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428
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1 ;;; process.el --- commands for subprocesses; split out of simple.el
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2
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3 ;; Copyright (C) 1985-7, 1993,4, 1997 Free Software Foundation, Inc.
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853
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4 ;; Copyright (C) 1995, 2000, 2001, 2002 Ben Wing.
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5
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6 ;; Author: Ben Wing
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7 ;; Maintainer: XEmacs Development Team
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8 ;; Keywords: internal, processes, dumped
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9
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10 ;; This file is part of XEmacs.
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11
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12 ;; XEmacs is free software; you can redistribute it and/or modify it
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13 ;; under the terms of the GNU General Public License as published by
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14 ;; the Free Software Foundation; either version 2, or (at your option)
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15 ;; any later version.
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16
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17 ;; XEmacs is distributed in the hope that it will be useful, but
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18 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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19 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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20 ;; General Public License for more details.
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21
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22 ;; You should have received a copy of the GNU General Public License
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444
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23 ;; along with XEmacs; see the file COPYING. If not, write to the
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428
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24 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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25 ;; Boston, MA 02111-1307, USA.
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26
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771
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27 ;;; Synched up with: FSF 19.30, except for setenv/getenv (synched with FSF
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28 ;;; 21.0.105).
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428
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29
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442
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30 ;;; Authorship:
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31
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32 ;; Created 1995 by Ben Wing during Mule work -- some commands split out
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33 ;; of simple.el and wrappers of *-internal functions created so they could
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34 ;; be redefined in a Mule world.
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35 ;; Lisp definition of call-process-internal added Mar. 2000 by Ben Wing.
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36
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428
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37 ;;; Commentary:
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38
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39 ;; This file is dumped with XEmacs.
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40
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41 ;;; Code:
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42
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43
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44 (defgroup processes nil
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45 "Process, subshell, compilation, and job control support."
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46 :group 'external
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47 :group 'development)
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48
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49 (defgroup processes-basics nil
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50 "Basic stuff dealing with processes."
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51 :group 'processes)
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52
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53 (defgroup execute nil
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54 "Executing external commands."
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55 :group 'processes)
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56
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611
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57 ;; This may be changed to "/c" in win32-native.el.
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58
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59 (defvar shell-command-switch "-c"
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60 "Switch used to have the shell execute its command line argument.")
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61
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62 (defun start-process-shell-command (name buffer &rest args)
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63 "Start a program in a subprocess. Return the process object for it.
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64 NAME is name for process. It is modified if necessary to make it unique.
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65 BUFFER is the buffer or (buffer-name) to associate with the process.
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66 Process output goes at end of that buffer, unless you specify
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67 an output stream or filter function to handle the output.
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68 BUFFER may be also nil, meaning that this process is not associated
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69 with any buffer
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70 Third arg is command name, the name of a shell command.
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71 Remaining arguments are the arguments for the command.
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72 Wildcards and redirection are handled as usual in the shell."
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73 ;; We used to use `exec' to replace the shell with the command,
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74 ;; but that failed to handle (...) and semicolon, etc.
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75 (start-process name buffer shell-file-name shell-command-switch
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76 (mapconcat #'identity args " ")))
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77
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862
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78 (defun process-synchronize-point (proc)
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79 "Set the point(s) in buffer and stderr-buffer according to the process mark."
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80 ;; We need this because the documentation says to insert *BEFORE* point,
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81 ;; but we end up inserting after because only the process mark moves
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82 ;; forward, not point. We synchronize after every place output might
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83 ;; happen, in sentinels, and in an unwind-protect, to make *SURE* that
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84 ;; point is correct. (We could do this more easily and perhaps more
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85 ;; safely using a process filter, but that would create a LOT of garbage
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86 ;; since all the data would get sent in strings.) We make this a separate
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87 ;; function, not an flet, due to dynamic binding problems -- the flet may
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88 ;; not still be in scope when the sentinel is called.
