lisp/ob-shell.el

   1 ;;; ob-shell.el --- org-babel functions for shell evaluation
   2
   3 ;; Copyright (C) 2009-2016 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:shell '())
  40
  41 (defcustom org-babel-shell-names
  42   '("sh" "bash" "csh" "ash" "dash" "ksh" "mksh" "posh")
  43   "List of names of shell supported by babel shell code blocks."
  44   :group 'org-babel
  45   :type 'string
  46   :initialize
  47   (lambda (symbol value)
  48     (set-default symbol (second value))
  49     (mapc
  50      (lambda (name)
  51        (eval `(defun ,(intern (concat "org-babel-execute:" name)) (body params)
  52                 ,(format "Execute a block of %s commands with Babel." name)
  53                 (let ((shell-file-name ,name))
  54                   (org-babel-execute:shell body params)))))
  55      (second value))))
  56
  57 (defun org-babel-execute:shell (body params)
  58   "Execute a block of Shell commands with Babel.
  59 This function is called by `org-babel-execute-src-block'."
  60   (let* ((session (org-babel-sh-initiate-session
  61                    (cdr (assoc :session params))))
  62          (stdin (let ((stdin (cdr (assoc :stdin params))))
  63                   (when stdin (org-babel-sh-var-to-string
  64                                (org-babel-ref-resolve stdin)))))
  65          (cmdline (cdr (assoc :cmdline params)))
  66          (full-body (org-babel-expand-body:generic
  67                      body params (org-babel-variable-assignments:shell params))))
  68     (org-babel-reassemble-table
  69      (org-babel-sh-evaluate session full-body params stdin cmdline)
  70      (org-babel-pick-name
  71       (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
  72      (org-babel-pick-name
  73       (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
  74
  75 (defun org-babel-prep-session:shell (session params)
  76   "Prepare SESSION according to the header arguments specified in PARAMS."
  77   (let* ((session (org-babel-sh-initiate-session session))
  78          (var-lines (org-babel-variable-assignments:shell params)))
  79     (org-babel-comint-in-buffer session
  80       (mapc (lambda (var)
  81               (insert var) (comint-send-input nil t)
  82               (org-babel-comint-wait-for-output session)) var-lines))
  83     session))
  84
  85 (defun org-babel-load-session:shell (session body params)
  86   "Load BODY into SESSION."
  87   (save-window-excursion
  88     (let ((buffer (org-babel-prep-session:shell session params)))
  89       (with-current-buffer buffer
  90         (goto-char (process-mark (get-buffer-process (current-buffer))))
  91         (insert (org-babel-chomp body)))
  92       buffer)))
  93
  94 ;; helper functions
  95 (defun org-babel-variable-assignments:sh-generic
  96     (varname values &optional sep hline)
  97   "Returns a list of statements declaring the values as a generic variable."
  98   (format "%s=%s" varname (org-babel-sh-var-to-sh values sep hline)))
  99
 100 (defun org-babel-variable-assignments:bash_array
 101     (varname values &optional sep hline)
 102   "Returns a list of statements declaring the values as a bash array."
 103   (format "unset %s\ndeclare -a %s=( %s )"
 104           varname varname
 105           (mapconcat
 106            (lambda (value) (org-babel-sh-var-to-sh value sep hline))
 107            values
 108            " ")))
 109
 110 (defun org-babel-variable-assignments:bash_assoc
 111     (varname values &optional sep hline)
 112   "Returns a list of statements declaring the values as bash associative array."
 113   (format "unset %s\ndeclare -A %s\n%s"
 114     varname varname
 115     (mapconcat
 116      (lambda (items)
 117        (format "%s[%s]=%s"
 118                varname
 119                (org-babel-sh-var-to-sh (car items) sep hline)
 120                (org-babel-sh-var-to-sh (cdr items) sep hline)))
 121      values
 122      "\n")))
 123
 124 (defun org-babel-variable-assignments:bash (varname values &optional sep hline)
 125   "Represents the parameters as useful Bash shell variables."
 126   (if (listp values)
 127       (if (and (listp (car values)) (= 1 (length (car values))))
 128           (org-babel-variable-assignments:bash_array varname values sep hline)
 129         (org-babel-variable-assignments:bash_assoc varname values sep hline))
 130     (org-babel-variable-assignments:sh-generic varname values sep hline)))
 131
 132 (defun org-babel-variable-assignments:shell (params)
 133   "Return list of shell statements assigning the block's variables."
 134   (let ((sep (cdr (assoc :separator params)))
 135         (hline (when (string= "yes" (cdr (assoc :hlines params)))
 136                  (or (cdr (assoc :hline-string params))
 137                      "hline"))))
 138     (mapcar
 139      (lambda (pair)
 140        (if (string-match "bash$" shell-file-name)
 141            (org-babel-variable-assignments:bash
 142             (car pair) (cdr pair) sep hline)
 143          (org-babel-variable-assignments:sh-generic
 144           (car pair) (cdr pair) sep hline)))
 145      (mapcar #'cdr (org-babel-get-header params :var)))))
 146
 147 (defun org-babel-sh-var-to-sh (var &optional sep hline)
 148   "Convert an elisp value to a shell variable.
