lisp/ob-lua.el

   1 ;;; ob-lua.el --- Org Babel functions for Lua evaluation -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2014, 2016 Free Software Foundation, Inc.
   4
   5 ;; Authors: Dieter Schoen
   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 ;; Requirements:
  25 ;; for session support, lua-mode is needed.
  26 ;; lua-mode is not part of GNU Emacs/orgmode, but can be obtained
  27 ;; from marmalade or melpa.
  28 ;; The source respository is here:
  29 ;; https://github.com/immerrr/lua-mode
  30
  31 ;; However, sessions are not yet working.
  32
  33 ;; Org-Babel support for evaluating lua source code.
  34
  35 ;;; Code:
  36 (require 'ob)
  37 (require 'cl-lib)
  38
  39 (declare-function org-remove-indentation "org" (code &optional n))
  40 (declare-function org-trim "org" (s &optional keep-lead))
  41 (declare-function lua-shell "ext:lua-mode" (&optional argprompt))
  42 (declare-function lua-toggle-shells "ext:lua-mode" (arg))
  43 (declare-function run-lua "ext:lua" (cmd &optional dedicated show))
  44
  45 (defvar org-babel-tangle-lang-exts)
  46 (add-to-list 'org-babel-tangle-lang-exts '("lua" . "lua"))
  47
  48 (defvar org-babel-default-header-args:lua '())
  49
  50 (defcustom org-babel-lua-command "lua"
  51   "Name of the command for executing Lua code."
  52   :version "24.5"
  53   :package-version '(Org . "8.3")
  54   :group 'org-babel
  55   :type 'string)
  56
  57 (defcustom org-babel-lua-mode 'lua-mode
  58   "Preferred lua mode for use in running lua interactively.
  59 This will typically be 'lua-mode."
  60   :group 'org-babel
  61   :version "24.5"
  62   :package-version '(Org . "8.3")
  63   :type 'symbol)
  64
  65 (defcustom org-babel-lua-hline-to "None"
  66   "Replace hlines in incoming tables with this when translating to lua."
  67   :group 'org-babel
  68   :version "24.5"
  69   :package-version '(Org . "8.3")
  70   :type 'string)
  71
  72 (defcustom org-babel-lua-None-to 'hline
  73   "Replace 'None' in lua tables with this before returning."
  74   :group 'org-babel
  75   :version "24.5"
  76   :package-version '(Org . "8.3")
  77   :type 'symbol)
  78
  79 (defun org-babel-execute:lua (body params)
  80   "Execute a block of Lua code with Babel.
  81 This function is called by `org-babel-execute-src-block'."
  82   (let* ((session (org-babel-lua-initiate-session
  83                    (cdr (assq :session params))))
  84          (result-params (cdr (assq :result-params params)))
  85          (result-type (cdr (assq :result-type params)))
  86          (return-val (when (and (eq result-type 'value) (not session))
  87                        (cdr (assq :return params))))
  88          (preamble (cdr (assq :preamble params)))
  89          (full-body
  90           (org-babel-expand-body:generic
  91            (concat body (if return-val (format "\nreturn %s" return-val) ""))
  92            params (org-babel-variable-assignments:lua params)))
  93          (result (org-babel-lua-evaluate
  94                   session full-body result-type result-params preamble)))
  95     (org-babel-reassemble-table
  96      result
  97      (org-babel-pick-name (cdr (assq :colname-names params))
  98                           (cdr (assq :colnames params)))
  99      (org-babel-pick-name (cdr (assq :rowname-names params))
 100                           (cdr (assq :rownames params))))))
 101
 102 (defun org-babel-prep-session:lua (session params)
 103   "Prepare SESSION according to the header arguments in PARAMS.
 104 VARS contains resolved variable references"
 105   (let* ((session (org-babel-lua-initiate-session session))
 106          (var-lines
 107           (org-babel-variable-assignments:lua params)))
 108     (org-babel-comint-in-buffer session
 109       (mapc (lambda (var)
 110               (end-of-line 1) (insert var) (comint-send-input)
 111               (org-babel-comint-wait-for-output session)) var-lines))
 112     session))
 113
 114 (defun org-babel-load-session:lua (session body params)
 115   "Load BODY into SESSION."
