parse fediverse handles as text

closes #82

src/parser/parse_from_text/text_elements.rs

@@ -89,6 +89,12 @@ pub(crate) fn email_address(input: &str) -> IResult<&str, Element, CustomError<&
     }
 }
 
+// see https://github.com/deltachat/message-parser/issues/82
+pub(crate) fn fediverse_address_as_text(input: &str) -> IResult<&str, Element, CustomError<&str>> {
+    let (input, consumed) = recognize(tuple((tag("@"), email_address)))(input)?;
+    Ok((input, Element::Text(consumed)))
+}
+
 /*
 fn not_link_part_char(c: char) -> bool {
     !matches!(c, ':' | '\n' | '\r' | '\t' | ' ')
@@ -276,6 +282,8 @@ pub(crate) fn parse_text_element(
         }
     } {
         Ok((i, elm))
+    } else if let Ok((i, elm)) = fediverse_address_as_text(input) {
+        Ok((i, elm))
     } else if let Ok((i, elm)) = email_address(input) {
         Ok((i, elm))
     } else if let Ok((i, destination)) = LinkDestination::parse(input) {

tests/based_on_issue/fediverse_handle_82.rs

@@ -0,0 +1,41 @@
+use deltachat_message_parser::parser::Element::*;
+use deltachat_message_parser::parser::{parse_desktop_set, parse_markdown_text, parse_only_text};
+
+/// don't parse fediverse handles as email addresses.
+/// as disscussed in https://github.com/deltachat/message-parser/issues/82
+
+#[test]
+fn text_only_fediverse_address_should_be_parsed_as_text() {
+    assert_eq!(
+        parse_only_text("you can reach me on @[email protected]!"),
+        vec![
+            Text("you can reach me on "),
+            Text("@[email protected]"),
+            Text("!")
+        ]
+    );
+}
+
+#[test]
+fn desktop_set_fediverse_address_should_be_parsed_as_text() {
+    assert_eq!(
+        parse_desktop_set("you can reach me on @[email protected]!"),
+        vec![
+            Text("you can reach me on "),
+            Text("@[email protected]"),
+            Text("!")
+        ]
+    );
+}
+
+#[test]
+fn markdown_fediverse_address_should_be_parsed_as_text() {
+    assert_eq!(
+        parse_markdown_text("you can reach me on @[email protected]!"),
+        vec![
+            Text("you can reach me on "),
+            Text("@[email protected]"),
+            Text("!")
+        ]
+    );
+}

tests/based_on_issue/mod.rs

@@ -0,0 +1 @@
+pub mod fediverse_handle_82;

tests/test.rs

@@ -1,3 +1,4 @@
+mod based_on_issue;
 mod emoji;
 mod links;
 mod text_to_ast;