lisp/ob-sh.el

   1 ;;; ob-sh.el --- org-babel functions for shell evaluation
   2
   3 ;; Copyright (C) 2009-2013 Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   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 ;;; Commentary:
  25
  26 ;; Org-Babel support for evaluating shell source code.
  27
  28 ;;; Code:
  29 (require 'ob)
  30 (require 'shell)
  31 (eval-when-compile (require 'cl))
  32
  33 (declare-function org-babel-comint-in-buffer "ob-comint" (buffer &rest body))
  34 (declare-function org-babel-comint-wait-for-output "ob-comint" (buffer))
  35 (declare-function org-babel-comint-buffer-livep "ob-comint" (buffer))
  36 (declare-function org-babel-comint-with-output "ob-comint" (meta &rest body))
  37 (declare-function orgtbl-to-generic "org-table" (table params))
  38
  39 (defvar org-babel-default-header-args:sh '())
  40
  41 (defvar org-babel-sh-command "sh"
  42   "Command used to invoke a shell.
  43 This will be passed to  `shell-command-on-region'")
  44
  45 (defcustom org-babel-sh-var-quote-fmt
  46   "$(cat <<'BABEL_TABLE'\n%s\nBABEL_TABLE\n)"
  47   "Format string used to escape variables when passed to shell scripts."
  48   :group 'org-babel
  49   :type 'string)
  50
  51 (defun org-babel-execute:sh (body params)
  52   "Execute a block of Shell commands with Babel.
  53 This function is called by `org-babel-execute-src-block'."
  54   (let* ((session (org-babel-sh-initiate-session
  55                    (cdr (assoc :session params))))
  56          (stdin ((lambda (stdin) (when stdin (org-babel-sh-var-to-string
  57                                               (org-babel-ref-resolve stdin))))
  58                  (cdr (assoc :stdin params))))
  59          (full-body (org-babel-expand-body:generic
  60                      body params (org-babel-variable-assignments:sh params))))
  61     (org-babel-reassemble-table
  62      (org-babel-sh-evaluate session full-body params stdin)
  63      (org-babel-pick-name
  64       (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
  65      (org-babel-pick-name
  66       (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
  67
  68 (defun org-babel-prep-session:sh (session params)
  69   "Prepare SESSION according to the header arguments specified in PARAMS."
  70   (let* ((session (org-babel-sh-initiate-session session))
  71          (var-lines (org-babel-variable-assignments:sh params)))
  72     (org-babel-comint-in-buffer session
  73       (mapc (lambda (var)
  74               (insert var) (comint-send-input nil t)
  75               (org-babel-comint-wait-for-output session)) var-lines))
  76     session))
  77
  78 (defun org-babel-load-session:sh (session body params)
  79   "Load BODY into SESSION."
  80   (save-window-excursion
  81     (let ((buffer (org-babel-prep-session:sh session params)))
  82       (with-current-buffer buffer
  83         (goto-char (process-mark (get-buffer-process (current-buffer))))
  84         (insert (org-babel-chomp body)))
  85       buffer)))
  86
  87 ;; helper functions
  88
  89 (defun org-babel-variable-assignments:sh (params)
  90   "Return list of shell statements assigning the block's variables."
  91   (let ((sep (cdr (assoc :separator params))))
  92     (mapcar
  93      (lambda (pair)
  94        (format "%s=%s"
  95                (car pair)
  96                (org-babel-sh-var-to-sh (cdr pair) sep)))
  97      (mapcar #'cdr (org-babel-get-header params :var)))))
  98
  99 (defun org-babel-sh-var-to-sh (var &optional sep)
 100   "Convert an elisp value to a shell variable.
 101 Convert an elisp var into a string of shell commands specifying a
 102 var of the same value."
 103   (format org-babel-sh-var-quote-fmt (org-babel-sh-var-to-string var sep)))
 104
 105 (defun org-babel-sh-var-to-string (var &optional sep)
 106   "Convert an elisp value to a string."
 107   (let ((echo-var (lambda (v) (if (stringp v) v (format "%S" v)))))
 108     (cond
 109      ((and (listp var) (listp (car var)))
 110       (orgtbl-to-generic var  (list :sep (or sep "\t") :fmt echo-var)))
 111      ((listp var)
 112       (mapconcat echo-var var "\n"))
 113      (t (funcall echo-var var)))))
 114
 115 (defun org-babel-sh-table-or-results (results)
 116   "Convert RESULTS to an appropriate elisp value.
