feat: syntax highlighting powered by chroma.

This is sick! It is not perfect, highlight groups would be cool, but for
now this works!

cmd/gim/main.go

@@ -4,12 +4,17 @@ import (
 	"os"
 
 	"git.gophernest.net/azpect/TextEditor/internal/program"
+	"git.gophernest.net/azpect/TextEditor/internal/theme"
 	tea "github.com/charmbracelet/bubbletea"
 )
 
 // main: Entry point for the Gim text editor. Creates a buffer and window,
 // initializes the editor model, and runs the BubbleTea TUI program.
 func main() {
+	if err := theme.RegisterAll(); err != nil {
+		panic(err)
+	}
+
 	// <exe> <filename>
 	args := os.Args[1:]
 

go.mod

@@ -3,6 +3,7 @@ module git.gophernest.net/azpect/TextEditor
 go 1.25.5
 
 require (
+	github.com/alecthomas/chroma/v2 v2.23.1
 	github.com/charmbracelet/bubbletea v1.3.10
 	github.com/charmbracelet/lipgloss v1.1.0
 	github.com/charmbracelet/x/exp/teatest v0.0.0-20260209132835-6b065b8ba62c
@@ -19,6 +20,7 @@ require (
 	github.com/clipperhouse/displaywidth v0.9.0 // indirect
 	github.com/clipperhouse/stringish v0.1.1 // indirect
 	github.com/clipperhouse/uax29/v2 v2.5.0 // indirect
+	github.com/dlclark/regexp2 v1.11.5 // indirect
 	github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f // indirect
 	github.com/lucasb-eyer/go-colorful v1.3.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect

go.sum

@@ -1,3 +1,9 @@
+github.com/alecthomas/assert/v2 v2.11.0 h1:2Q9r3ki8+JYXvGsDyBXwH3LcJ+WK5D0gc5E8vS6K3D0=
+github.com/alecthomas/assert/v2 v2.11.0/go.mod h1:Bze95FyfUr7x34QZrjL+XP+0qgp/zg8yS+TtBj1WA3k=
+github.com/alecthomas/chroma/v2 v2.23.1 h1:nv2AVZdTyClGbVQkIzlDm/rnhk1E9bU9nXwmZ/Vk/iY=
+github.com/alecthomas/chroma/v2 v2.23.1/go.mod h1:NqVhfBR0lte5Ouh3DcthuUCTUpDC9cxBOfyMbMQPs3o=
+github.com/alecthomas/repr v0.5.2 h1:SU73FTI9D1P5UNtvseffFSGmdNci/O6RsqzeXJtP0Qs=
+github.com/alecthomas/repr v0.5.2/go.mod h1:Fr0507jx4eOXV7AlPV6AVZLYrLIuIeSOWtW57eE/O/4=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1 h1:HwpRHbFMcZLEVr42D4p7XBqjyuxQH5SMiErDT4WkJ2k=
 github.com/aymanbagabas/go-osc52/v2 v2.0.1/go.mod h1:uYgXzlJ7ZpABp8OJ+exZzJJhRNQ2ASbcXHWsFqH8hp8=
 github.com/aymanbagabas/go-udiff v0.3.1 h1:LV+qyBQ2pqe0u42ZsUEtPiCaUoqgA9gYRDs3vj1nolY=
@@ -24,8 +30,12 @@ github.com/clipperhouse/stringish v0.1.1 h1:+NSqMOr3GR6k1FdRhhnXrLfztGzuG+VuFDfa
 github.com/clipperhouse/stringish v0.1.1/go.mod h1:v/WhFtE1q0ovMta2+m+UbpZ+2/HEXNWYXQgCt4hdOzA=
 github.com/clipperhouse/uax29/v2 v2.5.0 h1:x7T0T4eTHDONxFJsL94uKNKPHrclyFI0lm7+w94cO8U=
 github.com/clipperhouse/uax29/v2 v2.5.0/go.mod h1:Wn1g7MK6OoeDT0vL+Q0SQLDz/KpfsVRgg6W7ihQeh4g=
+github.com/dlclark/regexp2 v1.11.5 h1:Q/sSnsKerHeCkc/jSTNq1oCm7KiVgUMZRDUoRu0JQZQ=
+github.com/dlclark/regexp2 v1.11.5/go.mod h1:DHkYz0B9wPfa6wondMfaivmHpzrQ3v9q8cnmRbL6yW8=
 github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f h1:Y/CXytFA4m6baUTXGLOoWe4PQhGxaX0KpnayAqC48p4=
 github.com/erikgeiser/coninput v0.0.0-20211004153227-1c3628e74d0f/go.mod h1:vw97MGsxSvLiUE2X8qFplwetxpGLQrlU1Q9AUEIzCaM=
+github.com/hexops/gotextdiff v1.0.3 h1:gitA9+qJrrTCsiCl7+kh75nPqQt1cx4ZkudSTLoUqJM=
+github.com/hexops/gotextdiff v1.0.3/go.mod h1:pSWU5MAI3yDq+fZBTazCSJysOMbxWL1BSow5/V2vxeg=
 github.com/lucasb-eyer/go-colorful v1.3.0 h1:2/yBRLdWBZKrf7gB40FoiKfAWYQ0lqNcbuQwVHXptag=
 github.com/lucasb-eyer/go-colorful v1.3.0/go.mod h1:R4dSotOR9KMtayYi1e77YzuveK+i7ruzyGqttikkLy0=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=

