gilo/internal/editor/editor.go
Timothy J. Warren c3b2900f42
All checks were successful
timw4mail/gilo/pipeline/head This commit looks good
Highlight numbers
2021-04-07 12:02:08 -04:00

228 lines
4.4 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/key"
"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) 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) save() {
if e.document.Filename == "" {
e.document.Filename = e.prompt("Save as: %s (ESC to cancel)", nil)
if e.document.Filename == "" {
e.SetStatusMessage("Save aborted")
}
}
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) prompt(prompt string, callback func(string, string)) string {
buf := gilo.NewBuffer()
// Show the prompt message
e.SetStatusMessage(prompt, "")
e.RefreshScreen()
for {
if buf.Len() > 0 {
e.SetStatusMessage(prompt, buf.ToString())
e.RefreshScreen()
}
ch, _ := terminal.ReadKey()
if ch == key.Enter {
if buf.Len() != 0 {
e.SetStatusMessage("")
if callback != nil {
callback(buf.ToString(), string(ch))
}
return buf.ToString()
}
} else if key.IsAscii(ch) && !key.IsCtrl(ch) {
buf.AppendRune(ch)
} else if ch == key.Backspace || ch == key.Ctrl('h') {
buf.Truncate(buf.Len() - 1)
} else if ch == key.Esc {
k := parseEscapeSequence()
if k == keyDelete {
buf.Truncate(buf.Len() - 1)
} else if k == string(key.Esc) {
e.SetStatusMessage("")
if callback != nil {
callback(buf.ToString(), k)
}
return ""
} else {
if callback != nil {
callback(buf.ToString(), k)
}
}
}
if callback != nil {
callback(buf.ToString(), string(ch))
}
}
}
func (e *editor) find() {
savedCursor := e.cursor.Clone()
savedOffset := e.cursor.Clone()
lastMatch := -1
direction := 1
query := e.prompt("Search: %s (Use ESC/Arrows/Enter)", func(query string, ch string) {
if ch == string(key.Enter) || ch == string(key.Esc) {
lastMatch = -1
direction = 1
return
} else if ch == keyRight || ch == keyDown {
direction = 1
} else if ch == keyLeft || ch == keyUp {
direction = -1
} else {
lastMatch = -1
direction = 1
}
if lastMatch == -1 {
direction = 1
}
current := lastMatch
for i := 0; i < e.document.RowCount(); i++ {
current += direction
if current == -1 {
current = e.document.RowCount()
} else if current == e.document.RowCount() {
current = 0
}
row := e.document.GetRow(current)
matchIndex := row.Search(query)
if matchIndex != -1 {
lastMatch = current
e.cursor.Y = current
e.cursor.X = row.RenderXtoCursorX(matchIndex)
e.offset.Y = e.document.RowCount()
break
}
}
})
if query == "" {
e.cursor = savedCursor.Clone()
e.offset = savedOffset.Clone()
return
}
}
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)
} else {
// Move cursor to the current end of the previous line
e.cursor.X = e.document.GetRow(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
}
}