feat: png support with rsvg-convert

error.go

@@ -7,13 +7,12 @@ import (
 	"github.com/charmbracelet/lipgloss"
 )
 
-var ErrorPadding = lipgloss.NewStyle().Padding(1, 2)
-var ErrorHeader = lipgloss.NewStyle().Foreground(lipgloss.Color("#F1F1F1")).Background(lipgloss.Color("#FF5F87")).Bold(true).Padding(0, 1).SetString("ERROR")
-var ErrorDetails = lipgloss.NewStyle().Foreground(lipgloss.Color("#757575"))
+var ErrorHeader = lipgloss.NewStyle().Foreground(lipgloss.Color("#F1F1F1")).Background(lipgloss.Color("#FF5F87")).Bold(true).Padding(0, 1).Margin(1).MarginLeft(2).SetString("ERROR")
+var ErrorDetails = lipgloss.NewStyle().Foreground(lipgloss.Color("#757575")).Margin(0, 0, 1, 2)
 
 func printError(title string, err error) {
-	fmt.Printf("%s", ErrorPadding.Render(ErrorHeader.String(), title))
-	fmt.Printf("%s\n", ErrorPadding.Render(ErrorDetails.Render(err.Error())))
+	fmt.Printf("%s\n", lipgloss.JoinHorizontal(lipgloss.Center, ErrorHeader.String(), title))
+	fmt.Printf("%s\n", ErrorDetails.Render(err.Error()))
 }
 
 func printErrorFatal(title string, err error) {

main.go

@@ -5,6 +5,8 @@ import (
 	"errors"
 	"fmt"
 	"os"
+	"os/exec"
+	"strconv"
 	"strings"
 
 	"github.com/alecthomas/chroma"
@@ -19,6 +21,8 @@ import (
 	"github.com/mattn/go-isatty"
 )
 
+const pngExportMultiplier = 3
+
 func main() {
 	var (
 		input  string
@@ -190,6 +194,26 @@ func main() {
 
 	switch {
 	case strings.HasSuffix(config.Output, ".png"):
+		_, err := exec.LookPath("rsvg-conver")
+		if err != nil {
+			printErrorFatal("PNG convert failure", fmt.Errorf("rsvg-convert required to convert to png, install librsvg."))
+		}
+		rsvgConvert := exec.Command("rsvg-convert",
+			"--width", strconv.Itoa(w*pngExportMultiplier),
+			"--keep-aspect-ratio",
+			"-f", "png",
+			"-o", config.Output,
+		)
+		svg, err := doc.WriteToString()
+		if err != nil {
+			printErrorFatal("Unable to write output", err)
+		}
+		rsvgConvert.Stdin = strings.NewReader(svg)
+		err = rsvgConvert.Run()
+		if err != nil {
+			printErrorFatal("Unable to write output", err)
+		}
+
 	case strings.HasSuffix(config.Output, ".svg"):
 		if istty {
 			err = doc.WriteToFile(config.Output)

svg/svg.go

@@ -14,6 +14,7 @@ func AddShadow(element *etree.Element, id string, x, y, blur int) {
 	f.CreateAttr("id", id)
 	f.CreateAttr("x", "0")
 	f.CreateAttr("y", "0")
+	f.CreateAttr("filterUnits", "userSpaceOnUse")
 
 	o := etree.NewElement("feOffset")
 	o.CreateAttr("result", "offOut")