lisp/ob-shell.el

   1 ;;; ob-shell.el --- org-babel functions for shell evaluation
   2
   3 ;; Copyright (C) 2009-2014 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 (defcustom org-babel-sh-command shell-file-name
  42   "Command used to invoke a shell.
  43 Set by default to the value of `shell-file-name'.  This will be
  44 passed to `shell-command-on-region'"
  45   :group 'org-babel
  46   :type 'string)
  47
  48 (defcustom org-babel-sh-var-quote-fmt
  49   "$(cat <<'BABEL_TABLE'\n%s\nBABEL_TABLE\n)"
  50   "Format string used to escape variables when passed to shell scripts."
  51   :group 'org-babel
  52   :type 'string)
  53
  54 (defcustom org-babel-shell-names
  55   '("sh" "bash" "csh" "ash" "dash" "ksh" "mksh" "posh")
  56   "List of names of shell supported by babel shell code blocks."
  57   :group 'org-babel
  58   :type 'string
  59   :initialize
  60   (lambda (symbol value)
  61     (set-default symbol (second value))
  62     (mapc
  63      (lambda (name)
  64        (eval `(defun ,(intern (concat "org-babel-execute:" name)) (body params)
  65                 ,(format "Execute a block of %s commands with Babel." name)
  66                 (let ((org-babel-sh-command ,name))
  67                   (org-babel-execute:shell body params)))))
  68      (second value))))
  69
  70 (defun org-babel-execute:shell (body params)
  71   "Execute a block of Shell commands with Babel.
  72 This function is called by `org-babel-execute-src-block'."
  73   (let* ((session (org-babel-sh-initiate-session
  74                    (cdr (assoc :session params))))
  75          (stdin (let ((stdin (cdr (assoc :stdin params))))
  76                   (when stdin (org-babel-sh-var-to-string
  77                                (org-babel-ref-resolve stdin)))))
  78          (full-body (org-babel-expand-body:generic
  79                      body params (org-babel-variable-assignments:sh params))))
  80     (org-babel-reassemble-table
  81      (org-babel-sh-evaluate session full-body params stdin)
  82      (org-babel-pick-name
  83       (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
  84      (org-babel-pick-name
  85       (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
  86
  87 (defun org-babel-prep-session:sh (session params)
  88   "Prepare SESSION according to the header arguments specified in PARAMS."
  89   (let* ((session (org-babel-sh-initiate-session session))
  90          (var-lines (org-babel-variable-assignments:sh params)))
  91     (org-babel-comint-in-buffer session
  92       (mapc (lambda (var)
  93               (insert var) (comint-send-input nil t)
  94               (org-babel-comint-wait-for-output session)) var-lines))
  95     session))
  96
  97 (defun org-babel-load-session:sh (session body params)
  98   "Load BODY into SESSION."
  99   (save-window-excursion
 100     (let ((buffer (org-babel-prep-session:sh session params)))
 101       (with-current-buffer buffer
 102         (goto-char (process-mark (get-buffer-process (current-buffer))))
 103         (insert (org-babel-chomp body)))
 104       buffer)))
 105
 106 ;; helper functions
 107
 108 (defun org-babel-variable-assignments:sh (params)
 109   "Return list of shell statements assigning the block's variables."
 110   (let ((sep (cdr (assoc :separator params))))
 111     (mapcar
 112      (lambda (pair)
 113        (format "%s=%s"
 114                (car pair)
 115                (org-babel-sh-var-to-sh (cdr pair) sep)))
 116      (mapcar #'cdr (org-babel-get-header params :var)))))
 117
 118 (defun org-babel-sh-var-to-sh (var &optional sep)
 119   "Convert an elisp value to a shell variable.
 120 Convert an elisp var into a string of shell commands specifying a
 121 var of the same value."
 122   (format org-babel-sh-var-quote-fmt (org-babel-sh-var-to-string var sep)))
 123
 124 (defun org-babel-sh-var-to-string (var &optional sep)
 125   "Convert an elisp value to a string."
 126   (let ((echo-var (lambda (v) (if (stringp v) v (format "%S" v)))))
 127     (cond
 128      ((and (listp var) (or (listp (car var)) (equal (car var) 'hline)))
 129       (orgtbl-to-generic var  (list :sep (or sep "\t") :fmt echo-var)))
 130      ((listp var)
 131       (mapconcat echo-var var "\n"))
 132      (t (funcall echo-var var)))))
 133
 134 (defun org-babel-sh-table-or-results (results)
 135   "Convert RESULTS to an appropriate elisp value.
