lisp/ob-sh.el

   1 ;;; ob-sh.el --- org-babel functions for shell evaluation
   2
   3 ;; Copyright (C) 2009, 2010  Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research
   7 ;; Homepage: http://orgmode.org
   8 ;; Version: 7.01trans
   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 ;;; Commentary:
  26
  27 ;; Org-Babel support for evaluating shell source code.
  28
  29 ;;; Code:
  30 (require 'ob)
  31 (require 'ob-comint)
  32 (require 'ob-eval)
  33 (require 'shell)
  34 (eval-when-compile (require 'cl))
  35
  36 (declare-function org-babel-ref-variables "ob-ref" (params))
  37 (declare-function org-babel-comint-in-buffer "ob-comint" (buffer &rest body))
  38 (declare-function org-babel-comint-wait-for-output "ob-comint" (buffer))
  39 (declare-function org-babel-comint-buffer-livep "ob-comint" (buffer))
  40 (declare-function org-babel-comint-with-output "ob-comint" (meta &rest body))
  41 (declare-function orgtbl-to-generic "org-table" (table params))
  42
  43 (defvar org-babel-default-header-args:sh '())
  44
  45 (defvar org-babel-sh-command "sh"
  46   "Command used to invoke a shell.
  47 This will be passed to  `shell-command-on-region'")
  48
  49 (defun org-babel-expand-body:sh (body params &optional processed-params)
  50   "Expand BODY according to PARAMS, return the expanded body."
  51   (let ((vars (nth 1 (or processed-params (org-babel-process-params params))))
  52         (sep (cdr (assoc :separator params))))
  53     (concat
  54    (mapconcat ;; define any variables
  55     (lambda (pair)
  56       (format "%s=%s"
  57               (car pair)
  58               (org-babel-sh-var-to-sh (cdr pair) sep)))
  59     vars "\n") "\n" body "\n\n")))
  60
  61 (defun org-babel-execute:sh (body params)
  62   "Execute a block of Shell commands with Babel.
  63 This function is called by `org-babel-execute-src-block'."
  64   (let* ((processed-params (org-babel-process-params params))
  65          (session (org-babel-sh-initiate-session (nth 0 processed-params)))
  66          (result-params (nth 2 processed-params))
  67          (full-body (org-babel-expand-body:sh
  68                      body params processed-params)))
  69     (org-babel-reassemble-table
  70      (org-babel-sh-evaluate session full-body result-params)
  71      (org-babel-pick-name
  72       (nth 4 processed-params) (cdr (assoc :colnames params)))
  73      (org-babel-pick-name
  74       (nth 5 processed-params) (cdr (assoc :rownames params))))))
  75
  76 (defun org-babel-prep-session:sh (session params)
  77   "Prepare SESSION according to the header arguments specified in PARAMS."
  78   (let* ((session (org-babel-sh-initiate-session session))
  79          (vars (org-babel-ref-variables params))
  80          (sep (cdr (assoc :separator params)))
  81          (var-lines (mapcar ;; define any variables
  82                      (lambda (pair)
  83                        (format "%s=%s"
  84                                (car pair)
  85                                (org-babel-sh-var-to-sh (cdr pair) sep)))
  86                      vars)))
  87     (org-babel-comint-in-buffer session
  88       (mapc (lambda (var)
  89               (insert var) (comint-send-input nil t)
  90               (org-babel-comint-wait-for-output session)) var-lines))
  91     session))
  92
  93 (defun org-babel-load-session:sh (session body params)
  94   "Load BODY into SESSION."
  95   (save-window-excursion
  96     (let ((buffer (org-babel-prep-session:sh session params)))
  97       (with-current-buffer buffer
  98         (goto-char (process-mark (get-buffer-process (current-buffer))))
  99         (insert (org-babel-chomp body)))
 100       buffer)))
 101
 102 ;; helper functions
 103
 104 (defun org-babel-sh-var-to-sh (var &optional sep)
 105   "Convert an elisp value to a shell variable.
