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26 lines
523 B
Go
26 lines
523 B
Go
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package envtemplate
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import (
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"bytes"
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"io"
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"os"
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"github.com/valyala/fasttemplate"
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)
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// Replace replaces `%{ENV_VAR}` placeholders in b with the corresponding ENV_VAR values.
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func Replace(b []byte) []byte {
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if !bytes.Contains(b, []byte("%{")) {
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// Fast path - nothing to replace.
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return b
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}
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s := fasttemplate.ExecuteFuncString(string(b), "%{", "}", func(w io.Writer, tag string) (int, error) {
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v := os.Getenv(tag)
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if v == "" {
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v = "%{" + tag + "}"
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}
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return w.Write([]byte(v))
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})
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return []byte(s)
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}
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