164 lines
3.4 KiB
Go
164 lines
3.4 KiB
Go
// Editor methods involved in drawing to the console
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package editor
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import (
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"fmt"
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"strings"
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"time"
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"timshome.page/gilo/terminal"
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)
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// ----------------------------------------------------------------------------
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// !Editor Methods
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// ----------------------------------------------------------------------------
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func (e *editor) RefreshScreen() {
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e.scroll()
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ab := newBuffer()
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ab.append(terminal.HideCursor)
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ab.append(terminal.ResetCursor)
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e.drawRows(ab)
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e.drawStatusBar(ab)
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e.drawMessageBar(ab)
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ab.append(terminal.MoveCursor(e.renderX-e.offset.x, e.cursor.y-e.offset.y))
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ab.append(terminal.ShowCursor)
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terminal.Write(ab.toString())
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}
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func (e *editor) scroll() {
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e.renderX = 0
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if e.cursor.y < e.document.rowCount() {
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e.renderX = e.document.rows[e.cursor.y].cursorXToRenderX(e.cursor.x)
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}
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if e.cursor.y < e.offset.y {
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e.offset.y = e.cursor.y
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}
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if e.cursor.y >= e.offset.y+e.screen.Rows {
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e.offset.y = e.cursor.y - e.screen.Rows + 1
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}
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if e.renderX < e.offset.x {
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e.offset.x = e.renderX
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}
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if e.renderX >= e.offset.x+e.screen.Cols {
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e.offset.x = e.renderX - e.screen.Cols
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}
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}
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func (e *editor) drawRows(ab *buffer) {
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for y := 0; y < e.screen.Rows; y++ {
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fileRow := y + e.offset.y
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if fileRow >= e.document.rowCount() {
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e.drawPlaceholderRow(y, ab)
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} else {
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rawRow := e.document.rows[fileRow]
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// If the column offset is greater than the length of the row,
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// just display an empty row
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if e.offset.x > rawRow.size() {
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ab.append("")
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continue
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}
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rowLen := e.document.rows[fileRow].rSize() - e.offset.x
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outputRow := truncate(string(e.document.rows[fileRow].render[e.offset.x:]), rowLen)
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ab.append(outputRow)
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}
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ab.appendLn(terminal.ClearLine)
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}
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}
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func (e *editor) drawPlaceholderRow(y int, ab *buffer) {
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if e.document.rowCount() == 0 && y == e.screen.Rows/3 {
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welcome := fmt.Sprintf("Gilo editor -- version %s", KiloVersion)
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if len(welcome) > e.screen.Cols {
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welcome = truncate(welcome, e.screen.Cols)
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}
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padding := (e.screen.Cols - len(welcome)) / 2
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if padding > 0 {
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ab.appendRune('~')
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padding--
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}
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for padding > 0 {
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padding--
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ab.appendRune(' ')
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}
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ab.append(welcome)
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} else {
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ab.appendRune('~')
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}
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}
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func (e *editor) drawStatusBar(ab *buffer) {
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cols := e.screen.Cols
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ab.append(terminal.InvertColor)
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fileName := "[No Name]"
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if e.document.filename != "" {
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fileName = e.document.filename
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}
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leftStatus := fmt.Sprintf("%.20s - %d lines", fileName, e.document.rowCount())
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length := len(leftStatus)
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if length > cols {
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leftStatus = truncate(leftStatus, cols)
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ab.append(leftStatus)
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ab.append(terminal.ResetColor)
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return
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}
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rightStatus := fmt.Sprintf("%d/%d", e.cursor.y, e.document.rowCount())
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rlength := len(rightStatus)
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statusLength := length + rlength
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if statusLength <= cols {
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paddingLength := cols - statusLength
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padding := strings.Repeat(" ", paddingLength)
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ab.append(leftStatus)
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ab.append(padding)
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ab.append(rightStatus)
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ab.append(terminal.ResetColor)
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return
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}
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ab.append(leftStatus)
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// Pad the rest of the status line
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padding := strings.Repeat(" ", cols-length)
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ab.append(padding)
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ab.append(terminal.ResetColor)
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}
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func (e *editor) drawMessageBar(ab *buffer) {
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ab.append("\r\n")
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ab.append(terminal.ClearLine)
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msg := truncate(e.status.message, e.screen.Cols)
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if len(msg) > 0 && time.Since(e.status.created).Seconds() < 5.0 {
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ab.append(msg)
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}
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}
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