From bb16c9ca9f7a1c51d5a60f7ac1e22f034b33377b Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Mon, 21 Dec 2020 17:53:47 -0500
Subject: [PATCH] Handle blank schemes when parrsing link URLs

---
 GeminiFormat/GeminiParser.swift | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/GeminiFormat/GeminiParser.swift b/GeminiFormat/GeminiParser.swift
index 41167e4..df169ed 100644
--- a/GeminiFormat/GeminiParser.swift
+++ b/GeminiFormat/GeminiParser.swift
@@ -39,7 +39,11 @@ public struct GeminiParser {
                 let urlEnd = line.firstWhitespaceIndex(after: urlStart)
                 let textStart = line.firstNonWhitespaceIndex(after: urlEnd)
                 
-                let urlString = String(line[urlStart..<urlEnd])
+                var urlString = String(line[urlStart..<urlEnd])
+                if urlString.hasPrefix("//") {
+                    // URL(string:relativeTo:) does not handle // meaning the same protocol as the base URL
+                    urlString = baseURL.scheme! + ":" + urlString
+                }
                 // todo: if the URL initializer fails, should there be a .link line with a nil URL?
                 let url = URL(string: urlString, relativeTo: baseURL)!.absoluteURL