Handle custom URI schemes in hover text links

plugin/core/views.py

@@ -1,3 +1,4 @@
+from urllib.parse import urlparse
 from .css import css as lsp_css
 from .protocol import CodeAction
 from .protocol import CodeActionKind
@@ -997,6 +998,34 @@ def is_location_href(href: str) -> bool:
     return href.startswith("location:")
 
 
+def starts_with_custom_uri_scheme(href: str) -> bool:
+    return urlparse(href).scheme.lower() not in ("", "http", "https")
+
+
+def row_col_from_uri_fragment(href: str) -> Tuple[Optional[int], Optional[int]]:
+    fragment = urlparse(href).fragment
+    if not fragment:
+        return (None, None)
+    rowcol = fragment.split(":")
+    row = None  # type: Optional[int]
+    col = None  # type: Optional[int]
+    if len(rowcol) >= 1:
+        try:
+            row = int(rowcol[0])
+            # rowcols in URI fragments are 1-based (dubious)
+            row -= 1
+        except Exception:
+            pass
+    if len(rowcol) >= 2:
+        try:
+            col = int(rowcol[1])
+            # rowcols in URI fragments are 1-based (dubious)
+            col -= 1
+        except Exception:
+            pass
+    return (row, col)
+
+
 def _format_diagnostic_related_info(
     config: ClientConfig,
     info: DiagnosticRelatedInformation,

plugin/hover.py

@@ -30,7 +30,9 @@
 from .core.views import MarkdownLangMap
 from .core.views import minihtml
 from .core.views import range_to_region
+from .core.views import row_col_from_uri_fragment
 from .core.views import show_lsp_popup
+from .core.views import starts_with_custom_uri_scheme
 from .core.views import text_document_position_params
 from .core.views import unpack_href_location
 from .core.views import update_lsp_popup
@@ -353,6 +355,8 @@ def on_select(targets: List[str], idx: int) -> None:
                 position = {"line": row, "character": col_utf16}  # type: Position
                 r = {"start": position, "end": position}  # type: Range
                 sublime.set_timeout_async(partial(session.open_uri_async, uri, r))
+        elif starts_with_custom_uri_scheme(href):
+            sublime.set_timeout_async(partial(self.try_open_custom_uri_async, href))
         else:
             open_in_browser(href)
 
@@ -366,3 +370,15 @@ def run_async() -> None:
                 session.run_code_action_async(actions[index], progress=True, view=self.view)
 
         sublime.set_timeout_async(run_async)
+
+    def try_open_custom_uri_async(self, href: str) -> None:
+        row, col_utf16 = row_col_from_uri_fragment(href)
+        if isinstance(row, int):
+            position = {"line": row, "character": col_utf16 or 0}  # type: Position
+            r = {"start": position, "end": position}  # type: Optional[Range]
+        else:
+            r = None
+        for session in self.sessions():
+            promise = session.open_uri_async(href, r)
+            if not promise.resolved or isinstance(promise.value, sublime.View):
+                return