package main

import (
	"strconv"
	"strings"
)

// popBool removes every occurrence of the given flag spellings from args and
// reports whether any were present.
func popBool(args []string, names ...string) (bool, []string) {
	var rest []string
	found := false
	for _, a := range args {
		if contains(names, a) {
			found = true
			continue
		}
		rest = append(rest, a)
	}
	return found, rest
}

func contains(ss []string, s string) bool {
	for _, x := range ss {
		if x == s {
			return true
		}
	}
	return false
}

// parseClip pulls pass-style clipboard flags out of args: -c / --clip copy the
// first line; --clip=N or -cN copy line N (1-based).
func parseClip(args []string) (clip bool, line int, rest []string) {
	line = 1
	for _, a := range args {
		switch {
		case a == "-c" || a == "--clip":
			clip = true
		case strings.HasPrefix(a, "--clip="):
			clip = true
			if n, err := strconv.Atoi(a[len("--clip="):]); err == nil && n > 0 {
				line = n
			}
		case strings.HasPrefix(a, "-c") && len(a) > 2:
			clip = true
			if n, err := strconv.Atoi(a[2:]); err == nil && n > 0 {
				line = n
			}
		default:
			rest = append(rest, a)
		}
	}
	return clip, line, rest
}

func atoiDefault(s string, def int) int {
	if n, err := strconv.Atoi(s); err == nil {
		return n
	}
	return def
}