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evil-ex: elisp: eldoc #1410

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evil-ex: elisp: eldoc #1410

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cb75dd8
`evil-ex': eldoc for Elisp expressions
nbfalcon Dec 24, 2020
8b9ccc7
Refactor: use `make-local-variable' to set `capf'
nbfalcon Dec 24, 2020
fa9c54b
`evil-ex': `eldoc': support Emacs < 24.4
nbfalcon Jan 25, 2021
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48 changes: 42 additions & 6 deletions evil-ex.el
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Original file line number Diff line number Diff line change
Expand Up @@ -229,6 +229,39 @@ Otherwise behaves like `delete-backward-char'."
(insert result)
(exit-minibuffer))

(defun evil-ex--elisp-p ()
"Check if `evil-ex' is executing an elisp expression."
(string-prefix-p "(" (minibuffer-contents-no-properties)))

(defun evil-ex-elisp-completion-at-point ()
"Complete an `evil-ex' Elisp expression."
(when (and (fboundp 'elisp-completion-at-point)
(evil-ex--elisp-p))
(elisp-completion-at-point)))

(defun evil-ex-elisp-eldoc-function ()
"`eldoc' for `evil-ex' Elisp expressions.
Only provides an `eldoc' hint if the current `evil-ex' command is
an elisp expression."
(when (and (fboundp 'elisp-eldoc-documentation-function)
(evil-ex--elisp-p))
(elisp-eldoc-documentation-function)))

(defmacro evil-ex--eldoc-add (fn)
"Add FN to `eldoc'.
Handles older Emacsen that don't have `add-function'."
(if (fboundp 'add-function)
`(add-function :before-until (local 'eldoc-documentation-function) ,fn)
`(add-to-list (make-local-variable 'eldoc-documentation-functions) ,fn)))

(defmacro evil-ex--eldoc-remove (fn)
"Remove FN from `eldoc'.
See `evil-ex--eldoc-add'. FN must be a symbol."
(if (fboundp 'remove-function)
`(remove-function (local 'eldoc-documentation-function) ,fn)
`(set (make-local-variable 'eldoc-documentation-functions)
(delq ,fn eldoc-documentation-functions))))

(defun evil-ex-setup ()
"Initialize Ex minibuffer.
This function registers several hooks that are used for the
Expand All @@ -239,11 +272,12 @@ interactive actions during ex state."
(when evil-ex-previous-command
(add-hook 'pre-command-hook #'evil-ex-remove-default))
(remove-hook 'minibuffer-setup-hook #'evil-ex-setup)
(with-no-warnings
(make-variable-buffer-local 'completion-at-point-functions))
(setq completion-at-point-functions
'(evil-ex-command-completion-at-point
evil-ex-argument-completion-at-point)))
(set (make-local-variable 'completion-at-point-functions)
'(evil-ex-elisp-completion-at-point
evil-ex-command-completion-at-point
evil-ex-argument-completion-at-point))
(evil-ex--eldoc-add #'evil-ex-elisp-eldoc-function)
(eldoc-mode 1))
(put 'evil-ex-setup 'permanent-local-hook t)

(defun evil-ex-setup-and-update ()
Expand All @@ -261,7 +295,9 @@ Clean up everything set up by `evil-ex-setup'."
(let ((runner (evil-ex-argument-handler-runner
evil-ex-argument-handler)))
(when runner
(funcall runner 'stop)))))
(funcall runner 'stop))))
(evil-ex--eldoc-remove #'evil-ex-elisp-eldoc-function)
(eldoc-mode -1))
(put 'evil-ex-teardown 'permanent-local-hook t)

(defun evil-ex-remove-default ()
Expand Down