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// Copyright 2014 The gocui Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package main
import (
"fmt"
"log"
"os"
"github.com/awesome-gocui/gocui"
colorful "github.com/lucasb-eyer/go-colorful"
)
var dark = false
func main() {
os.Setenv("COLORTERM", "truecolor")
g, err := gocui.NewGui(gocui.OutputTrue, true)
if err != nil {
log.Panicln(err)
}
defer g.Close()
g.SetManagerFunc(layout)
if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
log.Panicln(err)
}
if err := g.SetKeybinding("", gocui.KeyCtrlR, gocui.ModNone, func(g *gocui.Gui, v *gocui.View) error {
if dark {
dark = false
} else {
dark = true
}
displayHsv(v)
return nil
}); err != nil {
log.Panicln(err)
}
if err := g.MainLoop(); err != nil && !gocui.IsQuit(err) {
log.Panicln(err)
}
}
func layout(g *gocui.Gui) error {
maxX, maxY := g.Size()
rows := 33
cols := 182
if maxY < rows {
rows = maxY
}
if maxX < cols {
cols = maxX
}
if v, err := g.SetView("colors", 0, 0, cols-1, rows-1, 0); err != nil {
if !gocui.IsUnknownView(err) {
return err
}
v.FrameColor = gocui.GetColor("#FFAA55")
displayHsv(v)
if _, err := g.SetCurrentView("colors"); err != nil {
return err
}
}
return nil
}
func displayHsv(v *gocui.View) {
v.Clear()
str := ""
// HSV color space (lines are value or saturation)
for i := 50; i > 0; i -= 2 {
// Hue
for j := 0; j < 360; j += 2 {
ir, ig, ib := hsv(j, i-1)
ir2, ig2, ib2 := hsv(j, i)
str += fmt.Sprintf("\x1b[48;2;%d;%d;%dm\x1b[38;2;%d;%d;%dmâ–€\x1b[0m", ir, ig, ib, ir2, ig2, ib2)
}
str += "\n"
fmt.Fprint(v, str)
str = ""
}
fmt.Fprintln(v, "\n\x1b[38;5;245mCtrl + R - Switch light/dark mode")
fmt.Fprintln(v, "\nCtrl + C - Exit\n")
fmt.Fprint(v, "Example should enable true color, but if it doesn't work run this command: \x1b[0mexport COLORTERM=truecolor")
}
func hsv(hue, sv int) (uint32, uint32, uint32) {
if !dark {
ir, ig, ib, _ := colorful.Hsv(float64(hue), float64(sv)/50, float64(1)).RGBA()
return ir >> 8, ig >> 8, ib >> 8
}
ir, ig, ib, _ := colorful.Hsv(float64(hue), float64(1), float64(sv)/50).RGBA()
return ir >> 8, ig >> 8, ib >> 8
}
func quit(g *gocui.Gui, v *gocui.View) error {
return gocui.ErrQuit
}
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