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0
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1 /* Editor command loop.
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2 Copyright (C) 1992, 1993, 1994 Free Software Foundation, Inc.
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3 Copyright (C) 1995, 1996 Ben Wing.
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: Mule 2.0. Not synched with FSF.
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23 This was renamed from keyboard.c. However, it only contains the
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24 command-loop stuff from FSF's keyboard.c; all the rest is in
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25 event*.c, console.c, or signal.c. */
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26
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27 /* #### This module purports to separate out the command-loop stuff
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28 from event-stream.c, but it doesn't really. Perhaps this file
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29 should just be merged into event-stream.c, given its shortness. */
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30
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31 #include <config.h>
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32 #include "lisp.h"
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33
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34 #include "buffer.h"
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35 #include "commands.h"
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36 #include "frame.h"
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37 #include "events.h"
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38 #include "macros.h"
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39 #include "window.h"
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40
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41 /* Current depth in recursive edits. */
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42 int command_loop_level;
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43
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44 /* Total number of times command_loop has read a key sequence. */
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45 int num_input_keys;
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46
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47 #ifndef LISP_COMMAND_LOOP
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48 /* Form to evaluate (if non-nil) when Emacs is started. */
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49 Lisp_Object Vtop_level;
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50 #else
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51 /* Function to call to evaluate to read and process events. */
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52 Lisp_Object Vcommand_loop;
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53 #endif /* LISP_COMMAND_LOOP */
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54
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55 Lisp_Object Venter_window_hook, Vleave_window_hook;
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56
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57 /* The error handler. */
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58 Lisp_Object Qcommand_error;
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59
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60 /* The emergency error handler, before we're ready. */
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61 Lisp_Object Qreally_early_error_handler;
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62
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63 static Lisp_Object command_loop_1 (Lisp_Object dummy);
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64
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65 /* There are two possible command loops -- one written entirely in
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66 C and one written mostly in Lisp, except stuff written in C for
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67 speed. The advantage of the Lisp command loop is that the user
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68 can specify their own command loop to use by changing the variable
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69 `command-loop'. Its disadvantage is that it's slow. */
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70
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71 static Lisp_Object
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72 default_error_handler (Lisp_Object data)
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73 {
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74 int speccount = specpdl_depth ();
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75
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76 Fding (Qnil, Qnil, Qnil);
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77 zmacs_deactivate_region ();
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78 Fdiscard_input ();
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79 specbind (Qinhibit_quit, Qt);
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80 Vstandard_output = Qt;
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81 Vstandard_input = Qt;
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82 Vexecuting_macro = Qnil;
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83 clear_echo_area (selected_frame (), Qnil, 0);
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84 data = Fprin1_to_string (data, Qnil);
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16
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85 message ("Error: %s", XSTRING_DATA (data));
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0
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86 check_quit (); /* make Vquit_flag accurate */
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87 Vquit_flag = Qnil;
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88 return (unbind_to (speccount, Qt));
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89 }
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90
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91 DEFUN ("really-early-error-handler", Freally_early_error_handler,
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92 Sreally_early_error_handler, 1, 1, 0 /*
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93 You should almost certainly not be using this.
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94 */ )
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95 (x)
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96 Lisp_Object x;
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97 {
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98 /* This is an error handler used when we're running temacs and when
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99 we're in the early stages of XEmacs. No errors ought to be
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100 occurring in those cases (or they ought to be trapped and
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101 dealt with elsewhere), but if an error slips through, we need
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102 to deal with it. We could write this function in Lisp (and it
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103 used to be this way, at the beginning of loadup.el), but we do
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104 it this way in case an error occurs before we get to loading
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105 loadup.el. Note that there is also an `early-error-handler',
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106 used in startup.el to catch more reasonable errors that
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107 might occur during startup if the sysadmin or whoever fucked
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108 up. This function is more conservative in what it does
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109 and is used only as a last resort, indicating that the
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110 programmer himself fucked up somewhere. */
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111 stderr_out ("*** Error in XEmacs initialization");
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112 Fprint (x, Qexternal_debugging_output);
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113 stderr_out ("*** Backtrace\n");
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114 Fbacktrace (Qexternal_debugging_output, Qt);
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115 stderr_out ("*** Killing XEmacs\n");
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116 return Fkill_emacs (make_int (-1));
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117 }
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118
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119
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120 /**********************************************************************/
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121 /* Command-loop (in C) */
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122 /**********************************************************************/
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123
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124 #ifndef LISP_COMMAND_LOOP
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125
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126 /* The guts of the command loop are in command_loop_1(). This function
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127 doesn't catch errors, though -- that's the job of command_loop_2(),
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128 which is a condition-case wrapper around command_loop_1().
