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package app
import (
"bytes"
"os/exec"
"sync/atomic"
"git.sr.ht/~rjarry/aerc/config"
"git.sr.ht/~rjarry/aerc/lib/log"
"git.sr.ht/~rjarry/aerc/lib/state"
"git.sr.ht/~rjarry/aerc/lib/ui"
"git.sr.ht/~rockorager/vaxis"
"git.sr.ht/~rockorager/vaxis/widgets/term"
)
type HasTerminal interface {
Terminal() *Terminal
}
type Terminal struct {
// Bell was rung in the terminal since it last had focus.
bell bool
closed int32
visible int32 // visible if >0
cmd *exec.Cmd
ctx *ui.Context
focus bool
vterm *term.Model
running bool
tab *ui.Tab
// The window title set by the application running in the terminal.
title string
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: term.New(),
visible: 1,
}
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) {
if ctx.Width() == 0 || ctx.Height() == 0 {
return
}
term.ctx = ctx
if !term.running && term.cmd != nil {
term.vterm.Attach(term.HandleEvent)
w, h := ctx.Window().Size()
if err := term.vterm.StartWithSize(term.cmd, w, h); 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(ctx.Window())
}
func (term *Terminal) Show(visible bool) {
if visible {
atomic.StoreInt32(&term.visible, 1)
} else {
atomic.StoreInt32(&term.visible, 0)
}
}
func (term *Terminal) Terminal() *Terminal {
return term
}
func (term *Terminal) MouseEvent(localX int, localY int, event vaxis.Event) {
ev, ok := event.(vaxis.Mouse)
if !ok {
return
}
if term.OnEvent != nil {
term.OnEvent(ev)
}
if term.isClosed() {
return
}
ev.Row = localY
ev.Col = localX
term.vterm.Update(ev)
}
func (term *Terminal) Focus(focus bool) {
if term.isClosed() {
return
}
term.focus = focus
term.bell = false
if term.focus {
term.vterm.Focus()
} else {
term.vterm.Blur()
}
term.setTitle()
ui.Invalidate()
}
// HandleEvent is used to watch the underlying terminal events
func (t *Terminal) HandleEvent(ev vaxis.Event) {
if t.isClosed() {
return
}
switch ev := ev.(type) {
case vaxis.Redraw:
if atomic.LoadInt32(&t.visible) > 0 {
ui.Invalidate()
}
case term.EventTitle:
t.title = string(ev)
t.setTitle()
ui.Invalidate()
if t.OnTitle != nil {
t.OnTitle(string(ev))
}
case term.EventClosed:
t.Close()
ui.Invalidate()
case term.EventBell:
if !t.focus {
t.bell = true
t.setTitle()
ui.Invalidate()
}
aerc.Beep()
}
}
func (term *Terminal) Event(event vaxis.Event) bool {
if term.OnEvent != nil {
if term.OnEvent(event) {
return true
}
}
if term.isClosed() {
return false
}
term.vterm.Update(event)
return true
}
// Renders the terminal tab title based on the template, falls back to the
// unformatted title in case of errors.
func (t *Terminal) RenderTitle() string {
title := t.title
if title == "" {
title = t.cmd.Path
}
data := state.NewDataSetter()
data.SetTitle(title)
data.SetBell(t.bell)
var buf bytes.Buffer
if err := config.Ui.TabTitleTerminal.Execute(&buf, data); err != nil {
PushError("failed to render terminal tab title: " + err.Error())
return title
}
return buf.String()
}
func (t *Terminal) SetTab(tab *ui.Tab) {
t.tab = tab
}
func (t *Terminal) setTitle() {
if t.tab != nil {
t.tab.SetTitle(t.RenderTitle())
}
}
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