Alexey Khit
32 lines
470 B
Go
32 lines
470 B
Go
package shell
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import (
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"os"
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"regexp"
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"strings"
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)
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func ReplaceEnvVars(text string) string {
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re := regexp.MustCompile(`\${([^}{]+)}`)
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return re.ReplaceAllStringFunc(text, func(match string) string {
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key := match[2 : len(match)-1]
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var def string
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i := strings.IndexByte(key, ':')
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if i > 0 {
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key, def = key[:i], key[i+1:]
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}
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value, exists := os.LookupEnv(key)
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if exists {
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return value
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}
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if def != "" {
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return def
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}
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return match
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})
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}
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