kakoune-lsp config, save it as `~/.config/kak/autoload/lsp.kak`

lsp.kak

eval %sh{kak-lsp/target/release/kak-lsp --kakoune --session $kak_session}

hook global WinSetOption filetype=(scala|java|nix|rust|smithy|terraform|c|python|nu|unison|cpp) %{
  lsp-enable-window

  # Show signature in the insert mode.
  lsp-auto-signature-help-enable

  # Indent guides
  # WIP: https://github.com/kakoune-lsp/kakoune-lsp/pull/720
  # lsp-indent-guides-enable window

  # Sticky contexts
  # WIP: https://github.com/kakoune-lsp/kakoune-lsp/pull/721
  # lsp-sticky-contexts-enable window

  # Inlay Code lenses (run tests, etc.)
  lsp-inlay-code-lenses-enable window

  # In-editor error/warning messages.
  lsp-inlay-diagnostics-enable window

  # Types, implicits, worksheets output.
  lsp-inlay-hints-enable window

  # IDE-like completion with LSP.
  set-option -remove window completers filename word=all

  # Auto-formatting
  hook window BufWritePre .*\.(scala|sbt|sc|nix|rs|py) lsp-formatting-sync

  # Right-side panel with hover documentation.
  nop %sh{
    if [ -z "$(tmux list-panes -af "#{==:$kak_session,#{@kak_session_lsp}}")" ]
    then
      PANE_ID="$(tmux splitw -Phdl 25% -F '#{pane_id}' -- "kak -c $kak_session -e 'rename-client hover'")"
      tmux set -pt "$PANE_ID" "@kak_session_lsp" "$kak_session"
    fi
  }

  map window normal <c-down> :lsp-next-symbol<ret>
  map window normal <c-up> :lsp-previous-symbol<ret>


  # Press <c-o> to hide completion menu.
  # When the menus hides, and there snippets available, use tab to iterate across placeholders.
  hook window InsertCompletionHide .* %{
    map window insert <tab> '<a-;>:lsp-snippets-select-next-placeholders<ret>'
  }

  hook window InsertCompletionShow .* %{
    unmap window insert <tab> '<a-;>:lsp-snippets-select-next-placeholders<ret>'
  }

}

# Focus the selected location from the goto-like buffer and show a preview in the side panel.
define-command lsp-focus-in-hover %{
  execute-keys xs^[^\s]+<ret>
  evaluate-commands -client hover %sh{
    if [ -n $kak_selection ]
    then
      FILE=$(echo $kak_selection | cut -d: -f1)
      LINE=$(echo $kak_selection | cut -d: -f2)
      if [ -n $FILE ] && [ -n $LINE ]
      then
        echo "edit $FILE $LINE; execute-keys x"
      fi
    fi
  }
}

hook global WinDisplay \*(goto|symbols|diagnostics)\* %{
  hook window NormalKey (j|<down>) lsp-focus-in-hover
  hook window NormalKey (k|<up>) lsp-focus-in-hover
}

# Close the side panel on exit.
hook global ClientClose client0 %{nop %sh{
  PANE_ID="$(tmux list-panes -af "#{==:$kak_session,#{@kak_session_lsp}}" -F '#{pane_id}')"
  if [ -n "$PANE_ID" ]
  then
    tmux killp -t "$PANE_ID"
  fi
}}

set-option global lsp_auto_highlight_references true
set-option global lsp_auto_show_code_actions true
set-option global lsp_hover_anchor false
set-option global lsp_hover_max_lines 0
set-option global lsp_insert_spaces true