documents: link addresses stay out of the log; tests for the link rules and the extended syntax

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

src/documents/document/tests/links.rs

@@ -0,0 +1,60 @@
+use std::{cell::RefCell, rc::Rc};
+
+use gpui::{Entity, Modifiers, MouseButton, TestAppContext, VisualTestContext, point, px};
+
+use super::{MarkdownDocument, MarkdownMode, open};
+
+const LINKED: &str = "[a long linked line of text](https://ely.dev)\n";
+
+/// Links pressed so far, as the owner hears them.
+fn heard(
+    document: &Entity<MarkdownDocument>,
+    cx: &mut VisualTestContext,
+) -> Rc<RefCell<Vec<String>>> {
+    let heard = Rc::new(RefCell::new(Vec::new()));
+    let kept = heard.clone();
+    document.update(cx, |document, _| {
+        document.on_link(move |url, _, _| kept.borrow_mut().push(url.to_string()))
+    });
+    heard
+}
+
+/// Presses the text of block 0, past its padding.
+fn press_text(modifiers: Modifiers, cx: &mut VisualTestContext) {
+    let bounds = cx
+        .debug_bounds("markdown-block-0")
+        .expect("the block is drawn");
+    let at = point(bounds.left() + px(16.0), bounds.top() + px(10.0));
+    cx.simulate_mouse_down(at, MouseButton::Left, modifiers);
+    cx.simulate_mouse_up(at, MouseButton::Left, modifiers);
+    cx.run_until_parked();
+}
+
+fn is_open(document: &Entity<MarkdownDocument>, cx: &mut VisualTestContext) -> bool {
+    document.read_with(cx, |document, _| document.open.is_some())
+}
+
+#[gpui::test]
+fn a_click_in_preview_hands_the_link_over(cx: &mut TestAppContext) {
+    let (document, cx) = open(LINKED, MarkdownMode::Preview, cx);
+    let heard = heard(&document, cx);
+    press_text(Modifiers::none(), cx);
+    assert_eq!(*heard.borrow(), ["https://ely.dev"]);
+}
+
+#[gpui::test]
+fn a_plain_press_in_visual_edits_the_block(cx: &mut TestAppContext) {
+    let (document, cx) = open(LINKED, MarkdownMode::Visual, cx);
+    let heard = heard(&document, cx);
+    press_text(Modifiers::none(), cx);
+    assert!(heard.borrow().is_empty() && is_open(&document, cx));
+}
+
+#[gpui::test]
+fn a_secondary_press_in_visual_hands_the_link_over(cx: &mut TestAppContext) {
+    let (document, cx) = open(LINKED, MarkdownMode::Visual, cx);
+    let heard = heard(&document, cx);
+    press_text(Modifiers::secondary_key(), cx);
+    assert_eq!(*heard.borrow(), ["https://ely.dev"]);
+    assert!(!is_open(&document, cx), "no block opens");
+}

src/documents/document/tests/mod.rs

@@ -366,6 +366,7 @@ fn a_press_after_a_write_back_waits_for_the_long_read(cx: &mut TestAppContext) {
 }
 
 mod history;
+mod links;
 mod place;
 
 #[gpui::test]