gilo/internal/editor/editor.go
Timothy Warren 3c6568f8f7
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Merge lines if you press delete at beginning of a line
2021-04-02 16:14:19 -04:00

117 lines
2.1 KiB
Go

// The main interface/implementation of the editor object
package editor
import (
"fmt"
"time"
doc "timshome.page/gilo/internal/editor/document"
"timshome.page/gilo/internal/gilo"
"timshome.page/gilo/internal/terminal"
)
// ----------------------------------------------------------------------------
// !Editor
// ----------------------------------------------------------------------------
type statusMsg struct {
message string
created time.Time
}
type editor struct {
screen *terminal.Screen
cursor *gilo.Point
offset *gilo.Point
document *doc.Document
status *statusMsg
quitTimes uint8
renderX int
}
func NewEditor() *editor {
screen := terminal.Size()
// Subtract rows for status bar and message bar/prompt
screen.Rows -= 2
cursor := gilo.DefaultPoint()
offset := gilo.DefaultPoint()
document := doc.NewDocument()
status := &statusMsg{
"",
time.Now(),
}
return &editor{
screen,
cursor,
offset,
document,
status,
gilo.QuitTimes,
0,
}
}
func (e *editor) Open(filename string) {
e.document.Open(filename)
}
func (e *editor) Save() {
size := e.document.Save()
if size > 0 {
e.SetStatusMessage("%d bytes written to disk", size)
} else {
e.SetStatusMessage("Failed to save file")
}
}
func (e *editor) SetStatusMessage(template string, a ...interface{}) {
e.status = &statusMsg{
fmt.Sprintf(template, a...),
time.Now(),
}
}
func (e *editor) ProcessKeypress() bool {
ch, _ := terminal.ReadKey()
return e.processKeypressChar(ch)
}
func (e *editor) insertChar(ch rune) {
if e.cursor.Y == e.document.RowCount() {
e.document.AppendRow("")
}
e.document.InsertChar(e.cursor, ch)
e.cursor.X += 1
}
func (e *editor) delChar() {
if e.cursor.Y == e.document.RowCount() {
return
}
if e.cursor.X == 0 && e.cursor.Y == 0 {
return
}
if e.cursor.X > 0 {
at := e.cursor
at.X -= 1
e.document.DelChar(at)
e.cursor.X -= 1
} else {
// Move cursor to the current end of the previous line
e.cursor.X = e.document.Row(e.cursor.Y - 1).Size()
// Move the contents of the current row to the previous
e.document.MergeRows(e.cursor.Y - 1, e.cursor.Y)
e.cursor.Y -= 1
}
}