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;;; ycmd-eldoc.el --- Eldoc support for ycmd-mode -*- lexical-binding: t; -*-
;; Copyright (C) 2016, 2017 Peter Vasil
;; Author: Peter Vasil <mail@petervasil.net>
;; URL: https://github.com/abingham/emacs-ycmd
;; Version: 0.2
;; Package-Requires: ((ycmd "1.3") (deferred "0.5.1") (s "1.11.0") (dash "2.13.0") (let-alist "1.0.5"))
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;; To use this package, add these lines to your init.el file:
;;
;; (require 'ycmd-eldoc)
;; (add-hook 'ycmd-mode-hook 'ycmd-eldoc-setup)
;;
;;; Code:
(eval-when-compile
(require 'let-alist))
(require 'eldoc)
(require 'ycmd)
(require 'deferred)
(require 'dash)
(require 's)
(defgroup ycmd-eldoc nil
"Eldoc support for `ycmd-mode'."
:group 'ycmd
:group 'eldoc)
(defcustom ycmd-eldoc-always-semantic-server-query-modes
'(not c-mode c++-mode objc-mode)
"Modes for which `ycmd-eldoc' always queries semantic completion.
If t, the ycmd server query is always semantic. If a list, server
query is semantic for all `major-mode' symbols in that list. If
the `car' of the list is `not', server query is sematic for all
`major-mode' symbols _not_ in that list. If nil, the server query
is only semantic after a semantic trigger."
:type 'list)
(defvar-local ycmd-eldoc--cache (make-vector 2 nil))
(defvar-local ycmd-eldoc--cached-get-type-command 'none)
(defun ycmd-eldoc--documentation-function ()
"Eldoc function for `ycmd-mode'."
(when (and ycmd-mode (not (ycmd-parsing-in-progress-p)))
(deferred:$
(ycmd-eldoc--check-if-semantic-completer-exists-for-mode)
(deferred:nextc it
(lambda (response)
(when response
(ycmd-eldoc--info-at-point))))
(deferred:nextc it
(lambda (text)
(eldoc-message text))))
;; Don't show deferred object as ElDoc message
nil))
(defun ycmd-eldoc--check-if-semantic-completer-exists-for-mode ()
"Return a deferred object whose return value is t if semantic completer exists."
(deferred:$
(deferred:next
(lambda ()
(ycmd-semantic-completer-available-p)))
(deferred:nextc it
(lambda (response)
(when (and response (eq response 'none))
(message (concat "No semantic completer exists for major-mode: `%s'."
" Ycmd ELDoc mode disabled in current buffer.")
major-mode)
(ycmd-eldoc-mode -1))
(eq response t)))))
(defun ycmd-eldoc-always-semantic-server-query-p ()
"Check whether server query should be semantic."
(pcase ycmd-eldoc-always-semantic-server-query-modes
(`t t)
(`(not . ,modes) (not (memq major-mode modes)))
(modes (memq major-mode modes))))
(defmacro ycmd-eldoc--with-point-at-func-name (body)
"Move cursor to function name and evluate BODY."
(declare (indent 0) (debug t))
`(save-excursion
(ycmd-eldoc--goto-func-name)
,body))
(defun ycmd-eldoc--info-at-point ()
"Get function info at point."
(let ((symbol (ycmd-eldoc--with-point-at-func-name (symbol-at-point))))
(if (and symbol (eq symbol (aref ycmd-eldoc--cache 0)))
(aref ycmd-eldoc--cache 1)
(deferred:$
(deferred:next
(lambda ()
(when symbol
(ycmd-eldoc--with-point-at-func-name
(let ((ycmd-force-semantic-completion
(or ycmd-force-semantic-completion
(ycmd-eldoc-always-semantic-server-query-p))))
(ycmd-with-handled-server-exceptions
(ycmd-get-completions)))))))
(deferred:nextc it
(lambda (completions)
(-when-let (candidates (cdr (assq 'completions completions)))
(ycmd-eldoc--generate-message
(symbol-name symbol) candidates))))
(deferred:nextc it
(lambda (text)
(or text (ycmd-eldoc--get-type))))
(deferred:nextc it
(lambda (text)
(when text
(setq text (ycmd--fontify-code text))
(ycmd-eldoc--cache-store symbol text))))))))
(defun ycmd-eldoc--cache-store (symbol text)
"Store SYMBOL and TEXT to `ycmd-eldoc--cache'."
