Function readInstructions

try/dockerlayers/main.go:350–399

(path string)

}

func readInstructions(path string) ([]rawInstruction, error) {
	file, err := os.Open(path)
	if err != nil {
		return nil, err
	}
	defer file.Close()

	scanner := bufio.NewScanner(file)
	var instructions []rawInstruction
	var current strings.Builder
	var currentLine int

	for line := 1; scanner.Scan(); line++ {
		text := scanner.Text()
		trimmed := strings.TrimSpace(text)
		if trimmed == "" || strings.HasPrefix(trimmed, "#") {
			continue
		}

		lineWithoutInlineComment := removeInlineComment(trimmed)
		if lineWithoutInlineComment == "" {
			continue
		}

		if current.Len() == 0 {
			currentLine = line
		} else {
			current.WriteString(" ")
		}
		linePart, carries := stripContinuation(lineWithoutInlineComment)
		current.WriteString(linePart)

		if !carries {
			instructions = append(instructions, rawInstruction{
				line: currentLine,
				text: current.String(),
			})
			current.Reset()
		}
	}

	if err := scanner.Err(); err != nil {
		return nil, err
	}
	if current.Len() != 0 {
		return nil, errors.New("unterminated line continuation at end of file")
	}

	return instructions, nil
}

func stripContinuation(line string) (string, bool) {
	if strings.HasSuffix(line, "\\") {