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128 lines
4.5 KiB
EmacsLisp
128 lines
4.5 KiB
EmacsLisp
;;; org-babel-perl.el --- org-babel functions for perl evaluation
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;; Copyright (C) 2009 Dan Davison, Eric Schulte
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;; Author: Dan Davison, Eric Schulte
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;; Keywords: literate programming, reproducible research
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;; Homepage: http://orgmode.org
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;; Version: 0.01
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;;; License:
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;; This program 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, or (at your option)
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;; any later version.
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;;
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;; This program 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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;;
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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;; Boston, MA 02110-1301, USA.
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;;; Commentary:
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;; Org-Babel support for evaluating perl source code.
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;;; Code:
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(require 'org-babel)
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(org-babel-add-interpreter "perl")
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(add-to-list 'org-babel-tangle-langs '("perl" "pl" "#!/usr/bin/env perl"))
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(defun org-babel-execute:perl (body params)
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"Execute a block of Perl code with org-babel. This function is
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called by `org-babel-execute-src-block'."
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(message "executing Perl source code block")
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(let* ((processed-params (org-babel-process-params params))
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(session (first processed-params))
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(vars (second processed-params))
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(result-params (third processed-params))
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(result-type (fourth processed-params))
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(full-body (concat
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(mapconcat ;; define any variables
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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-perl-var-to-perl (cdr pair))))
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vars "\n") "\n" (org-babel-trim body) "\n")) ;; then the source block body
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(session (org-babel-perl-initiate-session session)))
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(org-babel-perl-evaluate session full-body result-type)))
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(defun org-babel-prep-session:perl (session params)
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"Prepare SESSION according to the header arguments specified in PARAMS."
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(error "Sessions are not supported for Perl."))
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;; helper functions
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(defun org-babel-perl-var-to-perl (var)
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"Convert an elisp var into a string of perl source code
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specifying a var of the same value."
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(if (listp var)
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(concat "[" (mapconcat #'org-babel-perl-var-to-perl var ", ") "]")
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(format "%S" var)))
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(defvar org-babel-perl-buffers '(:default . nil))
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(defun org-babel-perl-initiate-session (&optional session)
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"Simply return nil, as sessions are not supported by perl"
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nil)
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(defvar org-babel-perl-wrapper-method
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"
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sub main {
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%s
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}
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@r = main;
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open(o, \">%s\");
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print o join(\"\\n\", @r), \"\\n\"")
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(defvar org-babel-perl-pp-wrapper-method
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nil)
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(defun org-babel-perl-evaluate (session body &optional result-type)
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"Pass BODY to the Perl process in SESSION. If RESULT-TYPE equals
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'output then return a list of the outputs of the statements in
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BODY, 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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(if (not session)
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;; external process evaluation
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(save-window-excursion
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(case result-type
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(output
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(with-temp-buffer
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(insert body)
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;; (message "buffer=%s" (buffer-string)) ;; debugging
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(shell-command-on-region (point-min) (point-max) "perl" 'replace)
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(buffer-string)))
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(value
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(let ((tmp-file (make-temp-file "perl-functional-results")))
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(with-temp-buffer
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(insert
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(format
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(if (member "pp" result-params)
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(error "Pretty-printing not implemented for perl")
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org-babel-perl-wrapper-method)
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(let ((lines (split-string
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(org-remove-indentation (org-babel-trim body)) "[\r\n]")))
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(concat
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(mapconcat #'identity (butlast lines) "\n")
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(format "\nreturn %s" (car (last lines)))))
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tmp-file))
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;; (message "buffer=%s" (buffer-string)) ;; debugging
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(shell-command-on-region (point-min) (point-max) "perl"))
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(let ((raw (with-temp-buffer (insert-file-contents tmp-file) (buffer-string))))
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(if (or (member "code" result-params) (member "pp" result-params))
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raw
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(org-babel-import-elisp-from-file tmp-file)))))))
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;; comint session evaluation
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(error "Sessions are not supported for Perl.")))
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(provide 'org-babel-perl)
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;;; org-babel-perl.el ends here
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