lisp/ob-shell.el

   1 ;;; ob-shell.el --- Babel Functions for Shell Evaluation -*- lexical-binding: t; -*-
   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                   t)
  35 (declare-function org-babel-comint-wait-for-output "ob-comint" (buffer))
  36 (declare-function org-babel-comint-buffer-livep "ob-comint" (buffer))
  37 (declare-function org-babel-comint-with-output "ob-comint" (meta &rest body)
  38                   t)
  39 (declare-function org-trim "org" (s &optional keep-lead))
  40 (declare-function orgtbl-to-generic "org-table" (table params))
  41
  42 (defvar org-babel-default-header-args:shell '())
  43
  44 (defcustom org-babel-shell-names
  45   '("sh" "bash" "csh" "ash" "dash" "ksh" "mksh" "posh")
  46   "List of names of shell supported by babel shell code blocks."
  47   :group 'org-babel
  48   :type '(repeat (string :tag "Shell name: "))
  49   :set (lambda (symbol value)
  50          (set-default symbol value)
  51          (dolist (name value)
  52            (eval `(defun ,(intern (concat "org-babel-execute:" name))
  53                       (body params)
  54                     ,(format "Execute a block of %s commands with Babel." name)
  55                     (let ((shell-file-name ,name))
  56                       (org-babel-execute:shell body params)))
  57                  t))))
  58
  59 (defun org-babel-execute:shell (body params)
  60   "Execute a block of Shell commands with Babel.
  61 This function is called by `org-babel-execute-src-block'."
  62   (let* ((session (org-babel-sh-initiate-session
  63                    (cdr (assoc :session params))))
  64          (stdin (let ((stdin (cdr (assoc :stdin params))))
  65                   (when stdin (org-babel-sh-var-to-string
  66                                (org-babel-ref-resolve stdin)))))
  67          (cmdline (cdr (assoc :cmdline params)))
  68          (full-body (org-babel-expand-body:generic
  69                      body params (org-babel-variable-assignments:shell params))))
  70     (org-babel-reassemble-table
  71      (org-babel-sh-evaluate session full-body params stdin cmdline)
  72      (org-babel-pick-name
  73       (cdr (assoc :colname-names params)) (cdr (assoc :colnames params)))
  74      (org-babel-pick-name
  75       (cdr (assoc :rowname-names params)) (cdr (assoc :rownames params))))))
  76
  77 (defun org-babel-prep-session:shell (session params)
  78   "Prepare SESSION according to the header arguments specified in PARAMS."
  79   (let* ((session (org-babel-sh-initiate-session session))
  80          (var-lines (org-babel-variable-assignments:shell params)))
  81     (org-babel-comint-in-buffer session
  82       (mapc (lambda (var)
  83               (insert var) (comint-send-input nil t)
  84               (org-babel-comint-wait-for-output session)) var-lines))
  85     session))
  86
  87 (defun org-babel-load-session:shell (session body params)
  88   "Load BODY into SESSION."
  89   (save-window-excursion
  90     (let ((buffer (org-babel-prep-session:shell session params)))
  91       (with-current-buffer buffer
  92         (goto-char (process-mark (get-buffer-process (current-buffer))))
  93         (insert (org-babel-chomp body)))
  94       buffer)))
  95
  96 ;; helper functions
  97 (defun org-babel-variable-assignments:sh-generic
  98     (varname values &optional sep hline)
  99   "Returns a list of statements declaring the values as a generic variable."
 100   (format "%s=%s" varname (org-babel-sh-var-to-sh values sep hline)))
 101
 102 (defun org-babel-variable-assignments:bash_array
 103     (varname values &optional sep hline)
 104   "Returns a list of statements declaring the values as a bash array."
 105   (format "unset %s\ndeclare -a %s=( %s )"
 106           varname varname
 107           (mapconcat
 108            (lambda (value) (org-babel-sh-var-to-sh value sep hline))
 109            values
 110            " ")))
 111
 112 (defun org-babel-variable-assignments:bash_assoc
 113     (varname values &optional sep hline)
 114   "Returns a list of statements declaring the values as bash associative array."
 115   (format "unset %s\ndeclare -A %s\n%s"
 116     varname varname
 117     (mapconcat
 118      (lambda (items)
 119        (format "%s[%s]=%s"
 120                varname
 121                (org-babel-sh-var-to-sh (car items) sep hline)
 122                (org-babel-sh-var-to-sh (cdr items) sep hline)))
 123      values
 124      "\n")))
 125
 126 (defun org-babel-variable-assignments:bash (varname values &optional sep hline)
 127   "Represents the parameters as useful Bash shell variables."
 128   (if (listp values)
 129       (if (and (listp (car values)) (= 1 (length (car values))))
 130           (org-babel-variable-assignments:bash_array varname values sep hline)
 131         (org-babel-variable-assignments:bash_assoc varname values sep hline))
 132     (org-babel-variable-assignments:sh-generic varname values sep hline)))
 133
 134 (defun org-babel-variable-assignments:shell (params)
 135   "Return list of shell statements assigning the block's variables."
 136   (let ((sep (cdr (assoc :separator params)))
 137         (hline (when (string= "yes" (cdr (assoc :hlines params)))
 138                  (or (cdr (assoc :hline-string params))
 139                      "hline"))))
 140     (mapcar
 141      (lambda (pair)
 142        (if (string-match "bash$" shell-file-name)
 143            (org-babel-variable-assignments:bash
 144             (car pair) (cdr pair) sep hline)
 145          (org-babel-variable-assignments:sh-generic
 146           (car pair) (cdr pair) sep hline)))
 147      (org-babel--get-vars params))))
 148
 149 (defun org-babel-sh-var-to-sh (var &optional sep hline)
 150   "Convert an elisp value to a shell variable.
