Refactoring and fixing display issues

.gitignore

@@ -0,0 +1 @@
+.gemini

inputrc/inputrc_test.go

@@ -207,7 +207,7 @@ func buildOpts(t *testing.T, buf []byte) []Option {
 	lines := bytes.Split(bytes.TrimSpace(buf), []byte{'\n'})
 	var opts []Option
 
-	for i := 0; i < len(lines); i++ {
+	for i := range lines {
 		line := bytes.TrimSpace(lines[i])
 		// If the line is empty, keep going
 		if len(line) == 0 {
@@ -406,4 +406,4 @@ func readTestdata(name string) ([]byte, error) {
 }
 
 //go:embed testdata/*.inputrc
-var testdata embed.FS
+var testdata embed.FS

inputrc/parse.go

@@ -507,11 +507,11 @@ func findStringEnd(seq []rune, pos, end int) (int, bool) {
 	quote := seq[pos]
 
 	for pos++; pos < end; pos++ {
-		switch char = seq[pos]; {
-		case char == '\\':
+		switch char = seq[pos]; char {
+		case '\\':
 			pos++
 			continue
-		case char == quote:
+		case quote:
 			return pos + 1, true
 		}
 	}

internal/core/cursor.go

@@ -247,12 +247,12 @@ func (c *Cursor) LineMove(lines int) {
 	}
 
 	if lines < 0 {
-		for i := 0; i < -1*lines; i++ {
+		for i := 0; i < -lines; i++ {
 			c.moveLineUp()
 			c.CheckCommand()
 		}
 	} else {
-		for i := 0; i < lines; i++ {
+		for range lines {
 			c.moveLineDown()
 			c.CheckCommand()
 		}
@@ -287,7 +287,7 @@ func (c *Cursor) AtBeginningOfLine() bool {
 
 	newlines := c.line.newlines()
 
-	for line := 0; line < len(newlines); line++ {
+	for line := range newlines {
 		epos := newlines[line][0]
 		if epos == c.pos-1 {
 			return true
@@ -306,7 +306,7 @@ func (c *Cursor) AtEndOfLine() bool {
 
 	newlines := c.line.newlines()
 
-	for line := 0; line < len(newlines); line++ {
+	for line := range newlines {
 		epos := newlines[line][0]
 		if epos == c.pos+1 {
 			return true
@@ -394,7 +394,7 @@ func (c *Cursor) moveLineDown() {
 
 	newlines := c.line.newlines()
 
-	for line := 0; line < len(newlines); line++ {
+	for line := range newlines {
 		end := newlines[line][0]
 		if line < c.LinePos() {
 			begin = end

internal/core/keys.go

@@ -7,9 +7,10 @@ import (
 	"regexp"
 	"sync"
 
+	"github.com/rivo/uniseg"
+
 	"github.com/reeflective/readline/inputrc"
 	"github.com/reeflective/readline/internal/strutil"
-	"github.com/rivo/uniseg"
 )
 
 const (

internal/core/selection_test.go

@@ -1259,7 +1259,7 @@ func TestSelection_SelectKeyword(t *testing.T) {
 			var gotKbpos, gotKepos int
 			var gotMatch bool
 
-			for i := 0; i < test.args.cycles; i++ {
+			for range test.args.cycles {
 				gotKbpos, gotKepos, gotMatch = sel.SelectKeyword(test.args.bpos, test.args.epos, test.args.next)
 			}
 

internal/display/engine.go

@@ -66,42 +66,6 @@ func Init(e *Engine, highlighter func([]rune) string) {
 	e.highlighter = highlighter
 }
 
