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package cms
import (
"regexp"
"strings"
)
var (
standaloneMarkdownLink = regexp.MustCompile(`^\s*\[([^\]]+)\]\(([^)]+)\)\s*$`)
inlineMarkdownLink = regexp.MustCompile(`\[([^\]]+)\]\(([^)]+)\)`)
)
func markdownToGemtext(body string) string {
var out []string
inFence := false
for _, line := range strings.Split(strings.ReplaceAll(body, "\r\n", "\n"), "\n") {
trimmed := strings.TrimSpace(line)
if strings.HasPrefix(trimmed, "```") {
inFence = !inFence
out = append(out, line)
continue
}
if inFence {
out = append(out, line)
continue
}
if match := standaloneMarkdownLink.FindStringSubmatch(line); match != nil {
out = append(out, "=> "+match[2]+" "+match[1])
continue
}
if strings.HasPrefix(trimmed, "- ") {
indent := line[:strings.Index(line, "-")]
line = indent + "* " + strings.TrimPrefix(trimmed, "- ")
}
line = inlineMarkdownLink.ReplaceAllString(line, "$1 ($2)")
line = strings.ReplaceAll(line, "**", "")
line = strings.ReplaceAll(line, "__", "")
out = append(out, line)
}
return strings.TrimRight(strings.Join(out, "\n"), "\n") + "\n"
}
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