lisp/ob-ruby.el

   1 ;;; ob-ruby.el --- Babel Functions for Ruby          -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2009-2017 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
  41 (declare-function org-trim "org" (s &optional keep-lead))
  42 (declare-function run-ruby "ext:inf-ruby" (&optional command name))
  43 (declare-function xmp "ext:rcodetools" (&optional option))
  44
  45 (defvar inf-ruby-default-implementation)
  46 (defvar inf-ruby-implementations)
  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 (defcustom org-babel-ruby-hline-to "nil"
  57   "Replace hlines in incoming tables with this when translating to ruby."
  58   :group 'org-babel
  59   :version "24.4"
  60   :package-version '(Org . "8.0")
  61   :type 'string)
  62
  63 (defcustom org-babel-ruby-nil-to 'hline
  64   "Replace nil in ruby tables with this before returning."
  65   :group 'org-babel
  66   :version "24.4"
  67   :package-version '(Org . "8.0")
  68   :type 'symbol)
  69
  70 (defun org-babel-execute:ruby (body params)
  71   "Execute a block of Ruby code with Babel.
  72 This function is called by `org-babel-execute-src-block'."
  73   (let* ((session (org-babel-ruby-initiate-session
  74                    (cdr (assq :session params))))
  75          (result-params (cdr (assq :result-params params)))
  76          (result-type (cdr (assq :result-type params)))
  77          (full-body (org-babel-expand-body:generic
  78                      body params (org-babel-variable-assignments:ruby params)))
  79          (result (if (member "xmp" result-params)
  80                      (with-temp-buffer
  81                        (require 'rcodetools)
  82                        (insert full-body)
  83                        (xmp (cdr (assq :xmp-option params)))
  84                        (buffer-string))
  85                    (org-babel-ruby-evaluate
  86                     session full-body result-type result-params))))
  87     (org-babel-reassemble-table
  88      (org-babel-result-cond result-params
  89        result
  90        (org-babel-ruby-table-or-string result))
  91      (org-babel-pick-name (cdr (assq :colname-names params))
  92                           (cdr (assq :colnames params)))
  93      (org-babel-pick-name (cdr (assq :rowname-names params))
  94                           (cdr (assq :rownames params))))))
  95
  96 (defun org-babel-prep-session:ruby (session params)
  97   "Prepare SESSION according to the header arguments specified in PARAMS."
  98   ;; (message "params=%S" params) ;; debugging
  99   (let* ((session (org-babel-ruby-initiate-session session))
 100          (var-lines (org-babel-variable-assignments:ruby params)))
 101     (org-babel-comint-in-buffer session
 102       (sit-for .5) (goto-char (point-max))
 103       (mapc (lambda (var)
 104               (insert var) (comint-send-input nil t)
 105               (org-babel-comint-wait-for-output session)
 106               (sit-for .1) (goto-char (point-max))) var-lines))
 107     session))
 108
 109 (defun org-babel-load-session:ruby (session body params)
 110   "Load BODY into SESSION."
 111   (save-window-excursion
 112     (let ((buffer (org-babel-prep-session:ruby session params)))
 113       (with-current-buffer buffer
 114         (goto-char (process-mark (get-buffer-process (current-buffer))))
 115         (insert (org-babel-chomp body)))
 116       buffer)))
 117
 118 ;; helper functions
 119
 120 (defun org-babel-variable-assignments:ruby (params)
 121   "Return list of ruby statements assigning the block's variables."
 122   (mapcar
 123    (lambda (pair)
 124      (format "%s=%s"
 125              (car pair)
 126              (org-babel-ruby-var-to-ruby (cdr pair))))
 127    (org-babel--get-vars params)))
 128
 129 (defun org-babel-ruby-var-to-ruby (var)
 130   "Convert VAR into a ruby variable.
 131 Convert an elisp value into a string of ruby source code
 132 specifying a variable of the same value."
 133   (if (listp var)
 134       (concat "[" (mapconcat #'org-babel-ruby-var-to-ruby var ", ") "]")
 135     (if (eq var 'hline)
 136         org-babel-ruby-hline-to
 137       (format "%S" var))))
 138
 139 (defun org-babel-ruby-table-or-string (results)
 140   "Convert RESULTS into an appropriate elisp value.
 141 If RESULTS look like a table, then convert them into an
 142 Emacs-lisp table, otherwise return the results as a string."
 143   (let ((res (org-babel-script-escape results)))
 144     (if (listp res)
 145         (mapcar (lambda (el) (if (not el)
 146                                  org-babel-ruby-nil-to el))
 147                 res)
 148       res)))
 149
 150 (defun org-babel-ruby-initiate-session (&optional session _params)
 151   "Initiate a ruby session.
 152 If there is not a current inferior-process-buffer in SESSION
 153 then create one.  Return the initialized session."
