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package main
import (
"context"
"log"
"os"
uv "github.com/charmbracelet/ultraviolet"
"github.com/charmbracelet/ultraviolet/screen"
"github.com/charmbracelet/x/ansi"
)
func main() {
// Create a new terminal screen
t := uv.NewTerminal(os.Stdin, os.Stdout, os.Environ())
// Or simply use...
// t := uv.DefaultTerminal()
// Create a new program
// Start the program
if err := t.Start(); err != nil {
log.Fatalf("failed to start program: %v", err)
}
fixed := uv.Rect(10, 10, 40, 20)
display := func() {
// Display the frame with the styled string
// We want the component to occupy the given area which is the
// entire screen because we're using the alternate screen buffer.
screen.FillArea(t, &uv.Cell{
Content: " ",
Style: uv.Style{Fg: ansi.Red},
}, fixed)
// We will use the StyledString component to simplify displaying
// text on the screen.
ss := uv.NewStyledString("Hello, World!")
carea := fixed
carea.Min.X = (carea.Max.X / 2) - 6
carea.Min.Y = (carea.Max.Y / 2) - 1
carea.Max.X = carea.Min.X + 12
carea.Max.Y = carea.Min.Y + 1
ss.Draw(t, carea)
if err := t.Display(); err != nil {
log.Fatal(err)
}
}
// We want to be able to stop the terminal input loop
// whenever we call cancel().
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
// This will block until we close the events
// channel or cancel the context.
LOOP:
for {
select {
case <-ctx.Done():
break LOOP
case ev := <-t.Events():
switch ev := ev.(type) {
case uv.WindowSizeEvent:
t.Resize(ev.Width, ev.Height)
t.Erase()
case uv.KeyPressEvent:
if ev.MatchString("q", "ctrl+c") {
cancel() // This will stop the loop
} else if ev.MatchString("ctrl+z") {
t.Erase()
if err := t.Display(); err != nil {
log.Fatal(err)
}
if t.Pause() != nil {
log.Fatal("failed to shutdown terminal")
}
uv.Suspend()
if err := t.Resume(); err != nil {
log.Fatal("failed to resume terminal")
}
}
}
}
display()
}
if err := t.Shutdown(context.Background()); err != nil {
log.Fatal(err)
}
}
func init() {
f, err := os.OpenFile("uv_debug.log", os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0o644)
if err != nil {
log.Fatalf("failed to open log file: %v", err)
}
log.SetOutput(f)
}
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