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// Copyright 2017 Zack Guo <zack.y.guo@gmail.com>. All rights reserved.
// Use of this source code is governed by a MIT license that can
// be found in the LICENSE file.
package termui
import (
"image"
"io"
"sync"
"time"
"fmt"
"os"
"runtime/debug"
"bytes"
"github.com/maruel/panicparse/stack"
tm "github.com/nsf/termbox-go"
)
// Bufferer should be implemented by all renderable components.
type Bufferer interface {
Buffer() Buffer
}
// Init initializes termui library. This function should be called before any others.
// After initialization, the library must be finalized by 'Close' function.
func Init() error {
if err := tm.Init(); err != nil {
return err
}
sysEvtChs = make([]chan Event, 0)
go hookTermboxEvt()
renderJobs = make(chan []Bufferer)
//renderLock = new(sync.RWMutex)
Body = NewGrid()
Body.X = 0
Body.Y = 0
Body.BgColor = ThemeAttr("bg")
Body.Width = TermWidth()
DefaultEvtStream.Init()
DefaultEvtStream.Merge("termbox", NewSysEvtCh())
DefaultEvtStream.Merge("timer", NewTimerCh(time.Second))
DefaultEvtStream.Merge("custom", usrEvtCh)
DefaultEvtStream.Handle("/", DefaultHandler)
DefaultEvtStream.Handle("/sys/wnd/resize", func(e Event) {
w := e.Data.(EvtWnd)
Body.Width = w.Width
})
DefaultWgtMgr = NewWgtMgr()
DefaultEvtStream.Hook(DefaultWgtMgr.WgtHandlersHook())
go func() {
for bs := range renderJobs {
render(bs...)
}
}()
return nil
}
// Close finalizes termui library,
// should be called after successful initialization when termui's functionality isn't required anymore.
func Close() {
tm.Close()
}
var renderLock sync.Mutex
func termSync() {
renderLock.Lock()
tm.Sync()
termWidth, termHeight = tm.Size()
renderLock.Unlock()
}
// TermWidth returns the current terminal's width.
func TermWidth() int {
termSync()
return termWidth
}
// TermHeight returns the current terminal's height.
func TermHeight() int {
termSync()
return termHeight
}
// Render renders all Bufferer in the given order from left to right,
// right could overlap on left ones.
func render(bs ...Bufferer) {
defer func() {
if e := recover(); e != nil {
Close()
fmt.Fprintf(os.Stderr, "Captured a panic(value=%v) when rendering Bufferer. Exit termui and clean terminal...\nPrint stack trace:\n\n", e)
//debug.PrintStack()
gs, err := stack.ParseDump(bytes.NewReader(debug.Stack()), os.Stderr)
if err != nil {
debug.PrintStack()
os.Exit(1)
}
p := &stack.Palette{}
buckets := stack.SortBuckets(stack.Bucketize(gs, stack.AnyValue))
srcLen, pkgLen := stack.CalcLengths(buckets, false)
for _, bucket := range buckets {
io.WriteString(os.Stdout, p.BucketHeader(&bucket, false, len(buckets) > 1))
io.WriteString(os.Stdout, p.StackLines(&bucket.Signature, srcLen, pkgLen, false))
}
os.Exit(1)
}
}()
for _, b := range bs {
buf := b.Buffer()
// set cels in buf
for p, c := range buf.CellMap {
if p.In(buf.Area) {
tm.SetCell(p.X, p.Y, c.Ch, toTmAttr(c.Fg), toTmAttr(c.Bg))
}
}
}
renderLock.Lock()
// render
tm.Flush()
renderLock.Unlock()
}
func Clear() {
tm.Clear(tm.ColorDefault, toTmAttr(ThemeAttr("bg")))
}
func clearArea(r image.Rectangle, bg Attribute) {
for i := r.Min.X; i < r.Max.X; i++ {
for j := r.Min.Y; j < r.Max.Y; j++ {
tm.SetCell(i, j, ' ', tm.ColorDefault, toTmAttr(bg))
}
}
}
func ClearArea(r image.Rectangle, bg Attribute) {
clearArea(r, bg)
tm.Flush()
}
var renderJobs chan []Bufferer
func Render(bs ...Bufferer) {
//go func() { renderJobs <- bs }()
renderJobs <- bs
}
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