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129 command_loop_1() never returns, but may get thrown out of.
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130
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131 When an error occurs, cmd_error() is called, which usually
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132 invokes the Lisp error handler in `command-error'; however,
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133 a default error handler is provided if `command-error' is nil
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134 (e.g. during startup). The purpose of the error handler is
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135 simply to display the error message and do associated cleanup;
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136 it does not need to throw anywhere. When the error handler
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137 finishes, the condition-case in command_loop_2() will finish and
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138 command_loop_2() will reinvoke command_loop_1().
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139
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140 command_loop_2() is invoked from three places: from
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141 initial_command_loop() (called from main() at the end of
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142 internal initialization), from the Lisp function `recursive-edit',
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143 and from call_command_loop().
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144
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145 call_command_loop() is called when a macro is started and when the
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146 minibuffer is entered; normal termination of the macro or
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147 minibuffer causes a throw out of the recursive command loop. (To
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148 'execute-kbd-macro for macros and 'exit for minibuffers. Note also
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149 that the low-level minibuffer-entering function,
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150 `read-minibuffer-internal', provides its own error handling and
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151 does not need command_loop_2()'s error encapsulation; so it tells
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152 call_command_loop() to invoke command_loop_1() directly.)
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153
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154 Note that both read-minibuffer-internal and recursive-edit set
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155 up a catch for 'exit; this is why `abort-recursive-edit', which
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156 throws to this catch, exits out of either one.
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157
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158 initial_command_loop(), called from main(), sets up a catch
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159 for 'top-level when invoking command_loop_2(), allowing functions
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160 to throw all the way to the top level if they really need to.
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161 Before invoking command_loop_2(), initial_command_loop() calls
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162 top_level_1(), which handles all of the startup stuff (creating
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163 the initial frame, handling the command-line options, loading
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164 the user's .emacs file, etc.). The function that actually does this
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165 is in Lisp and is pointed to by the variable `top-level';
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166 normally this function is `normal-top-level'. top_level_1() is
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167 just an error-handling wrapper similar to command_loop_2().
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168 Note also that initial_command_loop() sets up a catch for 'top-level
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169 when invoking top_level_1(), just like when it invokes
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170 command_loop_2(). */
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171
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172
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173 static Lisp_Object
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174 cmd_error (Lisp_Object data, Lisp_Object dummy)
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175 {
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176 /* This function can GC */
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177 check_quit (); /* make Vquit_flag accurate */
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178 Vquit_flag = Qnil;
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179
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180 any_console_state ();
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181
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182 if (!NILP (Ffboundp (Qcommand_error)))
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183 return call1 (Qcommand_error, data);
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184
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185 return default_error_handler (data);
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186 }
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187
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188 static Lisp_Object
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189 top_level_1 (Lisp_Object dummy)
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190 {
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191 /* This function can GC */
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192 /* On entry to the outer level, run the startup file */
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193 if (!NILP (Vtop_level))
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194 condition_case_1 (Qerror, Feval, Vtop_level, cmd_error, Qnil);
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195 #if 1
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196 else
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197 {
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198 message ("\ntemacs can only be run in -batch mode.");
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199 noninteractive = 1; /* prevent things under kill-emacs from blowing up */
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200 Fkill_emacs (make_int (-1));
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201 }
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202 #else
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203 else if (purify_flag)
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204 message ("Bare impure Emacs (standard Lisp code not loaded)");
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205 else
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206 message ("Bare Emacs (standard Lisp code not loaded)");
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207 #endif
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208
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209 return Qnil;
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210 }
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211
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212 /* Here we catch errors in execution of commands within the
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213 editing loop, and reenter the editing loop.
