.. rst3: filename: html/clickablelinks.html

###############
Clickable links
###############

Leo syntax colors clickable links in the body pane. They have four forms:

1. Error messages produced by flake8, mypy, pyflakes, pylint, python:

   Some of these tools produce clickable links in the log pane when run
   *within* Leo. Some do not.

   When running these tools *outside of* Leo, copying an error message from
   the *console* to Leo's log pane will create clickable links in the log
   pane. Control-clicking these links will select the proper node and line
   provided the outline contains an ``@<file>`` node for file mentioned in
   the error message.

2. UNLs based on gnxs (global node indices):

   Links of the form ``unl:gnx:`` + ``//outline#gnx`` open the given
   outline and select the first outline node with the given gnx. These UNLs
   will work as long as the node exists anywhere in the outline.

   *Note*: ``outline`` is optional. It can be an absolute path name or
   a relative path name resolved using ``@data unl-path-prefixes``.

3. Leo's headline-based UNLs, as shown in the status pane:

   Headline-based UNLs consist of ``unl://`` + ``//outline#headline-list``
   where ``headline-list`` is a list of headlines separated by ``-->``.

   *Note*: ``outline`` is optional. It can be an absolute path name or
   a relative path name resolved using ``@data unl-path-prefixes``.

4. Web URLs: file, ftp, gopher, http, https, mailto, news, nntp, prospero, telnet, wais.

   For example, Leo's forum: https://leo-editor.github.io/leo-editor/