lisp/ob-exp.el

   1 ;;; ob-exp.el --- Exportation of org-babel source blocks
   2
   3 ;; Copyright (C) 2009-2014 Free Software Foundation, Inc.
   4
   5 ;; Authors: Eric Schulte
   6 ;;      Dan Davison
   7 ;; Keywords: literate programming, reproducible research
   8 ;; Homepage: http://orgmode.org
   9
  10 ;; This file is part of GNU Emacs.
  11
  12 ;; GNU Emacs is free software: you can redistribute it and/or modify
  13 ;; it under the terms of the GNU General Public License as published by
  14 ;; the Free Software Foundation, either version 3 of the License, or
  15 ;; (at your option) any later version.
  16
  17 ;; GNU Emacs is distributed in the hope that it will be useful,
  18 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20 ;; GNU General Public License for more details.
  21
  22 ;; You should have received a copy of the GNU General Public License
  23 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  24
  25 ;;; Code:
  26 (require 'ob-core)
  27 (require 'org-src)
  28 (eval-when-compile
  29   (require 'cl))
  30
  31 (defvar org-current-export-file)
  32 (defvar org-babel-lob-one-liner-regexp)
  33 (defvar org-babel-ref-split-regexp)
  34 (defvar org-list-forbidden-blocks)
  35
  36 (declare-function org-babel-lob-get-info "ob-lob" ())
  37 (declare-function org-babel-eval-wipe-error-buffer "ob-eval" ())
  38 (declare-function org-between-regexps-p "org"
  39                   (start-re end-re &optional lim-up lim-down))
  40 (declare-function org-get-indentation "org" (&optional line))
  41 (declare-function org-heading-components "org" ())
  42 (declare-function org-in-block-p "org" (names))
  43 (declare-function org-in-verbatim-emphasis "org" ())
  44 (declare-function org-link-search "org" (s &optional type avoid-pos stealth))
  45 (declare-function org-fill-template "org" (template alist))
  46 (declare-function org-split-string "org" (string &optional separators))
  47 (declare-function org-element-at-point "org-element" (&optional keep-trail))
  48 (declare-function org-element-context "org-element" ())
  49 (declare-function org-element-property "org-element" (property element))
  50 (declare-function org-element-type "org-element" (element))
  51 (declare-function org-escape-code-in-string "org-src" (s))
  52
  53 (defcustom org-export-babel-evaluate t
  54   "Switch controlling code evaluation during export.
  55 When set to nil no code will be evaluated as part of the export
  56 process.  When set to 'inline-only, only inline code blocks will
  57 be executed."
  58   :group 'org-babel
  59   :version "24.1"
  60   :type '(choice (const :tag "Never" nil)
  61                  (const :tag "Only inline code" inline-only)
  62                  (const :tag "Always" t)))
  63 (put 'org-export-babel-evaluate 'safe-local-variable (lambda (x) (eq x nil)))
  64
  65 (defun org-babel-exp-get-export-buffer ()
  66   "Return the current export buffer if possible."
  67   (cond
  68    ((bufferp org-current-export-file) org-current-export-file)
  69    (org-current-export-file (get-file-buffer org-current-export-file))
  70    ('otherwise
  71     (error "Requested export buffer when `org-current-export-file' is nil"))))
  72
  73 (defvar org-link-search-inhibit-query)
  74
  75 (defmacro org-babel-exp-in-export-file (lang &rest body)
  76   (declare (indent 1))
  77   `(let* ((lang-headers (intern (concat "org-babel-default-header-args:" ,lang)))
  78           (heading (nth 4 (ignore-errors (org-heading-components))))
  79           (export-buffer (current-buffer))
  80           (original-buffer (org-babel-exp-get-export-buffer)) results)
  81      (when original-buffer
  82        ;; resolve parameters in the original file so that
  83        ;; headline and file-wide parameters are included, attempt
  84        ;; to go to the same heading in the original file
  85        (set-buffer original-buffer)
  86        (save-restriction
  87          (when heading
  88            (condition-case nil
  89                (let ((org-link-search-inhibit-query t))
  90                  (org-link-search heading))
  91              (error (when heading
  92                       (goto-char (point-min))
  93                       (re-search-forward (regexp-quote heading) nil t)))))
  94          (setq results ,@body))
  95        (set-buffer export-buffer)
  96        results)))
  97 (def-edebug-spec org-babel-exp-in-export-file (form body))
  98
  99 (defun org-babel-exp-src-block (&rest headers)
 100   "Process source block for export.
