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|
package editor
import (
"path/filepath"
"strings"
"glint/internal/spell"
"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
anchor *Position // selection anchor; nil = no selection
theme theme.Theme
undo []snapshot // edit checkpoints, oldest first (TASK-006)
redo []snapshot // undone checkpoints awaiting redo
lastKind editKind // kind of the last recorded group, for coalescing
find []match // in-document find matches, document order (TASK-007)
findActive int // index of the active match in find, -1 = none
findQuery string // current find query
codeFile string // filename for the chroma lexer; "" = prose/markdown scanner (TASK-018)
buildCount int // count of buildVisual scans; perf guard for tests (TASK-004)
visual []vrow // memoized scan+wrap model; nil = stale, rebuilt lazily
dict *spell.Dict // loaded spellchecker; nil = inert (TASK-020)
spellOn bool // session spellcheck toggle
spellCache map[string]bool // word -> known, cleared when the personal dict changes
spellIgnore map[string]bool // words ignored for this session only
}
// SetLanguage selects the scanner from the file's extension: markdown/text/no
// extension keep the prose scanner; any other extension uses the code scanner,
// with the base filename passed to chroma for lexer selection.
func (e *Editor) SetLanguage(path string) {
switch strings.ToLower(filepath.Ext(path)) {
case "", ".md", ".markdown", ".mdx", ".txt", ".text":
e.codeFile = ""
default:
e.codeFile = filepath.Base(path)
}
e.invalidate()
}
// 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; e.invalidate() }
// 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
e.resetHistory()
e.ClearFind()
e.invalidate()
}
// 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.invalidate() // width change alters wrapping
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) }
// KillToLineStart deletes from the start of the line to the cursor and parks the
// cursor at column 0 (Ctrl+U; the macOS Cmd+Delete behavior).
func (e *Editor) KillToLineStart() {
if e.Cursor.Col == 0 {
return
}
e.setLine(e.curLine()[e.Cursor.Col:])
e.Cursor.Col = 0
e.Dirty = true
e.setGoal()
e.followCursor()
}
// MoveToVisual places the cursor at absolute visual row vi, col runes into that
// row — used to map a mouse click (after the caller subtracts margins/scroll) to
// a buffer position. Indices are clamped to the document.
func (e *Editor) MoveToVisual(vi, col int) {
rows := e.buildVisual()
if len(rows) == 0 {
return
}
if vi < 0 {
vi = 0
}
if vi >= len(rows) {
vi = len(rows) - 1
}
vr := rows[vi]
if col < 0 {
col = 0
}
if col > vr.runes {
col = vr.runes
}
e.Cursor.Row = vr.logRow
e.Cursor.Col = vr.start + col
e.setGoal()
e.followCursorWith(rows)
}
// ScrollBy moves the viewport by delta visual rows (negative = up) without
// moving the cursor, clamped so it never scrolls past the content.
func (e *Editor) ScrollBy(delta int) {
max := len(e.buildVisual()) - e.Height
if max < 0 {
max = 0
}
e.Scroll += delta
if e.Scroll < 0 {
e.Scroll = 0
}
if e.Scroll > max {
e.Scroll = max
}
}
// GotoLine moves the cursor to the start of 1-based line n, clamped to the
// document (TASK-012).
func (e *Editor) GotoLine(n int) {
row := n - 1
if row < 0 {
row = 0
}
if row > len(e.Lines)-1 {
row = len(e.Lines) - 1
}
e.Cursor = Position{Row: row, Col: 0}
e.anchor = nil
e.setGoal()
e.followCursor()
}
// SetCursor parks the cursor at p, clamped to a valid document position. Used to
// restore a remembered position when reopening a file (TASK-012).
func (e *Editor) SetCursor(p Position) {
if p.Row < 0 {
p.Row = 0
}
if p.Row > len(e.Lines)-1 {
p.Row = len(e.Lines) - 1
}
maxCol := len([]rune(e.Lines[p.Row]))
if p.Col < 0 {
p.Col = 0
}
if p.Col > maxCol {
p.Col = maxCol
}
e.Cursor = p
e.anchor = nil
e.setGoal()
e.followCursor()
}
// MoveDocStart jumps to the very start of the document (Cmd+Up via the terminal).
