| // Copyright 2014 The gocui Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package main |
| |
| import ( |
| "fmt" |
| "io" |
| "io/ioutil" |
| "log" |
| |
| "github.com/jroimartin/gocui" |
| ) |
| |
| func nextView(g *gocui.Gui, v *gocui.View) error { |
| if v == nil || v.Name() == "side" { |
| return g.SetCurrentView("main") |
| } |
| return g.SetCurrentView("side") |
| } |
| |
| func cursorDown(g *gocui.Gui, v *gocui.View) error { |
| if v != nil { |
| cx, cy := v.Cursor() |
| if err := v.SetCursor(cx, cy+1); err != nil { |
| ox, oy := v.Origin() |
| if err := v.SetOrigin(ox, oy+1); err != nil { |
| return err |
| } |
| } |
| } |
| return nil |
| } |
| |
| func cursorUp(g *gocui.Gui, v *gocui.View) error { |
| if v != nil { |
| ox, oy := v.Origin() |
| cx, cy := v.Cursor() |
| if err := v.SetCursor(cx, cy-1); err != nil && oy > 0 { |
| if err := v.SetOrigin(ox, oy-1); err != nil { |
| return err |
| } |
| } |
| } |
| return nil |
| } |
| |
| func getLine(g *gocui.Gui, v *gocui.View) error { |
| var l string |
| var err error |
| |
| _, cy := v.Cursor() |
| if l, err = v.Line(cy); err != nil { |
| l = "" |
| } |
| |
| maxX, maxY := g.Size() |
| if v, err := g.SetView("msg", maxX/2-30, maxY/2, maxX/2+30, maxY/2+2); err != nil { |
| if err != gocui.ErrorUnkView { |
| return err |
| } |
| fmt.Fprintln(v, l) |
| if err := g.SetCurrentView("msg"); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| func delMsg(g *gocui.Gui, v *gocui.View) error { |
| if err := g.DeleteView("msg"); err != nil { |
| return err |
| } |
| if err := g.SetCurrentView("side"); err != nil { |
| return err |
| } |
| return nil |
| } |
| |
| func quit(g *gocui.Gui, v *gocui.View) error { |
| return gocui.Quit |
| } |
| |
| func keybindings(g *gocui.Gui) error { |
| if err := g.SetKeybinding("side", gocui.KeyCtrlSpace, gocui.ModNone, nextView); err != nil { |
| return err |
| } |
| if err := g.SetKeybinding("main", gocui.KeyCtrlSpace, gocui.ModNone, nextView); err != nil { |
| return err |
| } |
| if err := g.SetKeybinding("side", gocui.KeyArrowDown, gocui.ModNone, cursorDown); err != nil { |
| return err |
| } |
| if err := g.SetKeybinding("side", gocui.KeyArrowUp, gocui.ModNone, cursorUp); err != nil { |
| return err |
| } |
| if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil { |
| return err |
| } |
| if err := g.SetKeybinding("side", gocui.KeyEnter, gocui.ModNone, getLine); err != nil { |
| return err |
| } |
| if err := g.SetKeybinding("msg", gocui.KeyEnter, gocui.ModNone, delMsg); err != nil { |
| return err |
| } |
| |
| if err := g.SetKeybinding("main", gocui.KeyCtrlS, gocui.ModNone, saveMain); err != nil { |
| return err |
| } |
| return nil |
| } |
| |
| func saveMain(g *gocui.Gui, v *gocui.View) error { |
| f, err := ioutil.TempFile("", "gocui_demo_") |
| if err != nil { |
| return err |
| } |
| defer f.Close() |
| |
| p := make([]byte, 5) |
| v.Rewind() |
| for { |
| n, err := v.Read(p) |
| if n > 0 { |
| if _, err := f.Write(p[:n]); err != nil { |
| return err |
| } |
| } |
| if err == io.EOF { |
| break |
| } |
| if err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| func layout(g *gocui.Gui) error { |
| maxX, maxY := g.Size() |
| if v, err := g.SetView("side", -1, -1, 30, maxY); err != nil { |
| if err != gocui.ErrorUnkView { |
| return err |
| } |
| v.Highlight = true |
| fmt.Fprintln(v, "Item 1") |
| fmt.Fprintln(v, "Item 2") |
| fmt.Fprintln(v, "Item 3") |
| fmt.Fprint(v, "\rWill be") |
| fmt.Fprint(v, "deleted\rItem 4\nItem 5") |
| } |
| if v, err := g.SetView("main", 30, -1, maxX, maxY); err != nil { |
| if err != gocui.ErrorUnkView { |
| return err |
| } |
| b, err := ioutil.ReadFile("Mark.Twain-Tom.Sawyer.txt") |
| if err != nil { |
| panic(err) |
| } |
| fmt.Fprintf(v, "%s", b) |
| v.Editable = true |
| v.Wrap = true |
| if err := g.SetCurrentView("main"); err != nil { |
| return err |
| } |
| } |
| return nil |
| } |
| |
| func main() { |
| var err error |
| |
| g := gocui.NewGui() |
| if err := g.Init(); err != nil { |
| log.Panicln(err) |
| } |
| defer g.Close() |
| |
| g.SetLayout(layout) |
| if err := keybindings(g); err != nil { |
| log.Panicln(err) |
| } |
| g.SelBgColor = gocui.ColorGreen |
| g.SelFgColor = gocui.ColorBlack |
| g.ShowCursor = true |
| |
| err = g.MainLoop() |
| if err != nil && err != gocui.Quit { |
| log.Panicln(err) |
| } |
| } |