 101 Depending on the 'export' headers argument, replace the source
 102 code block like this:
 103
 104 both ---- display the code and the results
 105
 106 code ---- the default, display the code inside the block but do
 107           not process
 108
 109 results - just like none only the block is run on export ensuring
 110           that it's results are present in the org-mode buffer
 111
 112 none ---- do not display either code or results upon export
 113
 114 Assume point is at the beginning of block's starting line."
 115   (interactive)
 116   (unless noninteractive (message "org-babel-exp processing..."))
 117   (save-excursion
 118     (let* ((info (org-babel-get-src-block-info 'light))
 119            (lang (nth 0 info))
 120            (raw-params (nth 2 info)) hash)
 121       ;; bail if we couldn't get any info from the block
 122       (when info
 123         ;; if we're actually going to need the parameters
 124         (when (member (cdr (assoc :exports (nth 2 info))) '("both" "results"))
 125           (org-babel-exp-in-export-file lang
 126             (setf (nth 2 info)
 127                   (org-babel-process-params
 128                    (apply #'org-babel-merge-params
 129                           org-babel-default-header-args
 130                           (if (boundp lang-headers) (eval lang-headers) nil)
 131                           (append (org-babel-params-from-properties lang)
 132                                   (list raw-params))))))
 133           (setf hash (org-babel-sha1-hash info)))
 134         (org-babel-exp-do-export info 'block hash)))))
 135
 136 (defcustom org-babel-exp-call-line-template
 137   ""
 138   "Template used to export call lines.
 139 This template may be customized to include the call line name
 140 with any export markup.  The template is filled out using
 141 `org-fill-template', and the following %keys may be used.
 142
 143  line --- call line
 144
 145 An example value would be \"\\n: call: %line\" to export the call line
 146 wrapped in a verbatim environment.
 147
 148 Note: the results are inserted separately after the contents of
 149 this template."
 150   :group 'org-babel
 151   :type 'string)
 152
 153 (defvar org-babel-default-lob-header-args)
 154 (defun org-babel-exp-process-buffer ()
 155   "Execute all Babel blocks in current buffer."
 156   (interactive)
 157   (save-window-excursion
 158     (save-excursion
 159       (let ((case-fold-search t)
 160             (regexp (concat org-babel-inline-src-block-regexp "\\|"
 161                             org-babel-lob-one-liner-regexp "\\|"
 162                             "^[ \t]*#\\+BEGIN_SRC")))
 163         (goto-char (point-min))
 164         (while (re-search-forward regexp nil t)
 165           (let* ((element (save-excursion
 166                             ;; If match is inline, point is at its
 167                             ;; end.  Move backward so
 168                             ;; `org-element-context' can get the
 169                             ;; object, not the following one.
 170                             (backward-char)
 171                             (save-match-data (org-element-context))))
 172                  (type (org-element-type element))
 173                  (begin (copy-marker (org-element-property :begin element)))
 174                  (end (copy-marker
 175                        (save-excursion
 176                          (goto-char (org-element-property :end element))
 177                          (skip-chars-backward " \r\t\n")
 178                          (point)))))
 179             (case type
 180               (inline-src-block
 181                (let* ((info (org-babel-parse-inline-src-block-match))
 182                       (params (nth 2 info)))
 183                  (setf (nth 1 info)
 184                        (if (and (cdr (assoc :noweb params))
 185                                 (string= "yes" (cdr (assoc :noweb params))))
 186                            (org-babel-expand-noweb-references
 187                             info (org-babel-exp-get-export-buffer))
 188                          (nth 1 info)))
 189                  (goto-char begin)
 190                  (let ((replacement (org-babel-exp-do-export info 'inline)))
 191                    (if (equal replacement "")
 192                        ;; Replacement code is empty: remove inline src
 193                        ;; block, including extra white space that
 194                        ;; might have been created when inserting
 195                        ;; results.
 196                        (delete-region begin
 197                                       (progn (goto-char end)
 198                                              (skip-chars-forward " \t")
 199                                              (point)))
 200                      ;; Otherwise: remove inline src block but
 201                      ;; preserve following white spaces.  Then insert
 202                      ;; value.
