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: 7.5
   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-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          (result-params (cdr (assoc :result-params params)))
  60          (full-body (org-babel-expand-body:generic
  61                      body params (org-babel-variable-assignments:sh params))))
  62     (org-babel-reassemble-table
  63      (org-babel-sh-evaluate session full-body result-params)
  64      (org-babel-pick-name
  65       (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
  66      (org-babel-pick-name
  67       (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
  68
  69 (defun org-babel-prep-session:sh (session params)
  70   "Prepare SESSION according to the header arguments specified in PARAMS."
  71   (let* ((session (org-babel-sh-initiate-session session))
  72          (var-lines (org-babel-variable-assignments:sh params)))
  73     (org-babel-comint-in-buffer session
  74       (mapc (lambda (var)
  75               (insert var) (comint-send-input nil t)
  76               (org-babel-comint-wait-for-output session)) var-lines))
  77     session))
  78
  79 (defun org-babel-load-session:sh (session body params)
  80   "Load BODY into SESSION."
  81   (save-window-excursion
  82     (let ((buffer (org-babel-prep-session:sh session params)))
  83       (with-current-buffer buffer
  84         (goto-char (process-mark (get-buffer-process (current-buffer))))
  85         (insert (org-babel-chomp body)))
  86       buffer)))
  87
  88 ;; helper functions
  89
  90 (defun org-babel-variable-assignments:sh (params)
  91   "Return list of shell statements assigning the block's variables"
  92   (let ((sep (cdr (assoc :separator params))))
  93     (mapcar
  94      (lambda (pair)
  95        (format "%s=%s"
  96                (car pair)
  97                (org-babel-sh-var-to-sh (cdr pair) sep)))
  98      (mapcar #'cdr (org-babel-get-header params :var)))))
  99
 100 (defun org-babel-sh-var-to-sh (var &optional sep)
 101   "Convert an elisp value to a shell variable.
 102 Convert an elisp var into a string of shell commands specifying a
 103 var of the same value."
 104   (flet ((echo-var (v) (if (stringp v) v (format "%S" v))))
 105     ((lambda (var) (format org-babel-sh-var-quote-fmt var))
 106      (cond
 107       ((and (listp var) (listp (car var)))
 108        (orgtbl-to-generic var  (list :sep (or sep "\t") :fmt #'echo-var)))
 109       ((listp var)
 110        (mapconcat #'echo-var var "\n"))
 111       (t (echo-var var))))))
 112
 113 (defun org-babel-sh-table-or-results (results)
 114   "Convert RESULTS to an appropriate elisp value.
 115 If the results look like a table, then convert them into an
 116 Emacs-lisp table, otherwise return the results as a string."
 117   (org-babel-script-escape results))
 118
 119 (defun org-babel-sh-initiate-session (&optional session params)
 120   "Initiate a session named SESSION according to PARAMS."
 121   (when (and session (not (string= session "none")))
 122     (save-window-excursion
 123       (or (org-babel-comint-buffer-livep session)
 124           (progn (shell session) (get-buffer (current-buffer)))))))
 125
 126 (defvar org-babel-sh-eoe-indicator "echo 'org_babel_sh_eoe'"
 127   "String to indicate that evaluation has completed.")
 128 (defvar org-babel-sh-eoe-output "org_babel_sh_eoe"
 129   "String to indicate that evaluation has completed.")
 130
 131 (defun org-babel-sh-evaluate (session body &optional result-params)
 132   "Pass BODY to the Shell process in BUFFER.
 133 If RESULT-TYPE equals 'output then return a list of the outputs
 134 of the statements in BODY, if RESULT-TYPE equals 'value then
 135 return the value of the last statement in BODY."
 136   ((lambda (results)
 137      (when results
 138        (if (or (member "scalar" result-params)
 139                (member "output" result-params))
 140            results
 141          (let ((tmp-file (org-babel-temp-file "sh-")))
 142            (with-temp-file tmp-file (insert results))
 143            (org-babel-import-elisp-from-file tmp-file)))))
 144    (if (not session)
 145        (org-babel-eval org-babel-sh-command (org-babel-trim body))
 146      (mapconcat
 147       #'org-babel-sh-strip-weird-long-prompt
 148       (mapcar
 149        #'org-babel-trim
 150        (butlast
 151         (org-babel-comint-with-output
 152             (session org-babel-sh-eoe-output t body)
 153           (mapc
 154            (lambda (line)
 155              (insert line) (comint-send-input nil t) (sleep-for 0.25))
 156            (append
 157             (split-string (org-babel-trim body) "\n")
 158             (list org-babel-sh-eoe-indicator))))
 159         2)) "\n"))))
 160
 161 (defun org-babel-sh-strip-weird-long-prompt (string)
 162   "Remove prompt cruft from a string of shell output."
 163   (while (string-match "^% +[\r\n$]+ *" string)
 164     (setq string (substring string (match-end 0))))
 165   string)
 166
 167 (provide 'ob-sh)
 168
 169 ;; arch-tag: 416dd531-c230-4b0a-a5bf-8d948f990f2d
 170
 171 ;;; ob-sh.el ends here