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1 ;;; background.el --- fun with background jobs
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2
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3 ;; Copyright (C) 1988 Joe Keane <jk3k+@andrew.cmu.edu>
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4 ;; Keywords: processes
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5
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6 ;; This file is part of XEmacs.
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7 ;;
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8 ;; XEmacs is free software; you can redistribute it and/or modify
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9 ;; it under the terms of the GNU General Public License as published by
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10 ;; the Free Software Foundation; either version 2 of the License, or
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11 ;; (at your option) any later version.
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12 ;;
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13 ;; XEmacs is distributed in the hope that it will be useful,
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14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 ;; GNU General Public License for more details.
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17 ;;
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18 ;; You should have received a copy of the GNU General Public License
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19 ;; along with XEmacs; if not, write to the Free Software
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20 ;; Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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21
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22 ;; - Adapted to use comint and cleaned up somewhat. Olin Shivers 5/90
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23 ;; - Background failed to set the process buffer's working directory
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24 ;; in some cases. Fixed. Olin 6/14/90
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25 ;; - Background failed to strip leading cd's off the command string
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26 ;; after performing them. This screwed up relative pathnames.
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27 ;; Furthermore, the proc buffer's default dir wasn't initialised
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28 ;; to the user's buffer's default dir before doing the leading cd.
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29 ;; This also screwed up relative pathnames if the proc buffer already
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30 ;; existed and was set to a different default dir. Hopefully we've
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31 ;; finally got it right. The pwd is now reported in the buffer
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32 ;; just to let the user know. Bug reported by Piet Van Oostrum.
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33 ;; Olin 10/19/90
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34 ;; - Fixed up the sentinel to protect match-data around invocations.
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35 ;; Also slightly rearranged the cd match code for similar reasons.
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36 ;; Olin 7/16/91
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37 ;; - Dec 29 1995: changed for new stuff (shell-command-switch, second
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38 ;; arg to shell-command --> BUFFER-NAME arg to background) from
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39 ;; FSF 19.30. Ben Wing
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40
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41 (provide 'background)
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42 (require 'comint)
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43
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44 ;; user variables
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45 (defvar background-show t
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46 "*If non-nil, background jobs' buffers are shown when they're started.")
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47 (defvar background-select nil
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48 "*If non-nil, background jobs' buffers are selected when they're started.")
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49
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50 (defun background (command &optional buffer-name)
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51 "Run COMMAND in the background like csh.
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52 A message is displayed when the job starts and finishes. The buffer is in
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53 comint mode, so you can send input and signals to the job. The process object
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54 is returned if anyone cares. See also comint-mode and the variables
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55 background-show and background-select.
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56
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57 Optional second argument BUFFER-NAME is a buffer to insert the output into.
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58 If omitted, a buffer name is constructed from the command run."
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59 (interactive "s%% ")
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60 (let ((job-number 1)
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61 job-name
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62 (dir default-directory))
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63 (while (get-process (setq job-name (format "background-%d" job-number)))
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64 (setq job-number (1+ job-number)))
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65 (or buffer-name
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66 (setq buffer-name (format "*%s*" job-name)))
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67 (if background-select (pop-to-buffer buffer-name)
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68 (if background-show (with-output-to-temp-buffer buffer-name)) ; cute
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69 (set-buffer (get-buffer-create buffer-name)))
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70 (erase-buffer)
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71
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72 (setq default-directory dir) ; Do this first, in case cd is relative path.
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73 (if (string-match "^cd[\t ]+\\([^\t ;]+\\)[\t ]*;[\t ]*" command)
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74 (let ((dir (substring command (match-beginning 1) (match-end 1))))
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75 (setq command (substring command (match-end 0)))
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76 (setq default-directory
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77 (file-name-as-directory (expand-file-name dir)))))
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78
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79 (insert "--- working directory: " default-directory
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80 "\n% " command ?\n)
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81
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82 (let ((proc (get-buffer-process
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83 (comint-exec buffer-name job-name shell-file-name
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84 nil (list shell-command-switch command)))))
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85 (comint-mode)
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86 ;; COND because the proc may have died before the G-B-P is called.
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87 (cond (proc (set-process-sentinel proc 'background-sentinel)
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88 (message "[%d] %d" job-number (process-id proc))))
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89 (setq mode-name "Background")
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90 proc)))
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91
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92
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93 (defun background-sentinel (process msg)
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94 "Called when a background job changes state."
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95 (let ((ms (match-data))) ; barf
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96 (unwind-protect
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97 (let ((msg (cond ((string= msg "finished\n") "Done")
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98 ((string-match "^exited" msg)
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99 (concat "Exit " (substring msg 28 -1)))
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100 ((zerop (length msg)) "Continuing")
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101 (t (concat (upcase (substring msg 0 1))
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102 (substring msg 1 -1))))))
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103 (message "[%s] %s %s" (process-name process)
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104 msg
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105 (nth 2 (process-command process)))
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106 (if (null (buffer-name (process-buffer process)))
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107 (set-process-buffer process nil) ; WHY? Olin.
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108 (if (memq (process-status process) '(signal exit))
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109 (save-excursion
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110 (set-buffer (process-buffer process))
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111 (let ((at-end (eobp)))
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112 (save-excursion
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113 (goto-char (point-max))
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114 (insert ?\n msg ?
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115 (substring (current-time-string) 11 19) ?\n))
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116 (if at-end (goto-char (point-max))))
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117 (set-buffer-modified-p nil)))))
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118 (store-match-data ms))))
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