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89 (let ((pb (process-buffer proc))
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90 (pm (process-mark proc)))
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91 (if (and pb (buffer-live-p pb) (marker-buffer pm))
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92 (goto-char pm pb))
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93 (if (process-has-separate-stderr-p proc)
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94 (let ((pseb (process-stderr-buffer proc))
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95 (psem (process-stderr-mark proc)))
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96 (if (and pseb (not (eq pb pseb))
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97 (buffer-live-p pseb)
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98 (marker-buffer psem))
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99 (goto-char psem pseb))))))
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100
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853
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101 (defun call-process-internal (program &optional infile buffer display
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102 &rest args)
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103 "Internal function to call PROGRAM synchronously in separate process.
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104 Lisp callers should use `call-process' or `call-process-region'.
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105
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442
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106 The program's input comes from file INFILE (nil means `/dev/null').
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107 XEmacs feature: INFILE can also be a list of (BUFFER [START [END]]), i.e.
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108 a list of one to three elements, consisting of a buffer and optionally
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109 a start position or start and end position. In this case, input comes
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110 from the buffer, starting from START (defaults to the beginning of the
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111 buffer) and ending at END (defaults to the end of the buffer).
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112
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113 Insert output in BUFFER before point; t means current buffer;
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114 nil for BUFFER means discard it; 0 means discard and don't wait.
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115 If BUFFER is a string, then find or create a buffer with that name,
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116 then insert the output in that buffer, before point.
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442
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117 BUFFER can also have the form (REAL-BUFFER STDERR-FILE); in that case,
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118 REAL-BUFFER says what to do with standard output, as above,
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119 while STDERR-FILE says what to do with standard error in the child.
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120 STDERR-FILE may be nil (discard standard error output),
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121 t (mix it with ordinary output), a file name string, or (XEmacs feature)
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122 a buffer object. If STDERR-FILE is a buffer object (but not the name of
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123 a buffer, since that would be interpreted as a file), the standard error
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124 output will be inserted into the buffer before point.
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442
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125
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126 Fourth arg DISPLAY non-nil means redisplay buffer as output is inserted.
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127 Remaining arguments are strings passed as command arguments to PROGRAM.
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128
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129 If BUFFER is 0, returns immediately with value nil.
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130 Otherwise waits for PROGRAM to terminate and returns a numeric exit status
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131 or a signal description string. If you quit, the process is first killed
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132 with SIGINT, then with SIGKILL if you quit again before the process exits.
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133
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134 Coding systems for the process are the same as for `start-process-internal'."
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135 (let (proc inbuf errbuf kill-inbuf kill-errbuf no-wait start end)
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136 ;; first set up an unwind-protect to clean everything up. this will:
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137 ;;
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138 ;; -- kill the process. (when we're not waiting for it to finish, we
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139 ;; set PROC to nil when we're ready to exit so this doesn't happen --
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140 ;; if we're interrupted before we're ready to exit, we should still
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141 ;; kill the process)
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142 ;; -- kill temporary buffers created to handle I/O to or from a file.
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143 ;; KILL-INBUF/KILL-ERRBUF tell us if we should do so.
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144 ;;
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145 ;; note that we need to be *very* careful in this code to handle C-g
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146 ;; at any point.
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147 (unwind-protect
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148 (progn
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149 ;; first handle INFILE.
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150 (cond ((stringp infile)
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151 (setq infile (expand-file-name infile))
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152 (setq kill-inbuf t)
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153 (setq inbuf (generate-new-buffer "*call-process*"))
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154 ;; transfer the exact contents of the file to the process.
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155 ;; we do that by reading in and writing out in
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156 ;; binary. #### is this even correct? should we be doing
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157 ;; the same thing with stderr? if so we'd need a way of
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158 ;; controlling the stderr coding system separate from
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159 ;; everything else.
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160 (with-current-buffer inbuf
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161 ;; Make sure this works with jka-compr
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162 (let ((file-name-handler-alist nil))
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163 (insert-file-contents-internal infile nil nil nil nil
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164 'binary))
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165 (setq start (point-min) end (point-max))))
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166 ((consp infile)
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167 (setq inbuf (get-buffer (car infile)))
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168 (setq start (or (nth 1 infile) (point-min inbuf)))
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169 (setq end (or (nth 2 infile) (point-max inbuf))))
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170 ((null infile) nil)
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171 (t
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172 (error 'wrong-type-argument
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173 "Must be filename or (BUFFER [START [END]])"
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174 infile)))
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175 ;; now handle BUFFER
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176 (let ((stderr (if (consp buffer) (second buffer) t)))
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177 (if (consp buffer) (setq buffer (car buffer)))
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178 (setq buffer
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179 (cond ((null buffer) nil)
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180 ((eq buffer t) (current-buffer))
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181 ;; use integerp for compatibility with existing
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182 ;; call-process rmsism.
