Merge branch 'origin-maint'
[org-mode.git] / contrib / lisp / org-eval.el
blob99686695158ca8974094793d79de02ec9bd83d03
1 ;;; org-eval.el --- Display result of evaluating code in various languages
2 ;; Copyright (C) 2008-2012 Free Software Foundation, Inc.
3 ;;
4 ;; Author: Carsten Dominik <carsten at orgmode dot org>
5 ;; Keywords: outlines, hypermedia, calendar, wp
6 ;; Homepage: http://orgmode.org
7 ;; Version: 0.04
8 ;;
9 ;; This file is not yet part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 3, or (at your option)
14 ;; any later version.
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24 ;; Boston, MA 02110-1301, USA.
25 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
27 ;;; Commentary:
29 ;; This modules allows to include output from various commands into an
30 ;; Org-mode buffer, both for live display, and for export.
31 ;; This technique has been copied from emacs-wiki and Emacs Muse, and
32 ;; we try to make it work here in a way as similar as possible to
33 ;; Muse, so that people who move between both worlds don't need to learn
34 ;; new syntax.
36 ;; Basically it works like this:
38 ;; <lisp>(concat "aaa" "bbb")</lisp>
40 ;; will display "aaabbb" in the buffer and export like that as well.
41 ;; The leading lisp tag will also accept the attributes "markup" and
42 ;; "lang", to specify how the text should be formatted during export.
43 ;; For example,
45 ;; <lisp markup="src" lang="emacs-lisp"> .... </lisp>
47 ;; will format the result of the lisp form as if it was lisp source
48 ;; code. Internally, it will wrap the text into a
50 ;; #+begin_src emacs-lisp
51 ;; #+end_src
53 ;; structure so that the right things happen when the exporter is running.
55 ;; By default, only the <lisp> tag is turned on, but you can configure
56 ;; the variable `org-eval-interpreters' to add more interpreters like
57 ;; `perl', `python', or the `shell'.
59 ;; You can edit the code snippets with "C-c '" (org-edit-src-code).
61 ;; Please note that this mechanism is potentially dangerous, because it
62 ;; executes code that you don't even see. This gives you great power,
63 ;; but also enough rope to hang yourself. And, it gives your friends
64 ;; who send you Org files plenty of opportunity for good and bad jokes.
65 ;; This is also why this module is not turned on by default, but only
66 ;; available as a contributed package.
70 (require 'org)
72 ;;; Customization
74 (defgroup org-eval nil
75 "Options concerning including output from commands into the Org-mode buffer."
76 :tag "Org Eval"
77 :group 'org)
79 (defface org-eval
80 (org-compatible-face nil
81 '((((class color grayscale) (min-colors 88) (background light))
82 (:foreground "grey40"))
83 (((class color grayscale) (min-colors 88) (background dark))
84 (:foreground "grey60"))
85 (((class color) (min-colors 8) (background light))
86 (:foreground "green"))
87 (((class color) (min-colors 8) (background dark))
88 (:foreground "yellow"))))
89 "Face for command output that is included into an Org-mode buffer."
90 :group 'org-eval
91 :group 'org-faces
92 :version "22.1")
94 (defvar org-eval-regexp nil)
96 (defun org-eval-set-interpreters (var value)
97 (set-default var value)
98 (setq org-eval-regexp
99 (concat "<\\("
100 (mapconcat 'regexp-quote value "\\|")
101 "\\)"
102 "\\([^>]\\{0,50\\}?\\)>"
103 "\\([^\000]+?\\)</\\1>")))
105 (defcustom org-eval-interpreters '("lisp")
106 "Interpreters allows for evaluation tags.
