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package ff
import (
"bufio"
"fmt"
"io"
"strconv"
"strings"
)
// EnvParser is a parser for .env files. Each line is tokenized on the first `=`
// character. The first token is interpreted as the flag name, and the second
// token is interpreted as the value. Both tokens are trimmed of leading and
// trailing whitespace. If the value is "double quoted", control characters like
// `\n` are expanded. Lines beginning with `#` are interpreted as comments.
//
// EnvParser respects WithEnvVarPrefix, e.g. an .env file containing `A_B=c`
// will set a flag named "b" if Parse is called with WithEnvVarPrefix("A").
func EnvParser(r io.Reader, set func(name, value string) error) error {
s := bufio.NewScanner(r)
for s.Scan() {
line := strings.TrimSpace(s.Text())
if line == "" {
continue // skip empties
}
if line[0] == '#' {
continue // skip comments
}
index := strings.IndexRune(line, '=')
if index < 0 {
return fmt.Errorf("invalid line: %s", line)
}
var (
name = strings.TrimSpace(line[:index])
value = strings.TrimSpace(line[index+1:])
)
if len(name) <= 0 {
return fmt.Errorf("invalid line: %s", line)
}
if len(value) <= 0 {
return fmt.Errorf("invalid line: %s", line)
}
if unquoted, err := strconv.Unquote(value); err == nil {
value = unquoted
}
if err := set(name, value); err != nil {
return err
}
}
return nil
}
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