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Prevent stale servers when using eglot-extend-to-xref

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A weak-valued hash-table is not enough to guarantee that a reference
to a zombie server in eglot--servers-by-xrefed-file variable won't
survive long enough to confuse the next call to eglot--current-server
in some buffers.

So, before this fix it was common to get "Process EGLOT ... not
running" errors if some xref-extended buffers (like system libraries)
were open and M-x eglot-reconnect was issued.  This should be
prevented now.

Note however, that even after this the eglot-extend-to-xref logic is
still flawed.  For example, if a buffer for the xref-extended buffer
happens to be already visited by the time M-. is issued to navigate to
it, Eglot won't be activated.  A half-decent workaround is to kill the
buffer and re-visit it.

* lisp/progmodes/eglot.el (eglot--servers-by-xrefed-file): Move
up.
(eglot--on-shutdown): Make sure to cleanup
eglot--servers-by-xrefed-file.
This commit is contained in:
João Távora 2022-12-22 11:29:49 +00:00
parent 9bf13a3fb9
commit bbe35c280c
1 changed files with 6 additions and 3 deletions
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9
lisp/progmodes/eglot.el
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@ -908,6 +908,9 @@ PRESERVE-BUFFERS as in `eglot-shutdown', which see."
do (with-demoted-errors "[eglot] shutdown all: %s"
(cl-loop for s in ss do (eglot-shutdown s nil nil preserve-buffers)))))
(defvar eglot--servers-by-xrefed-file
(make-hash-table :test 'equal :weakness 'value))
(defun eglot--on-shutdown (server)
"Called by jsonrpc.el when SERVER is already dead."
;; Turn off `eglot--managed-mode' where appropriate.
@ -926,6 +929,9 @@ PRESERVE-BUFFERS as in `eglot-shutdown', which see."
(setf (gethash (eglot--project server) eglot--servers-by-project)
(delq server
(gethash (eglot--project server) eglot--servers-by-project)))
(maphash (lambda (f s)
(when (eq s server) (remhash f eglot--servers-by-xrefed-file)))
eglot--servers-by-xrefed-file)
(cond ((eglot--shutdown-requested server)
t)
((not (eglot--inhibit-autoreconnect server))
@ -1057,9 +1063,6 @@ be guessed."
(put 'eglot-lsp-context 'variable-documentation
"Dynamically non-nil when searching for projects in LSP context.")
(defvar eglot--servers-by-xrefed-file
(make-hash-table :test 'equal :weakness 'value))
(defun eglot--current-project ()
"Return a project object for Eglot's LSP purposes.
This relies on `project-current' and thus on