forked from yesnault/termui
/
helper.go
151 lines (116 loc) · 2.76 KB
/
helper.go
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// Copyright 2015 Zack Guo <gizak@icloud.com>. All rights reserved.
// Use of this source code is governed by a MIT license that can
// be found in the LICENSE file.
package termui
import (
"regexp"
"strings"
tm "github.com/nsf/termbox-go"
)
import rw "github.com/mattn/go-runewidth"
/* ---------------Port from termbox-go --------------------- */
// Attribute is printable cell's color and style.
type Attribute uint16
const (
ColorDefault Attribute = iota
ColorBlack
ColorRed
ColorGreen
ColorYellow
ColorBlue
ColorMagenta
ColorCyan
ColorWhite
)
const NumberofColors = 8 //Have a constant that defines number of colors
const (
AttrBold Attribute = 1 << (iota + 9)
AttrUnderline
AttrReverse
)
var (
dot = "…"
dotw = rw.StringWidth(dot)
)
/* ----------------------- End ----------------------------- */
func toTmAttr(x Attribute) tm.Attribute {
return tm.Attribute(x)
}
func str2runes(s string) []rune {
return []rune(s)
}
// Here for backwards-compatibility.
func trimStr2Runes(s string, w int) []rune {
return TrimStr2Runes(s, w)
}
// TrimStr2Runes trims string to w[-1 rune], appends …, and returns the runes
// of that string if string is grather then n. If string is small then w,
// return the runes.
func TrimStr2Runes(s string, w int) []rune {
if w <= 0 {
return []rune{}
}
sw := rw.StringWidth(s)
if sw > w {
return []rune(rw.Truncate(s, w, dot))
}
return str2runes(s)
}
// TrimStrIfAppropriate trim string to "s[:-1] + …"
// if string > width otherwise return string
func TrimStrIfAppropriate(s string, w int) string {
if w <= 0 {
return ""
}
sw := rw.StringWidth(s)
if sw > w {
return rw.Truncate(s, w, dot)
}
return s
}
func strWidth(s string) int {
return rw.StringWidth(s)
}
func charWidth(ch rune) int {
return rw.RuneWidth(ch)
}
var whiteSpaceRegex = regexp.MustCompile(`\s`)
// StringToAttribute converts text to a termui attribute. You may specifiy more
// then one attribute like that: "BLACK, BOLD, ...". All whitespaces
// are ignored.
func StringToAttribute(text string) Attribute {
text = whiteSpaceRegex.ReplaceAllString(strings.ToLower(text), "")
attributes := strings.Split(text, ",")
result := Attribute(0)
for _, theAttribute := range attributes {
var match Attribute
switch theAttribute {
case "reset", "default":
match = ColorDefault
case "black":
match = ColorBlack
case "red":
match = ColorRed
case "green":
match = ColorGreen
case "yellow":
match = ColorYellow
case "blue":
match = ColorBlue
case "magenta":
match = ColorMagenta
case "cyan":
match = ColorCyan
case "white":
match = ColorWhite
case "bold":
match = AttrBold
case "underline":
match = AttrUnderline
case "reverse":
match = AttrReverse
}
result |= match
}
return result
}