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package ui
import (
"hash/fnv"
"github.com/gdamore/tcell/v2"
"github.com/mattn/go-runewidth"
)
var condition runewidth.Condition = runewidth.Condition{}
func runeWidth(r rune) int {
return condition.RuneWidth(r)
}
func truncate(s string, w int, tail string) string {
return condition.Truncate(s, w, tail)
}
type widthBuffer struct {
width int
color colorBuffer
}
func (wb *widthBuffer) Width() int {
return wb.width
}
func (wb *widthBuffer) WriteString(s string) {
for _, r := range s {
wb.WriteRune(r)
}
}
func (wb *widthBuffer) WriteRune(r rune) {
if ok := wb.color.WriteRune(r); ok != 0 {
if 1 < ok {
wb.width++
}
wb.width += runeWidth(r)
}
}
func StringWidth(s string) int {
var wb widthBuffer
wb.WriteString(s)
return wb.Width()
}
type StyleBuffer struct {
st tcell.Style
color colorBuffer
bold bool
reverse bool
italic bool
strikethrough bool
underline bool
}
func (sb *StyleBuffer) Reset() {
sb.color.Reset()
sb.st = tcell.StyleDefault
sb.bold = false
sb.reverse = false
sb.italic = false
sb.strikethrough = false
sb.underline = false
}
func (sb *StyleBuffer) WriteRune(r rune) (st tcell.Style, ok int) {
if r == 0x00 || r == 0x0F {
sb.Reset()
return sb.st, 0
}
if r == 0x02 {
sb.bold = !sb.bold
sb.st = sb.st.Bold(sb.bold)
return sb.st, 0
}
if r == 0x16 {
sb.reverse = !sb.reverse
sb.st = st.Reverse(sb.reverse)
return sb.st, 0
}
if r == 0x1D {
sb.italic = !sb.italic
sb.st = st.Italic(sb.italic)
return sb.st, 0
}
if r == 0x1E {
sb.strikethrough = !sb.strikethrough
sb.st = st.StrikeThrough(sb.strikethrough)
return sb.st, 0
}
if r == 0x1F {
sb.underline = !sb.underline
sb.st = st.Underline(sb.underline)
return sb.st, 0
}
if ok = sb.color.WriteRune(r); ok != 0 {
sb.st = sb.color.Style(sb.st)
}
return sb.st, ok
}
type colorBuffer struct {
state int
fg, bg int
}
func (cb *colorBuffer) Reset() {
cb.state = 0
cb.fg = -1
cb.bg = -1
}
func (cb *colorBuffer) Style(st tcell.Style) tcell.Style {
if 0 <= cb.fg {
st = st.Foreground(colorFromCode(cb.fg))
} else {
st = st.Foreground(tcell.ColorDefault)
}
if 0 <= cb.bg {
st = st.Background(colorFromCode(cb.bg))
} else {
st = st.Background(tcell.ColorDefault)
}
return st
}
func (cb *colorBuffer) WriteRune(r rune) (ok int) {
if cb.state == 1 {
if '0' <= r && r <= '9' {
cb.fg = int(r - '0')
cb.state = 2
return
}
} else if cb.state == 2 {
if '0' <= r && r <= '9' {
cb.fg = 10*cb.fg + int(r-'0')
cb.state = 3
return
}
if r == ',' {
cb.state = 4
return
}
} else if cb.state == 3 {
if r == ',' {
cb.state = 4
return
}
} else if cb.state == 4 {
if '0' <= r && r <= '9' {
cb.bg = int(r - '0')
cb.state = 5
return
}
ok++
} else if cb.state == 5 {
cb.state = 0
if '0' <= r && r <= '9' {
cb.bg = 10*cb.bg + int(r-'0')
return
}
}
if r == 0x03 {
cb.state = 1
cb.fg = -1
cb.bg = -1
return
}
cb.state = 0
ok++
return
}
const (
ColorWhite = iota
ColorBlack
ColorBlue
ColorGreen
ColorRed
)
// Taken from <https://modern.ircdocs.horse/formatting.html>
var baseCodes = []tcell.Color{
tcell.ColorWhite, tcell.ColorBlack, tcell.ColorBlue, tcell.ColorGreen,
tcell.ColorRed, tcell.ColorBrown, tcell.ColorPurple, tcell.ColorOrange,
tcell.ColorYellow, tcell.ColorLightGreen, tcell.ColorTeal, tcell.ColorLightCyan,
tcell.ColorLightBlue, tcell.ColorPink, tcell.ColorGrey, tcell.ColorLightGrey,
}
var ansiCodes = []uint64{
/* 16-27 */ 52, 94, 100, 58, 22, 29, 23, 24, 17, 54, 53, 89,
/* 28-39 */ 88, 130, 142, 64, 28, 35, 30, 25, 18, 91, 90, 125,
/* 40-51 */ 124, 166, 184, 106, 34, 49, 37, 33, 19, 129, 127, 161,
/* 52-63 */ 196, 208, 226, 154, 46, 86, 51, 75, 21, 171, 201, 198,
/* 64-75 */ 203, 215, 227, 191, 83, 122, 87, 111, 63, 177, 207, 205,
/* 76-87 */ 217, 223, 229, 193, 157, 158, 159, 153, 147, 183, 219, 212,
/* 88-98 */ 16, 233, 235, 237, 239, 241, 244, 247, 250, 254, 231,
}
var hexCodes = []int32{
0x470000, 0x472100, 0x474700, 0x324700, 0x004700, 0x00472c, 0x004747, 0x002747, 0x000047, 0x2e0047, 0x470047, 0x47002a,
0x740000, 0x743a00, 0x747400, 0x517400, 0x007400, 0x007449, 0x007474, 0x004074, 0x000074, 0x4b0074, 0x740074, 0x740045,
0xb50000, 0xb56300, 0xb5b500, 0x7db500, 0x00b500, 0x00b571, 0x00b5b5, 0x0063b5, 0x0000b5, 0x7500b5, 0xb500b5, 0xb5006b,
0xff0000, 0xff8c00, 0xffff00, 0xb2ff00, 0x00ff00, 0x00ffa0, 0x00ffff, 0x008cff, 0x0000ff, 0xa500ff, 0xff00ff, 0xff0098,
0xff5959, 0xffb459, 0xffff71, 0xcfff60, 0x6fff6f, 0x65ffc9, 0x6dffff, 0x59b4ff, 0x5959ff, 0xc459ff, 0xff66ff, 0xff59bc,
0xff9c9c, 0xffd39c, 0xffff9c, 0xe2ff9c, 0x9cff9c, 0x9cffdb, 0x9cffff, 0x9cd3ff, 0x9c9cff, 0xdc9cff, 0xff9cff, 0xff94d3,
0x000000, 0x131313, 0x282828, 0x363636, 0x4d4d4d, 0x656565, 0x818181, 0x9f9f9f, 0xbcbcbc, 0xe2e2e2, 0xffffff,
}
func colorFromCode(code int) (color tcell.Color) {
if code < 0 || 99 <= code {
color = tcell.ColorDefault
} else if code < 16 {
color = baseCodes[code]
} else {
color = tcell.NewHexColor(hexCodes[code-16])
}
return
}
// see <https://modern.ircdocs.horse/formatting.html>
var identColorBlacklist = []int{1, 8, 16, 27, 28, 88, 89, 90, 91}
func IdentColor(s string) (code int) {
h := fnv.New32()
_, _ = h.Write([]byte(s))
code = int(h.Sum32()) % (99 - len(identColorBlacklist))
for _, c := range identColorBlacklist {
if c <= code {
code++
}
}
return
}
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