52 lines
2.0 KiB
TypeScript
52 lines
2.0 KiB
TypeScript
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/**
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* Concatenate the string fragments and interpolated values
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* to get a single string.
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*/
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function populateTemplate(strings: TemplateStringsArray, ...args: any[]) {
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const chunks = [];
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for (let i = 0; i < strings.length; i++) {
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let lastStringLineLength = 0;
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if (strings[i]) {
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chunks.push(strings[i]);
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// remember last indent of the string portion
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lastStringLineLength = strings[i].split("\n").at(-1)?.length ?? 0;
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}
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if (args[i]) {
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// if the interpolation value has newlines, indent the interpolation values
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// using the last known string indent
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chunks.push(args[i].replace(/([\r?\n])/g, "$1" + " ".repeat(lastStringLineLength)));
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}
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}
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return chunks.join("");
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}
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function trimIndentPrivate(removeEmptyLeadingAndTrailingLines: boolean, strings: TemplateStringsArray, ...args: any[]) {
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// Remove initial and final newlines
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let string = populateTemplate(strings, ...args);
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if (removeEmptyLeadingAndTrailingLines) string = string.replace(/^[\r\n]/, "").replace(/[^\S\r\n]*[\r\n]$/, "");
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const dents = string.match(/^([ \t])+/gm)?.map(s => s.length) ?? [];
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// No dents? no change required
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if (!dents || dents.length == 0) return string;
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const minDent = Math.min(...dents);
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// The min indentation is 0, no change needed
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if (!minDent) return string;
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const dedented = string.replace(new RegExp(`^${" ".repeat(minDent)}`, "gm"), "");
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return dedented;
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}
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/**
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* Shift all lines left by the *smallest* indentation level,
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* and remove initial newline and all trailing spaces.
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*/
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export default function trimIndent(strings: TemplateStringsArray, ...args: any[]) {
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return trimIndentPrivate(true, strings, ...args);
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}
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/**
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* Shift all lines left by the *smallest* indentation level,
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* and _keep_ initial newline and all trailing spaces.
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*/
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trimIndent.keepLeadingAndTrailingNewlines = function (strings: TemplateStringsArray, ...args: any[]) {
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return trimIndentPrivate(false, strings, ...args);
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};
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