gilo/editor/editor.go

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package editor
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import (
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"fmt"
"time"
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"timshome.page/gilo/key"
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"timshome.page/gilo/terminal"
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)
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// ----------------------------------------------------------------------------
// !Editor
// ----------------------------------------------------------------------------
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type point struct {
x int
y int
}
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type statusMsg struct {
message string
created time.Time
}
type editor struct {
screen *terminal.Screen
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cursor *point
offset *point
document *document
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status *statusMsg
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renderX int
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}
func New() *editor {
screen := terminal.Size()
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// Subtract rows for status bar and message bar/prompt
screen.Rows -= 2
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cursor := &point{0, 0}
offset := &point{0, 0}
document := newDocument()
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status := &statusMsg{
"",
time.Now(),
}
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return &editor{
screen,
cursor,
offset,
document,
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status,
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0,
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}
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}
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func (e *editor) Open(filename string) {
e.document.open(filename)
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}
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func (e *editor) SetStatusMessage(template string, a ...interface{}) {
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e.status = &statusMsg{
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fmt.Sprintf(template, a...),
time.Now(),
}
}
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func (e *editor) ProcessKeypress() bool {
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ch, _ := terminal.ReadKey()
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switch ch {
case key.Ctrl('q'):
// Clean up on exit
terminal.Write(terminal.ClearScreen + terminal.ResetCursor)
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return false
case key.Esc:
// Modifier keys that return ANSI escape sequences
str := parseEscapeSequence()
switch str {
case keyUp,
keyDown,
keyLeft,
keyRight,
keyPageUp,
keyPageDown,
keyHome,
keyEnd:
e.moveCursor(str)
}
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default:
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e.insertChar(ch)
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}
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return true
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}
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func (e *editor) moveCursor(key string) {
var row *row
if e.cursor.y >= e.document.rowCount() {
row = nil
} else {
row = e.document.rows[e.cursor.y]
}
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switch key {
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case keyLeft:
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if e.cursor.x != 0 {
e.cursor.x -= 1
}
// Move from beginning of current row to end of previous row
if e.cursor.y > 0 {
e.cursor.y -= 1
e.cursor.x = e.document.rows[e.cursor.y].size()
}
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case keyRight:
if row != nil && e.cursor.x < row.size() {
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e.cursor.x += 1
}
// Move from end of current line to beginning of next line
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if row != nil && e.cursor.x == row.size() && e.cursor.y < e.document.rowCount()-1 {
e.cursor.y += 1
e.cursor.x = 0
}
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case keyUp:
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if e.cursor.y != 0 {
e.cursor.y -= 1
}
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case keyDown:
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if e.cursor.y < e.document.rowCount() {
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e.cursor.y += 1
}
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case keyPageUp:
if e.cursor.y > e.screen.Rows {
e.cursor.y -= e.screen.Rows
} else {
e.cursor.y = 0
}
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case keyPageDown:
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if e.cursor.y+e.screen.Rows > e.document.rowCount() {
e.cursor.y += e.screen.Rows
} else {
e.cursor.y = e.document.rowCount() - 1
}
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case keyHome:
e.cursor.x = 0
case keyEnd:
if row != nil {
e.cursor.x = row.size()
}
}
if e.cursor.y < e.document.rowCount() {
row = e.document.rows[e.cursor.y]
rowLen := row.size()
// Snap to the end of a shorter line from a longer one
if e.cursor.x > rowLen {
e.cursor.x = rowLen
}
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}
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}
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func (e *editor) insertChar(ch rune) {
if e.cursor.y == e.document.rowCount() {
e.document.appendRow("")
}
e.document.rows[e.cursor.y].insertRune(ch, e.cursor.x)
e.cursor.x += 1
}
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// Convert the raw ANSI escape sequences to the type of key input
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func parseEscapeSequence() string {
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var runes []rune
for i := 0; i < 3; i++ {
ch, size := terminal.ReadKey()
if size == 0 {
return "\x1b"
}
runes = append(runes, ch)
if i == 1 && runes[1] >= 'A' {
// \eOH \eOF
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if runes[0] == 'O' {
switch runes[1] {
case 'H':
return keyHome
case 'F':
return keyEnd
}
}
// \e[A
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if runes[0] == '[' {
switch runes[1] {
case 'A':
return keyUp
case 'B':
return keyDown
case 'C':
return keyRight
case 'D':
return keyLeft
case 'H':
return keyHome
case 'F':
return keyEnd
}
}
}
// \e[1~
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if i == 2 && runes[0] == '[' && runes[2] == '~' {
switch runes[1] {
case '1':
return keyHome
case '3':
return keyDelete
case '4':
return keyEnd
case '5':
return keyPageUp
case '6':
return keyPageDown
case '7':
return keyHome
case '8':
return keyEnd
}
}
}
return string('\x1b')
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}