lisp/ob-shell.el

   1 ;;; ob-shell.el --- Babel Functions for Shell Evaluation -*- lexical-binding: t; -*-
   2
   3 ;; Copyright (C) 2009-2017 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 <https://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 (require 'cl-lib)
  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 (defvar org-babel-shell-names)
  44
  45 (defun org-babel-shell-initialize ()
  46   "Define execution functions associated to shell names.
  47 This function has to be called whenever `org-babel-shell-names'
  48 is modified outside the Customize interface."
  49   (interactive)
  50   (dolist (name org-babel-shell-names)
  51     (eval `(defun ,(intern (concat "org-babel-execute:" name))
  52                (body params)
  53              ,(format "Execute a block of %s commands with Babel." name)
  54              (let ((shell-file-name ,name))
  55                (org-babel-execute:shell body params))))
  56     (eval `(defalias ',(intern (concat "org-babel-variable-assignments:" name))
  57              'org-babel-variable-assignments:shell
  58              ,(format "Return list of %s statements assigning to the block's \
  59 variables."
  60                       name)))))
  61
  62 (defcustom org-babel-shell-names
  63   '("sh" "bash" "csh" "ash" "dash" "ksh" "mksh" "posh")
  64   "List of names of shell supported by babel shell code blocks.
  65 Call `org-babel-shell-initialize' when modifying this variable
  66 outside the Customize interface."
  67   :group 'org-babel
  68   :type '(repeat (string :tag "Shell name: "))
  69   :set (lambda (symbol value)
  70          (set-default symbol value)
  71          (org-babel-shell-initialize)))
  72
  73 (defun org-babel-execute:shell (body params)
  74   "Execute a block of Shell commands with Babel.
  75 This function is called by `org-babel-execute-src-block'."
  76   (let* ((session (org-babel-sh-initiate-session
  77                    (cdr (assq :session params))))
  78          (stdin (let ((stdin (cdr (assq :stdin params))))
  79                   (when stdin (org-babel-sh-var-to-string
  80                                (org-babel-ref-resolve stdin)))))
  81          (cmdline (cdr (assq :cmdline params)))
  82          (full-body (org-babel-expand-body:generic
  83                      body params (org-babel-variable-assignments:shell params))))
  84     (org-babel-reassemble-table
  85      (org-babel-sh-evaluate session full-body params stdin cmdline)
  86      (org-babel-pick-name
  87       (cdr (assq :colname-names params)) (cdr (assq :colnames params)))
  88      (org-babel-pick-name
  89       (cdr (assq :rowname-names params)) (cdr (assq :rownames params))))))
  90
  91 (defun org-babel-prep-session:shell (session params)
  92   "Prepare SESSION according to the header arguments specified in PARAMS."
  93   (let* ((session (org-babel-sh-initiate-session session))
  94          (var-lines (org-babel-variable-assignments:shell params)))
  95     (org-babel-comint-in-buffer session
  96       (mapc (lambda (var)
  97               (insert var) (comint-send-input nil t)
  98               (org-babel-comint-wait-for-output session)) var-lines))
  99     session))
 100
 101 (defun org-babel-load-session:shell (session body params)
 102   "Load BODY into SESSION."
 103   (save-window-excursion
 104     (let ((buffer (org-babel-prep-session:shell session params)))
 105       (with-current-buffer buffer
 106         (goto-char (process-mark (get-buffer-process (current-buffer))))
 107         (insert (org-babel-chomp body)))
 108       buffer)))
 109
 110 \f
 111 ;;; Helper functions
 112 (defun org-babel--variable-assignments:sh-generic
 113     (varname values &optional sep hline)
 114   "Returns a list of statements declaring the values as a generic variable."
 115   (format "%s=%s" varname (org-babel-sh-var-to-sh values sep hline)))
 116
 117 (defun org-babel--variable-assignments:bash_array
 118     (varname values &optional sep hline)
 119   "Returns a list of statements declaring the values as a bash array."
 120   (format "unset %s\ndeclare -a %s=( %s )"
 121           varname varname
 122           (mapconcat
 123            (lambda (value) (org-babel-sh-var-to-sh value sep hline))
 124            values
 125            " ")))
 126
 127 (defun org-babel--variable-assignments:bash_assoc
 128     (varname values &optional sep hline)
 129   "Returns a list of statements declaring the values as bash associative array."
 130   (format "unset %s\ndeclare -A %s\n%s"
 131     varname varname
 132     (mapconcat
 133      (lambda (items)
 134        (format "%s[%s]=%s"
 135                varname
 136                (org-babel-sh-var-to-sh (car items) sep hline)
 137                (org-babel-sh-var-to-sh (cdr items) sep hline)))
 138      values
 139      "\n")))
 140
 141 (defun org-babel--variable-assignments:bash (varname values &optional sep hline)
 142   "Represents the parameters as useful Bash shell variables."
 143   (pcase values
 144     (`((,_ ,_ . ,_) . ,_)               ;two-dimensional array
 145      (org-babel--variable-assignments:bash_assoc varname values sep hline))
 146     (`(,_ . ,_)                         ;simple list
 147      (org-babel--variable-assignments:bash_array varname values sep hline))
 148     (_                                  ;scalar value
 149      (org-babel--variable-assignments:sh-generic varname values sep hline))))
 150
 151 (defun org-babel-variable-assignments:shell (params)
 152   "Return list of shell statements assigning the block's variables."
