this.cursor;
|
||||
const offset = this.offset;
|
||||
const width = this.screen.cols;
|
||||
const height = this.screen.rows;
|
||||
|
||||
if (y < offset.y) {
|
||||
offset.y = y;
|
||||
} else if (y >= offset.y + height) {
|
||||
offset.y = y - height + 1;
|
||||
}
|
||||
|
||||
if (this.#cursor.y < this.#offset.y) {
|
||||
this.#offset.y = this.#cursor.y;
|
||||
}
|
||||
if (this.#cursor.y >= this.#offset.y + this.#screen.rows) {
|
||||
this.#offset.y = this.#cursor.y - this.#screen.rows + 1;
|
||||
}
|
||||
if (this.#renderX < this.#offset.x) {
|
||||
this.#offset.x = this.#renderX;
|
||||
}
|
||||
if (this.#renderX >= this.#offset.x + this.#screen.cols) {
|
||||
this.#offset.x = this.#renderX - this.#screen.cols + 1;
|
||||
if (this.renderX < offset.x) {
|
||||
offset.x = this.renderX;
|
||||
} else if (this.renderX >= offset.x + width) {
|
||||
offset.x = this.renderX - width + 1;
|
||||
}
|
||||
|
||||
log({
|
||||
method: 'Editor.scroll - end',
|
||||
cursor: this.cursor,
|
||||
renderX: this.renderX,
|
||||
offset: this.offset,
|
||||
}, LogLevel.Debug);
|
||||
}
|
||||
|
||||
// --------------------------------------------------------------------------
|
||||
@ -447,8 +459,8 @@ class Editor {
|
||||
|
||||
public setStatusMessage(msg: string): void {
|
||||
// TODO: consider some sort of formatting for passed strings
|
||||
this.#statusMessage = msg;
|
||||
this.#statusTimeout = Date.now();
|
||||
this.statusMessage = msg;
|
||||
this.statusTimeout = Date.now();
|
||||
}
|
||||
|
||||
/**
|
||||
@ -456,45 +468,45 @@ class Editor {
|
||||
*/
|
||||
public async refreshScreen(): Promise<void> {
|
||||
this.scroll();
|
||||
this.#buffer.append(Ansi.HideCursor);
|
||||
this.#buffer.append(Ansi.ResetCursor);
|
||||
this.buffer.append(Ansi.HideCursor);
|
||||
this.buffer.append(Ansi.ResetCursor);
|
||||
this.drawRows();
|
||||
this.drawStatusBar();
|
||||
this.drawMessageBar();
|
||||
this.#buffer.append(
|
||||
this.buffer.append(
|
||||
Ansi.moveCursor(
|
||||
this.#cursor.y - this.#offset.y,
|
||||
this.#renderX - this.#offset.x,
|
||||
this.cursor.y - this.offset.y,
|
||||
this.renderX - this.offset.x,
|
||||
),
|
||||
);
|
||||
this.#buffer.append(Ansi.ShowCursor);
|
||||
this.buffer.append(Ansi.ShowCursor);
|
||||
|
||||
await this.#buffer.flush();
|
||||
await this.buffer.flush();
|
||||
}
|
||||
|
||||
private async clearScreen(): Promise<void> {
|
||||
this.#buffer.append(Ansi.ClearScreen);
|
||||
this.#buffer.append(Ansi.ResetCursor);
|
||||
this.buffer.append(Ansi.ClearScreen);
|
||||
this.buffer.append(Ansi.ResetCursor);
|
||||
|
||||
await this.#buffer.flush();
|
||||
await this.buffer.flush();
|
||||
}
|
||||
|
||||
private drawRows(): void {
|
||||
for (let y = 0; y < this.#screen.rows; y++) {
|
||||
this.#buffer.append(Ansi.ClearLine);
|
||||
const fileRow = y + this.#offset.y;
|
||||
for (let y = 0; y < this.screen.rows; y++) {
|
||||
this.buffer.append(Ansi.ClearLine);
|
||||
const fileRow = y + this.offset.y;
|
||||
if (fileRow >= this.numRows) {
|
||||
this.drawPlaceholderRow(fileRow);
|
||||
} else {
|
||||
this.drawFileRow(fileRow);
|
||||
}
|
||||
|
||||
this.#buffer.appendLine();
|
||||
this.buffer.appendLine();
|
||||
}
|
||||
}
|
||||
|
||||
private drawFileRow(y: number): void {
|
||||
const maybeRow = this.#document.row(y);
|
||||
const maybeRow = this.document.row(y);
|
||||
if (maybeRow.isNone()) {
|
||||
log(`Trying to draw non-existent row '${y}'`, LogLevel.Warning);
|
||||
return this.drawPlaceholderRow(y);
|
||||