internal/editor/model_builder.go

@@ -4,13 +4,86 @@ import (
 	"git.gophernest.net/azpect/TextEditor/internal/core"
 	"git.gophernest.net/azpect/TextEditor/internal/input"
 	"git.gophernest.net/azpect/TextEditor/internal/style"
+	"github.com/alecthomas/chroma/v2/styles"
 )
 
 type ModelBuilder struct {
 	model Model
 }
 
+// RPGLE
+// abap
+// algol
+// algol_nu
+// arduino
+// ashen
+// aura-theme-dark
+// aura-theme-dark-soft
+// autumn
+// average
+// base16-snazzy
+// borland
+// bw
+// catppuccin-frappe
+// catppuccin-latte
+// catppuccin-macchiato
+// catppuccin-mocha
+// colorful
+// doom-one
+// doom-one2
+// dracula
+// emacs
+// evergarden
+// friendly
+// fruity
+// github
+// github-dark
+// gruvbox
+// gruvbox-light
+// hr_high_contrast
+// hrdark
+// igor
+// lovelace
+// manni
+// modus-operandi
+// modus-vivendi
+// monokai
+// monokailight
+// murphy
+// native
+// nord
+// nordic
+// onedark
+// onesenterprise
+// paraiso-dark
+// paraiso-light
+// pastie
+// perldoc
+// pygments
+// rainbow_dash
+// rose-pine
+// rose-pine-dawn
+// rose-pine-moon
+// rrt
+// solarized-dark
+// solarized-dark256
+// solarized-light
+// swapoff
+// tango
+// tokyonight-day
+// tokyonight-moon
+// tokyonight-night
+// tokyonight-storm
+// trac
+// vim
+// vs
+// vulcan
+// witchhazel
+// xcode
+// xcode-dark
 func NewModelBuilder() *ModelBuilder {
+	chromaStyle := styles.Get("kanagawa-wave")
+
 	return &ModelBuilder{
 		model: Model{
 			buffers:        []*core.Buffer{},
@@ -28,7 +101,7 @@ func NewModelBuilder() *ModelBuilder {
 			commandOutput:  nil,
 			settings:       core.NewDefaultSettings(),
 			registers:      core.DefaultRegisters(),
-			styles:         style.DefaultStyles(),
+			styles:         style.ChromaStyles(chromaStyle),
 		},
 	}
 }

internal/editor/view.go

@@ -6,6 +6,8 @@ import (
 
 	"git.gophernest.net/azpect/TextEditor/internal/core"
 	"git.gophernest.net/azpect/TextEditor/internal/style"
+	"github.com/alecthomas/chroma/v2"
+	"github.com/alecthomas/chroma/v2/lexers"
 	"github.com/charmbracelet/lipgloss"
 )
 
@@ -49,17 +51,25 @@ func viewWindow(w *core.Window, styles style.Styles, options core.WinOptions, mo
 	start := w.ScrollY
 	end := w.ScrollY + w.ViewportHeight()
 
+	// Chroma stuff
+	name := strings.ReplaceAll(buf.Filetype, ".", "")
+	lexer := lexers.Get(name)
+	lexer = chroma.Coalesce(lexer) // Merge tokens together
+
 	// Draw buffer lines
 	for lineNum := start; lineNum < end; lineNum++ {
 		if lineNum < buf.LineCount() {
-			line := drawLine(w, styles, options, mode, buf.Line(lineNum), lineNum)
+			styleMap := styles.MakeStyleMap(lexer, buf.Line(lineNum))
+			line := drawLine(w, styles, options, mode, buf.Line(lineNum), lineNum, styleMap)
 			view.WriteString(line)
+		} else {
+			view.WriteString(strings.Repeat(styles.BackgroundStyle.Render(" "), w.Width))
 		}
 		view.WriteRune('\n')
 	}
 
 	// Draw status line
-	statusBar := drawStatusBar(w, mode)
+	statusBar := drawStatusBar(w, mode, styles)
 	view.WriteString(statusBar + "\n")
 
 	return view.String()
@@ -67,13 +77,9 @@ func viewWindow(w *core.Window, styles style.Styles, options core.WinOptions, mo
 
 // drawLine: Renders a single line with syntax highlighting, cursor, and visual selection.
 // Handles gutter, cursor rendering, and visual mode highlighting.
-func drawLine(w *core.Window, styles style.Styles, options core.WinOptions, mode core.Mode, line string, lineNumber int) string {
+func drawLine(w *core.Window, styles style.Styles, options core.WinOptions, mode core.Mode, line string, lineNumber int, styleMap []lipgloss.Style) string {
-	runes := []rune(line)
-
-	curStyle := styles.CursorStyle(mode)
-	visStyle := styles.VisualHighlight
-
 	var view strings.Builder
+	runes := []rune(line)
 
 	// Draw gutter first
 	gutter := drawGutter(w, styles, options, lineNumber)
@@ -84,24 +90,31 @@ func drawLine(w *core.Window, styles style.Styles, options core.WinOptions, mode
 		// Current char is cursor
 		if col == w.Cursor.Col && lineNumber == w.Cursor.Line {
 			if col < len(runes) {
-				view.WriteString(curStyle.Render(string(runes[col])))
+				cur := styles.CursorStyle(mode, styleMap[col])
+				view.WriteString(cur.Render(string(runes[col])))
 			} else {
-				view.WriteString(curStyle.Render(" "))
+				view.WriteString(styles.DefaultCursorStyle(mode).Render(" "))
 			}
 
