org-mode/contrib/babel/lisp/langs/org-babel-sh.el

158 lines
6.5 KiB
EmacsLisp

;;; org-babel-sh.el --- org-babel functions for shell evaluation
;; Copyright (C) 2009 Eric Schulte
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research
;; Homepage: http://orgmode.org
;; Version: 0.01
;;; License:
;; This program is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 3, or (at your option)
;; any later version.
;;
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;;
;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;; Org-Babel support for evaluating shell source code.
;;; Code:
(require 'org-babel)
(require 'shell)
(org-babel-add-interpreter "sh")
(add-to-list 'org-babel-tangle-langs '("sh" "sh" "#!/usr/bin/env sh"))
(defun org-babel-execute:sh (body params)
"Execute a block of Shell commands with org-babel. This
function is called by `org-babel-execute-src-block'."
(message "executing Shell source code block")
(let* ((processed-params (org-babel-process-params params))
(session (org-babel-sh-initiate-session (first processed-params)))
(vars (second processed-params))
(result-type (fourth processed-params))
(full-body (concat
(mapconcat ;; define any variables
(lambda (pair)
(format "%s=%s"
(car pair)
(org-babel-sh-var-to-sh (cdr pair))))
vars "\n") "\n" body "\n\n"))) ;; then the source block body
(org-babel-sh-evaluate session full-body result-type)))
(defun org-babel-prep-session:sh (session params)
"Prepare SESSION according to the header arguments specified in PARAMS."
(let* ((session (org-babel-sh-initiate-session session))
(vars (org-babel-ref-variables params))
(var-lines (mapcar ;; define any variables
(lambda (pair)
(format "%s=%s"
(car pair)
(org-babel-sh-var-to-sh (cdr pair))))
vars)))
(org-babel-comint-in-buffer session
(mapc (lambda (var)
(insert var) (comint-send-input nil t)
(org-babel-comint-wait-for-output session)) var-lines))))
;; helper functions
(defun org-babel-sh-var-to-sh (var)
"Convert an elisp var into a string of shell commands
specifying a var of the same value."
(if (listp var)
(concat "[" (mapconcat #'org-babel-sh-var-to-sh var ", ") "]")
(format "%S" var)))
(defun org-babel-sh-table-or-results (results)
"If the results look like a table, then convert them into an
Emacs-lisp table, otherwise return the results as a string."
(org-babel-read
(if (string-match "^\\[.+\\]$" results)
(org-babel-read
(replace-regexp-in-string
"\\[" "(" (replace-regexp-in-string
"\\]" ")" (replace-regexp-in-string
", " " " (replace-regexp-in-string
"'" "\"" results)))))
results)))
(defun org-babel-sh-initiate-session (&optional session)
(unless (string= session "none")
(save-window-excursion
(or (org-babel-comint-buffer-livep session)
(progn (shell session) (get-buffer (current-buffer)))))))
(defvar org-babel-sh-eoe-indicator "echo 'org_babel_sh_eoe'"
"Used to indicate that evaluation is has completed.")
(defvar org-babel-sh-eoe-output "org_babel_sh_eoe"
"Used to indicate that evaluation is has completed.")
(defun org-babel-sh-evaluate (session body &optional result-type)
"Pass BODY to the Shell process in BUFFER. If RESULT-TYPE equals
'output then return a list of the outputs of the statements in
BODY, if RESULT-TYPE equals 'value then return the value of the
last statement in BODY."
(if (not session)
;; external process evaluation
(save-window-excursion
(with-temp-buffer
(insert body)
;; (message "buffer=%s" (buffer-string)) ;; debugging
(shell-command-on-region (point-min) (point-max) "sh" 'replace)
(case result-type
(output (buffer-string))
(value ;; TODO: figure out how to return non-output values from shell scripts
(let ((tmp-file (make-temp-file "org-babel-sh"))
(results (buffer-string)))
(with-temp-file tmp-file (insert results))
(org-babel-import-elisp-from-file tmp-file))))))
;; comint session evaluation
(flet ((strip-empty (lst)
(delq nil (mapcar (lambda (el) (unless (= (length el) 0) el)) lst))))
(let ((tmp-file (make-temp-file "org-babel-sh"))
(results
(cdr (member
org-babel-sh-eoe-output
(strip-empty
(reverse
(mapcar #'org-babel-sh-strip-weird-long-prompt
(mapcar #'org-babel-trim
(org-babel-comint-with-output
session org-babel-sh-eoe-output t
(mapc (lambda (line) (insert line) (comint-send-input))
(strip-empty (split-string body "\n")))
(insert org-babel-sh-eoe-indicator)
(comint-send-input))))))))))
;; (message (replace-regexp-in-string
;; "%" "%%" (format "processed-results=%S" results))) ;; debugging
(or (and results
(case result-type
(output (org-babel-trim (mapconcat #'org-babel-trim
(reverse results) "\n")))
(value (with-temp-file tmp-file
(insert (car results)) (insert "\n"))
(org-babel-import-elisp-from-file tmp-file))))
"")))))
(defun org-babel-sh-strip-weird-long-prompt (string)
(while (string-match "^% +[\r\n$]+ *" string)
(setq string (substring string (match-end 0))))
string)
(provide 'org-babel-sh)
;;; org-babel-sh.el ends here