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package editor
import (
"strings"
"glint/internal/theme"
tea "github.com/charmbracelet/bubbletea"
"github.com/charmbracelet/lipgloss"
)
// Position is a cursor location in rune coordinates.
type Position struct {
Row, Col int
}
// Editor is a self-contained markdown text buffer. It knows nothing about
// files or the vault; the app wires load and save around it.
type Editor struct {
Lines []string
Cursor Position
Scroll int
Dirty bool
Width int
Height int // visible text rows
goalCol int // remembered visual column for vertical moves
theme theme.Theme
}
// New returns an empty editor with one blank line and the default theme.
func New() *Editor {
return &Editor{
Lines: []string{""},
theme: theme.FlexokiDark(),
Width: 80,
Height: 24,
}
}
// SetTheme swaps the active theme; the next View re-scans with the new colors.
func (e *Editor) SetTheme(t theme.Theme) { e.theme = t }
// SetContent replaces the buffer, resetting cursor, scroll, and dirty state.
func (e *Editor) SetContent(b []byte) {
text := strings.ReplaceAll(string(b), "\r\n", "\n")
e.Lines = strings.Split(text, "\n")
if len(e.Lines) == 0 {
e.Lines = []string{""}
}
e.Cursor = Position{}
e.Scroll = 0
e.goalCol = 0
e.Dirty = false
}
// Bytes serializes the buffer with \n line separators.
func (e *Editor) Bytes() []byte {
return []byte(strings.Join(e.Lines, "\n"))
}
// SetSize records the viewport dimensions (h = visible text rows).
func (e *Editor) SetSize(w, h int) {
e.Width = w
if h < 1 {
h = 1
}
e.Height = h
e.followCursor()
}
func (e *Editor) curLine() []rune { return []rune(e.Lines[e.Cursor.Row]) }
func (e *Editor) setLine(rs []rune) { e.Lines[e.Cursor.Row] = string(rs) }
// InsertRune inserts r at the cursor and advances it.
func (e *Editor) InsertRune(r rune) {
rs := e.curLine()
col := clamp(e.Cursor.Col, 0, len(rs))
rs = append(rs[:col], append([]rune{r}, rs[col:]...)...)
e.setLine(rs)
e.Cursor.Col = col + 1
e.Dirty = true
e.setGoal()
e.followCursor()
}
// InsertNewline splits the current line at the cursor.
func (e *Editor) InsertNewline() {
rs := e.curLine()
col := clamp(e.Cursor.Col, 0, len(rs))
left, right := string(rs[:col]), string(rs[col:])
e.Lines[e.Cursor.Row] = left
rest := append([]string{right}, e.Lines[e.Cursor.Row+1:]...)
e.Lines = append(e.Lines[:e.Cursor.Row+1], rest...)
e.Cursor.Row++
e.Cursor.Col = 0
e.Dirty = true
e.setGoal()
e.followCursor()
}
// Backspace deletes the rune before the cursor, joining lines at column 0.
func (e *Editor) Backspace() {
if e.Cursor.Col > 0 {
rs := e.curLine()
rs = append(rs[:e.Cursor.Col-1], rs[e.Cursor.Col:]...)
e.setLine(rs)
e.Cursor.Col--
e.Dirty = true
e.setGoal()
e.followCursor()
return
}
if e.Cursor.Row == 0 {
return
}
prev := []rune(e.Lines[e.Cursor.Row-1])
joinCol := len(prev)
merged := string(prev) + e.Lines[e.Cursor.Row]
e.Lines[e.Cursor.Row-1] = merged
e.Lines = append(e.Lines[:e.Cursor.Row], e.Lines[e.Cursor.Row+1:]...)
e.Cursor.Row--
e.Cursor.Col = joinCol
e.Dirty = true
e.setGoal()
e.followCursor()
}
// Delete removes the rune at the cursor, joining the next line at end-of-line.
func (e *Editor) Delete() {
rs := e.curLine()
if e.Cursor.Col < len(rs) {
rs = append(rs[:e.Cursor.Col], rs[e.Cursor.Col+1:]...)
e.setLine(rs)
e.Dirty = true
e.setGoal()
e.followCursor()
return
}
if e.Cursor.Row >= len(e.Lines)-1 {
return
}
e.Lines[e.Cursor.Row] = e.Lines[e.Cursor.Row] + e.Lines[e.Cursor.Row+1]
e.Lines = append(e.Lines[:e.Cursor.Row+1], e.Lines[e.Cursor.Row+2:]...)
e.Dirty = true
e.setGoal()
e.followCursor()
}
// MoveLeft moves one rune left, wrapping to the end of the previous line.
