38 lines
970 B
Go
38 lines
970 B
Go
package args
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import "regexp"
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var (
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envRe = regexp.MustCompile(`\$({[a-zA-Z0-9_]+}|[a-zA-Z0-9_]+)`)
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)
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// ParseAndReplace takes the user supplied args and a map of environment
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// variables. It replaces any instance of an environment variable in the args
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// with the actual value.
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func ParseAndReplace(args []string, env map[string]string) []string {
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replaced := make([]string, len(args))
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for i, arg := range args {
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replaced[i] = ReplaceEnv(arg, env)
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}
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return replaced
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}
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// ReplaceEnv takes an arg and replaces all occurences of environment variables.
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// If the variable is found in the passed map it is replaced, otherwise the
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// original string is returned.
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func ReplaceEnv(arg string, env map[string]string) string {
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return envRe.ReplaceAllStringFunc(arg, func(arg string) string {
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stripped := arg[1:]
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if stripped[0] == '{' {
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stripped = stripped[1 : len(stripped)-1]
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}
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if value, ok := env[stripped]; ok {
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return value
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}
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return arg
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})
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}
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