/
rat.go
207 lines (163 loc) · 3.69 KB
/
rat.go
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package rat
import (
"fmt"
"io"
"os"
"os/exec"
"time"
"github.com/nsf/termbox-go"
)
var (
events chan termbox.Event
done chan bool
eventHandlers HandlerRegistry
modes map[string]Mode
cfg Configurer
annotatorsDir string
keyStack []keyEvent
widgets WidgetStack
pagers PagerStack
prompt ConfirmPrompt
)
func Init() error {
if err := initTermbox(); err != nil {
return err
}
events = make(chan termbox.Event)
widgets = NewWidgetStack()
pagers = NewPagerStack()
done = make(chan bool)
eventHandlers = NewHandlerRegistry()
modes = make(map[string]Mode)
cfg = NewConfigurer()
widgets.Push(pagers)
prompt = NewConfirmPrompt()
AddEventHandler("C-c", Quit)
w, h := termbox.Size()
layout(w, h)
return nil
}
func closeTermbox() {
termbox.Close()
}
func initTermbox() error {
var err error
if err = termbox.Init(); err != nil {
return err
}
termbox.SetInputMode(termbox.InputAlt)
termbox.SetOutputMode(termbox.Output256)
return nil
}
func SetAnnotatorsDir(dir string) {
annotatorsDir = dir
}
func LoadConfig(rd io.Reader) {
cfg.Process(rd)
}
func Close() {
closeTermbox()
}
func Quit() {
close(done)
}
func Run() {
// There is a bug in this code that this go routine continues to run even if
// termbox is closed. If a SIGWINCH is triggered while termbox is closed, a
// EventResize event will be triggered with width and height set to zero
// because the tty fd that termbox uses to get the terminal window size has
// been closed. Because termbox is more or less unmaintained at this point,
// we should probably switch to some other library. Rather than try too hard
// to fix the bug, just work around it for now by ignoring the reported width
// and height when they are zero. We can fix the underlying bug if/when we
// switch to the new library.
go func() {
for {
events <- termbox.PollEvent()
}
}()
loop:
for {
render()
select {
case <-done:
break loop
case e := <-events:
switch e.Type {
case termbox.EventKey:
keyStack = append(keyStack, KeyEventFromTBEvent(&e))
if handleEvent(keyStack) {
keyStack = nil
}
case termbox.EventResize:
w, h := e.Width, e.Height
if w == 0 && h == 0 {
w, h = termbox.Size()
}
layout(w, h)
}
case <-time.After(time.Second / 10):
}
}
widgets.Destroy()
}
func AddChildPager(parent, child Pager, creatingKeys string) {
pagers.AddChild(parent, child, creatingKeys)
}
func PushPager(p Pager) {
pagers.Push(p)
}
func PopPager() {
pagers.Pop()
if pagers.Size() == 0 {
Quit()
}
}
func Confirm(message string, callback func()) {
prompt.Confirm(message, callback)
}
func ConfirmExec(cmd string, ctx Context, callback func()) {
Confirm(fmt.Sprintf("Run `%s`", cmd), func() {
Exec(cmd, ctx)
callback()
})
}
func Exec(cmd string, ctx Context) {
c := exec.Command(os.Getenv("SHELL"), "-c", cmd)
c.Env = ContextEnvironment(ctx)
c.Stdin = os.Stdin
c.Stdout = os.Stdout
c.Stderr = os.Stderr
closeTermbox()
defer initTermbox()
c.Run()
}
func RegisterMode(name string, mode Mode) {
modes[name] = mode
}
func layout(width, height int) {
widgets.SetBox(NewBox(0, 0, width, height-1))
prompt.SetBox(NewBox(0, height-1, width, 1))
}
func render() {
termbox.Clear(termbox.ColorDefault, termbox.ColorDefault)
widgets.Render()
prompt.Render()
termbox.Flush()
}
func AddEventHandler(keyStr string, handler func()) {
eventHandlers.Add(KeySequenceFromString(keyStr), NewEventHandler(handler))
}
func handleEvent(ks []keyEvent) bool {
if prompt.HandleEvent(ks) {
return true
}
if widgets.HandleEvent(ks) {
return true
}
if handler := eventHandlers.Find(ks); handler != nil {
handler.Call(nil)
return true
}
return false
}