 			// Not cursor, but not end
 		} else if col < len(runes) {
+			s := styleMap[col]
 			if mode.IsVisualMode() && posInsideSelection(w, mode, col, lineNumber) {
-				view.WriteString(visStyle.Render(string(runes[col])))
+				vis := styles.VisualHighlightWithTextColor(s)
+				view.WriteString(vis.Render(string(runes[col])))
 			} else {
-				view.WriteRune(runes[col])
+				view.WriteString(s.Render(string(runes[col])))
 			}
 			// Allow highlight on blank lines or chars
 		} else if mode.IsVisualMode() && posInsideSelection(w, mode, col, lineNumber) {
-			view.WriteString(visStyle.Render(" "))
+			view.WriteString(styles.VisualHighlight.Render(" "))
 		}
 	}
 
+	// Color the overflow
+	dif := w.Width - lipgloss.Width(line)
+	view.WriteString(strings.Repeat(styles.BackgroundStyle.Render(" "), dif))
+
 	return view.String()
 }
 
@@ -153,9 +166,9 @@ func drawGutter(w *core.Window, styles style.Styles, options core.WinOptions, cu
 
 // drawStatusBar: Renders the status bar with mode and cursor position,
 // padding the middle with spaces to fill the terminal width.
-func drawStatusBar(w *core.Window, mode core.Mode) string {
+func drawStatusBar(w *core.Window, mode core.Mode, styles style.Styles) string {
-	left := leftBar(w, mode)
+	left := leftBar(w, mode, styles)
-	right := rightBar(w, mode)
+	right := rightBar(w, mode, styles)
 
 	diff := w.Width - (lipgloss.Width(left) + lipgloss.Width(right))
 
@@ -164,12 +177,12 @@ func drawStatusBar(w *core.Window, mode core.Mode) string {
 		return ""
 	}
 
-	middle := strings.Repeat(" ", diff)
+	middle := strings.Repeat(styles.BackgroundStyle.Render(" "), diff)
 	return left + middle + right
 }
 
 // leftBar: Returns the left side of the status bar showing the current mode.
-func leftBar(w *core.Window, mode core.Mode) string {
+func leftBar(w *core.Window, mode core.Mode, styles style.Styles) string {
 	buf := w.Buffer
 
 	var flags []string
@@ -185,12 +198,13 @@ func leftBar(w *core.Window, mode core.Mode) string {
 		flagStr = "(" + strings.Join(flags, "") + ")"
 	}
 
-	return fmt.Sprintf(" %s  %s %s", mode.ToString(), buf.Filename, flagStr)
+	bar := fmt.Sprintf(" %s  %s %s", mode.ToString(), buf.Filename, flagStr)
+	return styles.LineStyle.Render(bar)
 }
 
 // rightBar: Returns the right side of the status bar showing cursor position
 // and selection count in visual mode.
-func rightBar(w *core.Window, mode core.Mode) (bar string) {
+func rightBar(w *core.Window, mode core.Mode, styles style.Styles) (bar string) {
 	if mode.IsVisualMode() {
 		lineCount := max(w.Anchor.Line, w.Cursor.Line) - min(w.Anchor.Line, w.Cursor.Line) + 1
 		bar = fmt.Sprintf("%d:%d  <%d>", w.Cursor.Line+1, w.Cursor.Col+1, lineCount)
@@ -198,41 +212,44 @@ func rightBar(w *core.Window, mode core.Mode) (bar string) {
 		bar = fmt.Sprintf("%d:%d ", w.Cursor.Line+1, w.Cursor.Col+1)
 	}
 	buf := w.Buffer
-	bar = fmt.Sprintf("%s %s", buf.Filetype, bar)
+	bar = styles.LineStyle.Render(fmt.Sprintf("%s %s", buf.Filetype, bar))
 	return
 }
 
 // drawCommandBar: Renders the command line showing command input, errors, or
 // output depending on the current mode and state.
 func drawCommandBar(m Model) string {
+	styles := m.Styles()
+
 	// Compute left bar (command side)
 	var leftBar string
 	if m.Mode() == core.CommandMode {
-		leftBar = ":"
+		leftBar = styles.LineStyle.Render(":")
 		cmd := []rune(m.Command())
 		cur := m.CommandCursor()
 		for i, r := range cmd {
 			if i == cur {
-				leftBar += m.Styles().CursorStyle(m.Mode()).Render(string(r))
+				leftBar += styles.DefaultCursorStyle(m.Mode()).Render(string(r))
 			} else {
-				leftBar += string(r)
+				leftBar += styles.LineStyle.Render(string(r))
 			}
 		}
 		// Cursor at end of command
 		if cur >= len(cmd) {
-			leftBar += m.Styles().CursorStyle(m.Mode()).Render(" ")
+			leftBar += styles.DefaultCursorStyle(m.Mode()).Render(" ")
 		}
 		// bar = fmt.Sprintf("%s  %d", bar, cur)
 	} else if out := m.CommandOutput(); out != nil && len(out.Lines) > 0 && out.Inline {
 		// TODO: This is not perfect, temporary
 		text := strings.Join(out.Lines, " ")
 		if out.IsError {
-			leftBar = m.Styles().CommandError.Render(text)
+			leftBar = styles.CommandError.Render(text)
 		} else {
-			leftBar = text
+			leftBar = styles.LineStyle.Render(text)
 		}
 	} else if strings.TrimSpace(m.Command()) != "" {
-		leftBar = fmt.Sprintf(":%s", m.Command())
+		content := fmt.Sprintf(":%s", m.Command())
+		leftBar = styles.LineStyle.Render(content) //
 	}
 
