76 lines
1.5 KiB
JavaScript
76 lines
1.5 KiB
JavaScript
/**
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* ANSI/VT terminal escape code handling
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*/
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export const ANSI_PREFIX = '\x1b[';
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function esc(pieces: TemplateStringsArray): string {
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return ANSI_PREFIX + pieces[0];
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}
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/**
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* ANSI escapes for various inputs
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*/
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export enum KeyCommand {
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ArrowUp = ANSI_PREFIX + 'A',
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ArrowDown = ANSI_PREFIX + 'B',
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ArrowRight = ANSI_PREFIX + 'C',
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ArrowLeft = ANSI_PREFIX + 'D',
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Delete = ANSI_PREFIX + '3~',
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PageUp = ANSI_PREFIX + '5~',
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PageDown = ANSI_PREFIX + '6~',
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// These keys have several possible escape sequences
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Home = 'LineHome',
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End = 'LineEnd',
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}
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export const Ansi = {
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ClearLine: esc`K`,
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ClearScreen: esc`2J`,
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ResetCursor: esc`H`,
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HideCursor: esc`?25l`,
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ShowCursor: esc`?25h`,
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GetCursorLocation: esc`6n`,
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moveCursor: function moveCursor(row: number, col: number): string {
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// Convert to 1-based counting
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row++;
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col++;
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return ANSI_PREFIX + `${row};${col}H`;
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},
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moveCursorForward: (col: number): string => ANSI_PREFIX + `${col}C`,
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moveCursorDown: (row: number): string => ANSI_PREFIX + `${row}B`,
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};
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const decoder = new TextDecoder();
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export function readKey(raw: Uint8Array): string {
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const parsed = decoder.decode(raw);
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// Return the input if it's unambiguous
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if (parsed in KeyCommand) {
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return parsed;
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}
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// Some keycodes have multiple potential inputs
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switch (parsed) {
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case '\x1bOH':
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case '\x1b[7~':
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case '\x1b[1~':
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case '\x1b[H':
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return KeyCommand.Home;
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case '\x1bOF':
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case '\x1b[8~':
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case '\x1b[4~':
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case '\x1b[F':
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return KeyCommand.End;
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default:
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return parsed;
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}
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}
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export default Ansi;
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