 153   (let ((sep (cdr (assq :separator params)))
 154         (hline (when (string= "yes" (cdr (assq :hlines params)))
 155                  (or (cdr (assq :hline-string params))
 156                      "hline"))))
 157     (mapcar
 158      (lambda (pair)
 159        (if (string-suffix-p "bash" shell-file-name)
 160            (org-babel--variable-assignments:bash
 161             (car pair) (cdr pair) sep hline)
 162          (org-babel--variable-assignments:sh-generic
 163           (car pair) (cdr pair) sep hline)))
 164      (org-babel--get-vars params))))
 165
 166 (defun org-babel-sh-var-to-sh (var &optional sep hline)
 167   "Convert an elisp value to a shell variable.
 168 Convert an elisp var into a string of shell commands specifying a
 169 var of the same value."
 170   (concat "'" (replace-regexp-in-string
 171                "'" "'\"'\"'"
 172                (org-babel-sh-var-to-string var sep hline))
 173           "'"))
 174
 175 (defun org-babel-sh-var-to-string (var &optional sep hline)
 176   "Convert an elisp value to a string."
 177   (let ((echo-var (lambda (v) (if (stringp v) v (format "%S" v)))))
 178     (cond
 179      ((and (listp var) (or (listp (car var)) (eq (car var) 'hline)))
 180       (orgtbl-to-generic var  (list :sep (or sep "\t") :fmt echo-var
 181                                     :hline hline)))
 182      ((listp var)
 183       (mapconcat echo-var var "\n"))
 184      (t (funcall echo-var var)))))
 185
 186 (defun org-babel-sh-initiate-session (&optional session _params)
 187   "Initiate a session named SESSION according to PARAMS."
 188   (when (and session (not (string= session "none")))
 189     (save-window-excursion
 190       (or (org-babel-comint-buffer-livep session)
 191           (progn
 192             (shell session)
 193             ;; Needed for Emacs 23 since the marker is initially
 194             ;; undefined and the filter functions try to use it without
 195             ;; checking.
 196             (set-marker comint-last-output-start (point))
 197             (get-buffer (current-buffer)))))))
 198
 199 (defvar org-babel-sh-eoe-indicator "echo 'org_babel_sh_eoe'"
 200   "String to indicate that evaluation has completed.")
 201 (defvar org-babel-sh-eoe-output "org_babel_sh_eoe"
 202   "String to indicate that evaluation has completed.")
 203
 204 (defun org-babel-sh-evaluate (session body &optional params stdin cmdline)
 205   "Pass BODY to the Shell process in BUFFER.
 206 If RESULT-TYPE equals `output' then return a list of the outputs
 207 of the statements in BODY, if RESULT-TYPE equals `value' then
 208 return the value of the last statement in BODY."
 209   (let ((results
 210          (cond
 211           ((or stdin cmdline)          ; external shell script w/STDIN
 212            (let ((script-file (org-babel-temp-file "sh-script-"))
 213                  (stdin-file (org-babel-temp-file "sh-stdin-"))
 214                  (shebang (cdr (assq :shebang params)))
 215                  (padline (not (string= "no" (cdr (assq :padline params))))))
 216              (with-temp-file script-file
 217                (when shebang (insert (concat shebang "\n")))
 218                (when padline (insert "\n"))
 219                (insert body))
 220              (set-file-modes script-file #o755)
 221              (with-temp-file stdin-file (insert (or stdin "")))
 222              (with-temp-buffer
 223                (call-process-shell-command
 224                 (concat (if shebang script-file
 225                           (format "%s %s" shell-file-name script-file))
 226                         (and cmdline (concat " " cmdline)))
 227                 stdin-file
 228                 (current-buffer))
 229                (buffer-string))))
 230           (session                      ; session evaluation
 231            (mapconcat
 232             #'org-babel-sh-strip-weird-long-prompt
 233             (mapcar
 234              #'org-trim
 235              (butlast
 236               (org-babel-comint-with-output
 237                   (session org-babel-sh-eoe-output t body)
 238                 (mapc
 239                  (lambda (line)
 240                    (insert line)
 241                    (comint-send-input nil t)
 242                    (while (save-excursion
 243                             (goto-char comint-last-input-end)
 244                             (not (re-search-forward
 245                                   comint-prompt-regexp nil t)))
 246                      (accept-process-output
 247                       (get-buffer-process (current-buffer)))))
 248                  (append
 249                   (split-string (org-trim body) "\n")
 250                   (list org-babel-sh-eoe-indicator))))
 251               2)) "\n"))
 252           ('otherwise                   ; external shell script
 253            (if (and (cdr (assq :shebang params))
 254                     (> (length (cdr (assq :shebang params))) 0))
 255                (let ((script-file (org-babel-temp-file "sh-script-"))
 256                      (shebang (cdr (assq :shebang params)))
 257                      (padline (not (equal "no" (cdr (assq :padline params))))))
 258                  (with-temp-file script-file
 259                    (when shebang (insert (concat shebang "\n")))
 260                    (when padline (insert "\n"))
 261                    (insert body))
 262                  (set-file-modes script-file #o755)
 263                  (org-babel-eval script-file ""))
 264              (org-babel-eval shell-file-name (org-trim body)))))))
 265     (when results
 266       (let ((result-params (cdr (assq :result-params params))))
 267         (org-babel-result-cond result-params
 268           results
 269           (let ((tmp-file (org-babel-temp-file "sh-")))
 270             (with-temp-file tmp-file (insert results))
 271             (org-babel-import-elisp-from-file tmp-file)))))))
 272
 273 (defun org-babel-sh-strip-weird-long-prompt (string)
 274   "Remove prompt cruft from a string of shell output."
 275   (while (string-match "^% +[\r\n$]+ *" string)
 276     (setq string (substring string (match-end 0))))
 277   string)
 278
 279 (provide 'ob-shell)
 280
 281
 282
 283 ;;; ob-shell.el ends here