15 lines
414 B
JavaScript
15 lines
414 B
JavaScript
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// replace any ${ENV} values with the appropriate environ.
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const envExpr = /(?<!\\)(\\*)\$\{([^${}]+)\}/g
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module.exports = (f, env) => f.replace(envExpr, (orig, esc, name) => {
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const val = env[name] !== undefined ? env[name] : `$\{${name}}`
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// consume the escape chars that are relevant.
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if (esc.length % 2) {
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return orig.slice((esc.length + 1) / 2)
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}
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return (esc.slice(esc.length / 2)) + val
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})
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