 	// Compute right bar
@@ -240,12 +257,13 @@ func drawCommandBar(m Model) string {
 	var rightBar string
 	if len(m.input.Pending()) > 0 {
 		width := 10 // Size of the block to display
-		rightBar = fmt.Sprintf("%-*s", width, m.input.Pending())
+		content := fmt.Sprintf("%-*s", width, m.input.Pending())
+		rightBar = styles.LineStyle.Render(content)
 	}
 
 	dif := m.termWidth - (lipgloss.Width(leftBar) + lipgloss.Width(rightBar))
 
-	bar := leftBar + strings.Repeat(" ", max(0, dif)) + rightBar
+	bar := leftBar + strings.Repeat(styles.BackgroundStyle.Render(" "), max(0, dif)) + rightBar
 	return bar
 }
 
@@ -310,10 +328,12 @@ func overlayCommandOutputWindow(view string, cmd *core.CommandOutput, styles sty
 	overlay = append(overlay, styles.CommandOutputBorder.Render(strings.Repeat(" ", termWidth)))
 
 	if strings.TrimSpace(cmd.Title) != "" {
-		overlay = append(overlay, cmd.Title)
+		title := styles.LineStyle.Render(cmd.Title)
+		overlay = append(overlay, title)
 	}
 	for _, l := range cmd.Lines {
-		overlay = append(overlay, strings.ReplaceAll(l, "\n", "\\n"))
+		content := styles.LineStyle.Render(strings.ReplaceAll(l, "\n", "\\n"))
+		overlay = append(overlay, content)
 	}
 	overlay = append(overlay, styles.CommandContinueMessage.Render(core.CommandOutputExitMessage))
 
@@ -321,6 +341,12 @@ func overlayCommandOutputWindow(view string, cmd *core.CommandOutput, styles sty
 	// which would cause Lipgloss to embed newlines internally and corrupt the line count.
 	// If block-level styles are ever added, this approach must be replaced.
 
+	// Add background color to end of each line
+	for i, l := range overlay {
+		dif := termWidth - lipgloss.Width(l)
+		overlay[i] += styles.BackgroundStyle.Render(strings.Repeat(" ", dif))
+	}
+
 	// Remove 'h' lines from back of view and append overlay
 	h := len(overlay)
 	final := lines[:max(0, len(lines)-h)]

internal/program/program_builder.go

@@ -46,6 +46,7 @@ func (p *ProgramBuilder) FileProgram(filename string) *ProgramBuilder {
 		WithType(core.FileBuffer).
 		WithFilename(filename).
 		WithFiletype(ext).
+		Listed().
 		Build()
 
 	win := core.NewWindowBuilder().

internal/style/style.go

@@ -2,6 +2,7 @@ package style
 
 import (
 	"git.gophernest.net/azpect/TextEditor/internal/core"
+	"github.com/alecthomas/chroma/v2"
 	"github.com/charmbracelet/lipgloss"
 )
 
@@ -28,9 +29,16 @@ type Styles struct {
 	CommandError           lipgloss.Style
 	CommandOutputBorder    lipgloss.Style
 	CommandContinueMessage lipgloss.Style
+
+	// General Styles
+	LineStyle       lipgloss.Style // This is a simple background with no text coloring
+	BackgroundStyle lipgloss.Style // This is just the background
+
+	// Chroma data
+	chromaStyle *chroma.Style
 }
 
-// DefaultStyles returns the default editor color scheme.
+// DefaultStyles: Returns the default editor color scheme.
 func DefaultStyles() Styles {
 	return Styles{
 		CursorNormal:  lipgloss.NewStyle().Reverse(true),
@@ -67,11 +75,86 @@ func DefaultStyles() Styles {
 
 		CommandContinueMessage: lipgloss.NewStyle().
 			Foreground(lipgloss.Color("#546fba")),
+
+		chromaStyle: nil,
 	}
 }
 