-// Refresh recomputes and redisplays the entire readline interface, except
-// the first lines of the primary prompt when the latter is a multiline one.
-func (e *Engine) Refresh() {
-	fmt.Print(term.HideCursor)
-
-	// Go back to the first column, and if the primary prompt
-	// was not printed yet, back up to the line's beginning row.
-	term.MoveCursorBackwards(term.GetWidth())
-
-	if !e.primaryPrinted {
-		term.MoveCursorUp(e.cursorRow)
-	}
-
-	// Print either all or the last line of the prompt.
-	e.prompt.LastPrint()
-
-	// Get all positions required for the redisplay to come:
-	// prompt end (thus indentation), cursor positions, etc.
-	e.computeCoordinates(true)
-
-	// Print the line, and any of the secondary and right prompts.
-	e.displayLine()
-	e.displayMultilinePrompts()
-
-	// Display hints and completions, go back
-	// to the start of the line, then to cursor.
-	helpersMoved := e.displayHelpers()
-	if helpersMoved {
-		e.cursorHintToLineStart()
-		e.lineStartToCursorPos()
-	} else {
-		e.lineEndToCursorPos()
-	}
-	fmt.Print(term.ShowCursor)
-}
-
 // PrintPrimaryPrompt redraws the primary prompt.
 // There are relatively few cases where you want to use this.
 // It is currently only used when using clear-screen commands.
@@ -274,70 +238,6 @@ func (e *Engine) displayLine() {
 	}
 }
 
-func (e *Engine) displayMultilinePrompts() {
-	// If we have more than one line, write the columns.
-	if e.line.Lines() > 1 {
-		term.MoveCursorUp(e.lineRows)
-		term.MoveCursorBackwards(term.GetWidth())
-		e.prompt.MultilineColumnPrint()
-	}
-
-	// Then if we have a line at all, rewrite the last column
-	// character with any secondary prompt available.
-	if e.line.Lines() > 0 {
-		term.MoveCursorBackwards(term.GetWidth())
-		e.prompt.SecondaryPrint()
-		term.MoveCursorBackwards(term.GetWidth())
-		term.MoveCursorForwards(e.lineCol)
-	}
-
-	// Then prompt the right-sided prompt if possible.
-	e.prompt.RightPrint(e.lineCol, true)
-}
-
-// displayHelpers renders the hint and completion sections.
-// It assumes that the cursor is on the last line of input,
-// and goes back to this same line after displaying this.
-func (e *Engine) displayHelpers() bool {
-	// Recompute completions and hints if autocompletion is on.
-	e.completer.Autocomplete()
-
-	hintRows := ui.CoordinatesHint(e.hint)
-	compMatches := e.completer.Matches()
-	compSkip := e.completer.DisplaySkipped()
-
-	if e.hintRows == 0 && e.compRows == 0 && hintRows == 0 && (compMatches == 0 || compSkip) {
-		return false
-	}
-
-	fmt.Print(term.NewlineReturn)
-
-	prevHintRows := e.hintRows
-	prevCompRows := e.compRows
-
-	// Display hint and completions.
-	ui.DisplayHint(e.hint)
-	e.hintRows = ui.CoordinatesHint(e.hint)
-	if compMatches > 0 && !compSkip {
-		completion.Display(e.completer, e.AvailableHelperLines())
-		e.compRows = completion.Coordinates(e.completer)
-	} else {
-		e.completer.ResetUsedRows()
-		e.compRows = 0
-	}
-
-	if e.hintRows+e.compRows < prevHintRows+prevCompRows {
-		fmt.Print(term.ClearScreenBelow)
-	}
-
-	// Go back to the first line below the input line.
-	term.MoveCursorBackwards(term.GetWidth())
-	term.MoveCursorUp(e.compRows)
-	term.MoveCursorUp(e.hintRows)
-
-	return true
-}
-
 // lineEndToCursorPos moves the cursor from the end of the input line
 // to the current cursor position.
 func (e *Engine) lineEndToCursorPos() {

internal/display/highlight.go

@@ -22,14 +22,18 @@ func (e *Engine) highlightLine(line []rune, selection core.Selection) string {
 	var highlighted string
 
 	// And apply highlighting before each rune.
+	var highlightedSb25 strings.Builder
+
 	for i, r := range line {
 		if highlight, found := colors[i]; found {
-			highlighted += string(highlight)
+			highlightedSb25.WriteString(string(highlight))
 		}
 
-		highlighted += string(r)
+		highlightedSb25.WriteRune(r)
 	}
 
+	highlighted += highlightedSb25.String()
+
 	// Finally, highlight comments using a regex.
 	comment := strings.Trim(e.opts.GetString("comment-begin"), "\"")
 	commentPattern := fmt.Sprintf(`(^|\s)%s.*`, comment)