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214 When there is an error, cmd_error runs and the call
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215 to condition_case_1() returns. */
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216
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217 /* Avoid confusing the compiler. A helper function for command_loop_2 */
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218 static DOESNT_RETURN
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219 command_loop_3 (void)
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220 {
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221 /* This function can GC */
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222 for (;;)
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223 {
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224 condition_case_1 (Qerror, command_loop_1, Qnil, cmd_error, Qnil);
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225 /* #### wrong with selected-console? */
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226 /* See command in initial_command_loop about why this value
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227 is 0. */
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228 reset_this_command_keys (Vselected_console, 0);
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229 }
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230 }
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231
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232 static Lisp_Object
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233 command_loop_2 (Lisp_Object dummy)
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234 {
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235 command_loop_3(); /* doesn't return */
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236 return Qnil;
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237 }
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238
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239 /* This is called from emacs.c when it's done with initialization. */
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240
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241 DOESNT_RETURN
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242 initial_command_loop (Lisp_Object load_me)
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243 {
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244 /* This function can GC */
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245 if (!NILP (load_me))
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246 Vtop_level = list2 (Qload, load_me);
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247
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248 /* First deal with startup and command-line arguments. A throw
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249 to 'top-level gets us back here directly (does this ever happen?).
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250 Otherwise, this function will return normally when all command-
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251 line arguments have been processed, the user's initialization
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252 file has been read in, and the first frame has been created. */
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253 internal_catch (Qtop_level, top_level_1, Qnil, 0);
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254
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255 /* If an error occurred during startup and the initial console
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256 wasn't created, then die now (the error was already printed out
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257 on the terminal device). */
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258 if (!noninteractive &&
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259 (!CONSOLEP (Vselected_console) ||
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260 CONSOLE_STREAM_P (XCONSOLE (Vselected_console))))
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261 Fkill_emacs (make_int (-1));
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262
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263 /* End of -batch run causes exit here. */
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264 if (noninteractive)
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265 Fkill_emacs (Qt);
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266
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267 for (;;)
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268 {
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269 command_loop_level = 0;
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270 MARK_MODELINE_CHANGED;
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271 /* Now invoke the command loop. It never returns; however, a
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272 throw to 'top-level will place us at the end of this loop. */
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273 internal_catch (Qtop_level, command_loop_2, Qnil, 0);
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274 /* #### wrong with selected-console? */
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275 /* We don't actually call clear_echo_area() here, partially
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276 at least because that runs Lisp code and it may be unsafe
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277 to do so -- we are outside of the normal catches for
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278 errors and such. */
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279 reset_this_command_keys (Vselected_console, 0);
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280 }
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281 }
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282
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283 /* This function is invoked when a macro or minibuffer starts up.
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284 Normal termination of the macro or minibuffer causes a throw past us.
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285 See the comment above.
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286
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287 Note that this function never returns (but may be thrown out of). */
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288
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289 Lisp_Object
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290 call_command_loop (Lisp_Object catch_errors)
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291 {
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292 /* This function can GC */
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293 if (NILP (catch_errors))
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294 return (command_loop_1 (Qnil));
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295 else
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296 return (command_loop_2 (Qnil));
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297 }
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298
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299 static Lisp_Object
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300 recursive_edit_unwind (Lisp_Object buffer)
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301 {
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302 if (!NILP (buffer))
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303 Fset_buffer (buffer);
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304
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305 command_loop_level--;
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306 MARK_MODELINE_CHANGED;
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307
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308 return Qnil;
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309 }
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310
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311 DEFUN ("recursive-edit", Frecursive_edit, Srecursive_edit, 0, 0, "" /*
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312 Invoke the editor command loop recursively.
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313 To get out of the recursive edit, a command can do `(throw 'exit nil)';
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314 that tells this function to return.
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315 Alternately, `(throw 'exit t)' makes this function signal an error.
