Closes#37
Almost completely refactored the UI parts outline.nvim to use a Sidebar
object that implements an outline window. In init.lua, we can then store
a table of the outline for each tabpage ID.
When tabs are closed the outline is closed and sidebar reset
responsibly.
This simplifies `init.lua` quite a lot, making it the highest level
control center for the outline elements.
All lua APIs and commands should work as before.
No more obnoxious '}' on the cmdline when pressing `?`!
scope:
- More type hints
- Added class Float for creating floating windows with size that fit the
content and position centered on the screen
- show_help action for outline window (key `?`) now uses a floating
window
- :OutlineStatus now provides better information, and shows content in a
floating window.
future:
- Floating window option configuration
- preview window can adapt based on position of outline window, and not
based on config value of `position` left/right
- it can also properly vertically center-align, even when there are
horizontal splits below the outline
- fixed a few bugs associated with previous rewrite commits in init.lua
config:
- Added min_height for preview window
Previously on each outline open, the `writer.make_outline` function
might be called at least 4 times(!), after this refactor it will only be
called once. And on update cursor autocmds, also called once (previously
at least twice).
behaviour:
- Now the outline window focus and highlight can update on each cursor
move (previously CursorHold, dependent on updatetime). This is now
configurable as well.
- During fold-all/unfold-all operations, now the cursor will remain on
the same node (rather than same line in outline buffer).
- The performance improvement is not significantly observable since even
the old implementation can appear instant. One may even argue I am
fixing a problem that did not exist, but implementation-wise it's just
so much better now.
config:
- outline_window.auto_update_events, list of events to be passed to
create_user_autocmd for updating cursor focus in outline, and updating
outline items (refetching symbols), using keys cursor and items
respectively.
- outline_window.show_cursorline now supports 2 other string values:
'focus_in_outline'/'focus_in_code' which controls when to enable
cursorline. Setting to true retains the default behaviour of always
showing the cursorline. This was added because now that the cursor
focus on the outline could change on each CursorMoved, the cursorline
may pose to be qute attention-seeking during the outline cursor
updates. Hence `focus_in_outline` is added so that when focus is in
code, the cursorline for outline window is not shown.
'focus_in_code' is added so that a user who disabled
highlight_hovered_item can keep track of position in outline when
focus is in code, disabling cursorline when focus is in outline.
At any given time, if hide cursor is enabled and show_cursorline is a
string value, hiding of cursor will not be done if cursorline is not
shown in the the given situation.
implementation:
- The reason for the improvement in performance as described in the
first paragraph is due to merging of finding hover item and finding
the deepest matched node to put cursor, into writer.make_outline. This
done, when previously done in separate function, because after the
separate function (namely _highlight_hovered_item) finishes,
writer.make_outline is called *again* anyway.
- Autocmds to update cursor position in outline is now done per buffer
rather than global.
Somehow the auto unfold and unfold depth options still work perfectly,
for this we should thank simrat or which ever contributor that
modularized the folding module and made it adaptable :)
