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;;; cider-eldoc.el --- eldoc support for Clojure -*- lexical-binding: t -*-
;; Copyright © 2012-2014 Tim King, Phil Hagelberg
;; Copyright © 2013-2014 Bozhidar Batsov, Hugo Duncan, Steve Purcell
;;
;; Author: Tim King <kingtim@gmail.com>
;; Phil Hagelberg <technomancy@gmail.com>
;; Bozhidar Batsov <bozhidar@batsov.com>
;; Hugo Duncan <hugo@hugoduncan.org>
;; Steve Purcell <steve@sanityinc.com>
;; 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/>.
;; This file is not part of GNU Emacs.
;;; Commentary:
;; eldoc support for Clojure.
;;; Code:
(require 'cider-client)
(require 'cider-interaction) ; for cider-symbol-at-point
(require 'eldoc)
(require 'dash)
(defvar cider-extra-eldoc-commands '("yas-expand")
"Extra commands to be added to eldoc's safe commands list.")
(defvar-local cider-eldoc-last-symbol nil
"The eldoc information for the last symbol we checked.")
(defun cider-eldoc-format-thing (thing)
"Format the eldoc THING."
(propertize thing 'face 'font-lock-function-name-face))
(defun cider-highlight-args (arglist pos)
"Format the the function ARGLIST for eldoc.
POS is the index of the currently highlighted argument."
(let* ((rest-pos (cider--find-rest-args-position arglist))
(i 0))
(mapconcat
(lambda (arg)
(let ((argstr (format "%s" arg)))
(if (eq arg '&)
argstr
(prog1
(if (or (= (1+ i) pos)
(and rest-pos (> (+ 1 i) rest-pos)
(> pos rest-pos)))
(propertize argstr 'face
'eldoc-highlight-function-argument)
argstr)
(setq i (1+ i)))))) arglist " ")))
(defun cider--find-rest-args-position (arglist)
"Find the position of & in the ARGLIST vector."
(-elem-index '& (append arglist ())))
(defun cider-highlight-arglist (arglist pos)
"Format the ARGLIST for eldoc.
POS is the index of the argument to highlight."
(concat "[" (cider-highlight-args arglist pos) "]"))
(defun cider-eldoc-format-arglist (arglist pos)
"Format all the ARGLIST for eldoc.
POS is the index of current argument."
(concat "("
(mapconcat (lambda (args) (cider-highlight-arglist args pos))
arglist
" ")
")"))
(defun cider-eldoc-beginning-of-sexp ()
"Move to the beginning of current sexp.
Return the number of nested sexp the point was over or after. "
(let ((parse-sexp-ignore-comments t)
(num-skipped-sexps 0))
(condition-case _
(progn
;; First account for the case the point is directly over a
;; beginning of a nested sexp.
(condition-case _
(let ((p (point)))
(forward-sexp -1)
(forward-sexp 1)
(when (< (point) p)
(setq num-skipped-sexps 1)))
(error))
(while
(let ((p (point)))
(forward-sexp -1)
(when (< (point) p)
(setq num-skipped-sexps (1+ num-skipped-sexps))))))
(error))
num-skipped-sexps))
(defun cider-eldoc-info-in-current-sexp ()
"Return a list of the current sexp and the current argument index."
(save-excursion
(let ((argument-index (1- (cider-eldoc-beginning-of-sexp))))
;; If we are at the beginning of function name, this will be -1.
(when (< argument-index 0)
(setq argument-index 0))
;; Don't do anything if current word is inside a string, vector,
;; hash or set literal.
(if (member (or (char-after (1- (point))) 0) '(?\" ?\{ ?\[))
nil
(list (cider-symbol-at-point) argument-index)))))
(defun cider-eldoc-arglist (thing)
"Return the arglist for THING."
(when (and (nrepl-op-supported-p "eldoc")
thing
(not (string= thing ""))
(not (string-prefix-p ":" thing)))
;; check if we can used the cached eldoc info
(if (string= thing (car cider-eldoc-last-symbol))
(cdr cider-eldoc-last-symbol)
(-when-let (eldoc-info (cider-sync-request:eldoc (substring-no-properties thing)))
(let ((arglist (nrepl-dict-get eldoc-info "eldoc")))
(setq cider-eldoc-last-symbol (cons thing arglist))
arglist)))))
(defun cider-eldoc ()
"Backend function for eldoc to show argument list in the echo area."
(when (and (cider-connected-p)
;; don't clobber an error message in the minibuffer
(not (member last-command '(next-error previous-error))))
(let* ((info (cider-eldoc-info-in-current-sexp))
(thing (car info))
(pos (cadr info))
(value (cider-eldoc-arglist thing)))
(when value
(format "%s: %s"
(cider-eldoc-format-thing thing)
(cider-eldoc-format-arglist value pos))))))
(defun cider-turn-on-eldoc-mode ()
"Turn on eldoc mode in the current buffer."
(setq-local eldoc-documentation-function 'cider-eldoc)
(apply 'eldoc-add-command cider-extra-eldoc-commands)
(eldoc-mode +1))
(provide 'cider-eldoc)
;;; cider-eldoc.el ends here
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