332 lines
13 KiB
EmacsLisp
332 lines
13 KiB
EmacsLisp
;;; ob-comint.el --- Babel Functions for Interaction with Comint Buffers -*- lexical-binding: t; -*-
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;; Copyright (C) 2009-2022 Free Software Foundation, Inc.
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;; Author: Eric Schulte
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;; Keywords: literate programming, reproducible research, comint
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;; URL: https://orgmode.org
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; These functions build on comint to ease the sending and receiving
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;; of commands and results from comint buffers.
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;; Note that the buffers in this file are analogous to sessions in
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;; org-babel at large.
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;;; Code:
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(require 'org-macs)
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(org-assert-version)
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(require 'ob-core)
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(require 'org-compat)
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(require 'comint)
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(defun org-babel-comint-buffer-livep (buffer)
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"Check if BUFFER is a comint buffer with a live process."
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(let ((buffer (when buffer (get-buffer buffer))))
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(and buffer (buffer-live-p buffer) (get-buffer-process buffer) buffer)))
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(defmacro org-babel-comint-in-buffer (buffer &rest body)
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"Check BUFFER and execute BODY.
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BUFFER is checked with `org-babel-comint-buffer-livep'. BODY is
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executed inside the protection of `save-excursion' and
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`save-match-data'."
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(declare (indent 1) (debug t))
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`(progn
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(unless (org-babel-comint-buffer-livep ,buffer)
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(error "Buffer %s does not exist or has no process" ,buffer))
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(save-match-data
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(with-current-buffer ,buffer
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(save-excursion
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(let ((comint-input-filter (lambda (_input) nil)))
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,@body))))))
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(defmacro org-babel-comint-with-output (meta &rest body)
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"Evaluate BODY in BUFFER and return process output.
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Will wait until EOE-INDICATOR appears in the output, then return
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all process output. If REMOVE-ECHO and FULL-BODY are present and
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non-nil, then strip echo'd body from the returned output. META
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should be a list containing the following where the last two
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elements are optional.
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(BUFFER EOE-INDICATOR REMOVE-ECHO FULL-BODY)
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This macro ensures that the filter is removed in case of an error
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or user `keyboard-quit' during execution of body."
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(declare (indent 1) (debug (sexp body)))
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(let ((buffer (nth 0 meta))
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(eoe-indicator (nth 1 meta))
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(remove-echo (nth 2 meta))
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(full-body (nth 3 meta))
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(org-babel-comint-prompt-separator
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"org-babel-comint-prompt-separator"))
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`(org-babel-comint-in-buffer ,buffer
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(let* ((string-buffer "")
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(comint-output-filter-functions
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(cons (lambda (text)
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(setq string-buffer
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(concat
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string-buffer
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;; Upon concatenation, the prompt may no
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;; longer match `comint-prompt-regexp'.
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;; In particular, when the regexp has ^
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;; and the output does not contain
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;; trailing newline. Use more reliable
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;; match to split the output later.
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(replace-regexp-in-string
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comint-prompt-regexp
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,org-babel-comint-prompt-separator
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text))))
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comint-output-filter-functions))
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dangling-text)
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;; got located, and save dangling text
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(goto-char (process-mark (get-buffer-process (current-buffer))))
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(let ((start (point))
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(end (point-max)))
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(setq dangling-text (buffer-substring start end))
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(delete-region start end))
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;; pass FULL-BODY to process
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,@body
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;; wait for end-of-evaluation indicator
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(while (progn
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(goto-char comint-last-input-end)
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(not (save-excursion
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(and (re-search-forward
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(regexp-quote ,eoe-indicator) nil t)
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(re-search-forward
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comint-prompt-regexp nil t)))))
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(accept-process-output (get-buffer-process (current-buffer))))
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;; replace cut dangling text
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(goto-char (process-mark (get-buffer-process (current-buffer))))
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(insert dangling-text)
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;; remove echo'd FULL-BODY from input
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(when (and ,remove-echo ,full-body
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(string-match
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(replace-regexp-in-string
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"\n" "[\r\n]+" (regexp-quote (or ,full-body "")))
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string-buffer))
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(setq string-buffer (substring string-buffer (match-end 0))))
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(delete "" (split-string
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string-buffer
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,org-babel-comint-prompt-separator))))))
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(defun org-babel-comint-input-command (buffer cmd)
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"Pass CMD to BUFFER.
