29 lines
1.3 KiB
TypeScript
29 lines
1.3 KiB
TypeScript
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export type TerminalModifier = 'ctrl' | 'alt';
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export type TerminalQuickKey = 'esc' | 'tab' | 'enter' | 'arrow-up' | 'arrow-down' | 'arrow-left' | 'arrow-right';
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const sequences: Record<TerminalQuickKey, string> = {
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esc: '\u001b', tab: '\t', enter: '\r',
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'arrow-up': '\u001b[A', 'arrow-down': '\u001b[B', 'arrow-left': '\u001b[D', 'arrow-right': '\u001b[C',
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};
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export const terminalSequenceForKey = (key: TerminalQuickKey, modifier: TerminalModifier | null): string => {
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if (modifier && key.startsWith('arrow-')) {
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const suffix = modifier === 'ctrl' ? '5' : '3';
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const direction = { 'arrow-up': 'A', 'arrow-down': 'B', 'arrow-right': 'C', 'arrow-left': 'D' }[key as 'arrow-up' | 'arrow-down' | 'arrow-right' | 'arrow-left'];
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return `\u001b[1;${suffix}${direction}`;
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}
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return sequences[key];
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};
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export const terminalControlCharacter = (value: string): string | null => {
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const character = value[0]?.toUpperCase();
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if (!character || character < 'A' || character > 'Z') return null;
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return String.fromCharCode(character.charCodeAt(0) & 0b11111);
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};
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export const applyTerminalModifier = (value: string, modifier: TerminalModifier): string => {
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if (!value) return value;
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if (modifier === 'ctrl') return terminalControlCharacter(value) ?? value;
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return value.length === 1 && value !== '\u001b' ? `\u001b${value}` : value;
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};
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