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Eglot: support positionEncoding LSP capability (bug#61726)

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* lisp/progmodes/eglot.el(eglot-client-capabilities):  Announce the
new capability.
(eglot-bytewise-column, eglot-move-to-bytewise-column): New functions.
(eglot--managed-mode): Set 'eglot-current-column-function' and
'eglot-move-to-bytewise-column' appropriately.
This commit is contained in:
Augusto Stoffel 2023-02-26 11:47:32 +00:00 • committed by João Távora
parent b0e87e930e
commit 3e3e6d71be
1 changed files with 28 additions and 0 deletions
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28
lisp/progmodes/eglot.el
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@ -816,6 +816,9 @@ treated as in `eglot--dbind'."
`(:valueSet
[,@(mapcar
#'car eglot--tag-faces)])))
:general
(list
:positionEncodings ["utf-32" "utf-8" "utf-16"])
:experimental eglot--{})))
(cl-defgeneric eglot-workspace-folders (server)
@ -1441,6 +1444,11 @@ CONNECT-ARGS are passed as additional arguments to
(defun eglot-current-column () (- (point) (line-beginning-position)))
(defun eglot-bytewise-column ()
"Calculate current column using the LSP `utf-8' criterion."
(length (encode-coding-region (line-beginning-position) (point)
'utf-8-unix t)))
(defvar eglot-current-column-function #'eglot-lsp-abiding-column
"Function to calculate the current column.
@ -1502,6 +1510,18 @@ be set to `eglot-move-to-lsp-abiding-column' (the default), and
(setq goal-char (1- goal-char)))
(forward-char 1))))
(defun eglot-move-to-bytewise-column (column)
"Move to COLUMN as computed using the LSP `utf-8' criterion."
(let* ((bol (line-beginning-position))
(goal-byte (+ (position-bytes bol) column))
(eol (line-end-position)))
(goto-char bol)
(while (and (< (position-bytes (point)) goal-byte)
(< (point) eol))
(if (>= (char-after) #x3fff80) ; raw bytes take 2 bytes in the buffer
(setq goal-byte (1+ goal-byte)))
(forward-char 1))))
(defun eglot--lsp-position-to-point (pos-plist &optional marker)
"Convert LSP position POS-PLIST to Emacs point.
If optional MARKER, return a marker instead"
@ -1755,6 +1775,14 @@ Use `eglot-managed-p' to determine if current buffer is managed.")
:init-value nil :lighter nil :keymap eglot-mode-map
(cond
(eglot--managed-mode
(pcase (plist-get (eglot--capabilities (eglot-current-server))
:positionEncoding)
("utf-32"
(eglot--setq-saving eglot-current-column-function #'eglot-current-column)
(eglot--setq-saving eglot-move-to-column-function #'eglot-move-to-column))
("utf-8"
(eglot--setq-saving eglot-current-column-function #'eglot-bytewise-column)
(eglot--setq-saving eglot-move-to-column-function #'eglot-move-to-bytewise-column)))
(add-hook 'after-change-functions 'eglot--after-change nil t)
(add-hook 'before-change-functions 'eglot--before-change nil t)
(add-hook 'kill-buffer-hook #'eglot--managed-mode-off nil t)