 203                      (delete-region begin end)
 204                      (insert replacement)))))
 205               ((babel-call inline-babel-call)
 206                (let* ((lob-info (org-babel-lob-get-info))
 207                       (results
 208                        (org-babel-exp-do-export
 209                         (list "emacs-lisp" "results"
 210                               (apply #'org-babel-merge-params
 211                                      org-babel-default-header-args
 212                                      org-babel-default-lob-header-args
 213                                      (append
 214                                       (org-babel-params-from-properties)
 215                                       (list
 216                                        (org-babel-parse-header-arguments
 217                                         (org-no-properties
 218                                          (concat
 219                                           ":var results="
 220                                           (mapconcat 'identity
 221                                                      (butlast lob-info 2)
 222                                                      " ")))))))
 223                               "" (nth 3 lob-info) (nth 2 lob-info))
 224                         'lob))
 225                       (rep (org-fill-template
 226                             org-babel-exp-call-line-template
 227                             `(("line"  . ,(nth 0 lob-info))))))
 228                  ;; If replacement is empty, completely remove the
 229                  ;; object/element, including any extra white space
 230                  ;; that might have been created when including
 231                  ;; results.
 232                  (if (equal rep "")
 233                      (delete-region
 234                       begin
 235                       (progn (goto-char end)
 236                              (if (not (eq type 'babel-call))
 237                                  (progn (skip-chars-forward " \t") (point))
 238                                (skip-chars-forward " \r\t\n")
 239                                (line-beginning-position))))
 240                    ;; Otherwise, preserve following white
 241                    ;; spaces/newlines and then, insert replacement
 242                    ;; string.
 243                    (goto-char begin)
 244                    (delete-region begin end)
 245                    (insert rep))))
 246               (src-block
 247                (let* ((match-start (copy-marker (match-beginning 0)))
 248                       (ind (org-get-indentation))
 249                       (headers
 250                        (cons
 251                         (org-element-property :language element)
 252                         (let ((params (org-element-property :parameters
 253                                                             element)))
 254                           (and params (org-split-string params "[ \t]+"))))))
 255                  ;; Take care of matched block: compute replacement
 256                  ;; string.  In particular, a nil REPLACEMENT means
 257                  ;; the block should be left as-is while an empty
 258                  ;; string should remove the block.
 259                  (let ((replacement (progn (goto-char match-start)
 260                                            (org-babel-exp-src-block headers))))
 261                    (cond ((not replacement) (goto-char end))
 262                          ((equal replacement "")
 263                           (goto-char end)
 264                           (skip-chars-forward " \r\t\n")
 265                           (beginning-of-line)
 266                           (delete-region begin (point)))
 267                          (t
 268                           (goto-char match-start)
 269                           (delete-region (point)
 270                                          (save-excursion (goto-char end)
 271                                                          (line-end-position)))
 272                           (insert replacement)
 273                           (if (or org-src-preserve-indentation
 274                                   (org-element-property :preserve-indent
 275                                                         element))
 276                               ;; Indent only the code block markers.
 277                               (save-excursion (skip-chars-backward " \r\t\n")
 278                                               (indent-line-to ind)
 279                                               (goto-char match-start)
 280                                               (indent-line-to ind))
 281                             ;; Indent everything.
 282                             (indent-rigidly match-start (point) ind)))))
 283                  (set-marker match-start nil))))
 284             (set-marker begin nil)
 285             (set-marker end nil)))))))
 286
 287 (defun org-babel-in-example-or-verbatim ()
 288   "Return true if point is in example or verbatim code.
 289 Example and verbatim code include escaped portions of
 290 an org-mode buffer code that should be treated as normal
 291 org-mode text."
 292   (or (save-match-data
 293         (save-excursion
 294           (goto-char (point-at-bol))
 295           (looking-at "[ \t]*:[ \t]")))
 296       (org-in-verbatim-emphasis)
 297       (org-in-block-p org-list-forbidden-blocks)
 298       (org-between-regexps-p "^[ \t]*#\\+begin_src" "^[ \t]*#\\+end_src")))
 299
 300 (defun org-babel-exp-do-export (info type &optional hash)
 301   "Return a string with the exported content of a code block.
 302 The function respects the value of the :exports header argument."
 303   (let ((silently (lambda () (let ((session (cdr (assoc :session (nth 2 info)))))
 304                                (when (not (and session (equal "none" session)))
 305                                  (org-babel-exp-results info type 'silent)))))
 306         (clean (lambda () (unless (eq type 'inline) (org-babel-remove-result info)))))
 307     (case (intern (or (cdr (assoc :exports (nth 2 info))) "code"))
 308       ('none (funcall silently) (funcall clean) "")
 309       ('code (funcall silently) (funcall clean) (org-babel-exp-code info))
 310       ('results (org-babel-exp-results info type nil hash) "")
 311       ('both (org-babel-exp-results info type nil hash)
 312              (org-babel-exp-code info)))))
 313
 314 (defcustom org-babel-exp-code-template
 315   "#+BEGIN_SRC %lang%switches%flags\n%body\n#+END_SRC"
 316   "Template used to export the body of code blocks.
