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elpa/org-20171030/ob-eval.el

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+;;; ob-eval.el --- Babel Functions for External Code Evaluation -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2009-2017 Free Software Foundation, Inc.
+
+;; Author: Eric Schulte
+;; Keywords: literate programming, reproducible research, comint
+;; Homepage: http://orgmode.org
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software: you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; These functions build existing Emacs support for executing external
+;; shell commands.
+
+;;; Code:
+(require 'org-macs)
+
+(defvar org-babel-error-buffer-name "*Org-Babel Error Output*")
+(declare-function org-babel-temp-file "ob-core" (prefix &optional suffix))
+
+(defun org-babel-eval-error-notify (exit-code stderr)
+  "Open a buffer to display STDERR and a message with the value of EXIT-CODE."
+  (let ((buf (get-buffer-create org-babel-error-buffer-name)))
+    (with-current-buffer buf
+      (goto-char (point-max))
+      (save-excursion (insert stderr)))
+    (display-buffer buf))
+  (message "Babel evaluation exited with code %S" exit-code))
+
+(defun org-babel-eval (cmd body)
+  "Run CMD on BODY.
+If CMD succeeds then return its results, otherwise display
+STDERR with `org-babel-eval-error-notify'."
+  (let ((err-buff (get-buffer-create " *Org-Babel Error*")) exit-code)
+    (with-current-buffer err-buff (erase-buffer))
+    (with-temp-buffer
+      (insert body)
+      (setq exit-code
+	    (org-babel--shell-command-on-region
+	     (point-min) (point-max) cmd err-buff))
+      (if (or (not (numberp exit-code)) (> exit-code 0))
+	  (progn
+	    (with-current-buffer err-buff
+	      (org-babel-eval-error-notify exit-code (buffer-string)))
+	    (save-excursion
+	      (when (get-buffer org-babel-error-buffer-name)
+		(with-current-buffer org-babel-error-buffer-name
+		  (unless (derived-mode-p 'compilation-mode)
+		    (compilation-mode))
+		  ;; Compilation-mode enforces read-only, but Babel expects the buffer modifiable.
+		  (setq buffer-read-only nil))))
+	    nil)
+	(buffer-string)))))
+
+(defun org-babel-eval-read-file (file)
+  "Return the contents of FILE as a string."
+  (with-temp-buffer (insert-file-contents file)
+		    (buffer-string)))
+
+(defun org-babel--shell-command-on-region (start end command error-buffer)
+  "Execute COMMAND in an inferior shell with region as input.
+
+Stripped down version of shell-command-on-region for internal use
+in Babel only.  This lets us work around errors in the original
+function in various versions of Emacs.
+"
+  (let ((input-file (org-babel-temp-file "ob-input-"))
+	(error-file (if error-buffer (org-babel-temp-file "ob-error-") nil))
+	;; Unfortunately, `executable-find' does not support file name
+	;; handlers.  Therefore, we could use it in the local case
+	;; only.
+	(shell-file-name
+	 (cond ((and (not (file-remote-p default-directory))
+		     (executable-find shell-file-name))
+		shell-file-name)
+	       ((file-executable-p
+		 (concat (file-remote-p default-directory) shell-file-name))
+		shell-file-name)
+	       ("/bin/sh")))
+	exit-status)
+    ;; There is an error in `process-file' when `error-file' exists.
+    ;; This is fixed in Emacs trunk as of 2012-12-21; let's use this
+    ;; workaround for now.
+    (unless (file-remote-p default-directory)
+      (delete-file error-file))
+    ;; we always call this with 'replace, remove conditional
+    ;; Replace specified region with output from command.
+    (let ((swap (< start end)))
+      (goto-char start)
+      (push-mark (point) 'nomsg)
+      (write-region start end input-file)
+      (delete-region start end)
+      (setq exit-status
+	    (process-file shell-file-name input-file
+			  (if error-file
+			      (list t error-file)
+			    t)
+			  nil shell-command-switch command))
+      (when swap (exchange-point-and-mark)))
+
+    (when (and input-file (file-exists-p input-file)
+	       ;; bind org-babel--debug-input around the call to keep
+	       ;; the temporary input files available for inspection
+	       (not (when (boundp 'org-babel--debug-input)
+		      org-babel--debug-input)))
+      (delete-file input-file))
+
+    (when (and error-file (file-exists-p error-file))
+      (when (< 0 (nth 7 (file-attributes error-file)))
+	(with-current-buffer (get-buffer-create error-buffer)
+	  (let ((pos-from-end (- (point-max) (point))))
+	    (or (bobp)
+		(insert "\f\n"))
+	    ;; Do no formatting while reading error file,
+	    ;; because that can run a shell command, and we
+	    ;; don't want that to cause an infinite recursion.
+	    (format-insert-file error-file nil)
+	    ;; Put point after the inserted errors.
+	    (goto-char (- (point-max) pos-from-end)))
+	  (current-buffer)))
+      (delete-file error-file))
+    exit-status))
+
+(defun org-babel-eval-wipe-error-buffer ()
+  "Delete the contents of the Org code block error buffer.
+This buffer is named by `org-babel-error-buffer-name'."
+  (when (get-buffer org-babel-error-buffer-name)
+    (with-current-buffer org-babel-error-buffer-name
+      (delete-region (point-min) (point-max)))))
+
+(provide 'ob-eval)
+
+
+
+;;; ob-eval.el ends here