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;;; ob-eval.el --- Babel Functions for External Code Evaluation -*- lexical-binding: t; -*-
;; Copyright (C) 2009-2020 Free Software Foundation, Inc.
;; Author: Eric Schulte
;; Keywords: literate programming, reproducible research, comint
;; Homepage: https://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 (file-attribute-size (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
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