107 This is a list of program names (as strings) that can evaluate code and
108 insert the output into an Org-mode buffer. Valid choices are
110 lisp Interpret Emacs Lisp code and display the result
111 shell Pass command to the shell and display the result
112 perl The perl interpreter
113 python Thy python interpreter
114 ruby The ruby interpreter"
115 :group 'org-eval
116 :set 'org-eval-set-interpreters
117 :type '(set :greedy t
118 (const "lisp")
119 (const "perl")
120 (const "python")
121 (const "ruby")
122 (const "shell")))
124 (defun org-eval-handle-snippets (limit &optional replace)
125 "Evaluate code snippets and display the results as display property.
126 When REPLACE is non-nil, replace the code region with the result (used
127 for export)."
128 (let (a)
129 (while (setq a (text-property-any (point) (or limit (point-max))
130 'org-eval t))
131 (remove-text-properties
132 a (next-single-property-change a 'org-eval nil limit)
133 '(display t intangible t org-eval t))))
134 (while (re-search-forward org-eval-regexp limit t)
135 (let* ((beg (match-beginning 0))
136 (end (match-end 0))
137 (kind (match-string 1))
138 (attr (match-string 2))
139 (code (match-string 3))
140 (value (org-eval-code kind code))
141 markup lang)
142 (if replace
143 (progn
144 (setq attr (save-match-data (org-eval-get-attributes attr))
145 markup (cdr (assoc "markup" attr))
146 lang (cdr (assoc "lang" attr)))
147 (replace-match
148 (concat (if markup (format "#+BEGIN_%s" (upcase markup)))
149 (if (and markup (equal (downcase markup) "src"))
150 (concat " " (or lang "fundamental")))
151 "\n"
152 value
153 (if markup (format "\n#+END_%s\n" (upcase markup))))
154 t t))
155 (add-text-properties
156 beg end
157 (list 'display value 'intangible t 'font-lock-multiline t
158 'face 'org-eval
159 'org-eval t))))))
161 (defun org-eval-replace-snippts ()
162 "Replace EVAL snippets in the entire buffer.
163 This should go into the `org-export-preprocess-hook'."
164 (goto-char (point-min))
165 (org-eval-handle-snippets nil 'replace))
167 (add-hook 'org-export-preprocess-hook 'org-eval-replace-snippts)
168 (add-hook 'org-font-lock-hook 'org-eval-handle-snippets)
170 (defun org-eval-get-attributes (str)
171 (let ((start 0) key value rtn)
172 (while (string-match "\\<\\([a-zA-Z]+\\)\\>=\"\\([^\"]+\\)\"" str start)
173 (setq key (match-string 1 str)
174 value (match-string 2 str)
175 start (match-end 0))
176 (push (cons key value) rtn))
177 rtn))
179 (defun org-eval-code (interpreter code)
180 (cond
181 ((equal interpreter "lisp")
182 (org-eval-lisp (concat "(progn\n" code "\n)")))
183 ((equal interpreter "shell")
184 (shell-command-to-string code))
185 ((member interpreter '("perl" "python" "ruby"))
186 (org-eval-run (executable-find interpreter) code))
187 (t (error "Cannot evaluate code type %s" interpreter))))
189 (defun org-eval-lisp (form)
190 "Evaluate the given form and return the result as a string."
191 (require 'pp)
192 (save-match-data
193 (condition-case err
194 (let ((object (eval (read form))))
195 (cond
196 ((stringp object) object)
197 ((and (listp object)
198 (not (eq object nil)))
199 (let ((string (pp-to-string object)))
200 (substring string 0 (1- (length string)))))
201 ((numberp object)
202 (number-to-string object))
203 ((eq object nil) "")
205 (pp-to-string object))))
206 (error
207 (org-display-warning (format "%s: Error evaluating %s: %s"
208 "???" form err))
209 "; INVALID LISP CODE"))))
211 (defun org-eval-run (cmd code)
212 (with-temp-buffer
213 (insert code)
214 (shell-command-on-region (point-min) (point-max) cmd nil 'replace)
215 (buffer-string)))
217 (provide 'org-eval)
219 ;;; org-eval.el ends here