gilo/editor/Editor.go

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// Package editor The main interface/implementation of the editor object
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package editor
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import (
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"fmt"
"time"
"timshome.page/gilo/char"
"timshome.page/gilo/editor/document"
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"timshome.page/gilo/internal/gilo"
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"timshome.page/gilo/terminal"
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)
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// ----------------------------------------------------------------------------
// !Editor
// ----------------------------------------------------------------------------
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type statusMsg struct {
message string
created time.Time
}
type Editor struct {
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screen *terminal.Screen
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cursor *gilo.Point
offset *gilo.Point
doc *document.Document
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status *statusMsg
search *search
quitTimes uint8
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renderX int
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}
func NewEditor() *Editor {
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// Subtract rows for status bar and message bar/prompt
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screen := terminal.Size()
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screen.Rows -= 2
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status := &statusMsg{
"",
time.Now(),
}
return &Editor{
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screen,
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gilo.DefaultPoint(),
gilo.DefaultPoint(),
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document.NewDocument(),
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status,
newSearch(),
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gilo.QuitTimes,
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0,
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}
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}
func (e *Editor) Open(filename string) {
e.doc.Open(filename)
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}
func (e *Editor) SetStatusMessage(template string, a ...interface{}) {
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e.status = &statusMsg{
fmt.Sprintf(template, a...),
time.Now(),
}
}
func (e *Editor) ProcessKeypress() bool {
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ch, _ := terminal.ReadKey()
return e.processKeypressChar(ch)
}
func (e *Editor) save() {
if e.doc.Filename == "" {
e.doc.Filename = e.prompt("Save as: %s (ESC to cancel)", nil)
if e.doc.Filename == "" {
e.SetStatusMessage("Save aborted")
return
}
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}
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// Set the syntax highlighting type, now that we now the file extension
e.doc.SelectSyntaxHighlight()
size := e.doc.Save()
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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 {
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buf := gilo.NewBuffer()
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// Show the prompt message
e.SetStatusMessage(prompt, "")
e.RefreshScreen()
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for {
if buf.Len() > 0 {
e.SetStatusMessage(prompt, buf.ToString())
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e.RefreshScreen()
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}
ch, _ := terminal.ReadKey()
if ch == char.Enter {
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if buf.Len() != 0 {
e.SetStatusMessage("")
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if callback != nil {
callback(buf.ToString(), string(ch))
}
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return buf.ToString()
}
} else if char.IsAscii(ch) && !char.IsCtrl(ch) {
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buf.AppendRune(ch)
} else if ch == char.Backspace || ch == char.Ctrl('h') {
buf.Truncate(buf.Len() - 1)
} else if ch == char.Esc {
k := parseEscapeSequence()
if k == keyDelete {
buf.Truncate(buf.Len() - 1)
} else if k == string(char.Esc) {
e.SetStatusMessage("")
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if callback != nil {
callback(buf.ToString(), k)
}
return ""
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} else {
if callback != nil {
callback(buf.ToString(), k)
}
}
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}
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if callback != nil {
callback(buf.ToString(), string(ch))
}
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}
}
func (e *Editor) insertChar(ch rune) {
if e.cursor.Y == e.doc.RowCount() {
e.doc.AppendRow("")
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}
e.doc.InsertChar(e.cursor, ch)
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e.cursor.X += 1
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}
func (e *Editor) delChar() {
if e.cursor.Y == e.doc.RowCount() {
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return
}
if e.cursor.X == 0 && e.cursor.Y == 0 {
return
}
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if e.cursor.X > 0 {
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at := e.cursor
at.X -= 1
e.doc.DelChar(at)
} else {
// Move cursor to the current end of the previous line
e.cursor.X = e.doc.GetRow(e.cursor.Y - 1).Size()
// Move the contents of the current row to the previous
e.doc.MergeRows(e.cursor.Y-1, e.cursor.Y)
e.cursor.Y -= 1
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}
}