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428
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1 /* Simple built-in editing commands.
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2 Copyright (C) 1985, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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3
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4 This file is part of XEmacs.
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5
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6 XEmacs is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by the
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8 Free Software Foundation; either version 2, or (at your option) any
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9 later version.
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10
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11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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14 for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with XEmacs; see the file COPYING. If not, write to
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18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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19 Boston, MA 02111-1307, USA. */
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20
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21 /* Synched up with: Mule 2.0, FSF 19.30. */
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22
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23 #include <config.h>
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24 #include "lisp.h"
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25 #include "commands.h"
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26 #include "buffer.h"
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27 #include "syntax.h"
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28 #include "insdel.h"
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29
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30 Lisp_Object Qkill_forward_chars;
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31 Lisp_Object Qself_insert_command;
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32 Lisp_Object Qno_self_insert;
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33
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34 Lisp_Object Vblink_paren_function;
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35
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36 /* A possible value for a buffer's overwrite-mode variable. */
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37 Lisp_Object Qoverwrite_mode_binary;
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38
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39 /* Non-nil means put this face on the next self-inserting character. */
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40 Lisp_Object Vself_insert_face;
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41
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42 /* This is the command that set up Vself_insert_face. */
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43 Lisp_Object Vself_insert_face_command;
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44
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45 DEFUN ("forward-char", Fforward_char, 0, 2, "_p", /*
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46 Move point right N characters (left if N negative).
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47 On attempt to pass end of buffer, stop and signal `end-of-buffer'.
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48 On attempt to pass beginning of buffer, stop and signal `beginning-of-buffer'.
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49 On reaching end of buffer, stop and signal error.
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50 */
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51 (n, buffer))
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52 {
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53 struct buffer *buf = decode_buffer (buffer, 1);
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54 EMACS_INT count;
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55
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56 if (NILP (n))
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57 count = 1;
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58 else
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59 {
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60 CHECK_INT (n);
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61 count = XINT (n);
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62 }
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63
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64 /* This used to just set point to point + XINT (n), and then check
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65 to see if it was within boundaries. But now that SET_PT can
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66 potentially do a lot of stuff (calling entering and exiting
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67 hooks, etcetera), that's not a good approach. So we validate the
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68 proposed position, then set point. */
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69 {
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70 Bufpos new_point = BUF_PT (buf) + count;
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71
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72 if (new_point < BUF_BEGV (buf))
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73 {
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74 BUF_SET_PT (buf, BUF_BEGV (buf));
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75 Fsignal (Qbeginning_of_buffer, Qnil);
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76 return Qnil;
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77 }
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78 if (new_point > BUF_ZV (buf))
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79 {
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80 BUF_SET_PT (buf, BUF_ZV (buf));
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81 Fsignal (Qend_of_buffer, Qnil);
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82 return Qnil;
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83 }
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84
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85 BUF_SET_PT (buf, new_point);
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86 }
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87
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88 return Qnil;
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89 }
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90
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91 DEFUN ("backward-char", Fbackward_char, 0, 2, "_p", /*
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92 Move point left N characters (right if N negative).
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93 On attempt to pass end of buffer, stop and signal `end-of-buffer'.
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94 On attempt to pass beginning of buffer, stop and signal `beginning-of-buffer'.
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95 */
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96 (n, buffer))
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97 {
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98 if (NILP (n))
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99 n = make_int (-1);
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100 else
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101 {
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102 CHECK_INT (n);
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103 XSETINT (n, - XINT (n));
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104 }
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105 return Fforward_char (n, buffer);
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106 }
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107
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108 DEFUN ("forward-line", Fforward_line, 0, 2, "_p", /*
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109 Move N lines forward (backward if N is negative).
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110 Precisely, if point is on line I, move to the start of line I + N.
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111 If there isn't room, go as far as possible (no error).
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112 Returns the count of lines left to move. If moving forward,
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113 that is N - number of lines moved; if backward, N + number moved.
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114 With positive N, a non-empty line at the end counts as one line
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115 successfully moved (for the return value).
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116 If BUFFER is nil, the current buffer is assumed.
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117 */
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118 (n, buffer))
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119 {
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120 struct buffer *buf = decode_buffer (buffer, 1);
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121 Bufpos pos2 = BUF_PT (buf);
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122 Bufpos pos;
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123 EMACS_INT count, shortage, negp;
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124
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125 if (NILP (n))
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126 count = 1;
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127 else
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128 {
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129 CHECK_INT (n);
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130 count = XINT (n);
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131 }
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132
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133 negp = count <= 0;
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134 pos = scan_buffer (buf, '\n', pos2, 0, count - negp, &shortage, 1);
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135 if (shortage > 0
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136 && (negp
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137 || (BUF_ZV (buf) > BUF_BEGV (buf)
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138 && pos != pos2
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139 && BUF_FETCH_CHAR (buf, pos - 1) != '\n')))
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140 shortage--;
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141 BUF_SET_PT (buf, pos);
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142 return make_int (negp ? - shortage : shortage);
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143 }
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144
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145 DEFUN ("point-at-bol", Fpoint_at_bol, 0, 2, 0, /*
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146 Return the character position of the first character on the current line.
