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https://git.sr.ht/~adnano/kiln
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Add GeminiToHTML renderer
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parent
82a5490ff5
commit
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89
render.go
Normal file
89
render.go
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package main
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import (
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"bufio"
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"io"
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"strings"
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)
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// GeminiToHTML reads Gemini from the provided reader and returns an HTML string.
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func GeminiToHTML(r io.Reader) string {
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const spacetab = " \t"
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type parseCtx int
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const (
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parseCtxNone = iota
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parseCtxPre
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parseCtxList
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)
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var builder strings.Builder
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var ctx parseCtx
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scanner := bufio.NewScanner(r)
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for scanner.Scan() {
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line := scanner.Text()
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if len(line) == 0 {
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continue
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}
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if strings.HasPrefix(line, "```") {
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if ctx != parseCtxPre {
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builder.WriteString("<pre>\n")
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ctx = parseCtxPre
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} else {
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builder.WriteString("</pre>\n")
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ctx = parseCtxNone
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}
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} else if ctx == parseCtxPre {
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builder.WriteString(line)
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builder.WriteString("\n")
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} else if strings.HasPrefix(line, "*") {
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if ctx != parseCtxList {
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builder.WriteString("<ul>\n")
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ctx = parseCtxList
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}
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builder.WriteString("<li>")
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line = line[1:]
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builder.WriteString(strings.TrimLeft(line, spacetab))
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builder.WriteString("</li>\n")
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} else if ctx == parseCtxList {
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builder.WriteString("</ul>\n")
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ctx = parseCtxNone
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} else if strings.HasPrefix(line, "###") {
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line = line[3:]
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line = strings.TrimLeft(line, spacetab)
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builder.WriteString("<h3>" + line + "</h3>\n")
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} else if strings.HasPrefix(line, "##") {
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line = line[2:]
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line = strings.TrimLeft(line, spacetab)
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builder.WriteString("<h2>" + line + "</h2>\n")
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} else if strings.HasPrefix(line, "#") {
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line = line[1:]
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line = strings.TrimLeft(line, spacetab)
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builder.WriteString("<h1>" + line + "</h1>\n")
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} else if strings.HasPrefix(line, "=>") {
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line = line[2:]
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line = strings.TrimLeft(line, spacetab)
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split := strings.IndexAny(line, spacetab)
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url := line[:split]
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name := line[split:]
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name = strings.TrimLeft(name, spacetab)
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builder.WriteString("<p><a href='" + url + "'>" + name + "</a></p>\n")
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} else if strings.HasPrefix(line, ">") {
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builder.WriteString("<blockquote>" + line + "</blockquote>")
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} else {
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builder.WriteString("<p>" + line + "</p>\n")
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}
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}
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// Close any opened tags
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switch ctx {
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case parseCtxPre:
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builder.WriteString("</pre>\n")
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case parseCtxList:
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builder.WriteString("</ul>\n")
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}
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return builder.String()
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}
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