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The input will not be echoed."
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(org-babel-comint-in-buffer buffer
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(goto-char (process-mark (get-buffer-process buffer)))
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(insert cmd)
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(comint-send-input)
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(org-babel-comint-wait-for-output buffer)))
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(defun org-babel-comint-wait-for-output (buffer)
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"Wait until output arrives from BUFFER.
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Note: this is only safe when waiting for the result of a single
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statement (not large blocks of code)."
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(org-babel-comint-in-buffer buffer
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(while (progn
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(goto-char comint-last-input-end)
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(not (and (re-search-forward comint-prompt-regexp nil t)
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(goto-char (match-beginning 0)))))
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(accept-process-output (get-buffer-process buffer)))))
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(defun org-babel-comint-eval-invisibly-and-wait-for-file
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(buffer file string &optional period)
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"Evaluate STRING in BUFFER invisibly.
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Don't return until FILE exists. Code in STRING must ensure that
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FILE exists at end of evaluation."
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(unless (org-babel-comint-buffer-livep buffer)
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(error "Buffer %s does not exist or has no process" buffer))
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(when (file-exists-p file) (delete-file file))
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(process-send-string
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(get-buffer-process buffer)
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(if (= (aref string (1- (length string))) ?\n) string (concat string "\n")))
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(while (not (file-exists-p file)) (sit-for (or period 0.25))))
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;;; Async evaluation
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(defvar-local org-babel-comint-async-indicator nil
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"Regular expression that `org-babel-comint-async-filter' scans for.
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It should have 2 parenthesized expressions,
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e.g. \"org_babel_async_\\(start\\|end\\|file\\)_\\(.*\\)\". The
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first parenthesized expression determines whether the token is
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delimiting a result block, or whether the result is in a file.
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If delimiting a block, the second expression gives a UUID for the
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location to insert the result. Otherwise, the result is in a tmp
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file, and the second expression gives the file name.")
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(defvar-local org-babel-comint-async-buffers nil
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"List of Org mode buffers to check for Babel async output results.")
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(defvar-local org-babel-comint-async-file-callback nil
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"Callback to clean and insert Babel async results from a temp file.
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The callback function takes two arguments: the alist of params of the Babel
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source block, and the name of the temp file.")
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(defvar-local org-babel-comint-async-chunk-callback nil
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"Callback function to clean Babel async output results before insertion.
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Its single argument is a string consisting of output from the
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comint process. It should return a string that will be passed
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to `org-babel-insert-result'.")
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(defvar-local org-babel-comint-async-dangling nil
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"Dangling piece of the last process output, in case
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`org-babel-comint-async-indicator' is spread across multiple
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comint outputs due to buffering.")
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(defun org-babel-comint-use-async (params)
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"Determine whether to use session async evaluation.
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PARAMS are the header arguments as passed to
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`org-babel-execute:lang'."
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(let ((async (assq :async params))
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(session (assq :session params)))
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(and async
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(not org-babel-exp-reference-buffer)
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(not (equal (cdr async) "no"))
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(not (equal (cdr session) "none")))))
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(defun org-babel-comint-async-filter (string)
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"Captures Babel async output from comint buffer back to Org mode buffers.
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This function is added as a hook to `comint-output-filter-functions'.
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STRING contains the output originally inserted into the comint buffer."
