shahondin1624
31300cc2a2
The previous commit referenced shared/ansi.ts, shared/format.ts, and shared/ctx.ts but those files were filtered by the default-deny .gitignore. Adding !/shared/ to the allowlist so the imports actually resolve in a fresh clone. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
48 lines
1.6 KiB
TypeScript
48 lines
1.6 KiB
TypeScript
/**
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* ANSI escape-sequence helpers shared across extensions.
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*
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* Kept free of relative imports so Node's --experimental-strip-types can load
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* this directly in tests.
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*/
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export const ANSI_RESET_FG = "\x1b[39m";
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export const ANSI_RESET_ALL = "\x1b[0m";
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/**
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* Convert `#rrggbb` (or `#rgb`) to [r, g, b] bytes. Throws on malformed input
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* rather than silently producing NaN — previously the callers built broken
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* ANSI codes out of `\x1b[38;2;NaN;NaN;NaNm` which some terminals render as
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* bright cyan, giving mysterious color bugs.
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*/
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export function hexToRgb(hex: string): [number, number, number] {
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const m = hex.trim().replace(/^#/, "");
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const expanded =
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m.length === 3 ? m.split("").map((c) => c + c).join("") : m;
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if (!/^[0-9a-fA-F]{6}$/.test(expanded)) {
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throw new Error(`Invalid hex color: ${hex}`);
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}
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const n = parseInt(expanded, 16);
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return [(n >> 16) & 0xff, (n >> 8) & 0xff, n & 0xff];
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}
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/** Build a 24-bit foreground ANSI escape for an `#rrggbb` hex color. */
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export function fgFromHex(hex: string): string {
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const [r, g, b] = hexToRgb(hex);
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return `\x1b[38;2;${r};${g};${b}m`;
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}
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/**
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* Strip every ANSI CSI escape sequence from a string. Useful when the
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* renderer needs to know the visible width of a line that contains color
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* codes.
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*/
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export function stripAnsi(s: string): string {
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// biome-ignore lint/suspicious/noControlCharactersInRegex: CSI stripping is the point
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return s.replace(/\x1b\[[0-9;]*[a-zA-Z]/g, "");
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}
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/** Count visible grapheme-less characters. Mirrors pi-tui's visibleWidth. */
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export function visibleWidth(s: string): number {
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return stripAnsi(s).length;
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}
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