lisp/ob-comint.el

   1 ;;; ob-comint.el --- org-babel functions for interaction with comint buffers
   2
   3 ;; Copyright (C) 2009-2012  Free Software Foundation, Inc.
   4
   5 ;; Author: Eric Schulte
   6 ;; Keywords: literate programming, reproducible research, comint
   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 <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; These functions build on comint to ease the sending and receiving
  27 ;; of commands and results from comint buffers.
  28
  29 ;; Note that the buffers in this file are analogous to sessions in
  30 ;; org-babel at large.
  31
  32 ;;; Code:
  33 (require 'ob)
  34 (require 'comint)
  35 (eval-when-compile (require 'cl))
  36 (declare-function with-parsed-tramp-file-name "tramp" (filename var &rest body))
  37 (declare-function tramp-flush-directory-property "tramp" (vec directory))
  38
  39 (defun org-babel-comint-buffer-livep (buffer)
  40   "Check if BUFFER is a comint buffer with a live process."
  41   (let ((buffer (if buffer (get-buffer buffer))))
  42     (and buffer (buffer-live-p buffer) (get-buffer-process buffer) buffer)))
  43
  44 (defmacro org-babel-comint-in-buffer (buffer &rest body)
  45   "Check BUFFER and execute BODY.
  46 BUFFER is checked with `org-babel-comint-buffer-livep'.  BODY is
  47 executed inside the protection of `save-excursion' and
  48 `save-match-data'."
  49   (declare (indent 1))
  50   `(save-excursion
  51      (save-match-data
  52        (unless (org-babel-comint-buffer-livep ,buffer)
  53          (error "buffer %s doesn't exist or has no process" ,buffer))
  54        (set-buffer ,buffer)
  55        ,@body)))
  56 (def-edebug-spec org-babel-comint-in-buffer (form body))
  57
  58 (defmacro org-babel-comint-with-output (meta &rest body)
  59   "Evaluate BODY in BUFFER and return process output.
  60 Will wait until EOE-INDICATOR appears in the output, then return
  61 all process output.  If REMOVE-ECHO and FULL-BODY are present and
  62 non-nil, then strip echo'd body from the returned output.  META
  63 should be a list containing the following where the last two
  64 elements are optional.
  65
  66  (BUFFER EOE-INDICATOR REMOVE-ECHO FULL-BODY)
  67
  68 This macro ensures that the filter is removed in case of an error
  69 or user `keyboard-quit' during execution of body."
  70   (declare (indent 1))
  71   (let ((buffer (car meta))
  72         (eoe-indicator (cadr meta))
  73         (remove-echo (cadr (cdr meta)))
  74         (full-body (cadr (cdr (cdr meta)))))
  75     `(org-babel-comint-in-buffer ,buffer
  76        (let ((string-buffer "") dangling-text raw)
  77          (flet ((my-filt (text)
  78                          (setq string-buffer (concat string-buffer text))))
  79            ;; setup filter
  80            (add-hook 'comint-output-filter-functions 'my-filt)
  81            (unwind-protect
  82                (progn
  83                  ;; got located, and save dangling text
  84                  (goto-char (process-mark (get-buffer-process (current-buffer))))
  85                  (let ((start (point))
  86                        (end (point-max)))
  87                    (setq dangling-text (buffer-substring start end))
  88                    (delete-region start end))
  89                  ;; pass FULL-BODY to process
  90                  ,@body
  91                  ;; wait for end-of-evaluation indicator
  92                  (while (progn
  93                           (goto-char comint-last-input-end)
  94                           (not (save-excursion
  95                                  (and (re-search-forward
  96                                        (regexp-quote ,eoe-indicator) nil t)
  97                                       (re-search-forward
  98                                        comint-prompt-regexp nil t)))))
  99                    (accept-process-output (get-buffer-process (current-buffer)))
 100                    ;; thought the following this would allow async
 101                    ;; background running, but I was wrong...
 102                    ;; (run-with-timer .5 .5 'accept-process-output
 103                    ;;            (get-buffer-process (current-buffer)))
 104                    )
 105                  ;; replace cut dangling text
 106                  (goto-char (process-mark (get-buffer-process (current-buffer))))
 107                  (insert dangling-text))
 108              ;; remove filter
 109              (remove-hook 'comint-output-filter-functions 'my-filt)))
 110          ;; remove echo'd FULL-BODY from input
 111          (if (and ,remove-echo ,full-body
 112                   (string-match
 113                    (replace-regexp-in-string
 114                     "\n" "[\r\n]+" (regexp-quote (or ,full-body "")))
 115                    string-buffer))
 116              (setq raw (substring string-buffer (match-end 0))))
 117          (split-string string-buffer comint-prompt-regexp)))))
 118 (def-edebug-spec org-babel-comint-with-output (form body))
 119
 120 (defun org-babel-comint-input-command (buffer cmd)
 121   "Pass CMD to BUFFER.
 122 The input will not be echoed."
 123   (org-babel-comint-in-buffer buffer
 124     (goto-char (process-mark (get-buffer-process buffer)))
 125     (insert cmd)
 126     (comint-send-input)
 127     (org-babel-comint-wait-for-output buffer)))
 128
 129 (defun org-babel-comint-wait-for-output (buffer)
 130   "Wait until output arrives from BUFFER.
 131 Note: this is only safe when waiting for the result of a single
 132 statement (not large blocks of code)."
 133   (org-babel-comint-in-buffer buffer
 134     (while (progn
 135              (goto-char comint-last-input-end)
 136              (not (and (re-search-forward comint-prompt-regexp nil t)
 137                        (goto-char (match-beginning 0))
 138                        (string= (face-name (face-at-point))
 139                                 "comint-highlight-prompt"))))
 140       (accept-process-output (get-buffer-process buffer)))))
 141
 142 (defun org-babel-comint-eval-invisibly-and-wait-for-file
 143   (buffer file string &optional period)
 144   "Evaluate STRING in BUFFER invisibly.
 145 Don't return until FILE exists. Code in STRING must ensure that
 146 FILE exists at end of evaluation."
 147   (unless (org-babel-comint-buffer-livep buffer)
 148     (error "buffer %s doesn't exist or has no process" buffer))
 149   (if (file-exists-p file) (delete-file file))
 150   (process-send-string
 151    (get-buffer-process buffer)
 152    (if (string-match "\n$" string) string (concat string "\n")))
 153   ;; From Tramp 2.1.19 the following cache flush is not necessary
 154   (if (file-remote-p default-directory)
 155       (let (v)
 156         (with-parsed-tramp-file-name default-directory nil
 157           (tramp-flush-directory-property v ""))))
 158   (while (not (file-exists-p file)) (sit-for (or period 0.25))))
 159
 160 (provide 'ob-comint)
 161
 162
 163
 164 ;;; ob-comint.el ends here