32 lines
765 B
TypeScript
32 lines
765 B
TypeScript
export const DEFAULT_TRIM = 8;
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/**
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* Prefix `val` with `fill` until it is at least `min` characters.
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*/
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export function leftPad(val: string, min = DEFAULT_TRIM, fill = '0'): string {
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if (val.length < min) {
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const len = min - val.length;
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const pre = Array(len).fill(fill).join('').slice(0, len);
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return `${pre}${val}`;
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} else {
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return val;
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}
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}
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/**
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* Return the start of `val`, up to `max` characters. If `val` is longer than `max` and there is room,
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* suffix with `tail`.
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*/
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export function trim(val: string, max: number, tail = '...'): string {
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if (val.length <= max) {
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return val;
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}
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if (max < tail.length) {
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return val.substr(0, max);
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}
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const start = val.substr(0, max - tail.length);
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return `${start}${tail}`;
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}
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