53 lines
1.3 KiB
Go
53 lines
1.3 KiB
Go
package args
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import (
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"fmt"
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"regexp"
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"github.com/mattn/go-shellwords"
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)
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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 and does correct splitting of the arg list.
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func ParseAndReplace(args string, env map[string]string) ([]string, error) {
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// Set up parser.
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p := shellwords.NewParser()
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p.ParseEnv = false
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p.ParseBacktick = false
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parsed, err := p.Parse(args)
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if err != nil {
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return nil, fmt.Errorf("Couldn't parse args %v: %v", args, err)
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}
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replaced := make([]string, len(parsed))
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for i, arg := range parsed {
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replaced[i] = ReplaceEnv(arg, env)
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}
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return replaced, nil
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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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