 106 Convert an elisp var into a string of shell commands specifying a
 107 var of the same value."
 108   (if (listp var)
 109       (flet ((deep-string (el)
 110                           (if (listp el)
 111                               (mapcar #'deep-string el)
 112                             (org-babel-sh-var-to-sh el sep))))
 113         (format "$(cat <<BABEL_TABLE\n%s\nBABEL_TABLE\n)"
 114                 (orgtbl-to-generic
 115                  (deep-string var) (list :sep (or sep "\t")))))
 116     (if (stringp var)
 117         (if (string-match "[\n\r]" var)
 118             (format "$(cat <<BABEL_STRING\n%s\nBABEL_STRING\n)" var)
 119           (format "%s" var))
 120       (format "%S" var))))
 121
 122 (defun org-babel-sh-table-or-results (results)
 123   "Convert RESULTS to an appropriate elisp value.
 124 If the results look like a table, then convert them into an
 125 Emacs-lisp table, otherwise return the results as a string."
 126   (org-babel-read
 127    (if (string-match "^\\[.+\\]$" results)
 128        (org-babel-read
 129         (concat "'"
 130                 (replace-regexp-in-string
 131                  "\\[" "(" (replace-regexp-in-string
 132                             "\\]" ")" (replace-regexp-in-string
 133                                        ", " " " (replace-regexp-in-string
 134                                                  "'" "\"" results))))))
 135      results)))
 136
 137 (defun org-babel-sh-initiate-session (&optional session params)
 138   "Initiate a session named SESSION according to PARAMS."
 139   (when (and session (not (string= session "none")))
 140     (save-window-excursion
 141       (or (org-babel-comint-buffer-livep session)
 142           (progn (shell session) (get-buffer (current-buffer)))))))
 143
 144 (defvar org-babel-sh-eoe-indicator "echo 'org_babel_sh_eoe'"
 145   "String to indicate that evaluation has completed.")
 146 (defvar org-babel-sh-eoe-output "org_babel_sh_eoe"
 147   "String to indicate that evaluation has completed.")
 148
 149 (defun org-babel-sh-evaluate (session body &optional result-params)
 150   "Pass BODY to the Shell process in BUFFER.
 151 If RESULT-TYPE equals 'output then return a list of the outputs
 152 of the statements in BODY, if RESULT-TYPE equals 'value then
 153 return the value of the last statement in BODY."
 154   ((lambda (results)
 155      (if (or (member "scalar" result-params)
 156              (member "output" result-params))
 157          results
 158        (let ((tmp-file (make-temp-file "org-babel-sh")))
 159          (with-temp-file tmp-file (insert results))
 160          (org-babel-import-elisp-from-file tmp-file))))
 161    (if (not session)
 162        (org-babel-eval org-babel-sh-command (org-babel-trim body))
 163      (let ((tmp-file (make-temp-file "org-babel-sh")))
 164        (mapconcat
 165         #'org-babel-sh-strip-weird-long-prompt
 166         (mapcar
 167          #'org-babel-trim
 168          (butlast
 169           (org-babel-comint-with-output
 170               (session org-babel-sh-eoe-output t body)
 171             (mapc
 172              (lambda (line)
 173                (insert line) (comint-send-input nil t) (sleep-for 0.25))
 174              (append
 175               (split-string (org-babel-trim body) "\n")
 176               (list org-babel-sh-eoe-indicator))))
 177           2)) "\n")))))
 178
 179 (defun org-babel-sh-strip-weird-long-prompt (string)
 180   "Remove prompt cruft from a string of shell output."
 181   (while (string-match "^% +[\r\n$]+ *" string)
 182     (setq string (substring string (match-end 0))))
 183   string)
 184
 185 (provide 'ob-sh)
 186
 187 ;; arch-tag: 416dd531-c230-4b0a-a5bf-8d948f990f2d
 188
 189 ;;; ob-sh.el ends here