So, just a status update: I know flycheck can use multiple "providers", since I've used it to get psalm + codesniffer input at the same time.
lsp-mode does not appear to be able to work with multiple language servers, but I'd really like to be able to use it as a provider for M-.
This means (to me) that I need to get flycheck+lsp working together, which seems to be the intended possibility.
But right now, I'm seeing Error (use-package): lsp-ui/:config: :start lsp-diagnostics--flycheck-start of syntax checker lsp is not a functionand my use-package stanza for lsp-ui looks like this:
(use-package lsp-ui
:requires flycheck
:after lsp-mode
:config
(flycheck-define-generic-checker 'lsp
"A syntax checker using the Language Server Protocol (LSP)
provided by lsp-mode.
See https://github.com/emacs-lsp/lsp-mode."
:start #'lsp-diagnostics--flycheck-start
:modes '(lsp-placeholder-mode) ;; placeholder
:predicate (lambda () lsp-mode)
:error-explainer (lambda (e)
(cond ((string-prefix-p "clang-tidy" (flycheck-error-message e))
(lsp-cpp-flycheck-clang-tidy-error-explainer e))
(t (flycheck-error-message e)))))
;; (lsp-flycheck-add-mode 'php-mode)
(setq
lsp-ui-doc-enable t
;; lsp-ui-doc-include-signature t
lsp-ui-flycheck-list-position 'bottom
lsp-ui-imenu-enable t
lsp-ui-peek-enable t
lsp-ui-peek-list-width 60
lsp-ui-peek-peek-height 25
lsp-ui-sideline-enable t
lsp-ui-sideline-update-mode 'line
lsp-ui-sideline-show-code-actions t
lsp-ui-sideline-show-hover nil)
:bind
(:map lsp-ui-mode-map
("C-c C-j" . lsp-ui-peek-find-definitions)
("C-c i" . lsp-ui-peek-find-implementation)
("C-c m" . lsp-ui-imenu))
:hook
(lsp-mode . lsp-ui-mode))