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147 With argument N not nil or 1, move forward N - 1 lines first.
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148 If scan reaches end of buffer, return that position.
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149 This function does not move point.
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150 */
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151 (n, buffer))
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152 {
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153 struct buffer *b = decode_buffer (buffer, 1);
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154 REGISTER int orig, end;
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155
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156 XSETBUFFER (buffer, b);
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157 if (NILP (n))
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158 n = make_int (0);
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159 else
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160 {
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161 CHECK_INT (n);
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162 n = make_int (XINT (n) - 1);
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163 }
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164
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165 orig = BUF_PT (b);
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166 Fforward_line (n, buffer);
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167 end = BUF_PT (b);
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168 BUF_SET_PT (b, orig);
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169
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170 return make_int (end);
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171 }
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172
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173 DEFUN ("beginning-of-line", Fbeginning_of_line, 0, 2, "_p", /*
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174 Move point to beginning of current line.
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175 With argument N not nil or 1, move forward N - 1 lines first.
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176 If scan reaches end of buffer, stop there without error.
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177 If BUFFER is nil, the current buffer is assumed.
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178 */
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179 (n, buffer))
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180 {
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181 struct buffer *b = decode_buffer (buffer, 1);
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182
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183 BUF_SET_PT (b, XINT (Fpoint_at_bol (n, buffer)));
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184 return Qnil;
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185 }
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186
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187 DEFUN ("point-at-eol", Fpoint_at_eol, 0, 2, 0, /*
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188 Return the character position of the last character on the current line.
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189 With argument N not nil or 1, move forward N - 1 lines first.
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190 If scan reaches end of buffer, return that position.
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191 This function does not move point.
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192 */
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193 (n, buffer))
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194 {
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195 struct buffer *buf = decode_buffer (buffer, 1);
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196 int count;
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197
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198 if (NILP (n))
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199 count = 1;
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200 else
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201 {
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202 CHECK_INT (n);
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203 count = XINT (n);
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204 }
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205
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206 return make_int (find_before_next_newline (buf, BUF_PT (buf), 0,
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207 count - (count <= 0)));
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208 }
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209
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210 DEFUN ("end-of-line", Fend_of_line, 0, 2, "_p", /*
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211 Move point to end of current line.
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212 With argument N not nil or 1, move forward N - 1 lines first.
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213 If scan reaches end of buffer, stop there without error.
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214 If BUFFER is nil, the current buffer is assumed.
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215 */
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216 (n, buffer))
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217 {
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218 struct buffer *b = decode_buffer (buffer, 1);
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219
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220 BUF_SET_PT (b, XINT (Fpoint_at_eol (n, buffer)));
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221 return Qnil;
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222 }
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223
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224 DEFUN ("delete-char", Fdelete_char, 1, 2, "*p\nP", /*
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225 Delete the following N characters (previous, with negative N).
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226 Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).
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227 Interactively, N is the prefix arg, and KILLFLAG is set if
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228 N was explicitly specified.
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229 */
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230 (n, killflag))
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231 {
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232 /* This function can GC */
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233 Bufpos pos;
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234 struct buffer *buf = current_buffer;
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235 int count;
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236
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237 CHECK_INT (n);
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238 count = XINT (n);
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239
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240 pos = BUF_PT (buf) + count;
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241 if (NILP (killflag))
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242 {
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243 if (count < 0)
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244 {
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245 if (pos < BUF_BEGV (buf))
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246 signal_error (Qbeginning_of_buffer, Qnil);
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247 else
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248 buffer_delete_range (buf, pos, BUF_PT (buf), 0);
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249 }
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250 else
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251 {
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252 if (pos > BUF_ZV (buf))
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253 signal_error (Qend_of_buffer, Qnil);
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254 else
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255 buffer_delete_range (buf, BUF_PT (buf), pos, 0);
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256 }
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257 }
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258 else
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259 {
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260 call1 (Qkill_forward_chars, n);
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261 }
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262 return Qnil;
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263 }
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264
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265 DEFUN ("delete-backward-char", Fdelete_backward_char, 1, 2, "*p\nP", /*
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266 Delete the previous N characters (following, with negative N).
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267 Optional second arg KILLFLAG non-nil means kill instead (save in kill ring).
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268 Interactively, N is the prefix arg, and KILLFLAG is set if
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269 N was explicitly specified.