 116   (save-window-excursion
 117     (let ((buffer (org-babel-prep-session:lua session params)))
 118       (with-current-buffer buffer
 119         (goto-char (process-mark (get-buffer-process (current-buffer))))
 120         (insert (org-babel-chomp body)))
 121       buffer)))
 122
 123 ;; helper functions
 124
 125 (defun org-babel-variable-assignments:lua (params)
 126   "Return a list of Lua statements assigning the block's variables."
 127   (mapcar
 128    (lambda (pair)
 129      (format "%s=%s"
 130              (car pair)
 131              (org-babel-lua-var-to-lua (cdr pair))))
 132    (org-babel--get-vars params)))
 133
 134 (defun org-babel-lua-var-to-lua (var)
 135   "Convert an elisp value to a lua variable.
 136 Convert an elisp value, VAR, into a string of lua source code
 137 specifying a variable of the same value."
 138   (if (listp var)
 139       (if (and (= 1 (length var)) (not (listp (car var))))
 140           (org-babel-lua-var-to-lua (car var))
 141         (if (and
 142              (= 2 (length var))
 143              (not (listp (car var))))
 144             (concat
 145              (substring-no-properties (car var))
 146              "="
 147              (org-babel-lua-var-to-lua (cdr var)))
 148           (concat "{" (mapconcat #'org-babel-lua-var-to-lua var ", ") "}")))
 149     (if (eq var 'hline)
 150         org-babel-lua-hline-to
 151       (format
 152        (if (and (stringp var) (string-match "[\n\r]" var)) "\"\"%S\"\"" "%S")
 153        (if (stringp var) (substring-no-properties var) var)))))
 154
 155 (defun org-babel-lua-table-or-string (results)
 156   "Convert RESULTS into an appropriate elisp value.
 157 If the results look like a list or tuple, then convert them into an
 158 Emacs-lisp table, otherwise return the results as a string."
 159   (let ((res (org-babel-script-escape results)))
 160     (if (listp res)
 161         (mapcar (lambda (el) (if (eq el 'None)
 162                                  org-babel-lua-None-to el))
 163                 res)
 164       res)))
 165
 166 (defvar org-babel-lua-buffers '((:default . "*Lua*")))
 167
 168 (defun org-babel-lua-session-buffer (session)
 169   "Return the buffer associated with SESSION."
 170   (cdr (assoc session org-babel-lua-buffers)))
 171
 172 (defun org-babel-lua-with-earmuffs (session)
 173   (let ((name (if (stringp session) session (format "%s" session))))
 174     (if (and (string= "*" (substring name 0 1))
 175              (string= "*" (substring name (- (length name) 1))))
 176         name
 177       (format "*%s*" name))))
 178
 179 (defun org-babel-lua-without-earmuffs (session)
 180   (let ((name (if (stringp session) session (format "%s" session))))
 181     (if (and (string= "*" (substring name 0 1))
 182              (string= "*" (substring name (- (length name) 1))))
 183         (substring name 1 (- (length name) 1))
 184       name)))
 185
 186 (defvar lua-default-interpreter)
 187 (defvar lua-which-bufname)
 188 (defvar lua-shell-buffer-name)
 189 (defun org-babel-lua-initiate-session-by-key (&optional session)
 190   "Initiate a lua session.
 191 If there is not a current inferior-process-buffer in SESSION
 192 then create.  Return the initialized session."
 193   ;; (require org-babel-lua-mode)
 194   (save-window-excursion
 195     (let* ((session (if session (intern session) :default))
 196            (lua-buffer (org-babel-lua-session-buffer session))
 197            ;; (cmd (if (member system-type '(cygwin windows-nt ms-dos))
 198            ;;       (concat org-babel-lua-command " -i")
 199            ;;     org-babel-lua-command))
 200            )
 201       (cond
 202        ((and (eq 'lua-mode org-babel-lua-mode)
 203              (fboundp 'lua-start-process)) ; lua-mode.el
 204         ;; Make sure that lua-which-bufname is initialized, as otherwise
 205         ;; it will be overwritten the first time a Lua buffer is
 206         ;; created.
