53 lines
2.2 KiB
TypeScript
53 lines
2.2 KiB
TypeScript
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// ghostty-web 0.4.0 leaves recycled rows dirty after default SGR resets (#138).
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// Keep the theme background explicit until a stable release includes the upstream WASM fix.
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const DEFAULT_BACKGROUND_RESETS = ['\u001b[0m', '\u001b[m'] as const;
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const parseCssRgb = (color: string): [number, number, number] | null => {
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const value = color.trim();
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const hex = /^#([0-9a-f]{3}|[0-9a-f]{4}|[0-9a-f]{6}|[0-9a-f]{8})$/i.exec(value)?.[1];
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if (hex) {
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const expanded = hex.length <= 4
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? hex.slice(0, 3).split('').map((part) => part + part).join('')
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: hex.slice(0, 6);
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return [
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Number.parseInt(expanded.slice(0, 2), 16),
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Number.parseInt(expanded.slice(2, 4), 16),
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Number.parseInt(expanded.slice(4, 6), 16),
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];
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}
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const rgb = /^rgba?\(\s*(\d{1,3})\s*[, ]\s*(\d{1,3})\s*[, ]\s*(\d{1,3})(?:\s*[,/]\s*[\d.]+)?\s*\)$/i.exec(value);
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if (!rgb) return null;
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const channels = rgb.slice(1, 4).map(Number);
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if (channels.some((channel) => channel < 0 || channel > 255)) return null;
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return channels as [number, number, number];
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};
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export const getGhosttySafeResetSequence = (background: string): string | null => {
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const rgb = parseCssRgb(background);
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return rgb ? `\u001b[0;48;2;${rgb[0]};${rgb[1]};${rgb[2]}m` : null;
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};
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export const rewriteGhosttyDefaultBackgroundResets = (
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data: string,
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carry: string,
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safeReset: string | null,
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): { data: string; carry: string } => {
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const combined = carry + data;
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if (!safeReset) return { data: combined, carry: '' };
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let carryLength = 0;
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const maxPrefixLength = Math.max(...DEFAULT_BACKGROUND_RESETS.map((reset) => reset.length)) - 1;
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for (let length = 1; length <= Math.min(maxPrefixLength, combined.length); length += 1) {
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const suffix = combined.slice(-length);
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if (DEFAULT_BACKGROUND_RESETS.some((reset) => reset.length > suffix.length && reset.startsWith(suffix))) {
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carryLength = length;
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}
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}
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const nextCarry = carryLength > 0 ? combined.slice(-carryLength) : '';
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let output = carryLength > 0 ? combined.slice(0, -carryLength) : combined;
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for (const reset of DEFAULT_BACKGROUND_RESETS) output = output.replaceAll(reset, safeReset);
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return { data: output, carry: nextCarry };
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};
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