(aset ycmd-eldoc--cache 0 symbol)
;; Store text only if we have a symbol for lookup
(aset ycmd-eldoc--cache 1 (and symbol text))
text)
;; Source: https://github.com/racer-rust/emacs-racer/blob/master/racer.el
(defun ycmd-eldoc--goto-func-name ()
"If point is inside a function call, move to the function name.
foo(bar, |baz); -> foo|(bar, baz);"
(let ((last-paren-pos (nth 1 (syntax-ppss)))
(start-pos (point)))
(when last-paren-pos
;; Move to just before the last paren.
(goto-char last-paren-pos)
;; If we're inside a round paren, we're inside a function call.
(unless (looking-at "(")
;; Otherwise, return to our start position, as point may have been on a
;; function already:
;; foo|(bar, baz);
(goto-char start-pos)))))
(defun ycmd-eldoc--generate-message (symbol result)
"Generate eldoc message for SYMBOL from RESULT."
(-when-let* ((filtered-list
(--filter
(let-alist it
(and (s-equals? .insertion_text symbol)
(or (not .extra_menu_info)
(not (-contains?
'("[ID]" "[File]" "[Dir]" "[File&Dir]")
.extra_menu_info)))))
result))
(item (car filtered-list))
(msg (or (cdr (assq 'detailed_info item))
(cdr (assq 'extra_menu_info item)))))
(unless (s-blank? msg)
(car (s-split-up-to "\n" msg 1)))))
(defun ycmd-eldoc--get-type ()
"Get type at current position."
(when ycmd-eldoc--cached-get-type-command
(deferred:$
(ycmd-eldoc--get-type-command-deferred)
(deferred:nextc it
(lambda (cmd)
(when cmd
(ycmd-with-handled-server-exceptions (ycmd--command-request cmd)
(pcase-let ((`(,msg . ,is-type-p) (ycmd--get-message response)))
(when is-type-p msg)))))))))
(defun ycmd-eldoc--get-type-command-deferred ()
"Return a deferred object with the chached GetType command.
REQUEST-DATA is plist returned from `ycmd--get-request-data'."
(if (eq ycmd-eldoc--cached-get-type-command 'none)
(ycmd-with-handled-server-exceptions
(ycmd--request (make-ycmd-request-data
:handler "defined_subcommands"))
(setq ycmd-eldoc--cached-get-type-command
;; If GetTypeImprecise exists, use it in favor of GetType
;; because it doesn't reparse the file
(car (-intersection '("GetTypeImprecise" "GetType")
response))))
(deferred:next nil ycmd-eldoc--cached-get-type-command)))
;;;###autoload
(defun ycmd-eldoc-setup ()
"Setup eldoc for `ycmd-mode'."
(interactive)
(ycmd-eldoc-mode +1))
(make-obsolete 'ycmd-eldoc-setup 'ycmd-eldoc-mode "0.2")
(defun ycmd-eldoc--teardown ()
"Reset `ycmd-eldoc--cache'."
(ycmd-eldoc--cache-store nil nil)
(setq ycmd-eldoc--cached-get-type-command 'none))
;;;###autoload
(define-minor-mode ycmd-eldoc-mode
"Toggle ycmd eldoc mode."
:lighter ""
(cond
(ycmd-eldoc-mode
;; For emacs < 25.1 where `eldoc-documentation-function' defaults to
;; nil. See also https://github.com/abingham/emacs-ycmd/issues/409
(or eldoc-documentation-function
(setq-local eldoc-documentation-function #'ignore))
(add-function :before-until (local 'eldoc-documentation-function)
#'ycmd-eldoc--documentation-function)
(eldoc-mode +1)
(add-hook 'ycmd-after-teardown-hook
#'ycmd-eldoc--teardown nil 'local))
(t
(eldoc-mode -1)
(remove-function (local 'eldoc-documentation-function)
#'ycmd-eldoc--documentation-function)
(remove-hook 'ycmd-after-teardown-hook
#'ycmd-eldoc--teardown 'local)
(ycmd-eldoc--teardown))))
(provide 'ycmd-eldoc)
;;; ycmd-eldoc.el ends here