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316 */ )
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317 ()
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318 {
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319 /* This function can GC */
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320 Lisp_Object val;
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321 int speccount = specpdl_depth ();
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322
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323 command_loop_level++;
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324 MARK_MODELINE_CHANGED;
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325
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326 record_unwind_protect (recursive_edit_unwind,
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327 ((current_buffer
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328 != XBUFFER (XWINDOW (Fselected_window
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329 (Qnil))->buffer))
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330 ? Fcurrent_buffer ()
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331 : Qnil));
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332
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333 specbind (Qstandard_output, Qt);
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334 specbind (Qstandard_input, Qt);
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335
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336 val = internal_catch (Qexit, command_loop_2, Qnil, 0);
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337
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338 if (EQ (val, Qt))
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339 /* Turn abort-recursive-edit into a quit. */
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340 Fsignal (Qquit, Qnil);
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341
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342 return unbind_to (speccount, Qnil);
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343 }
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344
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345 #endif /* !LISP_COMMAND_LOOP */
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346
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347
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348 /**********************************************************************/
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349 /* Alternate command-loop (largely in Lisp) */
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350 /**********************************************************************/
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351
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352 #ifdef LISP_COMMAND_LOOP
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353
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354 static Lisp_Object
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355 load1 (Lisp_Object name)
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356 {
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357 /* This function can GC */
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358 call4 (Qload, name, Qnil, Qt, Qnil);
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359 return (Qnil);
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360 }
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361
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362 /* emergency backups for cold-load-stream use */
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363 static Lisp_Object
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364 cold_load_command_error (Lisp_Object datum, Lisp_Object ignored)
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365 {
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366 /* This function can GC */
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367 check_quit (); /* make Vquit_flag accurate */
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368 Vquit_flag = Qnil;
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369
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370 return default_error_handler (datum);
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371 }
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372
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373 static Lisp_Object
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374 cold_load_command_loop (Lisp_Object dummy)
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375 {
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376 /* This function can GC */
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377 return (condition_case_1 (Qt,
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378 command_loop_1, Qnil,
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379 cold_load_command_error, Qnil));
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380 }
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381
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382 Lisp_Object
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383 call_command_loop (Lisp_Object catch_errors)
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384 {
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385 /* This function can GC */
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386 reset_this_command_keys (Vselected_console, Qnil); /* #### bleagh */
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387
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388 loop:
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389 for (;;)
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390 {
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391 if (NILP (Vcommand_loop))
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392 break;
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393 call1 (Vcommand_loop, catch_errors);
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394 }
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395
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396 /* This isn't a "correct" definition, but you're pretty hosed if
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397 you broke "command-loop" anyway */
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398 /* #### not correct with Vselected_console */
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399 XCONSOLE (Vselected_console)->prefix_arg = Qnil;
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400 if (NILP (catch_errors))
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401 Fcommand_loop_1 ();
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402 else
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403 internal_catch (Qtop_level,
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404 cold_load_command_loop, Qnil, 0);
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405 goto loop;
|
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406 return Qnil;
|
|
|
407 }
|
|
|
408
|
|
|
409 static Lisp_Object
|
|
|
410 initial_error_handler (Lisp_Object datum, Lisp_Object ignored)
|
|
|
411 {
|
|
|
412 /* This function can GC */
|
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413 Vcommand_loop = Qnil;
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|
|
414 Fding (Qnil, Qnil, Qnil);
|
|
|
415
|
|
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416 if (CONSP (datum) && EQ (XCAR (datum), Qquit))
|
|
|
417 /* Don't bother with the message */
|
|
|
418 return (Qt);
|
|
|
419
|
|
|
420 message ("Error in command-loop!!");
|
|
|
421 Fset (intern ("last-error"), datum); /* #### Better/different name? */
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|
|
422 Fsit_for (make_int (2), Qnil);
|
|
|
423 cold_load_command_error (datum, Qnil);
|
|
|
424 return (Qt);
|
|
|
425 }
|
|
|
426
|
|
|
427 DOESNT_RETURN
|
|
|
428 initial_command_loop (Lisp_Object load_me)
|
|
|
429 {
|
|
|
430 /* This function can GC */
|
|
|
431 if (!NILP (load_me))
|
|
|
432 {
|
|
|
433 if (!NILP (condition_case_1 (Qt, load1, load_me,
|
|
|
434 initial_error_handler, Qnil)))
|
|
|
435 Fkill_emacs (make_int (-1));
|
|
|
436 }
|
|
|
437
|
|
|
438 for (;;)
|
|
|
439 {
|
|
|
440 command_loop_level = 0;
|
|
|
441 MARK_MODELINE_CHANGED;
|
|
|
442
|
|
|
443 condition_case_1 (Qt,
|
|
|
444 call_command_loop, Qtop_level,
|
|
|
445 initial_error_handler, Qnil);
|
|
|
446 }
|
|
|
447 }
|
|
|
448
|
|
|
449 #endif /* LISP_COMMAND_LOOP */
|
|
|
450
|
|
|
451
|
|
|
452 /**********************************************************************/
|
|
|
453 /* Guts of command loop */
|
|
|
454 /**********************************************************************/
|
|
|
455
|
|
|
456 static Lisp_Object
|
|
|
457 command_loop_1 (Lisp_Object dummy)
|
|
|
458 {
|
|
|
459 /* This function can GC */
|
|
|
460 /* #### not correct with Vselected_console */
|
|
|
461 XCONSOLE (Vselected_console)->prefix_arg = Qnil;
|
|
|
462 return (Fcommand_loop_1 ());
|
|
|
463 }
|
|
|
464
|
|
|
465 /* This is the actual command reading loop, sans error-handling
|
|
|
466 encapsulation. This is used for both the C and Lisp command
|
|
|
467 loops. Originally this function was written in Lisp when
|
|
|
468 the Lisp command loop was used, but it was too slow that way.
