Code

2026-05-20 16:02:46 +02:00
commit c5fb1169b0
5 changed files with 266 additions and 0 deletions
@@ -0,0 +1,114 @@
+package main
+
+import(
+	"fmt"
+	"os"
+	"io"
+	"strings"
+	"strconv"
+	p "github.com/mcecode/gemtext-parser"
+)
+
+type State struct {
+	out io.Writer	
+	maxLineLength int
+	isInCodeBlock bool
+	wasPreviousLink bool
+}
+
+func main() {
+	if len(os.Args) < 3 {
+		fmt.Printf("Usage: %s input.gmi output_gophermap [max line length (default 69)]\n", os.Args[0])
+		return
+	}
+
+	var asl p.ASL
+	var err error
+	if os.Args[1] != "-" {
+		asl, err = p.ParseFile(os.Args[1])
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			return
+		}
+	} else {
+		stdin, err := io.ReadAll(os.Stdin)
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			return
+		}
+		asl = p.Parse(string(stdin))
+	}
+
+	var outputWriter io.Writer
+	if os.Args[2] != "-" {
+		file, err := os.Create(os.Args[2])
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			return
+		}
+		defer file.Close()
+		outputWriter = file
+	} else {
+		outputWriter = os.Stdout
+	}
+
+	s := State{outputWriter, 69, false, false}
+	if len(os.Args) >= 4 {
+		maxLineLength, err := strconv.Atoi(os.Args[3])
+		if err != nil {
+			fmt.Fprintln(os.Stderr, err)
+			return
+		}
+		s.maxLineLength = maxLineLength
+	}
+
+	asl.Visit(s.handleElement)
+}
+
+var gopherTypeCharParams = GopherTypeCharParams{
+	GophermapFiles: []string{"gophermap"},
+	GophermapExtensions: []string{},
+	PromptFileExtensions: []string{},
+}
+
+func (s *State) handleElement(e p.Element) {
+	switch (e.Type()) {
+		case p.ElementTypes.Text():
+			if e.Text() == "" { return }
+			if !s.isInCodeBlock { s.out.Write([]byte("\n")) }
+			s.out.Write([]byte(JoinGophermapLines("i", WrapLines(e.Text(), s.maxLineLength, " "), "\t/FAKE\tNULL\t0")))
+			s.wasPreviousLink = false
+		case p.ElementTypes.Link():
+			if !s.wasPreviousLink {
+				s.out.Write([]byte("\n"))
+			}
+			isUrl := strings.Contains(e.URL(), "://")
+			linkPrefix := ""
+			if isUrl {
+				linkPrefix = "URL:"
+			}
+			typeChar := gopherTypeCharParams.GopherTypeChar(e.URL(), strings.HasSuffix(e.URL(), "/"))
+			s.out.Write([]byte(typeChar + e.Text() + "\t" + linkPrefix + e.URL()))
+			s.wasPreviousLink = true
+		case p.ElementTypes.Heading():
+			s.out.Write([]byte("\n"))
+			if e.Level() == p.HeadingLevels.Heading() || e.Level() == p.HeadingLevels.SubHeading() {
+				s.out.Write([]byte("\n\n"))
+			}
+			if e.Level() == p.HeadingLevels.SubSubHeading() {
+				s.out.Write([]byte("\n"))
+			}
+			s.out.Write([]byte(JoinGophermapLines("i", WrapLines(e.Text(), s.maxLineLength, " "), "\t/FAKE\tNULL\t0")))
+			s.wasPreviousLink = false
+		case p.ElementTypes.List():
+			s.out.Write([]byte(JoinGophermapLines("i- ", WrapLines(e.Text(), s.maxLineLength - 2, " "), "\t/FAKE\tNULL\t0")))
+			s.wasPreviousLink = false
+		case p.ElementTypes.Quote():
+			s.out.Write([]byte(JoinGophermapLines("i> ", WrapLines(e.Text(), s.maxLineLength - 2, " "), "\t/FAKE\tNULL\t0")))
+			s.wasPreviousLink = false
+		case p.ElementTypes.PreformatToggle():
+			s.isInCodeBlock = !s.isInCodeBlock
+			s.wasPreviousLink = false
+	}
+	s.out.Write([]byte("\n"))
+}