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183 ((integerp buffer) (setq no-wait t) nil)
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184 (t (get-buffer-create buffer))))
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185 (when (and stderr (not (eq t stderr)))
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186 ;; both ERRBUF and STDERR being non-nil indicates to the
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187 ;; code below that STDERR is a file and we should write
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188 ;; ERRBUF to it; so clear out STDERR if we don't want this.
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189 (if (bufferp stderr) (setq errbuf stderr stderr nil)
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442
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190 (setq stderr (expand-file-name stderr))
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853
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191 (setq kill-errbuf t)
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192 (setq errbuf (generate-new-buffer "*call-process*"))))
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193 ;; now start process. using a pty causes all sorts of
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194 ;; weirdness, at least under cygwin, when there's input. #### i
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195 ;; don't know what's going wrong and whether it's a cygwin-only
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196 ;; problem. suffice to say that there were NO pty connections
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197 ;; in the old version.
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198 (let ((process-connection-type nil))
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442
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199 (setq proc
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200 (apply 'start-process-internal "*call-process*"
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853
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201 (if (eq t stderr) buffer (list buffer errbuf))
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202 program args)))
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203 ;; see comment above where the data was read from the file.
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204 (if kill-inbuf
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205 (set-process-output-coding-system proc 'binary))
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206 ;; point mark/stderr-mark at the right place (by default it's
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207 ;; end of buffer).
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208 (if buffer
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209 (set-marker (process-mark proc) (point buffer) buffer))
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210 (if errbuf
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211 (set-marker (process-stderr-mark proc) (point errbuf) errbuf))
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859
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212 ;; now do I/O, very carefully! the unwind-protect makes sure
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213 ;; to clear out the sentinel, since it does a `throw', which
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214 ;; would have no catch (or writes to a file -- we only want
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215 ;; this on normal exit)
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216 (unwind-protect
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217 ;; if not NO-WAIT, set a sentinel to return the exit
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218 ;; status. it will throw to this catch so we can exit
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219 ;; properly.
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220 (catch 'call-process-done
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221 (set-process-sentinel
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222 proc
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223 (cond
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224 ((and no-wait errbuf stderr)
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225 ;; we're trying really really hard to emulate
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226 ;; the old call-process, which would save the
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227 ;; stderr to a file even if discarding output. so
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228 ;; we set a sentinel to save the output when
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229 ;; we finish.
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230 ;;
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231 ;; #### not clear if we should be doing this.
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232 ;;
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233 ;; NOTE NOTE NOTE: Due to the total bogosity of
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234 ;; dynamic scoping, and the lack of closures, we
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235 ;; have to be careful how we write the first
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236 ;; sentinel below since it may be executed after
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237 ;; this function has returned -- thus we fake a
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238 ;; closure. (This doesn't apply to the second one,
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239 ;; which only gets executed within the
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240 ;; unwind-protect.)
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241 `(lambda (proc status)
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242 (set-process-sentinel proc nil)
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243 (process-synchronize-point proc)
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244 (with-current-buffer ,errbuf
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245 (write-region-internal
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246 1 (1+ (buffer-size))
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247 ,stderr
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248 nil 'major-rms-kludge-city nil
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249 coding-system-for-write))
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250 (kill-buffer ,errbuf)))
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251 (no-wait nil)
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252 (t
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253 ;; normal sentinel: maybe write out stderr and return
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254 ;; status.
