;;; ob-lua.el --- Org Babel functions for Lua evaluation -*- lexical-binding: t; -*-
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;; Copyright (C) 2014, 2016-2018 Free Software Foundation, Inc.
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;; Authors: Dieter Schoen
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;; Keywords: literate programming, reproducible research
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;; Homepage: https://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;; Requirements:
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;; for session support, lua-mode is needed.
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;; lua-mode is not part of GNU Emacs/orgmode, but can be obtained
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;; from marmalade or melpa.
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;; The source repository is here:
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;; https://github.com/immerrr/lua-mode
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;; However, sessions are not yet working.
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;; Org-Babel support for evaluating lua source code.
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;;; Code:
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(require 'ob)
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(require 'cl-lib)
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(declare-function org-remove-indentation "org" (code &optional n))
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(declare-function org-trim "org" (s &optional keep-lead))
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(declare-function lua-shell "ext:lua-mode" (&optional argprompt))
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(declare-function lua-toggle-shells "ext:lua-mode" (arg))
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(declare-function run-lua "ext:lua" (cmd &optional dedicated show))
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(defvar org-babel-tangle-lang-exts)
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(add-to-list 'org-babel-tangle-lang-exts '("lua" . "lua"))
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(defvar org-babel-default-header-args:lua '())
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(defcustom org-babel-lua-command "lua"
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"Name of the command for executing Lua code."
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:version "26.1"
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:package-version '(Org . "8.3")
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:group 'org-babel
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:type 'string)
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(defcustom org-babel-lua-mode 'lua-mode
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"Preferred lua mode for use in running lua interactively.
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This will typically be 'lua-mode."
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:group 'org-babel
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:version "26.1"
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:package-version '(Org . "8.3")
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:type 'symbol)
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(defcustom org-babel-lua-hline-to "None"
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"Replace hlines in incoming tables with this when translating to lua."
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:group 'org-babel
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:version "26.1"
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:package-version '(Org . "8.3")
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:type 'string)
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(defcustom org-babel-lua-None-to 'hline
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"Replace 'None' in lua tables with this before returning."
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:group 'org-babel
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:version "26.1"
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:package-version '(Org . "8.3")
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:type 'symbol)
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(defun org-babel-execute:lua (body params)
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"Execute a block of Lua code with Babel.
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This function is called by `org-babel-execute-src-block'."
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(let* ((session (org-babel-lua-initiate-session
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(cdr (assq :session params))))
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(result-params (cdr (assq :result-params params)))
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(result-type (cdr (assq :result-type params)))
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(return-val (when (and (eq result-type 'value) (not session))
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(cdr (assq :return params))))
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(preamble (cdr (assq :preamble params)))
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(full-body
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(org-babel-expand-body:generic
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(concat body (if return-val (format "\nreturn %s" return-val) ""))
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params (org-babel-variable-assignments:lua params)))
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(result (org-babel-lua-evaluate
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session full-body result-type result-params preamble)))
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(org-babel-reassemble-table
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result
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(org-babel-pick-name (cdr (assq :colname-names params))
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(cdr (assq :colnames params)))
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(org-babel-pick-name (cdr (assq :rowname-names params))
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(cdr (assq :rownames params))))))
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(defun org-babel-prep-session:lua (session params)
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"Prepare SESSION according to the header arguments in PARAMS.
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VARS contains resolved variable references"
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(let* ((session (org-babel-lua-initiate-session session))
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(var-lines
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(org-babel-variable-assignments:lua params)))
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(org-babel-comint-in-buffer session
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(mapc (lambda (var)
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(end-of-line 1) (insert var) (comint-send-input)
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(org-babel-comint-wait-for-output session)) var-lines))
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session))
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(defun org-babel-load-session:lua (session body params)
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"Load BODY into SESSION."
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(save-window-excursion
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(let ((buffer (org-babel-prep-session:lua session params)))
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(with-current-buffer buffer
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(goto-char (process-mark (get-buffer-process (current-buffer))))
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(insert (org-babel-chomp body)))
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buffer)))
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;; helper functions
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(defun org-babel-variable-assignments:lua (params)
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"Return a list of Lua statements assigning the block's variables."
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(mapcar
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(lambda (pair)
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(format "%s=%s"
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(car pair)
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(org-babel-lua-var-to-lua (cdr pair))))
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(org-babel--get-vars params)))
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(defun org-babel-lua-var-to-lua (var)
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"Convert an elisp value to a lua variable.
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Convert an elisp value, VAR, into a string of lua source code
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specifying a variable of the same value."