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;; Remove outdated Org mode buffers
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(setq org-babel-comint-async-buffers
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(cl-loop for buf in org-babel-comint-async-buffers
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if (buffer-live-p buf)
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collect buf))
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(let* ((indicator org-babel-comint-async-indicator)
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(org-buffers org-babel-comint-async-buffers)
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(file-callback org-babel-comint-async-file-callback)
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(combined-string (concat org-babel-comint-async-dangling string))
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(new-dangling combined-string)
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;; list of UUID's matched by `org-babel-comint-async-indicator'
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uuid-list)
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(with-temp-buffer
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(insert combined-string)
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(goto-char (point-min))
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(while (re-search-forward indicator nil t)
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;; update dangling
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(setq new-dangling (buffer-substring (point) (point-max)))
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(cond ((equal (match-string 1) "end")
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;; save UUID for insertion later
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(push (match-string 2) uuid-list))
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((equal (match-string 1) "file")
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;; insert results from tmp-file
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(let ((tmp-file (match-string 2)))
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(cl-loop for buf in org-buffers
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until
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(with-current-buffer buf
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(save-excursion
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(goto-char (point-min))
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(when (search-forward tmp-file nil t)
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(org-babel-previous-src-block)
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(let* ((info (org-babel-get-src-block-info))
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(params (nth 2 info))
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(result-params
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(cdr (assq :result-params params))))
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(org-babel-insert-result
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(funcall file-callback
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(nth
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2 (org-babel-get-src-block-info))
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tmp-file)
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result-params info))
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t))))))))
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;; Truncate dangling to only the most recent output
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(when (> (length new-dangling) (length string))
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(setq new-dangling string)))
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(setq-local org-babel-comint-async-dangling new-dangling)
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(when uuid-list
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;; Search for results in the comint buffer
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(save-excursion
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(goto-char (point-max))
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(while uuid-list
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(re-search-backward indicator)
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(when (equal (match-string 1) "end")
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(let* ((uuid (match-string-no-properties 2))
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(res-str-raw
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(buffer-substring
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;; move point to beginning of indicator
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(- (match-beginning 0) 1)
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;; find the matching start indicator
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(cl-loop
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do (re-search-backward indicator)
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until (and (equal (match-string 1) "start")
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(equal (match-string 2) uuid))
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finally return (+ 1 (match-end 0)))))
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;; Apply callback to clean up the result
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(res-str (funcall org-babel-comint-async-chunk-callback
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res-str-raw)))
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;; Search for uuid in associated org-buffers to insert results
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(cl-loop for buf in org-buffers
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until (with-current-buffer buf
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(save-excursion
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(goto-char (point-min))
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(when (search-forward uuid nil t)
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(org-babel-previous-src-block)
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(let* ((info (org-babel-get-src-block-info))
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(params (nth 2 info))
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(result-params
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(cdr (assq :result-params params))))
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(org-babel-insert-result
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res-str result-params info))
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t))))
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;; Remove uuid from the list to search for
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(setq uuid-list (delete uuid uuid-list)))))))))
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(defun org-babel-comint-async-register
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(session-buffer org-buffer indicator-regexp
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chunk-callback file-callback)
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"Set local org-babel-comint-async variables in SESSION-BUFFER.
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ORG-BUFFER is added to `org-babel-comint-async-buffers' if not
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present. `org-babel-comint-async-indicator',
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`org-babel-comint-async-chunk-callback', and
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`org-babel-comint-async-file-callback' are set to
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INDICATOR-REGEXP, CHUNK-CALLBACK, and FILE-CALLBACK
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respectively."
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(org-babel-comint-in-buffer session-buffer
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(setq org-babel-comint-async-indicator indicator-regexp
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org-babel-comint-async-chunk-callback chunk-callback
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org-babel-comint-async-file-callback file-callback)
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(unless (memq org-buffer org-babel-comint-async-buffers)
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(setq org-babel-comint-async-buffers
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(cons org-buffer org-babel-comint-async-buffers)))
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(add-hook 'comint-output-filter-functions
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'org-babel-comint-async-filter nil t)))
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(defmacro org-babel-comint-async-delete-dangling-and-eval
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(session-buffer &rest body)
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"Remove dangling text in SESSION-BUFFER and evaluate BODY.
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This is analogous to `org-babel-comint-with-output', but meant
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for asynchronous output, and much shorter because inserting the
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result is delegated to `org-babel-comint-async-filter'."
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(declare (indent 1) (debug t))
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`(org-babel-comint-in-buffer ,session-buffer
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(goto-char (process-mark (get-buffer-process (current-buffer))))
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(delete-region (point) (point-max))
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,@body))
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(provide 'ob-comint)
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;;; ob-comint.el ends here
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