-// CursorStyle returns the appropriate cursor style for the given mode.
+func ChromaStyles(chromaStyle *chroma.Style) Styles {
-func (s Styles) CursorStyle(mode core.Mode) lipgloss.Style {
+	bgString := chromaStyle.Get(chroma.Background).Background.String()
+	lineNumbers := chromaStyle.Get(chroma.LineTableTD)
+	lineHighlight := chromaStyle.Get(chroma.LineHighlight)
+
+	return Styles{
+		CursorNormal: lipgloss.NewStyle().
+			Background(lipgloss.Color(bgString)).
+			Reverse(true),
+
+		CursorInsert: lipgloss.NewStyle().
+			Background(lipgloss.Color(bgString)).
+			Underline(true),
+
+		CursorCommand: lipgloss.NewStyle().
+			Background(lipgloss.Color(bgString)).
+			Reverse(true),
+
+		Gutter: lipgloss.NewStyle().
+			Background(lipgloss.Color(
+				darkenColor(lineNumbers.Background, 0.9).String()),
+			).
+			Foreground(lipgloss.Color(lineNumbers.Colour.String())),
+
+		GutterCurrentLine: lipgloss.NewStyle().
+			Background(lipgloss.Color(
+				darkenColor(lineNumbers.Background, 0.9).String()),
+			).
+			Foreground(lipgloss.Color(lineNumbers.Colour.String())),
+
+		VisualHighlight: lipgloss.NewStyle().
+			Background(lipgloss.Color(lineHighlight.Background.String())).
+			Foreground(lipgloss.Color(lineHighlight.Colour.String())),
+
+		VisualAnchor: lipgloss.NewStyle().
+			Background(lipgloss.Color(lineHighlight.Background.String())).
+			Foreground(lipgloss.Color(lineHighlight.Colour.String())),
+
+		StatusBar: lipgloss.NewStyle().
+			Background(lipgloss.Color(bgString)).
+			Foreground(lipgloss.Color("243")),
+
+		StatusBarActive: lipgloss.NewStyle().
+			Background(lipgloss.Color(bgString)).
+			Foreground(lipgloss.Color("230")),
+
+		CommandError: lipgloss.NewStyle().
+			Background(lipgloss.Color(bgString)).
+			Foreground(lipgloss.Color("#e3203a")),
+
+		CommandOutputBorder: lipgloss.NewStyle().
+			Background(
+				lipgloss.Color(
+					darkenColor(
+						chromaStyle.Get(chroma.Background).Background, 0.5).
+						String(),
+				),
+			),
+
+		CommandContinueMessage: lipgloss.NewStyle().
+			Background(lipgloss.Color(bgString)).
+			Foreground(lipgloss.Color("#546fba")),
+
+		LineStyle: lipgloss.NewStyle().
+			Foreground(lipgloss.Color(chromaStyle.Get(chroma.Line).Colour.String())).
+			Background(lipgloss.Color(bgString)),
+
+		BackgroundStyle: lipgloss.NewStyle().Background(lipgloss.Color(bgString)),
+
+		chromaStyle: chromaStyle,
+	}
+}
+
+// Styles.DefaultCursorStyle: Returns the appropriate cursor style for the given mode.
+func (s Styles) DefaultCursorStyle(mode core.Mode) lipgloss.Style {
 	switch mode {
 	case core.InsertMode:
 		return s.CursorInsert
@@ -81,3 +164,68 @@ func (s Styles) CursorStyle(mode core.Mode) lipgloss.Style {
 		return s.CursorNormal
 	}
 }
+
+// Styles.CursorStyle: Returns a cursor style derived from a chroma style. This function should preferred
+// over the DefaultCursorStyle, but in cases where there is no style to apply, the DefaultCursorStyle
+// will always work.
+func (s Styles) CursorStyle(mode core.Mode, style lipgloss.Style) lipgloss.Style {
+	switch mode {
+	case core.NormalMode, core.VisualLineMode, core.VisualBlockMode, core.VisualMode:
+		return lipgloss.NewStyle().
+			Background(style.GetForeground()).
+			Foreground(style.GetBackground())
+	default:
+		return lipgloss.NewStyle().
+			Background(s.BackgroundStyle.GetBackground()).
+			Foreground(style.GetForeground()).
+			Underline(true)
+	}
+}
+
+// Styles.VisualHighlightWithTextColor: Works analogously to CursorStyle vs DefaultCursorStyle. When a
+// style is available, this function should be used, so the text color will be rendered in front
+// of the background. Otherwise, the VisualHighlight property will always work.
+func (s Styles) VisualHighlightWithTextColor(style lipgloss.Style) lipgloss.Style {
+	return lipgloss.NewStyle().
+		Background(s.VisualHighlight.GetBackground()).
+		Foreground(style.GetForeground())
+}
+
+// Styles.MakeStyleMap: Generates a style map for a single line. A style map is a mapping from
+// column a lipgloss style. Cursor styles are not handled by this map, but they can be derived
+// by inverting the background and foreground (and rolling back to the default).
+func (s Styles) MakeStyleMap(lexer chroma.Lexer, line string) []lipgloss.Style {
+	m := make([]lipgloss.Style, len(line))
+
+	iter, err := lexer.Tokenise(nil, line)
+	if err != nil {
+		panic(err)
+	}
+
+	col := 0
+	for _, token := range iter.Tokens() {
+		entry := s.chromaStyle.Get(token.Type)
+		s := lipgloss.NewStyle().
+			Background(lipgloss.Color(entry.Background.String())).
+			Foreground(lipgloss.Color(entry.Colour.String()))
+		for _, char := range token.Value {
+			if char == '\n' {
+				continue
+			}
+			if col < len(m) {
+				m[col] = s
+			}
+			col++
+		}
+	}
+
+	return m
+}
+
+// darkenColor: Uses a factor (0.0 to 1.0) to darken a color using its opacity.
+func darkenColor(c chroma.Colour, factor float64) chroma.Colour {
+	r := uint8(float64(c.Red()) * factor)
+	g := uint8(float64(c.Green()) * factor)
+	b := uint8(float64(c.Blue()) * factor)
+	return chroma.NewColour(r, g, b)
+}

internal/theme/theme.go

@@ -0,0 +1,43 @@
+package theme
+
+import (
+	"embed"
+	"fmt"
+
+	"github.com/alecthomas/chroma/v2"
+	"github.com/alecthomas/chroma/v2/styles"
+)
+
+//go:embed themes/*
+var themeFS embed.FS
+
+// RegisterAll: Registers all XML theme files embedded in the themes/ directory
+// with chroma's style registry. After calling this, styles.Get() will recognize
+// any theme defined in those files.
+func RegisterAll() error {
+	entries, err := themeFS.ReadDir("themes")
+	if err != nil {
+		return fmt.Errorf("failed to read embedded themes directory: %w", err)
+	}
+
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+
+		f, err := themeFS.Open("themes/" + entry.Name())
+		if err != nil {
+			return fmt.Errorf("failed to open theme %s: %w", entry.Name(), err)
+		}
+
+		style, err := chroma.NewXMLStyle(f)
+		f.Close()
+		if err != nil {
+			return fmt.Errorf("failed to parse theme %s: %w", entry.Name(), err)
+		}
+
+		styles.Register(style)
+	}
+
+	return nil
+}