 207         ;;(lua-toggle-shells lua-default-interpreter)
 208         ;; `lua-shell' creates a buffer whose name is the value of
 209         ;; `lua-which-bufname' with '*'s at the beginning and end
 210         (let* ((bufname (if (and lua-buffer (buffer-live-p lua-buffer))
 211                             (replace-regexp-in-string ;; zap surrounding *
 212                              "^\\*\\([^*]+\\)\\*$" "\\1" (buffer-name lua-buffer))
 213                           (concat "Lua-" (symbol-name session))))
 214                (lua-which-bufname bufname))
 215           (lua-start-process)
 216           (setq lua-buffer (org-babel-lua-with-earmuffs bufname))))
 217        (t
 218         (error "No function available for running an inferior Lua")))
 219       (setq org-babel-lua-buffers
 220             (cons (cons session lua-buffer)
 221                   (assq-delete-all session org-babel-lua-buffers)))
 222       session)))
 223
 224 (defun org-babel-lua-initiate-session (&optional session _params)
 225   "Create a session named SESSION according to PARAMS."
 226   (unless (string= session "none")
 227     (error "Sessions currently not supported, work in progress")
 228     (org-babel-lua-session-buffer
 229      (org-babel-lua-initiate-session-by-key session))))
 230
 231 (defvar org-babel-lua-eoe-indicator "--eoe"
 232   "A string to indicate that evaluation has completed.")
 233
 234 (defvar org-babel-lua-wrapper-method
 235   "
 236 function main()
 237 %s
 238 end
 239
 240 fd=io.open(\"%s\", \"w\")
 241 fd:write( main() )
 242 fd:close()")
 243 (defvar org-babel-lua-pp-wrapper-method
 244   "
 245 -- table to string
 246 function t2s(t, indent)
 247    if indent == nil then
 248       indent = \"\"
 249    end
 250    if type(t) == \"table\" then
 251       ts = \"\"
 252       for k,v in pairs(t) do
 253          if type(v) == \"table\" then
 254             ts = ts .. indent .. t2s(k,indent .. \"  \") .. \" = \\n\" ..
 255                t2s(v, indent .. \"  \")
 256          else
 257             ts = ts .. indent .. t2s(k,indent .. \"  \") .. \" = \" ..
 258                t2s(v, indent .. \"  \") .. \"\\n\"
 259          end
 260       end
 261       return ts
 262    else
 263       return tostring(t)
 264    end
 265 end
 266
 267
 268 function main()
 269 %s
 270 end
 271
 272 fd=io.open(\"%s\", \"w\")
 273 fd:write(t2s(main()))
 274 fd:close()")
 275
 276 (defun org-babel-lua-evaluate
 277     (session body &optional result-type result-params preamble)
 278   "Evaluate BODY as Lua code."
 279   (if session
 280       (org-babel-lua-evaluate-session
 281        session body result-type result-params)
 282     (org-babel-lua-evaluate-external-process
 283      body result-type result-params preamble)))
 284
 285 (defun org-babel-lua-evaluate-external-process
 286     (body &optional result-type result-params preamble)
 287   "Evaluate BODY in external lua process.
 288 If RESULT-TYPE equals 'output then return standard output as a
 289 string.  If RESULT-TYPE equals 'value then return the value of the
 290 last statement in BODY, as elisp."
