100 lines
1.8 KiB
Go
100 lines
1.8 KiB
Go
package editor
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import (
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"strings"
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"timshome.page/gilo/fn"
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"timshome.page/gilo/terminal"
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)
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// ----------------------------------------------------------------------------
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// !Editor
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// ----------------------------------------------------------------------------
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type cursor struct {
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x int
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y int
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}
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type editor struct {
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screen *terminal.Screen
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cursor *cursor
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}
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func New() *editor {
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screen := terminal.Size()
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cursor := &cursor { 0, 0 }
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return &editor{screen, cursor }
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}
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func (e *editor) ProcessKeypress() bool {
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var runes []rune
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// for ch, size := terminal.ReadKey(); size != 0; ch, size = terminal.ReadKey() {
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for i := 0; i < 4; i++ {
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ch, size := terminal.ReadKey()
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if size == 0 {
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break
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}
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if ch == fn.Ctrl('q') {
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// Clean up on exit
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terminal.Write(terminal.ClearScreen + terminal.ResetCursor)
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return false
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}
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runes = append(runes, ch)
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// Break early for arrow keys
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if i == 2 && ch >= 'A' && ch <= 'D' {
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break
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}
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}
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// terminal.Write("%v", runes)
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str := string(runes)
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runes = runes[:0]
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// Escape sequences can be less fun...
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if strings.Contains(str, terminal.EscPrefix) {
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code := strings.TrimPrefix(str, terminal.EscPrefix)
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switch code {
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case KeyArrowUp, KeyArrowDown, KeyArrowLeft, KeyArrowRight, KeyPageUp, KeyPageDown:
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e.moveCursor(code)
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runes = runes[:0]
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return true
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default:
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// Do something later
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terminal.Write("Code: %v", str)
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}
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}
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return true
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}
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func (e *editor) moveCursor (key string) {
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switch key {
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case KeyArrowLeft:
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if e.cursor.x != 0 {
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e.cursor.x -= 1
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}
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case KeyArrowRight:
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if e.cursor.x != e.screen.Cols-1 {
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e.cursor.x += 1
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}
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case KeyArrowUp:
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if e.cursor.y != 0 {
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e.cursor.y -= 1
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}
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case KeyArrowDown:
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if e.cursor.y != e.screen.Rows-1 {
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e.cursor.y += 1
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}
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case KeyPageUp:
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e.cursor.y = 0
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case KeyPageDown:
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e.cursor.y = e.screen.Rows
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}
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} |