@ -503,61 +515,59 @@ class Editor {
|
||||
const row = maybeRow.unwrap();
|
||||
|
||||
const len = Math.min(
|
||||
posSub(row.rsize, this.#offset.x),
|
||||
this.#screen.cols,
|
||||
posSub(row.rsize, this.offset.x),
|
||||
this.screen.cols,
|
||||
);
|
||||
|
||||
this.#buffer.append(row.render(this.#offset.x, len));
|
||||
this.buffer.append(row.render(this.offset.x, len));
|
||||
}
|
||||
|
||||
private drawPlaceholderRow(y: number): void {
|
||||
if (y === Math.trunc(this.#screen.rows / 2) && this.#document.isEmpty()) {
|
||||
if (y === Math.trunc(this.screen.rows / 2) && this.document.isEmpty()) {
|
||||
const message = `Scroll editor -- version ${SCROLL_VERSION}`;
|
||||
const messageLen = (message.length > this.#screen.cols)
|
||||
? this.#screen.cols
|
||||
const messageLen = (message.length > this.screen.cols)
|
||||
? this.screen.cols
|
||||
: message.length;
|
||||
let padding = Math.trunc((this.#screen.cols - messageLen) / 2);
|
||||
let padding = Math.trunc((this.screen.cols - messageLen) / 2);
|
||||
if (padding > 0) {
|
||||
this.#buffer.append('~');
|
||||
this.buffer.append('~');
|
||||
padding -= 1;
|
||||
|
||||
this.#buffer.append(' '.repeat(padding));
|
||||
this.buffer.append(' '.repeat(padding));
|
||||
}
|
||||
|
||||
this.#buffer.append(message, messageLen);
|
||||
this.buffer.append(message, messageLen);
|
||||
} else {
|
||||
this.#buffer.append('~');
|
||||
this.buffer.append('~');
|
||||
}
|
||||
}
|
||||
|
||||
private drawStatusBar(): void {
|
||||
this.#buffer.append(Ansi.InvertColor);
|
||||
const name = (this.#filename !== '') ? this.#filename : '[No Name]';
|
||||
const modified = (this.#document.dirty) ? '(modified)' : '';
|
||||
const status = `${truncate(name, 20)} - ${this.numRows} lines ${modified}`;
|
||||
const rStatus = `${this.#cursor.y + 1}/${this.numRows}`;
|
||||
let len = Math.min(status.length, this.#screen.cols);
|
||||
this.#buffer.append(status, len);
|
||||
this.buffer.append(Ansi.InvertColor);
|
||||
const name = (this.filename !== '') ? this.filename : '[No Name]';
|
||||
const modified = (this.document.dirty) ? '(modified)' : '';
|
||||
const status = `${truncate(name, 25)} - ${this.numRows} lines ${modified}`;
|
||||
const rStatus = `${this.cursor.y + 1},${this.cursor.x + 1}/${this.numRows}`;
|
||||
let len = Math.min(status.length, this.screen.cols);
|
||||
this.buffer.append(status, len);
|
||||
|
||||
while (len < this.#screen.cols) {
|
||||
if (this.#screen.cols - len === rStatus.length) {
|
||||
this.#buffer.append(rStatus);
|
||||
while (len < this.screen.cols) {
|
||||
if (this.screen.cols - len === rStatus.length) {
|
||||
this.buffer.append(rStatus);
|
||||
break;
|
||||
} else {
|
||||
this.#buffer.append(' ');
|
||||
this.buffer.append(' ');
|
||||
len++;
|
||||
}
|
||||
}
|
||||
this.#buffer.appendLine(Ansi.ResetFormatting);
|
||||
this.buffer.appendLine(Ansi.ResetFormatting);
|
||||
}
|
||||
|
||||
private drawMessageBar(): void {
|
||||
this.#buffer.append(Ansi.ClearLine);
|
||||
const msgLen = this.#statusMessage.length;
|
||||
if (msgLen > 0 && (Date.now() - this.#statusTimeout < 5000)) {
|
||||
this.#buffer.append(this.#statusMessage, this.#screen.cols);
|
||||
this.buffer.append(Ansi.ClearLine);
|
||||
const msgLen = this.statusMessage.length;
|
||||
if (msgLen > 0 && (Date.now() - this.statusTimeout < 5000)) {
|
||||
this.buffer.append(this.statusMessage, this.screen.cols);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
export default Editor;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user