|
|
|
469
|
|
|
470 Under the C command loop, this function will never return
|
|
|
471 (although someone might throw past it). Under the Lisp
|
|
|
472 command loop, this will return only when the user specifies
|
|
|
473 a new command loop by changing the command-loop variable. */
|
|
|
474
|
|
|
475 DEFUN ("command-loop-1", Fcommand_loop_1, Scommand_loop_1, 0, 0, 0 /*
|
|
|
476 Invoke the internals of the canonical editor command loop.
|
|
|
477 Don't call this unless you know what you're doing.
|
|
|
478 */ )
|
|
|
479 ()
|
|
|
480 {
|
|
|
481 /* This function can GC */
|
|
|
482 Lisp_Object event = Fmake_event ();
|
|
|
483 Lisp_Object old_loop = Qnil;
|
|
|
484 struct gcpro gcpro1, gcpro2;
|
|
|
485 int was_locked = in_single_console_state ();
|
|
|
486 GCPRO2 (event, old_loop);
|
|
|
487
|
|
|
488 /* cancel_echoing (); */
|
|
|
489 /* This magically makes single character keyboard macros work just
|
|
|
490 like the real thing. This is slightly bogus, but it's in here for
|
|
|
491 compatibility with Emacs 18. It's not even clear what the "right
|
|
|
492 thing" is. */
|
|
|
493 if (!(((STRINGP (Vexecuting_macro) || VECTORP (Vexecuting_macro))
|
|
|
494 && XINT (Flength (Vexecuting_macro)) == 1)))
|
|
|
495 Vlast_command = Qt;
|
|
|
496
|
|
|
497 #ifndef LISP_COMMAND_LOOP
|
|
|
498 while (1)
|
|
|
499 #else
|
|
|
500 old_loop = Vcommand_loop;
|
|
|
501 while (EQ (Vcommand_loop, old_loop))
|
|
|
502 #endif /* LISP_COMMAND_LOOP */
|
|
|
503 {
|
|
|
504 /* Make sure the current window's buffer is selected. */
|
|
|
505 {
|
|
|
506 Lisp_Object selected_window = Fselected_window (Qnil);
|
|
|
507
|
|
|
508 if (!NILP (selected_window) &&
|
|
|
509 (XBUFFER (XWINDOW (selected_window)->buffer) != current_buffer))
|
|
|
510 {
|
|
|
511 set_buffer_internal (XBUFFER (XWINDOW (selected_window)->buffer));
|
|
|
512 }
|
|
|
513 }
|
|
|
514
|
|
|
515 /* If ^G was typed before we got here (that is, before emacs was
|
|
|
516 idle and waiting for input) then we treat that as an interrupt. */
|
|
|
517 QUIT;
|
|
|
518
|
|
|
519 /* If minibuffer on and echo area in use, wait 2 sec and redraw
|
|
|
520 minibuffer. Treat a ^G here as a command, not an interrupt.