 291   (let ((raw
 292          (pcase result-type
 293            (`output (org-babel-eval org-babel-lua-command
 294                                     (concat (if preamble (concat preamble "\n"))
 295                                             body)))
 296            (`value (let ((tmp-file (org-babel-temp-file "lua-")))
 297                      (org-babel-eval
 298                       org-babel-lua-command
 299                       (concat
 300                        (if preamble (concat preamble "\n") "")
 301                        (format
 302                         (if (member "pp" result-params)
 303                             org-babel-lua-pp-wrapper-method
 304                           org-babel-lua-wrapper-method)
 305                         (mapconcat
 306                          (lambda (line) (format "\t%s" line))
 307                          (split-string
 308                           (org-remove-indentation
 309                            (org-trim body))
 310                           "[\r\n]") "\n")
 311                         (org-babel-process-file-name tmp-file 'noquote))))
 312                      (org-babel-eval-read-file tmp-file))))))
 313     (org-babel-result-cond result-params
 314       raw
 315       (org-babel-lua-table-or-string (org-trim raw)))))
 316
 317 (defun org-babel-lua-evaluate-session
 318     (session body &optional result-type result-params)
 319   "Pass BODY to the Lua process in SESSION.
 320 If RESULT-TYPE equals 'output then return standard output as a
 321 string.  If RESULT-TYPE equals 'value then return the value of the
 322 last statement in BODY, as elisp."
 323   (let* ((send-wait (lambda () (comint-send-input nil t) (sleep-for 0 5)))
 324          (dump-last-value
 325           (lambda
 326             (tmp-file pp)
 327             (mapc
 328              (lambda (statement) (insert statement) (funcall send-wait))
 329              (if pp
 330                  (list
 331                   "-- table to string
 332 function t2s(t, indent)
 333    if indent == nil then
 334       indent = \"\"
 335    end
 336    if type(t) == \"table\" then
 337       ts = \"\"
 338       for k,v in pairs(t) do
 339          if type(v) == \"table\" then
 340             ts = ts .. indent .. t2s(k,indent .. \"  \") .. \" = \\n\" ..
 341                t2s(v, indent .. \"  \")
 342          else
 343             ts = ts .. indent .. t2s(k,indent .. \"  \") .. \" = \" ..
 344                t2s(v, indent .. \"  \") .. \"\\n\"
 345          end
 346       end
 347       return ts
 348    else
 349       return tostring(t)
 350    end
 351 end
 352 "
 353                   (concat "fd:write(_))
 354 fd:close()"
 355                           (org-babel-process-file-name tmp-file 'noquote)))
 356                (list (format "fd=io.open(\"%s\", \"w\")
 357 fd:write( _ )
 358 fd:close()"
 359                              (org-babel-process-file-name tmp-file
 360                                                           'noquote)))))))
 361          (input-body (lambda (body)
 362                        (mapc (lambda (line) (insert line) (funcall send-wait))
 363                              (split-string body "[\r\n]"))
 364                        (funcall send-wait)))
 365          (results
 366           (pcase result-type
 367             (`output
 368              (mapconcat
 369               #'org-trim
 370               (butlast
 371                (org-babel-comint-with-output
 372                    (session org-babel-lua-eoe-indicator t body)
 373                  (funcall input-body body)
 374                  (funcall send-wait) (funcall send-wait)
 375                  (insert org-babel-lua-eoe-indicator)
 376                  (funcall send-wait))
 377                2) "\n"))
 378             (`value
 379              (let ((tmp-file (org-babel-temp-file "lua-")))
 380                (org-babel-comint-with-output
 381                    (session org-babel-lua-eoe-indicator nil body)
 382                  (let ((comint-process-echoes nil))
 383                    (funcall input-body body)
 384                    (funcall dump-last-value tmp-file
 385                             (member "pp" result-params))
 386                    (funcall send-wait) (funcall send-wait)
 387                    (insert org-babel-lua-eoe-indicator)
 388                    (funcall send-wait)))
 389                (org-babel-eval-read-file tmp-file))))))
 390     (unless (string= (substring org-babel-lua-eoe-indicator 1 -1) results)
 391       (org-babel-result-cond result-params
 392         results
 393         (org-babel-lua-table-or-string results)))))
 394
 395 (defun org-babel-lua-read-string (string)
 396   "Strip 's from around Lua string."
 397   (org-unbracket-string "'" "'" string))
 398
 399 (provide 'ob-lua)
 400
 401
 402
 403 ;;; ob-lua.el ends here