func (e *Editor) MoveDocStart() {
e.Cursor = Position{Row: 0, Col: 0}
e.setGoal()
e.followCursor()
}
// MoveDocEnd jumps to the end of the last line (Cmd+Down via the terminal).
func (e *Editor) MoveDocEnd() {
last := len(e.Lines) - 1
e.Cursor.Row = last
e.Cursor.Col = len([]rune(e.Lines[last]))
e.setGoal()
e.followCursor()
}
func isWordSpace(r rune) bool { return r == ' ' || r == '\t' }
// MoveWordLeft moves to the start of the previous word (Alt+Left).
func (e *Editor) MoveWordLeft() {
if e.Cursor.Col == 0 {
if e.Cursor.Row > 0 {
e.Cursor.Row--
e.Cursor.Col = len(e.curLine())
}
} else {
rs := e.curLine()
c := e.Cursor.Col
for c > 0 && isWordSpace(rs[c-1]) {
c--
}
for c > 0 && !isWordSpace(rs[c-1]) {
c--
}
e.Cursor.Col = c
}
e.setGoal()
e.followCursor()
}
// MoveWordRight moves to the end of the next word (Alt+Right).
func (e *Editor) MoveWordRight() {
rs := e.curLine()
if e.Cursor.Col >= len(rs) {
if e.Cursor.Row < len(e.Lines)-1 {
e.Cursor.Row++
e.Cursor.Col = 0
}
} else {
c := e.Cursor.Col
for c < len(rs) && isWordSpace(rs[c]) {
c++
}
for c < len(rs) && !isWordSpace(rs[c]) {
c++
}
e.Cursor.Col = c
}
e.setGoal()
e.followCursor()
}
// DeleteWordLeft deletes the word before the cursor (Alt+Backspace).
func (e *Editor) DeleteWordLeft() {
if e.Cursor.Col == 0 {
e.Backspace() // at line start, fall back to joining lines
return
}
rs := e.curLine()
end := e.Cursor.Col
start := end
for start > 0 && isWordSpace(rs[start-1]) {
start--
}
for start > 0 && !isWordSpace(rs[start-1]) {
start--
}
e.setLine(append(rs[:start], rs[end:]...))
e.Cursor.Col = start
e.Dirty = true
e.setGoal()
e.followCursor()
}
// DeleteWordRight deletes the word after the cursor (Alt+D).
func (e *Editor) DeleteWordRight() {
rs := e.curLine()
if e.Cursor.Col >= len(rs) {
e.Delete() // at line end, fall back to joining lines
return
}
c := e.Cursor.Col
end := c
for end < len(rs) && isWordSpace(rs[end]) {
end++
}
for end < len(rs) && !isWordSpace(rs[end]) {
end++
}
e.setLine(append(rs[:c], rs[end:]...))
e.Dirty = true
e.setGoal()
e.followCursor()
}
// KillToLineEnd deletes from the cursor to the end of the line (Ctrl+K).
func (e *Editor) KillToLineEnd() {
rs := e.curLine()
if e.Cursor.Col >= len(rs) {
return
}
e.setLine(rs[:e.Cursor.Col])
e.Dirty = true
e.setGoal()
e.followCursor()
}
// 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()
}
// autoClose maps an opening rune to the closer auto-inserted after it (TASK-012).
func autoClose(r rune) (rune, bool) {
switch r {
case '(':
return ')', true
case '[':
return ']', true
case '`':
return '`', true
}
return 0, false
}
func isAutoCloser(r rune) bool { return r == ')' || r == ']' || r == '`' }
// typeRune inserts a single typed rune with auto-close behavior: an opening
// bracket or backtick inserts its matching closer with the cursor between the
// pair; typing a closer when that same closer already sits to the cursor's right
// steps over it instead of inserting a duplicate. Anything else inserts plainly.