 136 If the results look like a table, then convert them into an
 137 Emacs-lisp table, otherwise return the results as a string."
 138   (org-babel-script-escape results))
 139
 140 (defun org-babel-sh-initiate-session (&optional session params)
 141   "Initiate a session named SESSION according to PARAMS."
 142   (when (and session (not (string= session "none")))
 143     (save-window-excursion
 144       (or (org-babel-comint-buffer-livep session)
 145           (progn (shell session) (get-buffer (current-buffer)))))))
 146
 147 (defvar org-babel-sh-eoe-indicator "echo 'org_babel_sh_eoe'"
 148   "String to indicate that evaluation has completed.")
 149 (defvar org-babel-sh-eoe-output "org_babel_sh_eoe"
 150   "String to indicate that evaluation has completed.")
 151
 152 (defun org-babel-sh-evaluate (session body &optional params stdin)
 153   "Pass BODY to the Shell process in BUFFER.
 154 If RESULT-TYPE equals 'output then return a list of the outputs
 155 of the statements in BODY, if RESULT-TYPE equals 'value then
 156 return the value of the last statement in BODY."
 157   (let ((results
 158          (cond
 159           (stdin                        ; external shell script w/STDIN
 160            (let ((script-file (org-babel-temp-file "sh-script-"))
 161                  (stdin-file (org-babel-temp-file "sh-stdin-"))
 162                  (shebang (cdr (assoc :shebang params)))
 163                  (padline (not (string= "no" (cdr (assoc :padline params))))))
 164              (with-temp-file script-file
 165                (when shebang (insert (concat shebang "\n")))
 166                (when padline (insert "\n"))
 167                (insert body))
 168              (set-file-modes script-file #o755)
 169              (with-temp-file stdin-file (insert stdin))
 170              (with-temp-buffer
 171                (call-process-shell-command
 172                 (if shebang
 173                     script-file
 174                   (format "%s %s" org-babel-sh-command script-file))
 175                 stdin-file
 176                 (current-buffer))
 177                (buffer-string))))
 178           (session                      ; session evaluation
 179            (mapconcat
 180             #'org-babel-sh-strip-weird-long-prompt
 181             (mapcar
 182              #'org-babel-trim
 183              (butlast
 184               (org-babel-comint-with-output
 185                   (session org-babel-sh-eoe-output t body)
 186                 (mapc
 187                  (lambda (line)
 188                    (insert line)
 189                    (comint-send-input nil t)
 190                    (while (save-excursion
 191                             (goto-char comint-last-input-end)
 192                             (not (re-search-forward
 193                                   comint-prompt-regexp nil t)))
 194                      (accept-process-output
 195                       (get-buffer-process (current-buffer)))))
 196                  (append
 197                   (split-string (org-babel-trim body) "\n")
 198                   (list org-babel-sh-eoe-indicator))))
 199               2)) "\n"))
 200           ('otherwise                   ; external shell script
 201            (if (and (cdr (assoc :shebang params))
 202                     (> (length (cdr (assoc :shebang params))) 0))
 203                (let ((script-file (org-babel-temp-file "sh-script-"))
 204                      (shebang (cdr (assoc :shebang params)))
 205                      (padline (not (equal "no" (cdr (assoc :padline params))))))
 206                  (with-temp-file script-file
 207                    (when shebang (insert (concat shebang "\n")))
 208                    (when padline (insert "\n"))
 209                    (insert body))
 210                  (set-file-modes script-file #o755)
 211                  (org-babel-eval script-file ""))
 212              (org-babel-eval org-babel-sh-command (org-babel-trim body)))))))
 213     (when results
 214       (let ((result-params (cdr (assoc :result-params params))))
 215         (org-babel-result-cond result-params
 216           results
 217           (let ((tmp-file (org-babel-temp-file "sh-")))
 218             (with-temp-file tmp-file (insert results))
 219             (org-babel-import-elisp-from-file tmp-file)))))))
 220
 221 (defun org-babel-sh-strip-weird-long-prompt (string)
 222   "Remove prompt cruft from a string of shell output."
 223   (while (string-match "^% +[\r\n$]+ *" string)
 224     (setq string (substring string (match-end 0))))
 225   string)
 226
 227 (provide 'ob-shell)
 228
 229
 230
 231 ;;; ob-shell.el ends here