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255 #'(lambda (proc status)
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256 (process-synchronize-point proc)
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257 (when (and errbuf stderr)
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258 (with-current-buffer errbuf
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259 (write-region-internal
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260 1 (1+ (buffer-size)) stderr
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261 nil 'major-rms-kludge-city nil
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262 coding-system-for-write)))
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263 (cond ((eq 'exit (process-status proc))
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264 (set-process-sentinel proc nil)
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265 (throw 'call-process-done
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266 (process-exit-status proc)))
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267 ((eq 'signal (process-status proc))
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268 (set-process-sentinel proc nil)
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269 (throw 'call-process-done status)))))))
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270 (if (not no-wait)
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271 ;; we're waiting. send the input and loop forever,
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272 ;; handling process output and maybe redisplaying.
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273 ;; exit happens through the sentinel or C-g. if
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274 ;; C-g, send SIGINT the first time, EOF if not
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275 ;; already done so (might make the process exit),
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276 ;; and keep waiting. Another C-g will exit the
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277 ;; whole function, and the unwind-protect will
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278 ;; kill the process. (Hence the documented semantics
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279 ;; of SIGINT/SIGKILL.)
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280 (let (eof-sent)
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281 (condition-case nil
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282 (progn
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283 (when inbuf
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284 (process-send-region proc start end inbuf))
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285 (process-send-eof proc)
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286 (setq eof-sent t)
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287 (while t
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288 (accept-process-output proc)
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289 (process-synchronize-point proc)
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290 (if display (sit-for 0))))
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291 (quit
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292 (process-send-signal 'SIGINT proc)
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293 (unless eof-sent
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294 (process-send-eof proc))
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295 (while t
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296 (accept-process-output proc)
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297 (process-synchronize-point proc)
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298 (if display (sit-for 0))))))
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299 ;; discard and no wait: send the input, set PROC
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300 ;; and ERRBUF to nil so that the unwind-protect
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301 ;; forms don't erase the sentinel, kill the process,
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302 ;; or kill ERRBUF (the sentinel does that), and exit.
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303 (when inbuf
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304 (process-send-region proc start end inbuf))
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305 (process-send-eof proc)
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306 (setq errbuf nil)
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307 (setq proc nil)))
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308 ;; inner unwind-protect, once we're ready to do I/O.
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309 (when proc
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310 (set-process-sentinel proc nil)
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311 (process-synchronize-point proc)))))
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859
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312 ;; outer unwind-protect forms, to make sure we always clean up.
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853
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313 (if (and inbuf kill-inbuf) (kill-buffer inbuf))
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314 (if (and errbuf kill-errbuf) (kill-buffer errbuf))
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315 (condition-case nil
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316 (if (and proc (process-live-p proc)) (kill-process proc))
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317 (error nil)))))
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428
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318
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319
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320 (defun shell-command (command &optional output-buffer)
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321 "Execute string COMMAND in inferior shell; display output, if any.
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322
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323 If COMMAND ends in ampersand, execute it asynchronously.
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324 The output appears in the buffer `*Async Shell Command*'.
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325 That buffer is in shell mode.
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326
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327 Otherwise, COMMAND is executed synchronously. The output appears in the
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328 buffer `*Shell Command Output*'.
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329 If the output is one line, it is displayed in the echo area *as well*,
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330 but it is nonetheless available in buffer `*Shell Command Output*',
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331 even though that buffer is not automatically displayed.
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332 If there is no output, or if output is inserted in the current buffer,
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333 then `*Shell Command Output*' is deleted.
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334
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335 The optional second argument OUTPUT-BUFFER, if non-nil,
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336 says to put the output in some other buffer.
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337 If OUTPUT-BUFFER is a buffer or buffer name, put the output there.
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338 If OUTPUT-BUFFER is not a buffer and not nil,
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339 insert output in current buffer. (This cannot be done asynchronously.)
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340 In either case, the output is inserted after point (leaving mark after it)."
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341 (interactive (list (read-shell-command "Shell command: ")
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342 current-prefix-arg))
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343 (if (and output-buffer
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344 (not (or (bufferp output-buffer) (stringp output-buffer))))
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345 (progn (barf-if-buffer-read-only)
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444
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346 (push-mark nil (not (interactive-p)))
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428
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347 ;; We do not use -f for csh; we will not support broken use of
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348 ;; .cshrcs. Even the BSD csh manual says to use
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349 ;; "if ($?prompt) exit" before things which are not useful
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350 ;; non-interactively. Besides, if someone wants their other
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351 ;; aliases for shell commands then they can still have them.