func (e *Editor) MoveLeft() {
if e.Cursor.Col > 0 {
e.Cursor.Col--
} else if e.Cursor.Row > 0 {
e.Cursor.Row--
e.Cursor.Col = len([]rune(e.Lines[e.Cursor.Row]))
}
e.setGoal()
e.followCursor()
}
// MoveRight moves one rune right, wrapping to the start of the next line.
func (e *Editor) MoveRight() {
if e.Cursor.Col < len(e.curLine()) {
e.Cursor.Col++
} else if e.Cursor.Row < len(e.Lines)-1 {
e.Cursor.Row++
e.Cursor.Col = 0
}
e.setGoal()
e.followCursor()
}
// MoveUp moves to the previous visual row, keeping the goal column.
func (e *Editor) MoveUp() {
rows := e.buildVisual()
ci := cursorVIndex(rows, e.Cursor)
if ci <= 0 {
return
}
e.applyGoal(rows[ci-1])
e.followCursor()
}
// MoveDown moves to the next visual row, keeping the goal column.
func (e *Editor) MoveDown() {
rows := e.buildVisual()
ci := cursorVIndex(rows, e.Cursor)
if ci < 0 || ci+1 >= len(rows) {
return
}
e.applyGoal(rows[ci+1])
e.followCursor()
}
// applyGoal places the cursor at the goal column on the given visual row.
func (e *Editor) applyGoal(target vrow) {
e.Cursor.Row = target.logRow
e.Cursor.Col = target.start + min(e.goalCol, target.runes)
}
// MoveHome moves to column 0.
func (e *Editor) MoveHome() {
e.Cursor.Col = 0
e.setGoal()
e.followCursor()
}
// MoveEnd moves to end of line.
func (e *Editor) MoveEnd() {
e.Cursor.Col = len(e.curLine())
e.setGoal()
e.followCursor()
}
// followCursor scrolls the viewport so the cursor's visual row stays visible.
func (e *Editor) followCursor() {
rows := e.buildVisual()
ci := cursorVIndex(rows, e.Cursor)
if ci < 0 {
e.Scroll = 0
return
}
if ci < e.Scroll {
e.Scroll = ci
}
if ci >= e.Scroll+e.Height {
e.Scroll = ci - e.Height + 1
}
if e.Scroll < 0 {
e.Scroll = 0
}
}
// setGoal records the cursor's current visual column as the goal for vertical moves.
func (e *Editor) setGoal() { e.goalCol = e.visualColOf(e.Cursor.Row, e.Cursor.Col) }
// visualColOf returns the column of (row, col) within its visual segment.
func (e *Editor) visualColOf(row, col int) int {
segs := wrapLine(e.Lines[row], e.Width)
for i := len(segs) - 1; i >= 0; i-- {
if col >= segs[i].start {
return col - segs[i].start
}
}
return col
}
// HandleKey maps a key message to a buffer operation.
func (e *Editor) HandleKey(k tea.KeyMsg) {
switch k.Type {
case tea.KeyRunes, tea.KeySpace:
// Real bubbletea reports a space as KeySpace with Runes == [' '], so the
// loop already inserts it — do not add a second space here.
for _, r := range k.Runes {
e.InsertRune(r)
}
case tea.KeyEnter:
e.InsertNewline()
case tea.KeyBackspace:
e.Backspace()
case tea.KeyDelete:
e.Delete()
case tea.KeyLeft:
e.MoveLeft()
case tea.KeyRight:
e.MoveRight()
case tea.KeyUp:
e.MoveUp()
case tea.KeyDown:
e.MoveDown()
case tea.KeyHome:
e.MoveHome()
case tea.KeyEnd:
e.MoveEnd()
case tea.KeyTab:
e.InsertRune('\t')
}
}
// View renders the visible visual rows, styled, with a themed cursor cell on
// the cursor's visual row. Output is e.Width columns wide; the app adds margins.
func (e *Editor) View() string {
cursorStyle := lipgloss.NewStyle().Foreground(e.theme.Background).Background(e.theme.Pointer)
rows := e.buildVisual()
ci := cursorVIndex(rows, e.Cursor)
var b strings.Builder
end := e.Scroll + e.Height
if end > len(rows) {
end = len(rows)
}
for r := e.Scroll; r < end; r++ {
if r == ci {
b.WriteString(renderSpansCursor(rows[r].spans, e.Cursor.Col-rows[r].start, cursorStyle))
} else {
b.WriteString(renderSpans(rows[r].spans))
}
b.WriteByte('\n')
}
for r := end; r < e.Scroll+e.Height; r++ {
b.WriteByte('\n')
}
return b.String()
}
func clamp(v, lo, hi int) int {
if v < lo {
return lo
}
if v > hi {
return hi
}
return v
}
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