func (e *Editor) typeRune(r rune) {
rs := e.curLine()
if isAutoCloser(r) && e.Cursor.Col < len(rs) && rs[e.Cursor.Col] == r {
e.MoveRight()
return
}
if closer, ok := autoClose(r); ok {
e.insertPair(string(r), string(closer), 1)
return
}
e.InsertRune(r)
}
// 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.followCursorWith(rows)
}
// 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.followCursorWith(rows)
}
// applyGoal places the cursor at the goal column on the visual row at idx. For a
// non-last visual segment of a wrapped line, the column is clamped to runes-1:
// start+runes is the next segment's first column, so landing there would skip
// the cursor onto the following visual row.
func (e *Editor) applyGoal(rows []vrow, idx int) {
t := rows[idx]
maxCol := t.runes
if idx+1 < len(rows) && rows[idx+1].logRow == t.logRow && maxCol > 0 {
maxCol-- // non-last segment of this logical line
}
e.Cursor.Row = t.logRow
e.Cursor.Col = t.start + min(e.goalCol, maxCol)
}
// MoveHome implements smart Home: it moves to the first non-whitespace column,
// or to column 0 if already there (toggling between the two). A blank or
// whitespace-only line goes straight to column 0 (TASK-012).
func (e *Editor) MoveHome() {
rs := e.curLine()
first := 0
for first < len(rs) && isWordSpace(rs[first]) {
first++
}
if first == len(rs) {
first = 0 // nothing but whitespace
}
if e.Cursor.Col == first {
e.Cursor.Col = 0
} else {
e.Cursor.Col = first
}
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() { e.followCursorWith(e.buildVisual()) }
// followCursorWith is followCursor against an already-built visual model, so a
// caller that just scanned (MoveUp/MoveDown/MoveToVisual) reuses those rows
// instead of triggering a second O(document) scan (TASK-004).
func (e *Editor) followCursorWith(rows []vrow) {
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, recording an undo
// checkpoint around any mutation. Navigation breaks typing coalescing so a
// later edit starts a fresh group.
func (e *Editor) HandleKey(k tea.KeyMsg) {
kind, mutates := editKindOf(k)
if !mutates {
e.lastKind = kindNone
e.dispatch(k)
return
}
e.invalidate() // mutating key: drop the cache so dispatch rebuilds from new content
// Continuing a typing run: extend the existing group, no new checkpoint.
if kind == kindType && e.lastKind == kindType && len(e.undo) > 0 {
e.dispatch(k)
e.redo = nil
return
}
pre := e.snapshot()
e.dispatch(k)
if e.sameContent(pre) {
return // no-op key (e.g. backspace at start of doc): don't record
}
e.pushUndoSnapshot(pre)
e.redo = nil
e.lastKind = kind
}
// dispatch performs the raw buffer operation for a key, without undo bookkeeping.
func (e *Editor) dispatch(k tea.KeyMsg) {
switch k.Type {
// Text input — replaces any active selection.
case tea.KeyRunes:
// Option-as-Meta terminals send Option+Left/Right as Alt+b / Alt+f
// (readline word motion). Handle those and never insert an Alt-runed key.
if k.Alt {
switch string(k.Runes) {
case "b":
e.MoveWordLeft()
case "f":
e.MoveWordRight()
case "d":
e.DeleteWordRight()
case "s": // bold (strong)
e.WrapBold()
case "i": // italic
e.WrapItalic()
case "c": // inline code
e.WrapCode()
case "k": // link
e.WrapLink()
case "x": // toggle checkbox (TASK-023)
e.ToggleCheckbox()
}
return
}
// With a selection, typing a wrap punctuation surrounds it (nests on
// repeat) instead of replacing it.
if e.HasSelection() && len(k.Runes) == 1 {
if rc, ok := wrapPair(k.Runes[0]); ok {
e.surroundSelection(string(k.Runes[0]), string(rc))
return
}
}
// No selection: a single rune goes through auto-close handling.
