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package app
import (
"os/exec"
"sync/atomic"
"git.sr.ht/~rjarry/aerc/config"
"git.sr.ht/~rjarry/aerc/lib/ui"
"git.sr.ht/~rjarry/aerc/log"
tcellterm "git.sr.ht/~rockorager/tcell-term"
"git.sr.ht/~rockorager/vaxis"
"github.com/gdamore/tcell/v2"
)
type HasTerminal interface {
Terminal() *Terminal
}
type Terminal struct {
closed int32
cmd *exec.Cmd
ctx *ui.Context
focus bool
visible bool
vterm *tcellterm.VT
running bool
OnClose func(err error)
OnEvent func(event vaxis.Event) bool
OnStart func()
OnTitle func(title string)
}
func NewTerminal(cmd *exec.Cmd) (*Terminal, error) {
term := &Terminal{
cmd: cmd,
vterm: tcellterm.New(),
visible: true,
}
term.vterm.OSC8 = config.General.EnableOSC8
term.vterm.TERM = config.General.Term
return term, nil
}
func (term *Terminal) Close() {
term.closeErr(nil)
}
// TODO: replace with atomic.Bool when min go version will have it (1.19+)
const closed int32 = 1
func (term *Terminal) isClosed() bool {
return atomic.LoadInt32(&term.closed) == closed
}
func (term *Terminal) closeErr(err error) {
if atomic.SwapInt32(&term.closed, closed) == closed {
return
}
if term.vterm != nil {
// Stop receiving events
term.vterm.Detach()
term.vterm.Close()
if term.ctx != nil {
term.ctx.HideCursor()
}
}
if term.OnClose != nil {
term.OnClose(err)
}
ui.Invalidate()
}
func (term *Terminal) Destroy() {
// If we destroy, we don't want to call the OnClose callback
term.OnClose = nil
term.closeErr(nil)
}
func (term *Terminal) Invalidate() {
ui.Invalidate()
}
func (term *Terminal) Draw(ctx *ui.Context) {
term.vterm.SetSurface(ctx)
w, h := ctx.Size()
if !term.isClosed() && term.ctx != nil {
ow, oh := term.ctx.Size()
if w != ow || h != oh {
term.vterm.Resize(w, h)
}
}
term.ctx = ctx
if !term.running && term.cmd != nil {
term.vterm.Attach(term.HandleEvent)
if err := term.vterm.Start(term.cmd); err != nil {
log.Errorf("error running terminal: %v", err)
term.closeErr(err)
return
}
term.running = true
if term.OnStart != nil {
term.OnStart()
}
}
term.vterm.Draw()
if term.focus {
y, x, style, vis := term.vterm.Cursor()
if vis && !term.isClosed() {
ctx.SetCursor(x, y, vaxis.CursorStyle(style))
} else {
ctx.HideCursor()
}
}
}
func (term *Terminal) Show(visible bool) {
term.visible = visible
}
func (term *Terminal) Terminal() *Terminal {
return term
}
func (term *Terminal) MouseEvent(localX int, localY int, event vaxis.Event) {
ev, ok := event.(*tcell.EventMouse)
if !ok {
return
}
if term.OnEvent != nil {
term.OnEvent(ev)
}
if term.isClosed() {
return
}
e := tcell.NewEventMouse(localX, localY, ev.Buttons(), ev.Modifiers())
term.vterm.HandleEvent(e)
}
func (term *Terminal) Focus(focus bool) {
if term.isClosed() {
return
}
term.focus = focus
if term.ctx != nil {
if !term.focus {
term.ctx.HideCursor()
} else {
y, x, style, _ := term.vterm.Cursor()
term.ctx.SetCursor(x, y, vaxis.CursorStyle(style))
term.Invalidate()
}
}
}
// HandleEvent is used to watch the underlying terminal events
func (term *Terminal) HandleEvent(ev tcell.Event) {
if term.isClosed() {
return
}
switch ev := ev.(type) {
case *tcellterm.EventRedraw:
if term.visible {
ui.Invalidate()
}
case *tcellterm.EventTitle:
if term.OnTitle != nil {
term.OnTitle(ev.Title())
}
case *tcellterm.EventClosed:
term.Close()
ui.Invalidate()
}
}
func (term *Terminal) Event(event vaxis.Event) bool {
if term.OnEvent != nil {
if term.OnEvent(event) {
return true
}
}
if term.isClosed() {
return false
}
return term.vterm.HandleEvent(event)
}
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