text.go

package tui

import (
	"unicode/utf8"

	runewidth "github.com/mattn/go-runewidth"
)

// runeWidth returns the cell width of given rune
func runeWidth(r rune) int {
	return runewidth.RuneWidth(r)
}

// stringWidth returns the cell width of given string
func stringWidth(s string) int {
	return runewidth.StringWidth(s)
}

// trimRightLen returns s with n runes trimmed off
func trimRightLen(s string, n int) string {
	if n <= 0 {
		return s
	}
	c := utf8.RuneCountInString(s)
	runeCount := 0
	var i int
	for i = range s {
		if runeCount >= c-n {
			break
		}
		runeCount++
	}
	return s[:i]
}