lisp/ob-ruby.el

   1 ;;; ob-ruby.el --- org-babel functions for ruby evaluation
   2
   3 ;; Copyright (C) 2009-2012  Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://orgmode.org
   8
   9 ;; This file is part of GNU Emacs.
  10
  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 of the License, or
  14 ;; (at your option) any later version.
  15
  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.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Org-Babel support for evaluating ruby source code.
  27
  28 ;;; Requirements:
  29
  30 ;; - ruby and irb executables :: http://www.ruby-lang.org/
  31 ;;
  32 ;; - ruby-mode :: Can be installed through ELPA, or from
  33 ;;   http://github.com/eschulte/rinari/raw/master/util/ruby-mode.el
  34 ;;
  35 ;; - inf-ruby mode :: Can be installed through ELPA, or from
  36 ;;   http://github.com/eschulte/rinari/raw/master/util/inf-ruby.el
  37
  38 ;;; Code:
  39 (require 'ob)
  40 (require 'ob-ref)
  41 (require 'ob-comint)
  42 (require 'ob-eval)
  43 (eval-when-compile (require 'cl))
  44
  45 (declare-function run-ruby "ext:inf-ruby" (&optional command name))
  46 (declare-function xmp "ext:rcodetools" (&optional option))
  47
  48 (defvar org-babel-tangle-lang-exts)
  49 (add-to-list 'org-babel-tangle-lang-exts '("ruby" . "rb"))
  50
  51 (defvar org-babel-default-header-args:ruby '())
  52
  53 (defvar org-babel-ruby-command "ruby"
  54   "Name of command to use for executing ruby code.")
  55
  56 (defun org-babel-execute:ruby (body params)
  57   "Execute a block of Ruby code with Babel.
  58 This function is called by `org-babel-execute-src-block'."
  59   (let* ((session (org-babel-ruby-initiate-session
  60                    (cdr (assoc :session params))))
  61          (result-params (cdr (assoc :result-params params)))
  62          (result-type (cdr (assoc :result-type params)))
  63          (full-body (org-babel-expand-body:generic
  64                      body params (org-babel-variable-assignments:ruby params)))
  65          (result (if (member "xmp" result-params)
  66                      (with-temp-buffer
  67                        (require 'rcodetools)
  68                        (insert full-body)
  69                        (xmp (cdr (assoc :xmp-option params)))
  70                        (buffer-string))
  71                    (org-babel-ruby-evaluate
  72                     session full-body result-type result-params))))
  73     (org-babel-reassemble-table
  74      result
  75      (org-babel-pick-name (cdr (assoc :colname-names params))
  76                           (cdr (assoc :colnames params)))
  77      (org-babel-pick-name (cdr (assoc :rowname-names params))
  78                           (cdr (assoc :rownames params))))))
  79
  80 (defun org-babel-prep-session:ruby (session params)
  81   "Prepare SESSION according to the header arguments specified in PARAMS."
  82   ;; (message "params=%S" params) ;; debugging
  83   (let* ((session (org-babel-ruby-initiate-session session))
  84          (var-lines (org-babel-variable-assignments:ruby params)))
  85     (org-babel-comint-in-buffer session
  86       (sit-for .5) (goto-char (point-max))
  87       (mapc (lambda (var)
  88               (insert var) (comint-send-input nil t)
  89               (org-babel-comint-wait-for-output session)
  90               (sit-for .1) (goto-char (point-max))) var-lines))
  91     session))
  92
  93 (defun org-babel-load-session:ruby (session body params)
  94   "Load BODY into SESSION."
  95   (save-window-excursion
  96     (let ((buffer (org-babel-prep-session:ruby session params)))
  97       (with-current-buffer buffer
  98         (goto-char (process-mark (get-buffer-process (current-buffer))))
  99         (insert (org-babel-chomp body)))
 100       buffer)))
 101
 102 ;; helper functions
 103
 104 (defun org-babel-variable-assignments:ruby (params)
 105   "Return list of ruby statements assigning the block's variables."
 106   (mapcar
 107    (lambda (pair)
 108      (format "%s=%s"
 109              (car pair)
 110              (org-babel-ruby-var-to-ruby (cdr pair))))
 111    (mapcar #'cdr (org-babel-get-header params :var))))
 112
 113 (defun org-babel-ruby-var-to-ruby (var)
 114   "Convert VAR into a ruby variable.
 115 Convert an elisp value into a string of ruby source code
 116 specifying a variable of the same value."
 117   (if (listp var)
 118       (concat "[" (mapconcat #'org-babel-ruby-var-to-ruby var ", ") "]")
 119     (format "%S" var)))
 120
 121 (defun org-babel-ruby-table-or-string (results)
 122   "Convert RESULTS into an appropriate elisp value.
 123 If RESULTS look like a table, then convert them into an
 124 Emacs-lisp table, otherwise return the results as a string."
 125   (org-babel-script-escape results))
 126
 127 (defun org-babel-ruby-initiate-session (&optional session params)
 128   "Initiate a ruby session.
