From 3ff04cf88571f8ed1aca78da4efe4929ad583ca6 Mon Sep 17 00:00:00 2001
From: tjpcc <tjp@ctrl-c.club>
Date: Sat, 29 Apr 2023 18:10:50 -0600
Subject: spartan =: prompt line support in gemtext

---
 gemini/gemtext/parse_line.go | 43 +++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 41 insertions(+), 2 deletions(-)

(limited to 'gemini/gemtext/parse_line.go')

diff --git a/gemini/gemtext/parse_line.go b/gemini/gemtext/parse_line.go
index 39187a8..e31e5b6 100644
--- a/gemini/gemtext/parse_line.go
+++ b/gemini/gemtext/parse_line.go
@@ -10,10 +10,16 @@ func ParseLine(line []byte) Line {
 
 	switch line[0] {
 	case '=':
-		if len(line) == 1 || line[1] != '>' {
+		if len(line) == 1 {
 			break
 		}
-		return parseLinkLine(line)
+		if line[1] == '>' {
+			return parseLinkLine(line)
+		}
+		if line[1] == ':' {
+			return parsePromptLine(line)
+		}
+		break
 	case '`':
 		if len(line) < 3 || line[1] != '`' || line[2] != '`' {
 			break
@@ -73,6 +79,39 @@ func parseLinkLine(raw []byte) LinkLine {
 	return line
 }
 
+func parsePromptLine(raw []byte) PromptLine {
+	line := PromptLine{raw: raw}
+
+	// move past =:[<whitespace>]
+	raw = bytes.TrimLeft(raw[2:], " \t")
+
+	// find the next space or tab
+	spIdx := bytes.IndexByte(raw, ' ')
+	tbIdx := bytes.IndexByte(raw, '\t')
+	idx := spIdx
+	if idx == -1 {
+		idx = tbIdx
+	}
+	if tbIdx >= 0 && tbIdx < idx {
+		idx = tbIdx
+	}
+
+	if idx < 0 {
+		line.url = bytes.TrimRight(raw, "\r\n")
+		return line
+	}
+
+	line.url = raw[:idx]
+	raw = raw[idx+1:]
+
+	label := bytes.TrimRight(bytes.TrimLeft(raw, " \t"), "\r\n")
+	if len(label) > 0 {
+		line.label = label
+	}
+
+	return line
+}
+
 func parsePreformatToggleLine(raw []byte) PreformatToggleLine {
 	line := PreformatToggleLine{raw: raw}
 
-- 
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