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352 (call-process shell-file-name nil t nil
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353 shell-command-switch command)
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354 (exchange-point-and-mark t))
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355 ;; Preserve the match data in case called from a program.
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356 (save-match-data
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357 (if (string-match "[ \t]*&[ \t]*$" command)
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358 ;; Command ending with ampersand means asynchronous.
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359 (progn
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776
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360 (if-fboundp 'background
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361 (background (substring command 0
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362 (match-beginning 0)))
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363 (error
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364 'unimplemented
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365 "backgrounding a shell command requires package `background'")))
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366
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428
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367 (shell-command-on-region (point) (point) command output-buffer)))))
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368
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369 ;; We have a sentinel to prevent insertion of a termination message
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370 ;; in the buffer itself.
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371 (defun shell-command-sentinel (process signal)
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372 (if (memq (process-status process) '(exit signal))
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373 (message "%s: %s."
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374 (car (cdr (cdr (process-command process))))
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375 (substring signal 0 -1))))
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376
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377 (defun shell-command-on-region (start end command
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378 &optional output-buffer replace)
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379 "Execute string COMMAND in inferior shell with region as input.
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380 Normally display output (if any) in temp buffer `*Shell Command Output*';
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381 Prefix arg means replace the region with it.
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382
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383 The noninteractive arguments are START, END, COMMAND, OUTPUT-BUFFER, REPLACE.
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384 If REPLACE is non-nil, that means insert the output
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385 in place of text from START to END, putting point and mark around it.
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386
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387 If the output is one line, it is displayed in the echo area,
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388 but it is nonetheless available in buffer `*Shell Command Output*'
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389 even though that buffer is not automatically displayed.
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390 If there is no output, or if output is inserted in the current buffer,
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391 then `*Shell Command Output*' is deleted.
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392
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393 If the optional fourth argument OUTPUT-BUFFER is non-nil,
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394 that says to put the output in some other buffer.
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395 If OUTPUT-BUFFER is a buffer or buffer name, put the output there.
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396 If OUTPUT-BUFFER is not a buffer and not nil,
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397 insert output in the current buffer.
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398 In either case, the output is inserted after point (leaving mark after it)."
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399 (interactive (let ((string
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400 ;; Do this before calling region-beginning
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401 ;; and region-end, in case subprocess output
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402 ;; relocates them while we are in the minibuffer.
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403 (read-shell-command "Shell command on region: ")))
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404 ;; call-interactively recognizes region-beginning and
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405 ;; region-end specially, leaving them in the history.
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406 (list (region-beginning) (region-end)
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407 string
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408 current-prefix-arg
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409 current-prefix-arg)))
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410 (if (or replace
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411 (and output-buffer
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412 (not (or (bufferp output-buffer) (stringp output-buffer)))))
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413 ;; Replace specified region with output from command.
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414 (let ((swap (and replace (< start end))))
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415 ;; Don't muck with mark unless REPLACE says we should.
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416 (goto-char start)
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417 (and replace (push-mark))
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418 (call-process-region start end shell-file-name t t nil
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419 shell-command-switch command)
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420 (let ((shell-buffer (get-buffer "*Shell Command Output*")))
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421 (and shell-buffer (not (eq shell-buffer (current-buffer)))
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422 (kill-buffer shell-buffer)))
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423 ;; Don't muck with mark unless REPLACE says we should.
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424 (and replace swap (exchange-point-and-mark t)))
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425 ;; No prefix argument: put the output in a temp buffer,
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426 ;; replacing its entire contents.
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427 (let ((buffer (get-buffer-create
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428 (or output-buffer "*Shell Command Output*")))
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429 (success nil)
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430 (exit-status nil)
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431 (directory default-directory))
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432 (unwind-protect
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433 (if (eq buffer (current-buffer))
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434 ;; If the input is the same buffer as the output,
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435 ;; delete everything but the specified region,
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436 ;; then replace that region with the output.
