Improved autolink feature

app/src/main/java/eu/faircode/email/HtmlHelper.java

@@ -60,7 +60,7 @@ import static androidx.core.text.HtmlCompat.TO_HTML_PARAGRAPH_LINES_CONSECUTIVE;
 
 public class HtmlHelper {
     private static final int PREVIEW_SIZE = 250;
-    private static Pattern pattern = Pattern.compile("([http|https]+://[\\w\\S(\\.|:|/)]+)");
+    private static Pattern pattern = Pattern.compile("https?://[\\w#%&()*+,-./:;=?@\\[\\]_|~]+");
     private static final List<String> heads = Arrays.asList("h1", "h2", "h3", "h4", "h5", "h6", "p", "table", "ol", "ul", "br", "hr");
     private static final List<String> tails = Arrays.asList("h1", "h2", "h3", "h4", "h5", "h6", "p", "ol", "ul", "li");
 

app/src/test/java/eu/faircode/email/HtmlHelperTest.java

@@ -21,8 +21,8 @@ class HtmlHelperTest {
         testAutolink(
                 "one hhhhh|spt://example.org three",
 
-                // FIXME: "hhhhh|spt" is not a proper URL scheme.
+                // This string had been wrongly interpreted as a complete URL up to February 2019.
-                "one <a href=\"hhhhh|spt://example.org\">hhhhh|spt://example.org</a> three"
+                "one hhhhh|spt://example.org three"
         );
 
         testAutolink(
@@ -37,16 +37,14 @@ class HtmlHelperTest {
         testAutolink(
                 "Go to \"http://example.org/\".",
 
-                // FIXME: The quote must not end up as part of the URL.
+                "Go to \"<a href=\"http://example.org/\">http://example.org/</a>\"."
-                "Go to \"<a href=\"http://example.org/\".\">http://example.org/\".</a>"
         );
 
         testAutolink(
                 "Go to <http://example.org/>.",
 
                 // FIXME: The < must be encoded as &lt;.
-                // FIXME: THe > must not end up as part of the URL.
+                "Go to <<a href=\"http://example.org/\">http://example.org/</a>>."
-                "Go to <<a href=\"http://example.org/>.\">http://example.org/>.</a>"
         );
     }