117 lines
2.1 KiB
Go
117 lines
2.1 KiB
Go
package editor
|
|
|
|
import (
|
|
"fmt"
|
|
"strings"
|
|
"timshome.page/gilo/fn"
|
|
"timshome.page/gilo/terminal"
|
|
)
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// !Editor
|
|
// ----------------------------------------------------------------------------
|
|
|
|
type cursor struct {
|
|
x int
|
|
y int
|
|
}
|
|
|
|
type editor struct {
|
|
screen *terminal.Screen
|
|
cursor *cursor
|
|
}
|
|
|
|
func New() *editor {
|
|
screen := terminal.Size()
|
|
cursor := &cursor { 0, 0 }
|
|
|
|
return &editor{screen, cursor }
|
|
}
|
|
|
|
func (e *editor) RefreshScreen() {
|
|
ab := newBuffer()
|
|
|
|
ab.append(terminal.HideCursor)
|
|
ab.append(terminal.ResetCursor)
|
|
|
|
e.drawRows(ab)
|
|
ab.append(terminal.MoveCursor(e.cursor.x, e.cursor.y))
|
|
|
|
ab.append(terminal.ShowCursor)
|
|
|
|
terminal.Write(ab.toString())
|
|
}
|
|
|
|
func (e *editor) drawRows(ab *buffer) {
|
|
for y :=0; y < e.screen.Rows; y += 1 {
|
|
if y == e.screen.Rows / 3 {
|
|
welcome := fmt.Sprintf("Gilo editor -- version %s", KiloVersion)
|
|
if len(welcome) > e.screen.Cols {
|
|
welcome = fn.TruncateString(welcome, e.screen.Cols)
|
|
}
|
|
|
|
padding := (e.screen.Cols - len(welcome)) / 2
|
|
if padding > 0 {
|
|
ab.appendRune('~')
|
|
padding--
|
|
}
|
|
|
|
for padding > 0 {
|
|
padding--
|
|
ab.appendRune(' ')
|
|
}
|
|
|
|
ab.append(welcome)
|
|
} else {
|
|
ab.appendRune('~')
|
|
}
|
|
|
|
ab.append(terminal.ClearLine)
|
|
|
|
if y < (e.screen.Rows - 1) {
|
|
ab.append("\r\n")
|
|
}
|
|
}
|
|
}
|
|
|
|
func (e *editor) ProcessKeypress() bool {
|
|
str, _ := terminal.Read()
|
|
|
|
// Escape sequences can be less fun...
|
|
if strings.Contains(str, terminal.EscPrefix) {
|
|
code := strings.TrimPrefix(str, terminal.EscPrefix)
|
|
|
|
switch code {
|
|
case KeyArrowUp, KeyArrowDown, KeyArrowLeft, KeyArrowRight:
|
|
e.moveCursor(code)
|
|
default:
|
|
// Do something later
|
|
}
|
|
}
|
|
|
|
for _, ch := range str {
|
|
// Clean up on exit
|
|
if ch == fn.Ctrl('q') {
|
|
terminal.Write(terminal.ClearScreen + terminal.ResetCursor)
|
|
|
|
return false
|
|
}
|
|
}
|
|
|
|
return true
|
|
}
|
|
|
|
func (e *editor) moveCursor (rawKey string) {
|
|
key := keyMap[rawKey]
|
|
|
|
switch key {
|
|
case keyLeft:
|
|
e.cursor.x -= 1
|
|
case keyRight:
|
|
e.cursor.x += 1
|
|
case keyUp:
|
|
e.cursor.y -= 1
|
|
case keyDown:
|
|
e.cursor.y += 1
|
|
}
|
|
} |