lisp/ob-sh.el

   1 ;;; ob-sh.el --- org-babel functions for shell evaluation
   2
   3 ;; Copyright (C) 2009-2012  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 'ob-ref)
  31 (require 'ob-comint)
  32 (require 'ob-eval)
  33 (require 'shell)
  34 (eval-when-compile (require 'cl))
  35
  36 (declare-function org-babel-comint-in-buffer "ob-comint" (buffer &rest body))
  37 (declare-function org-babel-comint-wait-for-output "ob-comint" (buffer))
  38 (declare-function org-babel-comint-buffer-livep "ob-comint" (buffer))
  39 (declare-function org-babel-comint-with-output "ob-comint" (meta &rest body))
  40 (declare-function orgtbl-to-generic "org-table" (table params))
  41
  42 (defvar org-babel-default-header-args:sh '())
  43
  44 (defvar org-babel-sh-command "sh"
  45   "Command used to invoke a shell.
  46 This will be passed to  `shell-command-on-region'")
  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 (defun org-babel-execute:sh (body params)
  55   "Execute a block of Shell commands with Babel.
  56 This function is called by `org-babel-execute-src-block'."
  57   (let* ((session (org-babel-sh-initiate-session
  58                    (cdr (assoc :session params))))
  59          (stdin ((lambda (stdin) (when stdin (org-babel-sh-var-to-string
  60                                               (org-babel-ref-resolve stdin))))
  61                  (cdr (assoc :stdin params))))
  62          (full-body (org-babel-expand-body:generic
  63                      body params (org-babel-variable-assignments:sh params))))
  64     (org-babel-reassemble-table
  65      (org-babel-sh-evaluate session full-body params stdin)
  66      (org-babel-pick-name
  67       (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
  68      (org-babel-pick-name
  69       (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
  70
  71 (defun org-babel-prep-session:sh (session params)
  72   "Prepare SESSION according to the header arguments specified in PARAMS."
  73   (let* ((session (org-babel-sh-initiate-session session))
  74          (var-lines (org-babel-variable-assignments:sh params)))
  75     (org-babel-comint-in-buffer session
  76       (mapc (lambda (var)
  77               (insert var) (comint-send-input nil t)
  78               (org-babel-comint-wait-for-output session)) var-lines))
  79     session))
  80
  81 (defun org-babel-load-session:sh (session body params)
  82   "Load BODY into SESSION."
  83   (save-window-excursion
  84     (let ((buffer (org-babel-prep-session:sh session params)))
  85       (with-current-buffer buffer
  86         (goto-char (process-mark (get-buffer-process (current-buffer))))
  87         (insert (org-babel-chomp body)))
  88       buffer)))
  89
  90 ;; helper functions
  91
  92 (defun org-babel-variable-assignments:sh (params)
  93   "Return list of shell statements assigning the block's variables."
  94   (let ((sep (cdr (assoc :separator params))))
  95     (mapcar
  96      (lambda (pair)
  97        (format "%s=%s"
  98                (car pair)
  99                (org-babel-sh-var-to-sh (cdr pair) sep)))
 100      (mapcar #'cdr (org-babel-get-header params :var)))))
 101
 102 (defun org-babel-sh-var-to-sh (var &optional sep)
 103   "Convert an elisp value to a shell variable.
 104 Convert an elisp var into a string of shell commands specifying a
 105 var of the same value."
 106   (format org-babel-sh-var-quote-fmt (org-babel-sh-var-to-string var sep)))
 107
 108 (defun org-babel-sh-var-to-string (var &optional sep)
 109   "Convert an elisp value to a string."
 110   (let ((echo-var (lambda (v) (if (stringp v) v (format "%S" v)))))
 111     (cond
 112      ((and (listp var) (listp (car var)))
 113       (orgtbl-to-generic var  (list :sep (or sep "\t") :fmt echo-var)))
 114      ((listp var)
 115       (mapconcat echo-var var "\n"))
 116      (t (funcall echo-var var)))))
 117
 118 (defun org-babel-sh-table-or-results (results)
 119   "Convert RESULTS to an appropriate elisp value.
