Implement markup to HTML conversion

The new custom and text/gemini inspired markup has to be converted to
HTML to display the recipe.

1 files changed, 73 insertions, 6 deletions

diff --git a/markup.go b/markup.go
index c0a6d45..7170bd8 100644
--- a/markup.go
+++ b/markup.go
@@ -2,17 +2,84 @@ package main
 
 import (
 	"bufio"
+	"fmt"
 	"strings"
 )
 
-func titleFromMarkup(markup string) string {
-	scanner := bufio.NewScanner(strings.NewReader(markup))
+type Markup []byte
+type LineType int8
+
+const (
+	TextLine LineType = iota
+	LinkLine
+	HeadingLine
+	UnorderedListItem
+)
+
+func getLineType(line string) LineType {
+	if strings.HasPrefix(line, "=>") {
+		return LinkLine
+	}
+	if strings.HasPrefix(line, "#") {
+		return HeadingLine
+	}
+	if strings.HasPrefix(line, "* ") {
+		return UnorderedListItem
+	}
+	return TextLine
+}
+
+func (m Markup) title() string {
+	text := string(m)
+	scanner := bufio.NewScanner(strings.NewReader(text))
 	for scanner.Scan() {
 		line := scanner.Text()
-		cut, found := strings.CutPrefix(line, "# ")
-		if found {
-			return cut
+		if strings.HasPrefix(line, "# ") {
+			return strings.TrimPrefix(line, "# ")
+		}
+	}
+	return ""
+}
+
+func (m Markup) html() string {
+	retval := ""
+	var line string
+	var lineType LineType
+	var lastType LineType = -1
+
+	text := string(m)
+	scanner := bufio.NewScanner(strings.NewReader(text))
+	for scanner.Scan() {
+		line = scanner.Text()
+		lineType = getLineType(line)
+		if lineType != UnorderedListItem && lastType == UnorderedListItem {
+			retval += "\n</ul>"
+		}
+		if line == "" {
+			continue
 		}
+		switch lineType {
+		case LinkLine:
+			retval += fmt.Sprintf("\n<pre>%s</pre>", line)
+		case HeadingLine:
+			retval += fmt.Sprintf("\n<h3>%s</h3>", line)
+		case UnorderedListItem:
+			if lastType != UnorderedListItem {
+				retval += "\n<ul>"
+			}
+			item := strings.TrimPrefix(line, "*")
+			retval += fmt.Sprintf("\n\t<li>%s</li>", item)
+		default:
+			retval += fmt.Sprintf("\n<p>%s</p>", line)
+		}
+		lastType = lineType
+	}
+
+	if lineType == UnorderedListItem {
+		retval += "\n</ul>"
 	}
-	return "no title detected"
+
+	retval = strings.TrimPrefix(retval, "\n")
+
+	return retval
 }