It makes sense to store the provider each sidebar is using with own
self.provider fields, no way that did not occur to me before this.
The old `_G._outline_current_provider` ironically, can now be replaced
by `require('outline').current.provider`.
Currently the implementation is very limited.
Ref: #24
- Outline must be open and have been loaded for it to work (requires
lazy loading or headless loading of Sidebar)
- Empty string returned if cursor is not in any symbol ('closest' symbol
not yet supported)
- Line column not used
- Returning concatenated symbol names rather than a list of tables with
node info (requires a refactor of outline.SymbolNode type)
- Subject to config.symbols.filter and folds (requires finding hover
list somewhere outside of writer.make_outline)
- Provider priorities can now be configured through `providers.priority`
- Each provider can have a get_status() function that returns a string
for its status. For LSP it returns the client name.
- :OutlineStatus logic refactored, together with provider checking
functions in `providers/init.lua`
- Switch from vim.lsp.buf_get_clients to vim.lsp.get_active_clients
(former was deprecated)
- Fixed a careless mistake from symbols-outline that seems to be an
unreachable bug (lsp)