 129 If there is not a current inferior-process-buffer in SESSION
 130 then create one.  Return the initialized session."
 131   (unless (string= session "none")
 132     (require 'inf-ruby)
 133     (let ((session-buffer (save-window-excursion
 134                             (run-ruby nil session) (current-buffer))))
 135       (if (org-babel-comint-buffer-livep session-buffer)
 136           (progn (sit-for .25) session-buffer)
 137         (sit-for .5)
 138         (org-babel-ruby-initiate-session session)))))
 139
 140 (defvar org-babel-ruby-eoe-indicator ":org_babel_ruby_eoe"
 141   "String to indicate that evaluation has completed.")
 142 (defvar org-babel-ruby-f-write
 143   "File.open('%s','w'){|f| f.write((_.class == String) ? _ : _.inspect)}")
 144 (defvar org-babel-ruby-pp-f-write
 145   "File.open('%s','w'){|f| $stdout = f; pp(results); $stdout = orig_out}")
 146 (defvar org-babel-ruby-wrapper-method
 147   "
 148 def main()
 149 %s
 150 end
 151 results = main()
 152 File.open('%s', 'w'){ |f| f.write((results.class == String) ? results : results.inspect) }
 153 ")
 154 (defvar org-babel-ruby-pp-wrapper-method
 155   "
 156 require 'pp'
 157 def main()
 158 %s
 159 end
 160 results = main()
 161 File.open('%s', 'w') do |f|
 162   $stdout = f
 163   pp results
 164 end
 165 ")
 166
 167 (defun org-babel-ruby-evaluate
 168   (buffer body &optional result-type result-params)
 169   "Pass BODY to the Ruby process in BUFFER.
 170 If RESULT-TYPE equals 'output then return a list of the outputs
 171 of the statements in BODY, if RESULT-TYPE equals 'value then
 172 return the value of the last statement in BODY, as elisp."
 173   (if (not buffer)
 174       ;; external process evaluation
 175       (case result-type
 176         (output (org-babel-eval org-babel-ruby-command body))
 177         (value (let ((tmp-file (org-babel-temp-file "ruby-")))
 178                  (org-babel-eval
 179                   org-babel-ruby-command
 180                   (format (if (member "pp" result-params)
 181                               org-babel-ruby-pp-wrapper-method
 182                             org-babel-ruby-wrapper-method)
 183                           body (org-babel-process-file-name tmp-file 'noquote)))
 184                  ((lambda (raw)
 185                     (if (or (member "code" result-params)
 186                             (member "pp" result-params))
 187                         raw
 188                       (org-babel-ruby-table-or-string raw)))
 189                   (org-babel-eval-read-file tmp-file)))))
 190     ;; comint session evaluation
 191     (case result-type
 192       (output
 193        (mapconcat
 194         #'identity
 195         (butlast
 196          (split-string
 197           (mapconcat
 198            #'org-babel-trim
 199            (butlast
 200             (org-babel-comint-with-output
 201                 (buffer org-babel-ruby-eoe-indicator t body)
 202               (mapc
 203                (lambda (line)
 204                  (insert (org-babel-chomp line)) (comint-send-input nil t))
 205                (list body org-babel-ruby-eoe-indicator))
 206               (comint-send-input nil t)) 2)
 207            "\n") "[\r\n]")) "\n"))
 208       (value
 209        ((lambda (results)
 210           (if (or (member "code" result-params) (member "pp" result-params))
 211               results
 212             (org-babel-ruby-table-or-string results)))
 213         (let* ((tmp-file (org-babel-temp-file "ruby-"))
 214                (ppp (or (member "code" result-params)
 215                         (member "pp" result-params))))
 216           (org-babel-comint-with-output
 217               (buffer org-babel-ruby-eoe-indicator t body)
 218             (when ppp (insert "require 'pp';") (comint-send-input nil t))
 219             (mapc
 220              (lambda (line)
 221                (insert (org-babel-chomp line)) (comint-send-input nil t))
 222              (append
 223               (list body)
 224               (if (not ppp)
 225                   (list (format org-babel-ruby-f-write
 226                                 (org-babel-process-file-name tmp-file 'noquote)))
 227                 (list
 228                  "results=_" "require 'pp'" "orig_out = $stdout"
 229                  (format org-babel-ruby-pp-f-write
 230                          (org-babel-process-file-name tmp-file 'noquote))))
 231               (list org-babel-ruby-eoe-indicator)))
 232             (comint-send-input nil t))
 233           (org-babel-eval-read-file tmp-file)))))))
 234
 235 (defun org-babel-ruby-read-string (string)
 236   "Strip \\\"s from around a ruby string."
 237   (if (string-match "^\"\\([^\000]+\\)\"$" string)
 238       (match-string 1 string)
 239     string))
 240
 241 (provide 'ob-ruby)
 242
 243
 244
 245 ;;; ob-ruby.el ends here