109 lines
1.8 KiB
Go
109 lines
1.8 KiB
Go
package editor
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import (
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"fmt"
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"timshome.page/gilo/fn"
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"timshome.page/gilo/terminal"
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)
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const KiloVersion = "0.0.1"
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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) RefreshScreen() {
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ab := newBuffer()
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ab.append(terminal.HideCursor)
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ab.append(terminal.ResetCursor)
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e.drawRows(ab)
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ab.append(terminal.MoveCursor(e.cursor.x, e.cursor.y))
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ab.append(terminal.ShowCursor)
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terminal.Write(ab.toString())
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}
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func (e *editor) ProcessKeypress() bool {
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ch, _ := terminal.ReadKey()
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// Clean up on exit
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if ch == fn.Ctrl('q') {
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terminal.Write(terminal.ClearScreen + terminal.ResetCursor)
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return false
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}
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switch ch {
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case 'w', 'a', 's', 'd':
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e.moveCursor(ch)
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default:
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// Do nothing!
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}
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return true
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}
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func (e *editor) drawRows(ab *buffer) {
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for y :=0; y < e.screen.Rows; y += 1 {
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if y == e.screen.Rows / 3 {
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welcome := fmt.Sprintf("Gilo editor -- version %s", KiloVersion)
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if len(welcome) > e.screen.Cols {
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welcome = fn.TruncateString(welcome, e.screen.Cols)
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}
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padding := (e.screen.Cols - len(welcome)) / 2
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if padding > 0 {
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ab.appendRune('~')
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padding--
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}
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for padding > 0 {
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padding--
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ab.appendRune(' ')
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}
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ab.append(welcome)
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} else {
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ab.appendRune('~')
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}
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ab.append(terminal.ClearLine)
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if y < (e.screen.Rows - 1) {
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ab.append("\r\n")
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}
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}
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}
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func (e *editor) moveCursor (key rune) {
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switch key {
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case 'a':
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e.cursor.x -= 1
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case 'd':
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e.cursor.x += 1
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case 'w':
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e.cursor.y -= 1
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case 's':
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e.cursor.y += 1
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}
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} |