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nanonanomachine/happypath.go

Last active April 25, 2021 09:22
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a case for gocui which does not work setCurrentView on key press
Raw
happypath.go
// 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"
"strings"
"github.com/jroimartin/gocui"
)
func nextView(g *gocui.Gui, v *gocui.View) error {
if v == nil || v.Name() == "side" {
_, err := g.SetCurrentView("main")
return err
}
_, err := g.SetCurrentView("side")
return err
}
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.ErrUnknownView {
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.ErrQuit
}
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
}
if err := g.SetKeybinding("main", gocui.KeyCtrlW, gocui.ModNone, saveVisualMain); 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 saveVisualMain(g *gocui.Gui, v *gocui.View) error {
f, err := ioutil.TempFile("", "gocui_demo_")
if err != nil {
return err
}
defer f.Close()
vb := v.ViewBuffer()
if _, err := io.Copy(f, strings.NewReader(vb)); 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.ErrUnknownView {
return err
}
v.Highlight = true
v.SelBgColor = gocui.ColorGreen
v.SelFgColor = gocui.ColorBlack
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.ErrUnknownView {
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() {
g, err := gocui.NewGui(gocui.OutputNormal)
if err != nil {
log.Panicln(err)
}
defer g.Close()
g.Cursor = true
g.SetManagerFunc(layout)
if err := keybindings(g); err != nil {
log.Panicln(err)
}
if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
log.Panicln(err)
}
}
Raw
sadpath.go
// 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"
"strings"
"github.com/jroimartin/gocui"
)
func nextView(g *gocui.Gui, v *gocui.View) error {
if v == nil || v.Name() == "side" {
_, err := g.SetCurrentView("main")
return err
}
_, err := g.SetCurrentView("side")
return err
}
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.ErrUnknownView {
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.ErrQuit
}
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
}
if err := g.SetKeybinding("main", gocui.KeyCtrlW, gocui.ModNone, saveVisualMain); 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 saveVisualMain(g *gocui.Gui, v *gocui.View) error {
f, err := ioutil.TempFile("", "gocui_demo_")
if err != nil {
return err
}
defer f.Close()
vb := v.ViewBuffer()
if _, err := io.Copy(f, strings.NewReader(vb)); 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.ErrUnknownView {
return err
}
v.Highlight = true
v.SelBgColor = gocui.ColorGreen
v.SelFgColor = gocui.ColorBlack
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.ErrUnknownView {
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
}
// This line is changed
if _, err := g.SetCurrentView("main"); err != nil {
return err
}
return nil
}
func main() {
g, err := gocui.NewGui(gocui.OutputNormal)
if err != nil {
log.Panicln(err)
}
defer g.Close()
g.Cursor = true
g.SetManagerFunc(layout)
if err := keybindings(g); err != nil {
log.Panicln(err)
}
if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
log.Panicln(err)
}
}
@nanonanomachine
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Author

nanonanomachine commented Apr 25, 2021 •
edited
Loading

If we put the following block in layout function outside of the setView block, it will not work

difference :

happypath:

if v, err := g.SetView("main", 30, -1, maxX, maxY); err != nil {
		if err != gocui.ErrUnknownView {
			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
		}
	}

sadpath

if v, err := g.SetView("main", 30, -1, maxX, maxY); err != nil {
	if err != gocui.ErrUnknownView {
		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
}
// This line is changed
if _, err := g.SetCurrentView("main"); err != nil {
	return err
}

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