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270 */
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271 (n, killflag))
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272 {
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273 /* This function can GC */
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274 CHECK_INT (n);
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275 return Fdelete_char (make_int (- XINT (n)), killflag);
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276 }
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277
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278 static void internal_self_insert (Emchar ch, int noautofill);
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279
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280 DEFUN ("self-insert-command", Fself_insert_command, 1, 1, "*p", /*
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281 Insert the character you type.
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282 Whichever character you type to run this command is inserted.
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283 */
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284 (n))
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285 {
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286 /* This function can GC */
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287 Emchar ch;
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288 Lisp_Object c;
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289 int count;
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290
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291 CHECK_NATNUM (n);
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292 count = XINT (n);
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293
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294 if (CHAR_OR_CHAR_INTP (Vlast_command_char))
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295 c = Vlast_command_char;
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296 else
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297 c = Fevent_to_character (Vlast_command_event, Qnil, Qnil, Qt);
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298
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299 if (NILP (c))
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300 signal_simple_error ("Last typed character has no ASCII equivalent",
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301 Fcopy_event (Vlast_command_event, Qnil));
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302
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303 CHECK_CHAR_COERCE_INT (c);
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304
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305 ch = XCHAR (c);
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306
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307 while (count--)
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308 internal_self_insert (ch, (count != 0));
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309
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310 return Qnil;
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311 }
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312
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313 /* Insert character C1. If NOAUTOFILL is nonzero, don't do autofill
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314 even if it is enabled.
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315
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316 FSF:
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317
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318 If this insertion is suitable for direct output (completely simple),
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319 return 0. A value of 1 indicates this *might* not have been simple.
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320 A value of 2 means this did things that call for an undo boundary. */
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321
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322 static void
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323 internal_self_insert (Emchar c1, int noautofill)
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324 {
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325 /* This function can GC */
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326 /* int hairy = 0; -- unused */
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327 REGISTER enum syntaxcode synt;
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328 REGISTER Emchar c2;
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329 Lisp_Object overwrite;
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330 struct Lisp_Char_Table *syntax_table;
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331 struct buffer *buf = current_buffer;
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332 int tab_width;
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333
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334 overwrite = buf->overwrite_mode;
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335 syntax_table = XCHAR_TABLE (buf->mirror_syntax_table);
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336
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337 #if 0
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338 /* No, this is very bad, it makes undo *always* undo a character at a time
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339 instead of grouping consecutive self-inserts together. Nasty nasty.
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340 */
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341 if (!NILP (Vbefore_change_functions) || !NILP (Vafter_change_functions)
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342 || !NILP (Vbefore_change_function) || !NILP (Vafter_change_function))
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343 hairy = 1;
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344 #endif
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345
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346 if (!NILP (overwrite)
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347 && BUF_PT (buf) < BUF_ZV (buf)
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348 && (EQ (overwrite, Qoverwrite_mode_binary)
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349 || (c1 != '\n' && BUF_FETCH_CHAR (buf, BUF_PT (buf)) != '\n'))
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350 && (EQ (overwrite, Qoverwrite_mode_binary)
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351 || BUF_FETCH_CHAR (buf, BUF_PT (buf)) != '\t'
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352 || ((tab_width = XINT (buf->tab_width), tab_width <= 0)
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353 || tab_width > 20
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354 || !((current_column (buf) + 1) % tab_width))))
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355 {
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356 buffer_delete_range (buf, BUF_PT (buf), BUF_PT (buf) + 1, 0);
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357 /* hairy = 2; */
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358 }
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359
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360 if (!NILP (buf->abbrev_mode)
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361 && !WORD_SYNTAX_P (syntax_table, c1)
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362 && NILP (buf->read_only)
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363 && BUF_PT (buf) > BUF_BEGV (buf))
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364 {
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365 c2 = BUF_FETCH_CHAR (buf, BUF_PT (buf) - 1);
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366
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367 if (WORD_SYNTAX_P (syntax_table, c2))
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368 {
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369 #if 1
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370 Fexpand_abbrev ();
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371 #else /* FSFmacs */
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372 Lisp_Object sym = Fexpand_abbrev ();
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373
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374 /* I think this is too bogus to add. The function should
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375 have a way of examining the character to be inserted, so
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376 it can decide whether to insert it or not. We should
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377 design it better than that. */
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378
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379 /* Here FSFmacs remembers MODIFF, compares it after
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380 Fexpand_abbrev() finishes, and updates HAIRY. */
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381
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382 /* NOTE: we cannot simply check for Vlast_abbrev, because
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383 Fexpand_abbrev() can bail out before setting it to
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384 anything meaningful, leaving us stuck with an old value.