internal/theme/themes/kanagawa-dragon.xml

@@ -0,0 +1,83 @@
+<style name="kanagawa-dragon">
+  <entry type="Background" style="bg:#181616 #c5c9c5" />
+  <entry type="CodeLine" style="#c5c9c5" />
+  <entry type="Error" style="#e82424" />
+  <entry type="Other" style="#c5c9c5" />
+  <entry type="LineTableTD" style="" />
+  <entry type="LineTable" style="" />
+  <entry type="LineHighlight" style="bg:#393836" />
+  <entry type="LineNumbersTable" style="#625e5a" />
+  <entry type="LineNumbers" style="#625e5a" />
+  <entry type="Keyword" style="#8992a7" />
+  <entry type="KeywordReserved" style="#8992a7" />
+  <entry type="KeywordPseudo" style="#8992a7" />
+  <entry type="KeywordConstant" style="#b6927b" />
+  <entry type="KeywordDeclaration" style="#8992a7" />
+  <entry type="KeywordNamespace" style="#c4b28a" />
+  <entry type="KeywordType" style="#8ea4a2" />
+  <entry type="Name" style="#c5c9c5" />
+  <entry type="NameClass" style="#8ea4a2" />
+  <entry type="NameConstant" style="#b6927b" />
+  <entry type="NameDecorator" style="bold #b6927b" />
+  <entry type="NameEntity" style="#c4b28a" />
+  <entry type="NameException" style="#b6927b" />
+  <entry type="NameFunction" style="#8ba4b0" />
+  <entry type="NameFunctionMagic" style="#8ba4b0" />
+  <entry type="NameLabel" style="#949fb5" />
+  <entry type="NameNamespace" style="#c4b28a" />
+  <entry type="NameProperty" style="#c4b28a" />
+  <entry type="NameTag" style="#8ba4b0" />
+  <entry type="NameVariable" style="#c5c9c5" />
+  <entry type="NameVariableClass" style="#c5c9c5" />
+  <entry type="NameVariableGlobal" style="#c5c9c5" />
+  <entry type="NameVariableInstance" style="#c5c9c5" />
+  <entry type="NameVariableMagic" style="#c5c9c5" />
+  <entry type="NameAttribute" style="#c4b28a" />
+  <entry type="NameBuiltin" style="#c4746e" />
+  <entry type="NameBuiltinPseudo" style="#c4746e" />
+  <entry type="NameOther" style="#c5c9c5" />
+  <entry type="Literal" style="#c5c9c5" />
+  <entry type="LiteralDate" style="#c5c9c5" />
+  <entry type="LiteralString" style="#8a9a7b" />
+  <entry type="LiteralStringChar" style="#8a9a7b" />
+  <entry type="LiteralStringSingle" style="#8a9a7b" />
+  <entry type="LiteralStringDouble" style="#8a9a7b" />
+  <entry type="LiteralStringBacktick" style="#8a9a7b" />
+  <entry type="LiteralStringOther" style="#8a9a7b" />
+  <entry type="LiteralStringSymbol" style="#8a9a7b" />
+  <entry type="LiteralStringInterpol" style="#949fb5" />
+  <entry type="LiteralStringAffix" style="#c4746e" />
+  <entry type="LiteralStringDelimiter" style="#949fb5" />
+  <entry type="LiteralStringEscape" style="#c4746e" />
+  <entry type="LiteralStringRegex" style="#c4746e" />
+  <entry type="LiteralStringDoc" style="#737c73" />
+  <entry type="LiteralStringHeredoc" style="#737c73" />
+  <entry type="LiteralNumber" style="#a292a3" />
+  <entry type="LiteralNumberBin" style="#a292a3" />
+  <entry type="LiteralNumberHex" style="#a292a3" />
+  <entry type="LiteralNumberInteger" style="#a292a3" />
+  <entry type="LiteralNumberFloat" style="#a292a3" />
+  <entry type="LiteralNumberIntegerLong" style="#a292a3" />
+  <entry type="LiteralNumberOct" style="#a292a3" />
+  <entry type="Operator" style="bold #c4746e" />
+  <entry type="OperatorWord" style="bold #c4746e" />
+  <entry type="Comment" style="italic #737c73" />
+  <entry type="CommentSingle" style="italic #737c73" />
+  <entry type="CommentMultiline" style="italic #737c73" />
+  <entry type="CommentSpecial" style="italic #737c73" />
+  <entry type="CommentHashbang" style="italic #737c73" />
+  <entry type="CommentPreproc" style="italic #c4746e" />
+  <entry type="CommentPreprocFile" style="bold #c4746e" />
+  <entry type="Generic" style="#c5c9c5" />
+  <entry type="GenericInserted" style="bg:#2b3328 #76946a" />
+  <entry type="GenericDeleted" style="bg:#43242b #c34043" />
+  <entry type="GenericEmph" style="italic #c5c9c5" />
+  <entry type="GenericStrong" style="bold #c5c9c5" />
+  <entry type="GenericUnderline" style="underline #c5c9c5" />
+  <entry type="GenericHeading" style="bold #8ba4b0" />
+  <entry type="GenericSubheading" style="bold #8ba4b0" />
+  <entry type="GenericOutput" style="#c5c9c5" />
+  <entry type="GenericPrompt" style="#c5c9c5" />
+  <entry type="GenericError" style="#e82424" />
+  <entry type="GenericTraceback" style="#e82424" />
+</style>