|
|
|
521 */
|
|
|
522 if (minibuf_level > 0 && echo_area_active (selected_frame ()))
|
|
|
523 {
|
|
|
524 /* Bind dont_check_for_quit to 1 so that C-g gets read in
|
|
|
525 rather than quitting back to the minibuffer. */
|
|
|
526 int count = specpdl_depth ();
|
|
|
527 begin_dont_check_for_quit ();
|
|
|
528 Fsit_for (make_int (2), Qnil);
|
|
|
529 clear_echo_area (selected_frame (), Qnil, 0);
|
|
|
530 unbind_to (count, Qnil);
|
|
|
531 }
|
|
|
532
|
|
|
533 Fnext_event (event, Qnil);
|
|
|
534 /* If ^G was typed while emacs was reading input from the user, then
|
|
|
535 Fnext_event() will have read it as a normal event and
|
|
|
536 next_event_internal() will have set Vquit_flag. We reset this
|
|
|
537 so that the ^G is treated as just another key. This is strange,
|
|
|
538 but it is what emacs 18 did.
|
|
|
539
|
|
|
540 Do not call check_quit() here. */
|
|
|
541 Vquit_flag = Qnil;
|
|
|
542 Fdispatch_event (event);
|
|
|
543
|
|
|
544 if (!was_locked)
|
|
|
545 any_console_state ();
|
|
|
546 #if defined (__SUNPRO_C) || (defined (DEC_ALPHA) && defined (OSF1))
|
|
|
547 if (0) return Qnil; /* Shut up compiler */
|
|
|
548 #endif
|
|
|
549 }
|
|
|
550 #ifdef LISP_COMMAND_LOOP
|
|
|
551 UNGCPRO;
|
|
|
552 return Qnil;
|
|
|
553 #endif
|
|
|
554 }
|
|
|
555
|
|
|
556
|
|
|
557 /**********************************************************************/
|
|
|
558 /* Initialization */
|
|
|
559 /**********************************************************************/
|
|
|
560
|
|
|
561 void
|
|
|
562 syms_of_cmdloop (void)
|
|
|
563 {
|
|
|
564 defsymbol (&Qcommand_error, "command-error");
|
|
|
565 defsymbol (&Qreally_early_error_handler, "really-early-error-handler");
|
|
|
566 defsymbol (&Qtop_level, "top-level");
|
|
|
567
|
|
|
568 #ifndef LISP_COMMAND_LOOP
|
|
|
569 defsubr (&Srecursive_edit);
|
|
|
570 #endif
|
|
|
571 defsubr (&Sreally_early_error_handler);
|
|
|
572 defsubr (&Scommand_loop_1);
|
|
|
573 }
|
|
|
574
|
|
|
575 void
|
|
|
576 vars_of_cmdloop (void)
|
|
|
577 {
|
|
|
578 DEFVAR_INT ("command-loop-level", &command_loop_level /*
|
|
|
579 Number of recursive edits in progress.
|
|
|
580 */ );
|
|
|
581 command_loop_level = 0;
|
|
|
582
|
|
|
583 DEFVAR_LISP ("disabled-command-hook", &Vdisabled_command_hook /*
|
|
|
584 Value is called instead of any command that is disabled,
|
|
|
585 i.e. has a non-nil `disabled' property.
|
|
|
586 */ );
|
|
|
587 Vdisabled_command_hook = intern ("disabled-command-hook");
|
|
|
588
|
|
|
589 DEFVAR_LISP ("leave-window-hook", &Vleave_window_hook /*
|
|
|
590 Not yet implemented.
|
|
|
591 */ );
|
|
|
592 Vleave_window_hook = Qnil;
|
|
|
593
|
|
|
594 DEFVAR_LISP ("enter-window-hook", &Venter_window_hook /*
|
|
|
595 Not yet implemented.
|
|
|
596 */ );
|
|
|
597 Venter_window_hook = Qnil;
|
|
|
598
|
|
|
599 #ifndef LISP_COMMAND_LOOP
|
|
|
600 DEFVAR_LISP ("top-level", &Vtop_level /*
|
|
|
601 Form to evaluate when Emacs starts up.
|
|
|
602 Useful to set before you dump a modified Emacs.
|
|
|
603 */ );
|
|
|
604 Vtop_level = Qnil;
|
|
|
605 #else
|
|
|
606 DEFVAR_LISP ("command-loop", &Vcommand_loop /*
|
|
|
607 Function or one argument to call to read and process keyboard commands.
|
|
|
608 The passed argument specifies whether or not to handle errors.
|
|
|
609 */ );
|
|
|
610 Vcommand_loop = Qnil;
|
|
|
611 #endif /* LISP_COMMAND_LOOP */
|
|
|
612 }
|