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437 (progn (setq buffer-read-only nil)
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438 (delete-region (max start end) (point-max))
|
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921
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439 (delete-region (point-min) (min start end))
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428
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440 (setq exit-status
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441 (call-process-region (point-min) (point-max)
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442 shell-file-name t t nil
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443 shell-command-switch command))
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444 (setq success t))
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445 ;; Clear the output buffer,
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446 ;; then run the command with output there.
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447 (save-excursion
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448 (set-buffer buffer)
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449 (setq buffer-read-only nil)
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450 ;; XEmacs change
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451 (setq default-directory directory)
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452 (erase-buffer))
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|
453 (setq exit-status
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454 (call-process-region start end shell-file-name
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455 nil buffer nil
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456 shell-command-switch command))
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457 (setq success t))
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458 ;; Report the amount of output.
|
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|
459 (let ((lines (save-excursion
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460 (set-buffer buffer)
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|
461 (if (= (buffer-size) 0)
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462 0
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463 (count-lines (point-min) (point-max))))))
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|
464 (cond ((= lines 0)
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465 (if success
|
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|
466 (display-message
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|
467 'command
|
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|
468 (if (eql exit-status 0)
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|
469 "(Shell command succeeded with no output)"
|
|
|
470 "(Shell command failed with no output)")))
|
|
|
471 (kill-buffer buffer))
|
|
|
472 ((and success (= lines 1))
|
|
|
473 (message "%s"
|
|
|
474 (save-excursion
|
|
|
475 (set-buffer buffer)
|
|
|
476 (goto-char (point-min))
|
|
|
477 (buffer-substring (point)
|
|
|
478 (progn (end-of-line)
|
|
|
479 (point))))))
|
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|
480 (t
|
|
|
481 (set-window-start (display-buffer buffer) 1))))))))
|
|
|
482
|
|
|
483 (defun shell-quote-argument (argument)
|
|
|
484 "Quote an argument for passing as argument to an inferior shell."
|
|
442
|
485 (if (and (eq system-type 'windows-nt)
|
|
|
486 (let ((progname (downcase (file-name-nondirectory
|
|
|
487 shell-file-name))))
|
|
|
488 (or (equal progname "command.com")
|
|
|
489 (equal progname "cmd.exe"))))
|
|
|
490 ;; the expectation is that you can take the result of
|
|
|
491 ;; shell-quote-argument and pass it to as an arg to
|
|
|
492 ;; (start-process shell-quote-argument ...) and have it end
|
|
|
493 ;; up as-is in the program's argv[] array. to do this, we
|
|
|
494 ;; need to protect against both the shell's and the program's
|
|
|
495 ;; quoting conventions (and our own conventions in
|
|
|
496 ;; mswindows-construct-process-command-line!). Putting quotes
|
|
|
497 ;; around shell metachars gets through the last two, and applying
|
|
|
498 ;; the normal VC runtime quoting works with practically all apps.
|
|
776
|
499 (declare-fboundp (mswindows-quote-one-vc-runtime-arg argument t))
|
|
611
|
500 (if (equal argument "")
|
|
|
501 "\"\""
|
|
|
502 ;; Quote everything except POSIX filename characters.
|
|
|
503 ;; This should be safe enough even for really weird shells.
|
|
|
504 (let ((result "") (start 0) end)
|
|
|
505 (while (string-match "[^-0-9a-zA-Z_./]" argument start)
|
|
|
506 (setq end (match-beginning 0)
|
|
|
507 result (concat result (substring argument start end)
|
|
|
508 "\\" (substring argument end (1+ end)))
|
|
|
509 start (1+ end)))
|
|
|
510 (concat result (substring argument start))))))
|
|
428
|
511
|
|
438
|
512 (defun shell-command-to-string (command)
|
|
|
513 "Execute shell command COMMAND and return its output as a string."
|
|
428
|
514 (with-output-to-string
|
|
|
515 (call-process shell-file-name nil t nil shell-command-switch command)))
|
|
|
516
|
|
438
|
517 (defalias 'exec-to-string 'shell-command-to-string)
|
|
771
|
518
|
|
|
519
|
|
|
520 ;; History list for environment variable names.
|
|
|
521 (defvar read-envvar-name-history nil)
|
|
|
522
|
|
|
523 (defun read-envvar-name (prompt &optional mustmatch)
|
|
|
524 "Read environment variable name, prompting with PROMPT.