 120 If the results look like a table, then convert them into an
 121 Emacs-lisp table, otherwise return the results as a string."
 122   (org-babel-script-escape results))
 123
 124 (defun org-babel-sh-initiate-session (&optional session params)
 125   "Initiate a session named SESSION according to PARAMS."
 126   (when (and session (not (string= session "none")))
 127     (save-window-excursion
 128       (or (org-babel-comint-buffer-livep session)
 129           (progn (shell session) (get-buffer (current-buffer)))))))
 130
 131 (defvar org-babel-sh-eoe-indicator "echo 'org_babel_sh_eoe'"
 132   "String to indicate that evaluation has completed.")
 133 (defvar org-babel-sh-eoe-output "org_babel_sh_eoe"
 134   "String to indicate that evaluation has completed.")
 135
 136 (defun org-babel-sh-evaluate (session body &optional params stdin)
 137   "Pass BODY to the Shell process in BUFFER.
 138 If RESULT-TYPE equals 'output then return a list of the outputs
 139 of the statements in BODY, if RESULT-TYPE equals 'value then
 140 return the value of the last statement in BODY."
 141   ((lambda (results)
 142      (when results
 143        (let ((result-params (cdr (assoc :result-params params))))
 144          (if (or (member "scalar" result-params)
 145                  (member "verbatim" result-params)
 146                  (member "output" result-params))
 147              results
 148            (let ((tmp-file (org-babel-temp-file "sh-")))
 149              (with-temp-file tmp-file (insert results))
 150              (org-babel-import-elisp-from-file tmp-file))))))
 151    (cond
 152     (stdin                              ; external shell script w/STDIN
 153      (let ((script-file (org-babel-temp-file "sh-script-"))
 154            (stdin-file (org-babel-temp-file "sh-stdin-"))
 155            (shebang (cdr (assoc :shebang params)))
 156            (padline (not (string= "no" (cdr (assoc :padline params))))))
 157        (with-temp-file script-file
 158          (when shebang (insert (concat shebang "\n")))
 159          (when padline (insert "\n"))
 160          (insert body))
 161        (set-file-modes script-file #o755)
 162        (with-temp-file stdin-file (insert stdin))
 163        (with-temp-buffer
 164          (call-process-shell-command
 165           (if shebang
 166               script-file
 167             (format "%s %s" org-babel-sh-command script-file))
 168           stdin-file
 169           (current-buffer))
 170          (buffer-string))))
 171     (session                            ; session evaluation
 172      (mapconcat
 173       #'org-babel-sh-strip-weird-long-prompt
 174       (mapcar
 175        #'org-babel-trim
 176        (butlast
 177         (org-babel-comint-with-output
 178             (session org-babel-sh-eoe-output t body)
 179           (mapc
 180            (lambda (line)
 181              (insert line)
 182              (comint-send-input nil t)
 183              (while (save-excursion
 184                       (goto-char comint-last-input-end)
 185                       (not (re-search-forward
 186                             comint-prompt-regexp nil t)))
 187                (accept-process-output (get-buffer-process (current-buffer)))))
 188            (append
 189             (split-string (org-babel-trim body) "\n")
 190             (list org-babel-sh-eoe-indicator))))
 191         2)) "\n"))
 192     ('otherwise                         ; external shell script
 193      (if (cdr (assoc :shebang params))
 194          (let ((script-file (org-babel-temp-file "sh-script-"))
 195                (shebang (cdr (assoc :shebang params)))
 196                (padline (not (string= "no" (cdr (assoc :padline params))))))
 197            (with-temp-file script-file
 198              (when shebang (insert (concat shebang "\n")))
 199              (when padline (insert "\n"))
 200              (insert body))
 201            (set-file-modes script-file #o755)
 202            (org-babel-eval script-file ""))
 203        (org-babel-eval org-babel-sh-command (org-babel-trim body)))))))
 204
 205 (defun org-babel-sh-strip-weird-long-prompt (string)
 206   "Remove prompt cruft from a string of shell output."
 207   (while (string-match "^% +[\r\n$]+ *" string)
 208     (setq string (substring string (match-end 0))))
 209   string)
 210
 211 (provide 'ob-sh)
 212
 213
 214
 215 ;;; ob-sh.el ends here