 154   (unless (string= session "none")
 155     (require 'inf-ruby)
 156     (let* ((cmd (cdr (assoc inf-ruby-default-implementation
 157                             inf-ruby-implementations)))
 158            (buffer (get-buffer (format "*%s*" session)))
 159            (session-buffer (or buffer (save-window-excursion
 160                                         (run-ruby cmd session)
 161                                         (current-buffer)))))
 162       (if (org-babel-comint-buffer-livep session-buffer)
 163           (progn (sit-for .25) session-buffer)
 164         (sit-for .5)
 165         (org-babel-ruby-initiate-session session)))))
 166
 167 (defvar org-babel-ruby-eoe-indicator ":org_babel_ruby_eoe"
 168   "String to indicate that evaluation has completed.")
 169 (defvar org-babel-ruby-f-write
 170   "File.open('%s','w'){|f| f.write((_.class == String) ? _ : _.inspect)}")
 171 (defvar org-babel-ruby-pp-f-write
 172   "File.open('%s','w'){|f| $stdout = f; pp(results); $stdout = orig_out}")
 173 (defvar org-babel-ruby-wrapper-method
 174   "
 175 def main()
 176 %s
 177 end
 178 results = main()
 179 File.open('%s', 'w'){ |f| f.write((results.class == String) ? results : results.inspect) }
 180 ")
 181 (defvar org-babel-ruby-pp-wrapper-method
 182   "
 183 require 'pp'
 184 def main()
 185 %s
 186 end
 187 results = main()
 188 File.open('%s', 'w') do |f|
 189   $stdout = f
 190   pp results
 191 end
 192 ")
 193
 194 (defun org-babel-ruby-evaluate
 195     (buffer body &optional result-type result-params)
 196   "Pass BODY to the Ruby process in BUFFER.
 197 If RESULT-TYPE equals `output' then return a list of the outputs
 198 of the statements in BODY, if RESULT-TYPE equals `value' then
 199 return the value of the last statement in BODY, as elisp."
 200   (if (not buffer)
 201       ;; external process evaluation
 202       (pcase result-type
 203         (`output (org-babel-eval org-babel-ruby-command body))
 204         (`value (let ((tmp-file (org-babel-temp-file "ruby-")))
 205                   (org-babel-eval
 206                    org-babel-ruby-command
 207                    (format (if (member "pp" result-params)
 208                                org-babel-ruby-pp-wrapper-method
 209                              org-babel-ruby-wrapper-method)
 210                            body (org-babel-process-file-name tmp-file 'noquote)))
 211                   (org-babel-eval-read-file tmp-file))))
 212     ;; comint session evaluation
 213     (pcase result-type
 214       (`output
 215        (let ((eoe-string (format "puts \"%s\"" org-babel-ruby-eoe-indicator)))
 216          ;; Force the session to be ready before the actual session
 217          ;; code is run.  There is some problem in comint that will
 218          ;; sometimes show the prompt after the the input has already
 219          ;; been inserted and that throws off the extraction of the
 220          ;; result for Babel.
 221          (org-babel-comint-with-output
 222              (buffer org-babel-ruby-eoe-indicator t eoe-string)
 223            (insert eoe-string) (comint-send-input nil t))
 224          ;; Now we can start the evaluation.
 225          (mapconcat
 226           #'identity
 227           (butlast
 228            (split-string
 229             (mapconcat
 230              #'org-trim
 231              (org-babel-comint-with-output
 232                  (buffer org-babel-ruby-eoe-indicator t body)
 233                (mapc
 234                 (lambda (line)
 235                   (insert (org-babel-chomp line)) (comint-send-input nil t))
 236                 (list "conf.echo=false;_org_prompt_mode=conf.prompt_mode;conf.prompt_mode=:NULL"
 237                       body
 238                       "conf.prompt_mode=_org_prompt_mode;conf.echo=true"
 239                       eoe-string)))
 240              "\n") "[\r\n]") 4) "\n")))
 241       (`value
 242        (let* ((tmp-file (org-babel-temp-file "ruby-"))
 243               (ppp (or (member "code" result-params)
 244                        (member "pp" result-params))))
 245          (org-babel-comint-with-output
 246              (buffer org-babel-ruby-eoe-indicator t body)
 247            (when ppp (insert "require 'pp';") (comint-send-input nil t))
 248            (mapc
 249             (lambda (line)
 250               (insert (org-babel-chomp line)) (comint-send-input nil t))
 251             (append
 252              (list body)
 253              (if (not ppp)
 254                  (list (format org-babel-ruby-f-write
 255                                (org-babel-process-file-name tmp-file 'noquote)))
 256                (list
 257                 "results=_" "require 'pp'" "orig_out = $stdout"
 258                 (format org-babel-ruby-pp-f-write
 259                         (org-babel-process-file-name tmp-file 'noquote))))
 260              (list org-babel-ruby-eoe-indicator)))
 261            (comint-send-input nil t))
 262          (org-babel-eval-read-file tmp-file))))))
 263
 264 (provide 'ob-ruby)
 265
 266
 267
 268 ;;; ob-ruby.el ends here