 317 This template may be customized to include additional information
 318 such as the code block name, or the values of particular header
 319 arguments.  The template is filled out using `org-fill-template',
 320 and the following %keys may be used.
 321
 322  lang ------ the language of the code block
 323  name ------ the name of the code block
 324  body ------ the body of the code block
 325  switches -- the switches associated to the code block
 326  flags ----- the flags passed to the code block
 327
 328 In addition to the keys mentioned above, every header argument
 329 defined for the code block may be used as a key and will be
 330 replaced with its value."
 331   :group 'org-babel
 332   :type 'string)
 333
 334 (defun org-babel-exp-code (info)
 335   "Return the original code block formatted for export."
 336   (setf (nth 1 info)
 337         (if (string= "strip-export" (cdr (assoc :noweb (nth 2 info))))
 338             (replace-regexp-in-string
 339              (org-babel-noweb-wrap) "" (nth 1 info))
 340           (if (org-babel-noweb-p (nth 2 info) :export)
 341               (org-babel-expand-noweb-references
 342                info (org-babel-exp-get-export-buffer))
 343             (nth 1 info))))
 344   (org-fill-template
 345    org-babel-exp-code-template
 346    `(("lang"  . ,(nth 0 info))
 347      ("body"  . ,(org-escape-code-in-string (nth 1 info)))
 348      ("switches" . ,(let ((f (nth 3 info)))
 349                       (and (org-string-nw-p f) (concat " " f))))
 350      ("flags" . ,(let ((f (assq :flags (nth 2 info))))
 351                    (and f (concat " " (cdr f)))))
 352      ,@(mapcar (lambda (pair)
 353                  (cons (substring (symbol-name (car pair)) 1)
 354                        (format "%S" (cdr pair))))
 355                (nth 2 info))
 356      ("name"  . ,(or (nth 4 info) "")))))
 357
 358 (defun org-babel-exp-results (info type &optional silent hash)
 359   "Evaluate and return the results of the current code block for export.
 360 Results are prepared in a manner suitable for export by org-mode.
 361 This function is called by `org-babel-exp-do-export'.  The code
 362 block will be evaluated.  Optional argument SILENT can be used to
 363 inhibit insertion of results into the buffer."
 364   (when (and (or (eq org-export-babel-evaluate t)
 365                  (and (eq type 'inline)
 366                       (eq org-export-babel-evaluate 'inline-only)))
 367              (not (and hash (equal hash (org-babel-current-result-hash)))))
 368     (let ((lang (nth 0 info))
 369           (body (if (org-babel-noweb-p (nth 2 info) :eval)
 370                     (org-babel-expand-noweb-references
 371                      info (org-babel-exp-get-export-buffer))
 372                   (nth 1 info)))
 373           (info (copy-sequence info))
 374           (org-babel-current-src-block-location (point-marker)))
 375       ;; skip code blocks which we can't evaluate
 376       (when (fboundp (intern (concat "org-babel-execute:" lang)))
 377         (org-babel-eval-wipe-error-buffer)
 378         (prog1 nil
 379           (setf (nth 1 info) body)
 380           (setf (nth 2 info)
 381                 (org-babel-exp-in-export-file lang
 382                   (org-babel-process-params
 383                    (org-babel-merge-params
 384                     (nth 2 info)
 385                     `((:results . ,(if silent "silent" "replace")))))))
 386           (cond
 387            ((equal type 'block)
 388             (org-babel-execute-src-block nil info))
 389            ((equal type 'inline)
 390             ;; position the point on the inline source block allowing
 391             ;; `org-babel-insert-result' to check that the block is
 392             ;; inline
 393             (re-search-backward "[ \f\t\n\r\v]" nil t)
 394             (re-search-forward org-babel-inline-src-block-regexp nil t)
 395             (re-search-backward "src_" nil t)
 396             (org-babel-execute-src-block nil info))
 397            ((equal type 'lob)
 398             (save-excursion
 399               (re-search-backward org-babel-lob-one-liner-regexp nil t)
 400               (let (org-confirm-babel-evaluate)
 401                 (org-babel-execute-src-block nil info))))))))))
 402
 403
 404 (provide 'ob-exp)
 405
 406 ;;; ob-exp.el ends here