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(if (listp var)
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(if (and (= 1 (length var)) (not (listp (car var))))
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(org-babel-lua-var-to-lua (car var))
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(if (and
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(= 2 (length var))
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(not (listp (car var))))
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(concat
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(substring-no-properties (car var))
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"="
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(org-babel-lua-var-to-lua (cdr var)))
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(concat "{" (mapconcat #'org-babel-lua-var-to-lua var ", ") "}")))
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(if (eq var 'hline)
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org-babel-lua-hline-to
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(format
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(if (and (stringp var) (string-match "[\n\r]" var)) "\"\"%S\"\"" "%S")
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(if (stringp var) (substring-no-properties var) var)))))
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(defun org-babel-lua-table-or-string (results)
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"Convert RESULTS into an appropriate elisp value.
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If the results look like a list or tuple, then convert them into an
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Emacs-lisp table, otherwise return the results as a string."
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(let ((res (org-babel-script-escape results)))
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(if (listp res)
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(mapcar (lambda (el) (if (eq el 'None)
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org-babel-lua-None-to el))
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res)
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res)))
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(defvar org-babel-lua-buffers '((:default . "*Lua*")))
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(defun org-babel-lua-session-buffer (session)
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"Return the buffer associated with SESSION."
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(cdr (assoc session org-babel-lua-buffers)))
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(defun org-babel-lua-with-earmuffs (session)
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(let ((name (if (stringp session) session (format "%s" session))))
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(if (and (string= "*" (substring name 0 1))
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(string= "*" (substring name (- (length name) 1))))
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name
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(format "*%s*" name))))
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(defun org-babel-lua-without-earmuffs (session)
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(let ((name (if (stringp session) session (format "%s" session))))
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(if (and (string= "*" (substring name 0 1))
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(string= "*" (substring name (- (length name) 1))))
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(substring name 1 (- (length name) 1))
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name)))
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(defvar lua-default-interpreter)
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(defvar lua-which-bufname)
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(defvar lua-shell-buffer-name)
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(defun org-babel-lua-initiate-session-by-key (&optional session)
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"Initiate a lua session.
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If there is not a current inferior-process-buffer in SESSION
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then create. Return the initialized session."
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;; (require org-babel-lua-mode)
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(save-window-excursion
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(let* ((session (if session (intern session) :default))
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(lua-buffer (org-babel-lua-session-buffer session))
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;; (cmd (if (member system-type '(cygwin windows-nt ms-dos))
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;; (concat org-babel-lua-command " -i")
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;; org-babel-lua-command))
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)
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(cond
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((and (eq 'lua-mode org-babel-lua-mode)
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(fboundp 'lua-start-process)) ; lua-mode.el
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;; Make sure that lua-which-bufname is initialized, as otherwise
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;; it will be overwritten the first time a Lua buffer is
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;; created.
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;;(lua-toggle-shells lua-default-interpreter)
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;; `lua-shell' creates a buffer whose name is the value of
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;; `lua-which-bufname' with '*'s at the beginning and end
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(let* ((bufname (if (and lua-buffer (buffer-live-p lua-buffer))
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(replace-regexp-in-string ;; zap surrounding *
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"^\\*\\([^*]+\\)\\*$" "\\1" (buffer-name lua-buffer))
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(concat "Lua-" (symbol-name session))))
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(lua-which-bufname bufname))
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(lua-start-process)
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(setq lua-buffer (org-babel-lua-with-earmuffs bufname))))
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(t
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(error "No function available for running an inferior Lua")))
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(setq org-babel-lua-buffers
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(cons (cons session lua-buffer)
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(assq-delete-all session org-babel-lua-buffers)))
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session)))
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(defun org-babel-lua-initiate-session (&optional session _params)
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"Create a session named SESSION according to PARAMS."
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(unless (string= session "none")
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(error "Sessions currently not supported, work in progress")
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(org-babel-lua-session-buffer
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(org-babel-lua-initiate-session-by-key session))))
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(defvar org-babel-lua-eoe-indicator "--eoe"
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"A string to indicate that evaluation has completed.")
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(defvar org-babel-lua-wrapper-method
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"
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function main()
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%s
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end
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fd=io.open(\"%s\", \"w\")
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fd:write( main() )
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fd:close()")
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(defvar org-babel-lua-pp-wrapper-method
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"
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-- table to string
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function t2s(t, indent)
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if indent == nil then
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indent = \"\"
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end
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if type(t) == \"table\" then
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ts = \"\"
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for k,v in pairs(t) do
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if type(v) == \"table\" then
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ts = ts .. indent .. t2s(k,indent .. \" \") .. \" = \\n\" ..
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t2s(v, indent .. \" \")
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else
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ts = ts .. indent .. t2s(k,indent .. \" \") .. \" = \" ..
