76 lines
1.3 KiB
Go
76 lines
1.3 KiB
Go
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package main
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import (
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"bufio"
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"flag"
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"fmt"
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"io"
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"os"
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"os/exec"
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"regexp"
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)
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var (
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EnvFilePath = flag.String("f", ".env", "environment file")
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EnvVarRegex = regexp.MustCompile(`^(.*?)=(.*?)$`)
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EnvCommentRegex = regexp.MustCompile(`^[ \t]*#.*?$`)
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)
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func main() {
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flag.Parse()
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envFile, err := os.Open(*EnvFilePath)
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if err != nil {
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panic(err)
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}
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defer envFile.Close()
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envVars := parseEnvFile(envFile)
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args := flag.Args()
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newEnv := append(os.Environ(), envVars...)
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if len(args) == 0 {
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for _, envVar := range newEnv {
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fmt.Println(envVar)
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}
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return
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}
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cmd := exec.Command(args[0], args[1:]...)
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cmd.Env = newEnv
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cmd.Stdin = os.Stdin
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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if err := cmd.Run(); err != nil {
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if exitErr, ok := err.(*exec.ExitError); ok {
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os.Exit(exitErr.ExitCode())
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return
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} else {
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panic(err)
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}
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}
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}
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func parseEnvFile(r io.Reader) []string {
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env := make([]string, 0)
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s := bufio.NewScanner(r)
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l := 0
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for s.Scan() {
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l++
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matches := EnvVarRegex.FindStringSubmatch(s.Text())
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if len(matches) != 0 {
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key, value := matches[1], os.ExpandEnv(matches[2])
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env = append(env, fmt.Sprintf("%s=%s", key, value))
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} else if !EnvCommentRegex.MatchString(s.Text()) {
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panic(fmt.Sprintf("invalid env syntax on line %d", l))
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}
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}
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return env
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}
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