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;;; org-eldoc.el --- display org header and src block info using eldoc
;; Copyright (c) 2014-2016 Free Software Foundation, Inc.
;; Author: Łukasz Gruner <lukasz@gruner.lu>
;; Maintainer: Łukasz Gruner <lukasz@gruner.lu>
;; Version: 6
;; Package-Requires: ((org "8"))
;; URL: https://bitbucket.org/ukaszg/org-eldoc
;; Created: 25/05/2014
;; Keywords: eldoc, outline, breadcrumb, org, babel, minibuffer
;; This file is not part of Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Changelog:
;; As of 01/11/14 switching license to GPL3 to allow submission to org-mode.
;; 08/11/14 switch code to automatically define eldoc-documentation-function, but don't autostart eldoc-mode.
;;; Code:
(require 'org)
(require 'ob-core)
(require 'eldoc)
(defgroup org-eldoc nil "" :group 'org)
(defcustom org-eldoc-breadcrumb-separator "/"
"Breadcrumb separator."
:group 'org-eldoc
:type 'string)
(defcustom org-eldoc-test-buffer-name " *Org-eldoc test buffer*"
"Name of the buffer used while testing for mode-local variable values."
:group 'org-eldoc
:type 'string)
(defun org-eldoc-get-breadcrumb ()
"Return breadcrumb if on a headline or nil."
(let ((case-fold-search t) cur)
(save-excursion
(beginning-of-line)
(save-match-data
(when (looking-at org-complex-heading-regexp)
(setq cur (match-string 4))
(org-format-outline-path
(append (org-get-outline-path) (list cur))
(frame-width) "" org-eldoc-breadcrumb-separator))))))
(defun org-eldoc-get-src-header ()
"Returns lang and list of header properties if on src definition line and nil otherwise."
(let ((case-fold-search t) info lang hdr-args)
(save-excursion
(beginning-of-line)
(save-match-data
(when (looking-at "^[ \t]*#\\+\\(begin\\|end\\)_src")
(setq info (org-babel-get-src-block-info 'light)
lang (propertize (nth 0 info) 'face 'font-lock-string-face)
hdr-args (nth 2 info))
(concat
lang
": "
(mapconcat
(lambda (elem)
(when (and (cdr elem) (not (string= "" (cdr elem))))
(concat
(propertize (symbol-name (car elem)) 'face 'org-list-dt)
" "
(propertize (cdr elem) 'face 'org-verbatim)
" ")))
hdr-args " ")))))))
(defun org-eldoc-get-src-lang ()
"Return value of lang for the current block if in block body and nil otherwise."
(let ((case-fold-search t))
(save-match-data
(when (org-between-regexps-p ".*#\\+begin_src"
".*#\\+end_src")
(save-excursion
(goto-char (org-babel-where-is-src-block-head))
(car (org-babel-parse-src-block-match)))))))
(defvar org-eldoc-local-functions-cache (make-hash-table :size 40 :test 'equal)
"Cache of major-mode's eldoc-documentation-functions,
used by \\[org-eldoc-get-mode-local-documentation-function].")
(defun org-eldoc-get-mode-local-documentation-function (lang)
"Check if LANG-mode sets eldoc-documentation-function and return its value."
(let ((cached-func (gethash lang org-eldoc-local-functions-cache 'empty))
(mode-func (intern-soft (format "%s-mode" lang)))
doc-func)
(if (eq 'empty cached-func)
(when (fboundp mode-func)
(with-temp-buffer
(funcall mode-func)
(setq doc-func (and eldoc-documentation-function
(symbol-value 'eldoc-documentation-function)))
(puthash lang doc-func org-eldoc-local-functions-cache))
doc-func)
cached-func)))
(declare-function c-eldoc-print-current-symbol-info "c-eldoc" ())
(declare-function css-eldoc-function "css-eldoc" ())
(declare-function php-eldoc-function "php-eldoc" ())
(declare-function go-eldoc--documentation-function "go-eldoc" ())
(defun org-eldoc-documentation-function ()
"Return breadcrumbs when on a headline, args for src block header-line,
calls other documentation functions depending on lang when inside src body."
(or
(org-eldoc-get-breadcrumb)
(org-eldoc-get-src-header)
(let ((lang (org-eldoc-get-src-lang)))
(cond ((or
(string= lang "emacs-lisp")
(string= lang "elisp")) (if (fboundp 'elisp-eldoc-documentation-function)
(elisp-eldoc-documentation-function)
(let (eldoc-documentation-function)
(eldoc-print-current-symbol-info))))
((or
(string= lang "c") ;; http://github.com/nflath/c-eldoc
(string= lang "C")) (when (require 'c-eldoc nil t)
(c-eldoc-print-current-symbol-info)))
;; https://github.com/zenozeng/css-eldoc
((string= lang "css") (when (require 'css-eldoc nil t)
(css-eldoc-function)))
;; https://github.com/zenozeng/php-eldoc
((string= lang "php") (when (require 'php-eldoc nil t)
(php-eldoc-function)))
((or
(string= lang "go")
(string= lang "golang")) (when (require 'go-eldoc nil t)
(go-eldoc--documentation-function)))
(t (let ((doc-fun (org-eldoc-get-mode-local-documentation-function lang)))
(when (fboundp doc-fun) (funcall doc-fun))))))))
;;;###autoload
(defun org-eldoc-load ()
"Set up org-eldoc documentation function."
(interactive)
(setq-local eldoc-documentation-function #'org-eldoc-documentation-function))
;;;###autoload
(add-hook 'org-mode-hook #'org-eldoc-load)
(provide 'org-eldoc)
;; -*- coding: utf-8-emacs; -*-
;;; org-eldoc.el ends here
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