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t2s(v, indent .. \" \") .. \"\\n\"
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end
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end
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return ts
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else
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return tostring(t)
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end
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end
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function main()
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%s
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end
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fd=io.open(\"%s\", \"w\")
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fd:write(t2s(main()))
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fd:close()")
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(defun org-babel-lua-evaluate
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(session body &optional result-type result-params preamble)
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"Evaluate BODY as Lua code."
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(if session
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(org-babel-lua-evaluate-session
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session body result-type result-params)
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(org-babel-lua-evaluate-external-process
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body result-type result-params preamble)))
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(defun org-babel-lua-evaluate-external-process
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(body &optional result-type result-params preamble)
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"Evaluate BODY in external lua process.
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If RESULT-TYPE equals 'output then return standard output as a
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string. If RESULT-TYPE equals 'value then return the value of the
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last statement in BODY, as elisp."
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(let ((raw
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(pcase result-type
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(`output (org-babel-eval org-babel-lua-command
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(concat (if preamble (concat preamble "\n"))
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body)))
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(`value (let ((tmp-file (org-babel-temp-file "lua-")))
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(org-babel-eval
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org-babel-lua-command
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(concat
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(if preamble (concat preamble "\n") "")
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(format
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(if (member "pp" result-params)
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org-babel-lua-pp-wrapper-method
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org-babel-lua-wrapper-method)
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(mapconcat
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(lambda (line) (format "\t%s" line))
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(split-string
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(org-remove-indentation
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(org-trim body))
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"[\r\n]") "\n")
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(org-babel-process-file-name tmp-file 'noquote))))
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(org-babel-eval-read-file tmp-file))))))
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(org-babel-result-cond result-params
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raw
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(org-babel-lua-table-or-string (org-trim raw)))))
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(defun org-babel-lua-evaluate-session
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(session body &optional result-type result-params)
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"Pass BODY to the Lua process in SESSION.
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If RESULT-TYPE equals 'output then return standard output as a
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string. If RESULT-TYPE equals 'value then return the value of the
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last statement in BODY, as elisp."
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(let* ((send-wait (lambda () (comint-send-input nil t) (sleep-for 0 5)))
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(dump-last-value
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(lambda
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(tmp-file pp)
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(mapc
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(lambda (statement) (insert statement) (funcall send-wait))
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(if pp
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(list
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"-- table to string
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function t2s(t, indent)
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if indent == nil then
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indent = \"\"
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end
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if type(t) == \"table\" then
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ts = \"\"
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for k,v in pairs(t) do
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if type(v) == \"table\" then
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ts = ts .. indent .. t2s(k,indent .. \" \") .. \" = \\n\" ..
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t2s(v, indent .. \" \")
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else
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ts = ts .. indent .. t2s(k,indent .. \" \") .. \" = \" ..
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t2s(v, indent .. \" \") .. \"\\n\"
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end
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end
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return ts
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else
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return tostring(t)
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end
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end
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"
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(concat "fd:write(_))
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fd:close()"
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(org-babel-process-file-name tmp-file 'noquote)))
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(list (format "fd=io.open(\"%s\", \"w\")
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fd:write( _ )
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fd:close()"
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(org-babel-process-file-name tmp-file
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'noquote)))))))
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(input-body (lambda (body)
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(mapc (lambda (line) (insert line) (funcall send-wait))
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(split-string body "[\r\n]"))
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(funcall send-wait)))
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(results
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(pcase result-type
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(`output
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(mapconcat
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#'org-trim
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(butlast
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(org-babel-comint-with-output
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(session org-babel-lua-eoe-indicator t body)
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(funcall input-body body)
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(funcall send-wait) (funcall send-wait)
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(insert org-babel-lua-eoe-indicator)
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(funcall send-wait))
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2) "\n"))
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(`value
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(let ((tmp-file (org-babel-temp-file "lua-")))
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(org-babel-comint-with-output
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(session org-babel-lua-eoe-indicator nil body)
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(let ((comint-process-echoes nil))
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(funcall input-body body)
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(funcall dump-last-value tmp-file
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(member "pp" result-params))
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(funcall send-wait) (funcall send-wait)
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(insert org-babel-lua-eoe-indicator)
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(funcall send-wait)))
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(org-babel-eval-read-file tmp-file))))))
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(unless (string= (substring org-babel-lua-eoe-indicator 1 -1) results)
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(org-babel-result-cond result-params
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results
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(org-babel-lua-table-or-string results)))))
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(defun org-babel-lua-read-string (string)
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"Strip 's from around Lua string."
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(org-unbracket-string "'" "'" string))
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(provide 'ob-lua)
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;;; ob-lua.el ends here
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