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| | ;;; ob-comint.el --- Babel Functions for Interaction with Comint Buffers -*- lexical-binding: t; -*-
;; Copyright (C) 2009-2021 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 on comint to ease the sending and receiving
;; of commands and results from comint buffers.
;; Note that the buffers in this file are analogous to sessions in
;; org-babel at large.
;;; Code:
(require 'ob-core)
(require 'org-compat)
(require 'comint)
(defun org-babel-comint-buffer-livep (buffer)
"Check if BUFFER is a comint buffer with a live process."
(let ((buffer (when buffer (get-buffer buffer))))
(and buffer (buffer-live-p buffer) (get-buffer-process buffer) buffer)))
(defmacro org-babel-comint-in-buffer (buffer &rest body)
"Check BUFFER and execute BODY.
BUFFER is checked with `org-babel-comint-buffer-livep'. BODY is
executed inside the protection of `save-excursion' and
`save-match-data'."
(declare (indent 1))
`(progn
(unless (org-babel-comint-buffer-livep ,buffer)
(error "Buffer %s does not exist or has no process" ,buffer))
(save-match-data
(with-current-buffer ,buffer
(save-excursion
(let ((comint-input-filter (lambda (_input) nil)))
,@body))))))
(def-edebug-spec org-babel-comint-in-buffer (form body))
(defmacro org-babel-comint-with-output (meta &rest body)
"Evaluate BODY in BUFFER and return process output.
Will wait until EOE-INDICATOR appears in the output, then return all
process output. If REMOVE-ECHO and FULL-BODY are present and non-nil,
then strip echo'd body from the returned output. PROMPT-REGEXP is a
filter that, if provided, overrides the default regexp that tries to
filter out the shell prompt. META should be a list containing the
following where the last three elements are optional.
(BUFFER EOE-INDICATOR REMOVE-ECHO FULL-BODY PROMPT-REGEXP)
This macro ensures that the filter is removed in case of an error
or user `keyboard-quit' during execution of body."
(declare (indent 1))
(let ((buffer (nth 0 meta))
(eoe-indicator (nth 1 meta))
(remove-echo (nth 2 meta))
(full-body (nth 3 meta))
(prompt-regexp (if (nth 4 meta)
(nth 4 meta)
comint-prompt-regexp)))
`(org-babel-comint-in-buffer ,buffer
(let* ((string-buffer "")
(comint-output-filter-functions
(cons (lambda (text) (setq string-buffer (concat string-buffer text)))
comint-output-filter-functions))
dangling-text)
;; got located, and save dangling text
(goto-char (process-mark (get-buffer-process (current-buffer))))
(let ((start (point))
(end (point-max)))
(setq dangling-text (buffer-substring start end))
(delete-region start end))
;; pass FULL-BODY to process
,@body
;; wait for end-of-evaluation indicator
(while (progn
(goto-char comint-last-input-end)
(not (save-excursion
(and (re-search-forward
(regexp-quote ,eoe-indicator) nil t)
(re-search-forward
comint-prompt-regexp nil t)))))
(accept-process-output (get-buffer-process (current-buffer)))
;; thought the following this would allow async
;; background running, but I was wrong...
;; (run-with-timer .5 .5 'accept-process-output
;; (get-buffer-process (current-buffer)))
)
;; replace cut dangling text
(goto-char (process-mark (get-buffer-process (current-buffer))))
(insert dangling-text)
;; remove echo'd FULL-BODY from input
(when (and ,remove-echo ,full-body
(string-match
(replace-regexp-in-string
"\n" "[\r\n]+" (regexp-quote (or ,full-body "")))
string-buffer))
(setq string-buffer (substring string-buffer (match-end 0))))
(split-string string-buffer ,prompt-regexp)))))
(def-edebug-spec org-babel-comint-with-output (sexp body))
(defun org-babel-comint-input-command (buffer cmd)
"Pass CMD to BUFFER.
The input will not be echoed."
(org-babel-comint-in-buffer buffer
(goto-char (process-mark (get-buffer-process buffer)))
(insert cmd)
(comint-send-input)
(org-babel-comint-wait-for-output buffer)))
(defun org-babel-comint-wait-for-output (buffer)
"Wait until output arrives from BUFFER.
Note: this is only safe when waiting for the result of a single
statement (not large blocks of code)."
(org-babel-comint-in-buffer buffer
(while (progn
(goto-char comint-last-input-end)
(not (and (re-search-forward comint-prompt-regexp nil t)
(goto-char (match-beginning 0))
(string= (face-name (face-at-point))
"comint-highlight-prompt"))))
(accept-process-output (get-buffer-process buffer)))))
(defun org-babel-comint-eval-invisibly-and-wait-for-file
(buffer file string &optional period)
"Evaluate STRING in BUFFER invisibly.
Don't return until FILE exists. Code in STRING must ensure that
FILE exists at end of evaluation."
(unless (org-babel-comint-buffer-livep buffer)
(error "Buffer %s does not exist or has no process" buffer))
(when (file-exists-p file) (delete-file file))
(process-send-string
(get-buffer-process buffer)
(if (= (aref string (1- (length string))) ?\n) string (concat string "\n")))
(while (not (file-exists-p file)) (sit-for (or period 0.25))))
(provide 'ob-comint)
;;; ob-comint.el ends here
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