 117 If the results look like a table, then convert them into an
 118 Emacs-lisp table, otherwise return the results as a string."
 119   (org-babel-script-escape results))
 120
 121 (defun org-babel-sh-initiate-session (&optional session params)
 122   "Initiate a session named SESSION according to PARAMS."
 123   (when (and session (not (string= session "none")))
 124     (save-window-excursion
 125       (or (org-babel-comint-buffer-livep session)
 126           (progn (shell session) (get-buffer (current-buffer)))))))
 127
 128 (defvar org-babel-sh-eoe-indicator "echo 'org_babel_sh_eoe'"
 129   "String to indicate that evaluation has completed.")
 130 (defvar org-babel-sh-eoe-output "org_babel_sh_eoe"
 131   "String to indicate that evaluation has completed.")
 132
 133 (defun org-babel-sh-evaluate (session body &optional params stdin)
 134   "Pass BODY to the Shell process in BUFFER.
 135 If RESULT-TYPE equals 'output then return a list of the outputs
 136 of the statements in BODY, if RESULT-TYPE equals 'value then
 137 return the value of the last statement in BODY."
 138   ((lambda (results)
 139      (when results
 140        (let ((result-params (cdr (assoc :result-params params))))
 141          (org-babel-result-cond result-params
 142            results
 143            (let ((tmp-file (org-babel-temp-file "sh-")))
 144              (with-temp-file tmp-file (insert results))
 145              (org-babel-import-elisp-from-file tmp-file))))))
 146    (cond
 147     (stdin                              ; external shell script w/STDIN
 148      (let ((script-file (org-babel-temp-file "sh-script-"))
 149            (stdin-file (org-babel-temp-file "sh-stdin-"))
 150            (shebang (cdr (assoc :shebang params)))
 151            (padline (not (string= "no" (cdr (assoc :padline params))))))
 152        (with-temp-file script-file
 153          (when shebang (insert (concat shebang "\n")))
 154          (when padline (insert "\n"))
 155          (insert body))
 156        (set-file-modes script-file #o755)
 157        (with-temp-file stdin-file (insert stdin))
 158        (with-temp-buffer
 159          (call-process-shell-command
 160           (if shebang
 161               script-file
 162             (format "%s %s" org-babel-sh-command script-file))
 163           stdin-file
 164           (current-buffer))
 165          (buffer-string))))
 166     (session                            ; session evaluation
 167      (mapconcat
 168       #'org-babel-sh-strip-weird-long-prompt
 169       (mapcar
 170        #'org-babel-trim
 171        (butlast
 172         (org-babel-comint-with-output
 173             (session org-babel-sh-eoe-output t body)
 174           (mapc
 175            (lambda (line)
 176              (insert line)
 177              (comint-send-input nil t)
 178              (while (save-excursion
 179                       (goto-char comint-last-input-end)
 180                       (not (re-search-forward
 181                             comint-prompt-regexp nil t)))
 182                (accept-process-output (get-buffer-process (current-buffer)))))
 183            (append
 184             (split-string (org-babel-trim body) "\n")
 185             (list org-babel-sh-eoe-indicator))))
 186         2)) "\n"))
 187     ('otherwise                         ; external shell script
 188      (if (and (cdr (assoc :shebang params))
 189               (> (length (cdr (assoc :shebang params))) 0))
 190          (let ((script-file (org-babel-temp-file "sh-script-"))
 191                (shebang (cdr (assoc :shebang params)))
 192                (padline (not (string= "no" (cdr (assoc :padline params))))))
 193            (with-temp-file script-file
 194              (when shebang (insert (concat shebang "\n")))
 195              (when padline (insert "\n"))
 196              (insert body))
 197            (set-file-modes script-file #o755)
 198            (org-babel-eval script-file ""))
 199        (org-babel-eval org-babel-sh-command (org-babel-trim body)))))))
 200
 201 (defun org-babel-sh-strip-weird-long-prompt (string)
 202   "Remove prompt cruft from a string of shell output."
 203   (while (string-match "^% +[\r\n$]+ *" string)
 204     (setq string (substring string (match-end 0))))
 205   string)
 206
 207 (provide 'ob-sh)
 208
 209
 210
 211 ;;; ob-sh.el ends here