 149 Convert an elisp var into a string of shell commands specifying a
 150 var of the same value."
 151   (concat "'" (replace-regexp-in-string
 152                "'" "'\"'\"'"
 153                (org-babel-sh-var-to-string var sep hline))
 154           "'"))
 155
 156 (defun org-babel-sh-var-to-string (var &optional sep hline)
 157   "Convert an elisp value to a string."
 158   (let ((echo-var (lambda (v) (if (stringp v) v (format "%S" v)))))
 159     (cond
 160      ((and (listp var) (or (listp (car var)) (equal (car var) 'hline)))
 161       (orgtbl-to-generic var  (list :sep (or sep "\t") :fmt echo-var
 162                                     :hline hline)))
 163      ((listp var)
 164       (mapconcat echo-var var "\n"))
 165      (t (funcall echo-var var)))))
 166
 167 (defun org-babel-sh-initiate-session (&optional session params)
 168   "Initiate a session named SESSION according to PARAMS."
 169   (when (and session (not (string= session "none")))
 170     (save-window-excursion
 171       (or (org-babel-comint-buffer-livep session)
 172           (progn
 173             (shell session)
 174             ;; Needed for Emacs 23 since the marker is initially
 175             ;; undefined and the filter functions try to use it without
 176             ;; checking.
 177             (set-marker comint-last-output-start (point))
 178             (get-buffer (current-buffer)))))))
 179
 180 (defvar org-babel-sh-eoe-indicator "echo 'org_babel_sh_eoe'"
 181   "String to indicate that evaluation has completed.")
 182 (defvar org-babel-sh-eoe-output "org_babel_sh_eoe"
 183   "String to indicate that evaluation has completed.")
 184
 185 (defun org-babel-sh-evaluate (session body &optional params stdin cmdline)
 186   "Pass BODY to the Shell process in BUFFER.
 187 If RESULT-TYPE equals `output' then return a list of the outputs
 188 of the statements in BODY, if RESULT-TYPE equals `value' then
 189 return the value of the last statement in BODY."
 190   (let ((results
 191          (cond
 192           ((or stdin cmdline)          ; external shell script w/STDIN
 193            (let ((script-file (org-babel-temp-file "sh-script-"))
 194                  (stdin-file (org-babel-temp-file "sh-stdin-"))
 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              (with-temp-file stdin-file (insert (or stdin "")))
 203              (with-temp-buffer
 204                (call-process-shell-command
 205                 (concat (if shebang script-file
 206                           (format "%s %s" shell-file-name script-file))
 207                         (and cmdline (concat " " cmdline)))
 208                 stdin-file
 209                 (current-buffer))
 210                (buffer-string))))
 211           (session                      ; session evaluation
 212            (mapconcat
 213             #'org-babel-sh-strip-weird-long-prompt
 214             (mapcar
 215              #'org-babel-trim
 216              (butlast
 217               (org-babel-comint-with-output
 218                   (session org-babel-sh-eoe-output t body)
 219                 (mapc
 220                  (lambda (line)
 221                    (insert line)
 222                    (comint-send-input nil t)
 223                    (while (save-excursion
 224                             (goto-char comint-last-input-end)
 225                             (not (re-search-forward
 226                                   comint-prompt-regexp nil t)))
 227                      (accept-process-output
 228                       (get-buffer-process (current-buffer)))))
 229                  (append
 230                   (split-string (org-babel-trim body) "\n")
 231                   (list org-babel-sh-eoe-indicator))))
 232               2)) "\n"))
 233           ('otherwise                   ; external shell script
 234            (if (and (cdr (assoc :shebang params))
 235                     (> (length (cdr (assoc :shebang params))) 0))
 236                (let ((script-file (org-babel-temp-file "sh-script-"))
 237                      (shebang (cdr (assoc :shebang params)))
 238                      (padline (not (equal "no" (cdr (assoc :padline params))))))
 239                  (with-temp-file script-file
 240                    (when shebang (insert (concat shebang "\n")))
 241                    (when padline (insert "\n"))
 242                    (insert body))
 243                  (set-file-modes script-file #o755)
 244                  (org-babel-eval script-file ""))
 245              (org-babel-eval shell-file-name (org-babel-trim body)))))))
 246     (when results
 247       (let ((result-params (cdr (assoc :result-params params))))
 248         (org-babel-result-cond result-params
 249           results
 250           (let ((tmp-file (org-babel-temp-file "sh-")))
 251             (with-temp-file tmp-file (insert results))
 252             (org-babel-import-elisp-from-file tmp-file)))))))
 253
 254 (defun org-babel-sh-strip-weird-long-prompt (string)
 255   "Remove prompt cruft from a string of shell output."
 256   (while (string-match "^% +[\r\n$]+ *" string)
 257     (setq string (substring string (match-end 0))))
 258   string)
 259
 260 (provide 'ob-shell)
 261
 262
 263
 264 ;;; ob-shell.el ends here