gilo/editor/draw.go
Timothy J. Warren 6e5e287bb3
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Show filename and row count in status bar
2021-04-01 12:37:28 -04:00

137 lines
2.8 KiB
Go

// Editor methods involved in drawing to the console
package editor
import (
"fmt"
"strings"
"timshome.page/gilo/terminal"
)
// ----------------------------------------------------------------------------
// !Editor Methods
// ----------------------------------------------------------------------------
func (e *editor) RefreshScreen() {
e.scroll()
ab := newBuffer()
ab.append(terminal.HideCursor)
ab.append(terminal.ResetCursor)
e.drawRows(ab)
e.drawStatusBar(ab)
ab.append(terminal.MoveCursor(e.renderX - e.offset.x, e.cursor.y - e.offset.y))
ab.append(terminal.ShowCursor)
terminal.Write(ab.toString())
}
func (e *editor) scroll() {
e.renderX = 0
if e.cursor.y < e.document.rowCount() {
e.renderX = e.document.rows[e.cursor.y].cursorXToRenderX(e.cursor.x)
}
if e.cursor.y < e.offset.y {
e.offset.y = e.cursor.y
}
if e.cursor.y >= e.offset.y + e.screen.Rows {
e.offset.y = e.cursor.y - e.screen.Rows + 1
}
if e.renderX < e.offset.x {
e.offset.x = e.renderX
}
if e.renderX >= e.offset.x + e.screen.Cols {
e.offset.x = e.renderX - e.screen.Cols
}
}
func (e *editor) drawRows(ab *buffer) {
for y :=0; y < e.screen.Rows; y++ {
fileRow := y + e.offset.y
if fileRow >= e.document.rowCount() {
e.drawPlaceholderRow(y, ab)
} 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
outputRow := truncateString(string(e.document.rows[fileRow].render[e.offset.x:]), rowLen)
ab.append(outputRow)
}
ab.append(terminal.ClearLine)
ab.append("\r\n")
}
}
func (e *editor) drawPlaceholderRow(y int, ab *buffer) {
if e.document.rowCount() == 0 && y == e.screen.Rows / 3 {
welcome := fmt.Sprintf("Gilo editor -- version %s", KiloVersion)
if len(welcome) > e.screen.Cols {
welcome = truncateString(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('~')
}
}
func (e *editor) drawStatusBar(ab *buffer) {
cols := e.screen.Cols
ab.append(terminal.InvertColor)
fileName := "[No Name]"
if e.document.filename != "" {
fileName = e.document.filename
}
statusLine := fmt.Sprintf("%.20s - %d lines", fileName, e.document.rowCount())
length := len(statusLine)
if length > cols{
statusLine = truncateString(statusLine, cols)
ab.append(statusLine)
ab.append(terminal.ResetColor)
return
}
ab.append(statusLine)
// Pad the rest of the status line
padding := strings.Repeat(" ", cols - length)
ab.append(padding)
ab.append(terminal.ResetColor)
}