From fd385801d115e8a0aa29ffb9b9e6ff215c34cc42 Mon Sep 17 00:00:00 2001
From: Linnnus <linnnus@users.noreply.github.com>
Date: Sat, 17 Feb 2024 02:41:43 +0100
Subject: fix(creole): Handle escapes properly

A faulty boolean expression was to blame.

This patch also adds the necessary tests to prevent relapses (i forgot
det technical term).
---
 src/creole.c           |  4 +++-
 src/creole_test_main.c | 20 ++++++++++++++++++++
 2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/src/creole.c b/src/creole.c
index 5804ebd..94e8020 100644
--- a/src/creole.c
+++ b/src/creole.c
@@ -116,6 +116,8 @@ static struct {
 	// Escaped special characters
 	{"~[[", "[["},
 	{"~]]", "]]"}, // NOTE: This pattern is duplicated in do_link().
+	{"~//", "//"},
+	{"~**", "**"},
 	// Characters that have special meaning in HTML
 	// NOTE: These rules are duplicated in hprint().
 	{"<", "&lt;"},
@@ -256,7 +258,7 @@ long do_emphasis(const char *begin, const char *end, bool new_block, FILE *out)
 	const char *stop = start;
 	do {
 		stop = strnstr(stop + 1, "//", end - (stop + 1));
-	} while (stop != NULL && stop[-1] == '~' && stop[-1] == ':');
+	} while (stop != NULL && (stop[-1] == '~' || stop[-1] == ':'));
 	if (stop == NULL) {
 		return 0;
 	}
diff --git a/src/creole_test_main.c b/src/creole_test_main.c
index 334ba43..bae144b 100644
--- a/src/creole_test_main.c
+++ b/src/creole_test_main.c
@@ -135,6 +135,16 @@ struct {
 		.input   =  "Bold and italics should //be\nable// to cross lines.",
 		.output  =  "<p>Bold and italics should <em>be\nable</em> to cross lines.</p>"
 	},
+	{
+		.name    =  "Emphasised URL",
+		.input   =  "//https://example.com//",
+		.output  =  "<p><em><a href=\"https://example.com\">https://example.com</a></em></p>"
+	},
+	{ // I don't know that this is necessarily //correct// behavior... Let's document it anyways
+		.name    =  "Emphasised URL ending in slash",
+		.input   =  "//https://example.com///",
+		.output  =  "<p><em><a href=\"https://example.com\">https://example.com</a></em>/</p>"
+	},
 	{
 		.name    =  "Emphasis does not cross paragraph boundaries",
 		.input   =  "This text should //not\n\nbe emphased// as it crosses a paragraph boundary.",
@@ -151,11 +161,21 @@ struct {
 		            "http://www.wikicreole.org</a>. This is what can go wrong "
 		            "<em>this should be an italic text</em>.</p>"
 	},
+	{
+		.name    =  "Escaped emphasis",
+		.input   =  "I //love double ~// slashes//!",
+		.output  =  "<p>I <em>love double // slashes</em>!</p>"
+	},
 	{
 		.name    =  "Bold",
 		.input   =  "**Strong**",
 		.output  =  "<p><strong>Strong</strong></p>"
 	},
+	{
+		.name    =  "Escaped bold",
+		.input   =  "**Strong ~** still strong**",
+		.output  =  "<p><strong>Strong ** still strong</strong></p>"
+	},
 	{
 		.name    =  "Nested bold/italic",
 		.input   =  "//**Strong and emphasized**//",
-- 
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