 151 Convert an elisp var into a string of shell commands specifying a
 152 var of the same value."
 153   (concat "'" (replace-regexp-in-string
 154                "'" "'\"'\"'"
 155                (org-babel-sh-var-to-string var sep hline))
 156           "'"))
 157
 158 (defun org-babel-sh-var-to-string (var &optional sep hline)
 159   "Convert an elisp value to a string."
 160   (let ((echo-var (lambda (v) (if (stringp v) v (format "%S" v)))))
 161     (cond
 162      ((and (listp var) (or (listp (car var)) (equal (car var) 'hline)))
 163       (orgtbl-to-generic var  (list :sep (or sep "\t") :fmt echo-var
 164                                     :hline hline)))
 165      ((listp var)
 166       (mapconcat echo-var var "\n"))
 167      (t (funcall echo-var var)))))
 168
 169 (defun org-babel-sh-initiate-session (&optional session _params)
 170   "Initiate a session named SESSION according to PARAMS."
 171   (when (and session (not (string= session "none")))
 172     (save-window-excursion
 173       (or (org-babel-comint-buffer-livep session)
 174           (progn
 175             (shell session)
 176             ;; Needed for Emacs 23 since the marker is initially
 177             ;; undefined and the filter functions try to use it without
 178             ;; checking.
 179             (set-marker comint-last-output-start (point))
 180             (get-buffer (current-buffer)))))))
 181
 182 (defvar org-babel-sh-eoe-indicator "echo 'org_babel_sh_eoe'"
 183   "String to indicate that evaluation has completed.")
 184 (defvar org-babel-sh-eoe-output "org_babel_sh_eoe"
 185   "String to indicate that evaluation has completed.")
 186
 187 (defun org-babel-sh-evaluate (session body &optional params stdin cmdline)
 188   "Pass BODY to the Shell process in BUFFER.
 189 If RESULT-TYPE equals `output' then return a list of the outputs
 190 of the statements in BODY, if RESULT-TYPE equals `value' then
 191 return the value of the last statement in BODY."
 192   (let ((results
 193          (cond
 194           ((or stdin cmdline)          ; external shell script w/STDIN
 195            (let ((script-file (org-babel-temp-file "sh-script-"))
 196                  (stdin-file (org-babel-temp-file "sh-stdin-"))
 197                  (shebang (cdr (assoc :shebang params)))
 198                  (padline (not (string= "no" (cdr (assoc :padline params))))))
 199              (with-temp-file script-file
 200                (when shebang (insert (concat shebang "\n")))
 201                (when padline (insert "\n"))
 202                (insert body))
 203              (set-file-modes script-file #o755)
 204              (with-temp-file stdin-file (insert (or stdin "")))
 205              (with-temp-buffer
 206                (call-process-shell-command
 207                 (concat (if shebang script-file
 208                           (format "%s %s" shell-file-name script-file))
 209                         (and cmdline (concat " " cmdline)))
 210                 stdin-file
 211                 (current-buffer))
 212                (buffer-string))))
 213           (session                      ; session evaluation
 214            (mapconcat
 215             #'org-babel-sh-strip-weird-long-prompt
 216             (mapcar
 217              #'org-trim
 218              (butlast
 219               (org-babel-comint-with-output
 220                   (session org-babel-sh-eoe-output t body)
 221                 (mapc
 222                  (lambda (line)
 223                    (insert line)
 224                    (comint-send-input nil t)
 225                    (while (save-excursion
 226                             (goto-char comint-last-input-end)
 227                             (not (re-search-forward
 228                                   comint-prompt-regexp nil t)))
 229                      (accept-process-output
 230                       (get-buffer-process (current-buffer)))))
 231                  (append
 232                   (split-string (org-trim body) "\n")
 233                   (list org-babel-sh-eoe-indicator))))
 234               2)) "\n"))
 235           ('otherwise                   ; external shell script
 236            (if (and (cdr (assoc :shebang params))
 237                     (> (length (cdr (assoc :shebang params))) 0))
 238                (let ((script-file (org-babel-temp-file "sh-script-"))
 239                      (shebang (cdr (assoc :shebang params)))
 240                      (padline (not (equal "no" (cdr (assoc :padline params))))))
 241                  (with-temp-file script-file
 242                    (when shebang (insert (concat shebang "\n")))
 243                    (when padline (insert "\n"))
 244                    (insert body))
 245                  (set-file-modes script-file #o755)
 246                  (org-babel-eval script-file ""))
 247              (org-babel-eval shell-file-name (org-trim body)))))))
 248     (when results
 249       (let ((result-params (cdr (assoc :result-params params))))
 250         (org-babel-result-cond result-params
 251           results
 252           (let ((tmp-file (org-babel-temp-file "sh-")))
 253             (with-temp-file tmp-file (insert results))
 254             (org-babel-import-elisp-from-file tmp-file)))))))
 255
 256 (defun org-babel-sh-strip-weird-long-prompt (string)
 257   "Remove prompt cruft from a string of shell output."
 258   (while (string-match "^% +[\r\n$]+ *" string)
 259     (setq string (substring string (match-end 0))))
 260   string)
 261
 262 (provide 'ob-shell)
 263
 264
 265
 266 ;;; ob-shell.el ends here