forked from ebhomengo/niki
77 lines
2.0 KiB
Go
77 lines
2.0 KiB
Go
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package opts
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import (
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"bufio"
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"bytes"
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"fmt"
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"os"
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"strings"
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"unicode"
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"unicode/utf8"
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)
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const whiteSpaces = " \t"
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// ErrBadKey typed error for bad environment variable
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type ErrBadKey struct {
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msg string
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}
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func (e ErrBadKey) Error() string {
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return fmt.Sprintf("poorly formatted environment: %s", e.msg)
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}
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func parseKeyValueFile(filename string, emptyFn func(string) (string, bool)) ([]string, error) {
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fh, err := os.Open(filename)
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if err != nil {
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return []string{}, err
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}
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defer fh.Close()
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lines := []string{}
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scanner := bufio.NewScanner(fh)
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currentLine := 0
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utf8bom := []byte{0xEF, 0xBB, 0xBF}
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for scanner.Scan() {
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scannedBytes := scanner.Bytes()
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if !utf8.Valid(scannedBytes) {
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return []string{}, fmt.Errorf("env file %s contains invalid utf8 bytes at line %d: %v", filename, currentLine+1, scannedBytes)
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}
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// We trim UTF8 BOM
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if currentLine == 0 {
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scannedBytes = bytes.TrimPrefix(scannedBytes, utf8bom)
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}
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// trim the line from all leading whitespace first
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line := strings.TrimLeftFunc(string(scannedBytes), unicode.IsSpace)
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currentLine++
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// line is not empty, and not starting with '#'
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if len(line) > 0 && !strings.HasPrefix(line, "#") {
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variable, value, hasValue := strings.Cut(line, "=")
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// trim the front of a variable, but nothing else
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variable = strings.TrimLeft(variable, whiteSpaces)
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if strings.ContainsAny(variable, whiteSpaces) {
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return []string{}, ErrBadKey{fmt.Sprintf("variable '%s' contains whitespaces", variable)}
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}
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if len(variable) == 0 {
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return []string{}, ErrBadKey{fmt.Sprintf("no variable name on line '%s'", line)}
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}
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if hasValue {
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// pass the value through, no trimming
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lines = append(lines, variable+"="+value)
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} else {
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var present bool
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if emptyFn != nil {
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value, present = emptyFn(line)
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}
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if present {
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// if only a pass-through variable is given, clean it up.
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lines = append(lines, strings.TrimSpace(variable)+"="+value)
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}
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}
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}
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}
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return lines, scanner.Err()
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}
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