internal/theme/themes/kanagawa-lotus.xml

@@ -0,0 +1,83 @@
+<style name="kanagawa-lotus">
+  <entry type="Background" style="bg:#f2ecbc #545464" />
+  <entry type="CodeLine" style="#545464" />
+  <entry type="Error" style="#e82424" />
+  <entry type="Other" style="#545464" />
+  <entry type="LineTableTD" style="" />
+  <entry type="LineTable" style="" />
+  <entry type="LineHighlight" style="bg:#e4d794" />
+  <entry type="LineNumbersTable" style="#a09cac" />
+  <entry type="LineNumbers" style="#a09cac" />
+  <entry type="Keyword" style="#624c83" />
+  <entry type="KeywordReserved" style="#624c83" />
+  <entry type="KeywordPseudo" style="#624c83" />
+  <entry type="KeywordConstant" style="#cc6d00" />
+  <entry type="KeywordDeclaration" style="#624c83" />
+  <entry type="KeywordNamespace" style="#77713f" />
+  <entry type="KeywordType" style="#597b75" />
+  <entry type="Name" style="#545464" />
+  <entry type="NameClass" style="#597b75" />
+  <entry type="NameConstant" style="#cc6d00" />
+  <entry type="NameDecorator" style="bold #cc6d00" />
+  <entry type="NameEntity" style="#77713f" />
+  <entry type="NameException" style="#cc6d00" />
+  <entry type="NameFunction" style="#4d699b" />
+  <entry type="NameFunctionMagic" style="#4d699b" />
+  <entry type="NameLabel" style="#6693bf" />
+  <entry type="NameNamespace" style="#77713f" />
+  <entry type="NameProperty" style="#77713f" />
+  <entry type="NameTag" style="#4d699b" />
+  <entry type="NameVariable" style="#545464" />
+  <entry type="NameVariableClass" style="#545464" />
+  <entry type="NameVariableGlobal" style="#545464" />
+  <entry type="NameVariableInstance" style="#545464" />
+  <entry type="NameVariableMagic" style="#545464" />
+  <entry type="NameAttribute" style="#77713f" />
+  <entry type="NameBuiltin" style="#c84053" />
+  <entry type="NameBuiltinPseudo" style="#c84053" />
+  <entry type="NameOther" style="#545464" />
+  <entry type="Literal" style="#545464" />
+  <entry type="LiteralDate" style="#545464" />
+  <entry type="LiteralString" style="#6f894e" />
+  <entry type="LiteralStringChar" style="#6f894e" />
+  <entry type="LiteralStringSingle" style="#6f894e" />
+  <entry type="LiteralStringDouble" style="#6f894e" />
+  <entry type="LiteralStringBacktick" style="#6f894e" />
+  <entry type="LiteralStringOther" style="#6f894e" />
+  <entry type="LiteralStringSymbol" style="#6f894e" />
+  <entry type="LiteralStringInterpol" style="#6693bf" />
+  <entry type="LiteralStringAffix" style="#c84053" />
+  <entry type="LiteralStringDelimiter" style="#6693bf" />
+  <entry type="LiteralStringEscape" style="#836f4a" />
+  <entry type="LiteralStringRegex" style="#836f4a" />
+  <entry type="LiteralStringDoc" style="#8a8980" />
+  <entry type="LiteralStringHeredoc" style="#8a8980" />
+  <entry type="LiteralNumber" style="#b35b79" />
+  <entry type="LiteralNumberBin" style="#b35b79" />
+  <entry type="LiteralNumberHex" style="#b35b79" />
+  <entry type="LiteralNumberInteger" style="#b35b79" />
+  <entry type="LiteralNumberFloat" style="#b35b79" />
+  <entry type="LiteralNumberIntegerLong" style="#b35b79" />
+  <entry type="LiteralNumberOct" style="#b35b79" />
+  <entry type="Operator" style="bold #836f4a" />
+  <entry type="OperatorWord" style="bold #836f4a" />
+  <entry type="Comment" style="italic #8a8980" />
+  <entry type="CommentSingle" style="italic #8a8980" />
+  <entry type="CommentMultiline" style="italic #8a8980" />
+  <entry type="CommentSpecial" style="italic #8a8980" />
+  <entry type="CommentHashbang" style="italic #8a8980" />
+  <entry type="CommentPreproc" style="italic #c84053" />
+  <entry type="CommentPreprocFile" style="bold #c84053" />
+  <entry type="Generic" style="#545464" />
+  <entry type="GenericInserted" style="bg:#b7d0ae #6e915f" />
+  <entry type="GenericDeleted" style="bg:#d9a594 #d7474b" />
+  <entry type="GenericEmph" style="italic #545464" />
+  <entry type="GenericStrong" style="bold #545464" />
+  <entry type="GenericUnderline" style="underline #545464" />
+  <entry type="GenericHeading" style="bold #4d699b" />
+  <entry type="GenericSubheading" style="bold #4d699b" />
+  <entry type="GenericOutput" style="#545464" />
+  <entry type="GenericPrompt" style="#545464" />
+  <entry type="GenericError" style="#e82424" />
+  <entry type="GenericTraceback" style="#e82424" />
+</style>

