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Render tab characters as 4 spaces

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EnumDev 2025-06-11 16:44:52 +03:00
parent 4ca6d9b75b
commit 5d64673519
1 changed files with 81 additions and 42 deletions
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123
src/window.go
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@ -4,6 +4,7 @@ import (
"github.com/gdamore/tcell/v2"
"log"
"slices"
"strings"
)
type CursorMode uint8
@ -77,49 +78,52 @@ func (window *Window) drawCurrentBuffer() {
bufferX, bufferY, _, _ := window.GetTextAreaDimensions()
normalStyle := tcell.StyleDefault.Foreground(tcell.ColorWhite).Background(tcell.Color234)
selectedStyle := tcell.StyleDefault.Foreground(tcell.ColorWhite).Background(tcell.Color243)
for i, r := range buffer.Contents + " " {
if x-buffer.OffsetX >= bufferX && y-buffer.OffsetY >= bufferY {
// Default style
style := tcell.StyleDefault.Foreground(tcell.ColorWhite).Background(tcell.Color234)
for i, r := range buffer.Contents {
if r == '\n' {
x = 0
if window.ShowLineIndex {
x += bufferX
// Change background if under cursor
if i == buffer.CursorPos {
style = style.Background(tcell.Color243)
}
y++
// Change background if selected
if buffer.Selection != nil {
if buffer.Selection.selectionEnd >= buffer.Selection.selectionStart && i >= buffer.Selection.selectionStart && i <= buffer.Selection.selectionEnd {
style = style.Background(tcell.Color243)
// Show selection on entire tab space
if r == '\t' {
for j := 0; j < 4; j++ {
window.screen.SetContent(x+j-buffer.OffsetX, y-buffer.OffsetY, r, nil, style)
}
}
} else if i <= buffer.Selection.selectionStart && i >= buffer.Selection.selectionEnd {
style = style.Background(tcell.Color243)
// Show selection on entire tab space
if r == '\t' {
for j := 0; j < 4; j++ {
window.screen.SetContent(x+j-buffer.OffsetX, y-buffer.OffsetY, r, nil, style)
}
}
}
}
window.screen.SetContent(x-buffer.OffsetX, y-buffer.OffsetY, r, nil, style)
}
if r != '\n' {
// Change position for next character
if r == '\n' {
x = bufferX
y++
} else if r == '\t' {
x += 4
} else {
x++
}
if x-buffer.OffsetX-1 < bufferX {
continue
}
if y-buffer.OffsetY < bufferY {
continue
}
if buffer.Selection != nil && buffer.Selection.selectionEnd >= buffer.Selection.selectionStart && i >= buffer.Selection.selectionStart && i <= buffer.Selection.selectionEnd {
window.screen.SetContent(x-buffer.OffsetX-1, y-buffer.OffsetY, r, nil, selectedStyle)
} else if buffer.Selection != nil && i <= buffer.Selection.selectionStart && i >= buffer.Selection.selectionEnd {
window.screen.SetContent(x-buffer.OffsetX-1, y-buffer.OffsetY, r, nil, selectedStyle)
} else {
window.screen.SetContent(x-buffer.OffsetX-1, y-buffer.OffsetY, r, nil, normalStyle)
}
}
// Draw cursor
cursorX, cursorY := window.GetCursorPos2D()
cursorX += bufferX
cursorY += bufferY
cursorX -= window.CurrentBuffer.OffsetX
cursorY -= window.CurrentBuffer.OffsetY
r, _, _, _ := window.screen.GetContent(cursorX, cursorY)
window.screen.SetContent(cursorX, cursorY, r, nil, selectedStyle)
}
func (window *Window) Draw() {
@ -426,24 +430,23 @@ func (window *Window) input(ev *tcell.EventKey) {
func (window *Window) mouseInput(ev *tcell.EventMouse) {
mouseX, mouseY := ev.Position()
bufferMouseX, bufferMouseY := window.AbsolutePosToBufferArea(mouseX, mouseY)
// Left click was pressed
if ev.Buttons() == tcell.Button1 {
// Ensure click was in buffer area
x1, y1, x2, y2 := window.GetTextAreaDimensions()
if mouseX >= x1 && mouseY >= y1 && mouseX <= x2 && mouseY <= y2 {
bufferMouseX, bufferMouseY := window.AbsolutePosToCursorPos2D(mouseX, mouseY)
if mouseHeld {
// Add to selection
if window.CurrentBuffer.Selection == nil {
window.CurrentBuffer.Selection = &Selection{
selectionStart: window.CurrentBuffer.CursorPos,
selectionEnd: window.CursorPos2DToCursorPos(bufferMouseX+window.CurrentBuffer.OffsetX, bufferMouseY+window.CurrentBuffer.OffsetY),
selectionEnd: window.CursorPos2DToCursorPos(bufferMouseX, bufferMouseY),
}
return
} else {
window.CurrentBuffer.Selection.selectionEnd = window.CursorPos2DToCursorPos(bufferMouseX+window.CurrentBuffer.OffsetX, bufferMouseY+window.CurrentBuffer.OffsetY)
window.CurrentBuffer.Selection.selectionEnd = window.CursorPos2DToCursorPos(bufferMouseX, bufferMouseY)
}
// Prevent selecting dummy character at the end of the buffer
if window.CurrentBuffer.Selection.selectionEnd >= len(window.CurrentBuffer.Contents) {
@ -456,7 +459,7 @@ func (window *Window) mouseInput(ev *tcell.EventMouse) {
}
}
// Move cursor
window.SetCursorPos2D(bufferMouseX+window.CurrentBuffer.OffsetX, bufferMouseY+window.CurrentBuffer.OffsetY)
window.SetCursorPos2D(bufferMouseX, bufferMouseY)
}
mouseHeld = true
} else if ev.Buttons() == tcell.ButtonNone {
@ -531,12 +534,48 @@ func (window *Window) CursorPos2DToCursorPos(x, y int) int {
return lines[y].charIndex + x
}
func (window *Window) AbsolutePosToBufferArea(x, y int) (int, int) {
func (window *Window) AbsolutePosToCursorPos2D(x, y int) (int, int) {
x1, y1, _, _ := window.GetTextAreaDimensions()
x -= x1
y -= y1
x += window.CurrentBuffer.OffsetX
y += window.CurrentBuffer.OffsetY
if x < 0 {
x = 0
}
if y < 0 {
y = 0
}
split := strings.SplitAfter(window.CurrentBuffer.Contents+" ", "\n")
if y >= len(split) {
y = len(split) - 1
}
line := split[y]
posInLine := make([]int, 0)
for i, char := range []rune(line) {
if char == '\t' {
for j := 0; j < 4; j++ {
posInLine = append(posInLine, i)
}
} else {
posInLine = append(posInLine, i)
}
}
if len(posInLine) == 0 {
x = 0
} else if x >= len(posInLine) {
x = posInLine[len(posInLine)-1]
} else {
x = posInLine[x]
}
return x, y
}