gilo/editor/draw.go

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