if !e.HasSelection() && len(k.Runes) == 1 {
e.typeRune(k.Runes[0])
return
}
e.replaceSelection()
for _, r := range k.Runes {
e.InsertRune(r)
}
case tea.KeySpace:
e.replaceSelection()
if len(k.Runes) == 0 {
e.InsertRune(' ')
}
for _, r := range k.Runes {
e.InsertRune(r)
}
case tea.KeyEnter:
e.replaceSelection()
if !e.ContinueList() {
e.InsertNewline()
}
case tea.KeyTab:
if e.onListItem() {
e.IndentLine()
} else {
e.replaceSelection()
e.InsertRune('\t')
}
case tea.KeyShiftTab:
if e.onListItem() {
e.OutdentLine()
}
// Deletion — a selection is removed wholesale.
case tea.KeyBackspace:
if e.DeleteSelection() {
return
}
if k.Alt {
e.DeleteWordLeft()
} else {
e.Backspace()
}
case tea.KeyDelete:
if e.DeleteSelection() {
return
}
e.Delete()
case tea.KeyCtrlU:
e.KillToLineStart()
case tea.KeyCtrlK:
e.KillToLineEnd()
case tea.KeyCtrlW:
e.DeleteWordLeft()
// Plain movement collapses the selection.
case tea.KeyLeft:
e.ClearSelection()
if k.Alt {
e.MoveWordLeft()
} else {
e.MoveLeft()
}
case tea.KeyRight:
e.ClearSelection()
if k.Alt {
e.MoveWordRight()
} else {
e.MoveRight()
}
case tea.KeyUp:
if k.Alt {
e.MoveLineUp() // reorder the current line (TASK-024)
return
}
e.ClearSelection()
e.MoveUp()
case tea.KeyDown:
if k.Alt {
e.MoveLineDown() // reorder the current line (TASK-024)
return
}
e.ClearSelection()
e.MoveDown()
case tea.KeyCtrlUp:
e.ClearSelection()
e.MoveHome()
case tea.KeyCtrlDown:
e.ClearSelection()
e.MoveEnd()
case tea.KeyHome:
e.ClearSelection()
e.MoveDocStart()
case tea.KeyEnd:
e.ClearSelection()
e.MoveDocEnd()
// Shift movement extends the selection.
case tea.KeyShiftLeft:
e.startSelection()
e.MoveLeft()
case tea.KeyShiftRight:
e.startSelection()
e.MoveRight()
case tea.KeyShiftUp:
e.startSelection()
e.MoveUp()
case tea.KeyShiftDown:
e.startSelection()
e.MoveDown()
case tea.KeyShiftHome:
e.startSelection()
e.MoveDocStart()
case tea.KeyShiftEnd:
e.startSelection()
e.MoveDocEnd()
case tea.KeyCtrlShiftLeft:
e.startSelection()
e.MoveWordLeft()
case tea.KeyCtrlShiftRight:
e.startSelection()
e.MoveWordRight()
case tea.KeyCtrlShiftUp:
e.startSelection()
e.MoveHome()
case tea.KeyCtrlShiftDown:
e.startSelection()
e.MoveEnd()
}
}
// replaceSelection deletes the selection (if any) so the next insert overwrites it.
func (e *Editor) replaceSelection() { e.DeleteSelection() }
// 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)
selStyle := lipgloss.NewStyle().Foreground(e.theme.SelFg).Background(e.theme.SelBg)
findStyle := lipgloss.NewStyle().Foreground(e.theme.Text).Background(e.theme.Highlight)
findActiveStyle := lipgloss.NewStyle().Foreground(e.theme.SelFg).Background(e.theme.SelBg)
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++ {
spans := rows[r].spans
if a, bb, ok := e.selectionForRow(rows[r]); ok {
spans = overlaySelection(spans, a, bb, selStyle)
}
for _, m := range e.matchRangesForRow(rows[r]) {
st := findStyle
if m.active {
st = findActiveStyle
}
spans = overlaySelection(spans, m.a, m.b, st)
}
if r == ci {
b.WriteString(renderSpansCursor(spans, e.Cursor.Col-rows[r].start, cursorStyle))
} else {
b.WriteString(renderSpans(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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