spellweaver

/**
 * Inject values into a template string.
 */
export function inject(template, ...values) {
    const strings = template;
    const adjValues = [];
    for (let i = 0; i < values.length; ++i) {
        const prevLines = strings[i].split('\n');
        const currLine = prevLines[prevLines.length - 1];
        const padLen = padLength(currLine);
        const padding = ' '.repeat(padLen);
        const value = `${values[i]}`;
        let pad = '';
        const valueLines = [];
        for (const line of value.split('\n')) {
            valueLines.push(pad + line);
            pad = padding;
        }
        adjValues.push(valueLines.join('\n'));
    }
    return unindent(template, ...adjValues);
}
/**
 * Calculate the padding at the start of the string.
 */
function padLength(s) {
    return s.length - s.trimStart().length;
}
export function unindent(str, ...values) {
    const s = typeof str === 'string' ? str : String.raw({ raw: str }, ...values);
    return _unindent(s);
}
/**
 * Remove the left padding from a multi-line string.
 */
function _unindent(str) {
    const lines = str.split('\n');
    let curPad = str.length;
    for (const line of lines) {
        if (!line.trim())
            continue;
        curPad = Math.min(curPad, padLength(line));
    }
    return lines.map((line) => line.slice(curPad)).join('\n');
}
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