|
|
|
525 Optional second arg MUSTMATCH, if non-nil, means require existing envvar name.
|
|
|
526 If it is also not t, RET does not exit if it does non-null completion."
|
|
|
527 (completing-read prompt
|
|
|
528 (mapcar (function
|
|
|
529 (lambda (enventry)
|
|
|
530 (list (substring enventry 0
|
|
|
531 (string-match "=" enventry)))))
|
|
|
532 process-environment)
|
|
|
533 nil mustmatch nil 'read-envvar-name-history))
|
|
|
534
|
|
|
535 ;; History list for VALUE argument to setenv.
|
|
|
536 (defvar setenv-history nil)
|
|
|
537
|
|
|
538 (defun setenv (variable &optional value unset)
|
|
|
539 "Set the value of the environment variable named VARIABLE to VALUE.
|
|
|
540 VARIABLE should be a string. VALUE is optional; if not provided or is
|
|
|
541 `nil', the environment variable VARIABLE will be removed.
|
|
|
542
|
|
|
543 Interactively, a prefix argument means to unset the variable.
|
|
|
544 Interactively, the current value (if any) of the variable
|
|
|
545 appears at the front of the history list when you type in the new value.
|
|
|
546
|
|
|
547 This function works by modifying `process-environment'."
|
|
|
548 (interactive
|
|
|
549 (if current-prefix-arg
|
|
|
550 (list (read-envvar-name "Clear environment variable: " 'exact) nil t)
|
|
|
551 (let ((var (read-envvar-name "Set environment variable: " nil)))
|
|
|
552 ;; Here finally we specify the args to call setenv with.
|
|
|
553 (list var (read-from-minibuffer (format "Set %s to value: " var)
|
|
|
554 nil nil nil 'setenv-history
|
|
|
555 (getenv var))))))
|
|
|
556 (if unset (setq value nil))
|
|
|
557 (if (string-match "=" variable)
|
|
|
558 (error "Environment variable name `%s' contains `='" variable)
|
|
|
559 (let ((pattern (concat "\\`" (regexp-quote (concat variable "="))))
|
|
|
560 (case-fold-search nil)
|
|
|
561 (scan process-environment)
|
|
|
562 found)
|
|
|
563 (if (string-equal "TZ" variable)
|
|
|
564 (set-time-zone-rule value))
|
|
|
565 (while scan
|
|
|
566 (cond ((string-match pattern (car scan))
|
|
|
567 (setq found t)
|
|
|
568 (if (eq nil value)
|
|
|
569 (setq process-environment (delq (car scan) process-environment))
|
|
|
570 (setcar scan (concat variable "=" value)))
|
|
|
571 (setq scan nil)))
|
|
|
572 (setq scan (cdr scan)))
|
|
|
573 (or found
|
|
|
574 (if value
|
|
|
575 (setq process-environment
|
|
|
576 (cons (concat variable "=" value)
|
|
|
577 process-environment)))))))
|
|
|
578
|
|
|
579 ;; already in C. Can't move it to Lisp too easily because it's needed
|
|
|
580 ;; extremely early in the Lisp loadup sequence.
|
|
|
581
|
|
|
582 ; (defun getenv (variable)
|
|
|
583 ; "Get the value of environment variable VARIABLE.
|
|
|
584 ; VARIABLE should be a string. Value is nil if VARIABLE is undefined in
|
|
|
585 ; the environment. Otherwise, value is a string.
|
|
|
586 ;
|
|
|
587 ; This function consults the variable `process-environment'
|
|
|
588 ; for its value."
|
|
|
589 ; (interactive (list (read-envvar-name "Get environment variable: " t)))
|
|
|
590 ; (let ((value (getenv-internal variable)))
|
|
|
591 ; (when (interactive-p)
|
|
|
592 ; (message "%s" (if value value "Not set")))
|
|
|
593 ; value))
|
|
|
594
|
|
|
595 (provide 'env) ;; Yuck. Formerly the above were in env.el, which did this
|
|
|
596 ;; provide.
|
|
428
|
597
|
|
|
598 ;;; process.el ends here
|