internal/theme/themes/kanagawa-wave.xml

@@ -0,0 +1,83 @@
+<style name="kanagawa-wave">
+  <entry type="Background" style="bg:#1f1f28 #dcd7ba" />
+  <entry type="CodeLine" style="#dcd7ba" />
+  <entry type="Error" style="#e82424" />
+  <entry type="Other" style="#dcd7ba" />
+  <entry type="LineTableTD" style="" />
+  <entry type="LineTable" style="" />
+  <entry type="LineHighlight" style="bg:#363646" />
+  <entry type="LineNumbersTable" style="#54546d" />
+  <entry type="LineNumbers" style="#54546d" />
+  <entry type="Keyword" style="#957fb8" />
+  <entry type="KeywordReserved" style="#957fb8" />
+  <entry type="KeywordPseudo" style="#957fb8" />
+  <entry type="KeywordConstant" style="#ffa066" />
+  <entry type="KeywordDeclaration" style="#957fb8" />
+  <entry type="KeywordNamespace" style="#e6c384" />
+  <entry type="KeywordType" style="#7aa89f" />
+  <entry type="Name" style="#dcd7ba" />
+  <entry type="NameClass" style="#7aa89f" />
+  <entry type="NameConstant" style="#ffa066" />
+  <entry type="NameDecorator" style="bold #ffa066" />
+  <entry type="NameEntity" style="#e6c384" />
+  <entry type="NameException" style="#ffa066" />
+  <entry type="NameFunction" style="#7e9cd8" />
+  <entry type="NameFunctionMagic" style="#7e9cd8" />
+  <entry type="NameLabel" style="#7fb4ca" />
+  <entry type="NameNamespace" style="#e6c384" />
+  <entry type="NameProperty" style="#e6c384" />
+  <entry type="NameTag" style="#7e9cd8" />
+  <entry type="NameVariable" style="#dcd7ba" />
+  <entry type="NameVariableClass" style="#dcd7ba" />
+  <entry type="NameVariableGlobal" style="#dcd7ba" />
+  <entry type="NameVariableInstance" style="#dcd7ba" />
+  <entry type="NameVariableMagic" style="#dcd7ba" />
+  <entry type="NameAttribute" style="#e6c384" />
+  <entry type="NameBuiltin" style="#e46876" />
+  <entry type="NameBuiltinPseudo" style="#e46876" />
+  <entry type="NameOther" style="#dcd7ba" />
+  <entry type="Literal" style="#dcd7ba" />
+  <entry type="LiteralDate" style="#dcd7ba" />
+  <entry type="LiteralString" style="#98bb6c" />
+  <entry type="LiteralStringChar" style="#98bb6c" />
+  <entry type="LiteralStringSingle" style="#98bb6c" />
+  <entry type="LiteralStringDouble" style="#98bb6c" />
+  <entry type="LiteralStringBacktick" style="#98bb6c" />
+  <entry type="LiteralStringOther" style="#98bb6c" />
+  <entry type="LiteralStringSymbol" style="#98bb6c" />
+  <entry type="LiteralStringInterpol" style="#7fb4ca" />
+  <entry type="LiteralStringAffix" style="#ff5d62" />
+  <entry type="LiteralStringDelimiter" style="#7fb4ca" />
+  <entry type="LiteralStringEscape" style="#c0a36e" />
+  <entry type="LiteralStringRegex" style="#c0a36e" />
+  <entry type="LiteralStringDoc" style="#727169" />
+  <entry type="LiteralStringHeredoc" style="#727169" />
+  <entry type="LiteralNumber" style="#d27e99" />
+  <entry type="LiteralNumberBin" style="#d27e99" />
+  <entry type="LiteralNumberHex" style="#d27e99" />
+  <entry type="LiteralNumberInteger" style="#d27e99" />
+  <entry type="LiteralNumberFloat" style="#d27e99" />
+  <entry type="LiteralNumberIntegerLong" style="#d27e99" />
+  <entry type="LiteralNumberOct" style="#d27e99" />
+  <entry type="Operator" style="bold #c0a36e" />
+  <entry type="OperatorWord" style="bold #c0a36e" />
+  <entry type="Comment" style="italic #727169" />
+  <entry type="CommentSingle" style="italic #727169" />
+  <entry type="CommentMultiline" style="italic #727169" />
+  <entry type="CommentSpecial" style="italic #727169" />
+  <entry type="CommentHashbang" style="italic #727169" />
+  <entry type="CommentPreproc" style="italic #e46876" />
+  <entry type="CommentPreprocFile" style="bold #e46876" />
+  <entry type="Generic" style="#dcd7ba" />
+  <entry type="GenericInserted" style="bg:#2b3328 #76946a" />
+  <entry type="GenericDeleted" style="bg:#43242b #c34043" />
+  <entry type="GenericEmph" style="italic #dcd7ba" />
+  <entry type="GenericStrong" style="bold #dcd7ba" />
+  <entry type="GenericUnderline" style="underline #dcd7ba" />
+  <entry type="GenericHeading" style="bold #7e9cd8" />
+  <entry type="GenericSubheading" style="bold #7e9cd8" />
+  <entry type="GenericOutput" style="#dcd7ba" />
+  <entry type="GenericPrompt" style="#dcd7ba" />
+  <entry type="GenericError" style="#e82424" />
+  <entry type="GenericTraceback" style="#e82424" />
+</style>