gilo/editor/editor.go

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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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// ----------------------------------------------------------------------------
// !Editor
// ----------------------------------------------------------------------------
type cursor struct {
x int
y int
}
type editor struct {
screen *terminal.Screen
cursor *cursor
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}
func New() *editor {
screen := terminal.Size()
cursor := &cursor { 0, 0 }
return &editor{screen, cursor }
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}
func (e *editor) RefreshScreen() {
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ab := newBuffer()
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ab.append(terminal.HideCursor)
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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}
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') {
terminal.Write(terminal.ClearScreen + terminal.ResetCursor)
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return false
}
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switch ch {
case 'w', 'a', 's', 'd':
e.moveCursor(ch)
default:
// Do nothing!
}
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return true
}
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func (e *editor) drawRows(ab *buffer) {
for y :=0; y < e.screen.Rows; y += 1 {
if y == e.screen.Rows / 3 {
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welcome := fmt.Sprintf("Gilo editor -- version %s", KiloVersion)
if len(welcome) > e.screen.Cols {
welcome = fn.TruncateString(welcome, e.screen.Cols)
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}
padding := (e.screen.Cols - len(welcome)) / 2
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if padding > 0 {
ab.appendRune('~')
padding--
}
for padding > 0 {
padding--
ab.appendRune(' ')
}
ab.append(welcome)
} else {
ab.appendRune('~')
}
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ab.append(terminal.ClearLine)
if y < (e.screen.Rows - 1) {
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ab.append("\r\n")
}
}
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}
func (e *editor) moveCursor (key rune) {
switch key {
case 'a':
e.cursor.x -= 1
case 'd':
e.cursor.x += 1
case 'w':
e.cursor.y -= 1
case 's':
e.cursor.y += 1
}
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}