Strip common punctuations from URLs

Changelog-Fixed: Fix punctuation getting included in some urls
Closes: #575

damus-c/damus.c

@@ -26,6 +26,10 @@ static inline int is_boundary(char c) {
     return !isalnum(c);
 }
 
+static inline int is_invalid_url_ending(char c) {
+    return c == '!' || c == '?' || c == ')' || c == '.' || c == ',' || c == ';';
+}
+
 static void make_cursor(struct cursor *c, const u8 *content, size_t len)
 {
     c->start = content;
@@ -221,6 +225,9 @@ static int parse_url(struct cursor *cur, struct block *block) {
         return 0;
     }
     
+    // strip any unwanted characters
+    while(is_invalid_url_ending(peek_char(cur, -1))) cur->p--;
+    
     block->type = BLOCK_URL;
     block->block.str.start = (const char *)start;
     block->block.str.end = (const char *)cur->p;

damusTests/damusTests.swift

@@ -148,6 +148,14 @@ class damusTests: XCTestCase {
         XCTAssertEqual(parsed[0].is_text, testString)
     }
     
+    func testNoParseUrlTrailingCharacters() {
+        let testString = "https://foo.bar, "
+        let parsed = parse_mentions(content: testString, tags: [])
+        
+        XCTAssertNotNil(parsed)
+        XCTAssertEqual(parsed[0].is_url?.absoluteString, "https://foo.bar")
+    }
+    
     func testParseMentionBlank() {
         let parsed = parse_mentions(content: "", tags: [["e", "event_id"]])