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385 Thus Fexpand_abbrev() was extended to return the actual
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386 abbrev symbol. */
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387 if (!NILP (sym)
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388 && !NILP (symbol_function (XSYMBOL (sym)))
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389 && SYMBOLP (symbol_function (XSYMBOL (sym))))
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390 {
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391 Lisp_Object prop = Fget (symbol_function (XSYMBOL (sym)),
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392 Qno_self_insert, Qnil);
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393 if (!NILP (prop))
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394 return;
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395 }
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396 #endif /* FSFmacs */
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397 }
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398 }
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399 if ((c1 == ' ' || c1 == '\n')
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400 && !noautofill
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401 && !NILP (buf->auto_fill_function))
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402 {
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403 buffer_insert_emacs_char (buf, c1);
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404 if (c1 == '\n')
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405 /* After inserting a newline, move to previous line and fill */
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406 /* that. Must have the newline in place already so filling and */
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407 /* justification, if any, know where the end is going to be. */
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408 BUF_SET_PT (buf, BUF_PT (buf) - 1);
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409 call0 (buf->auto_fill_function);
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410 if (c1 == '\n')
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411 BUF_SET_PT (buf, BUF_PT (buf) + 1);
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412 /* hairy = 2; */
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413 }
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414 else
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415 buffer_insert_emacs_char (buf, c1);
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416
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417 /* If previous command specified a face to use, use it. */
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418 if (!NILP (Vself_insert_face)
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419 && EQ (Vlast_command, Vself_insert_face_command))
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420 {
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421 Lisp_Object before = make_int (BUF_PT (buf) - 1);
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422 Lisp_Object after = make_int (BUF_PT (buf));
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423 Fput_text_property (before, after, Qface, Vself_insert_face, Qnil);
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424 Fput_text_property (before, after, Qstart_open, Qt, Qnil);
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425 Fput_text_property (before, after, Qend_open, Qnil, Qnil);
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426 /* #### FSFmacs properties are normally closed ("sticky") on the
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|
|
427 end but not the beginning. It's the opposite for us. */
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|
|
428 Vself_insert_face = Qnil;
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|
|
429 }
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|
|
430 synt = SYNTAX (syntax_table, c1);
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|
|
431 if ((synt == Sclose || synt == Smath)
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|
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432 && !NILP (Vblink_paren_function) && INTERACTIVE
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|
|
433 && !noautofill)
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|
|
434 {
|
|
|
435 call0 (Vblink_paren_function);
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|
|
436 /* hairy = 2; */
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|
|
437 }
|
|
|
438
|
|
|
439 /* return hairy; */
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|
|
440 }
|
|
|
441
|
|
|
442 /* (this comes from Mule but is a generally good idea) */
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|
|
443
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|
|
444 DEFUN ("self-insert-internal", Fself_insert_internal, 1, 1, 0, /*
|
|
|
445 Invoke `self-insert-command' as if CH is entered from keyboard.
|
|
|
446 */
|
|
|
447 (ch))
|
|
|
448 {
|
|
|
449 /* This function can GC */
|
|
|
450 CHECK_CHAR_COERCE_INT (ch);
|
|
|
451 internal_self_insert (XCHAR (ch), 0);
|
|
|
452 return Qnil;
|
|
|
453 }
|
|
|
454
|
|
|
455 /* module initialization */
|
|
|
456
|
|
|
457 void
|
|
|
458 syms_of_cmds (void)
|
|
|
459 {
|
|
|
460 defsymbol (&Qkill_forward_chars, "kill-forward-chars");
|
|
|
461 defsymbol (&Qself_insert_command, "self-insert-command");
|
|
|
462 defsymbol (&Qoverwrite_mode_binary, "overwrite-mode-binary");
|
|
|
463 defsymbol (&Qno_self_insert, "no-self-insert");
|
|
|
464
|
|
|
465 DEFSUBR (Fforward_char);
|
|
|
466 DEFSUBR (Fbackward_char);
|
|
|
467 DEFSUBR (Fforward_line);
|
|
|
468 DEFSUBR (Fbeginning_of_line);
|
|
|
469 DEFSUBR (Fend_of_line);
|
|
|
470
|
|
|
471 DEFSUBR (Fpoint_at_bol);
|
|
|
472 DEFSUBR (Fpoint_at_eol);
|
|
|
473
|
|
|
474 DEFSUBR (Fdelete_char);
|
|
|
475 DEFSUBR (Fdelete_backward_char);
|
|
|
476
|
|
|
477 DEFSUBR (Fself_insert_command);
|
|
|
478 DEFSUBR (Fself_insert_internal);
|
|
|
479 }
|
|
|
480
|
|
|
481 void
|
|
|
482 vars_of_cmds (void)
|
|
|
483 {
|
|
|
484 DEFVAR_LISP ("self-insert-face", &Vself_insert_face /*
|
|
|
485 If non-nil, set the face of the next self-inserting character to this.
|
|
|
486 See also `self-insert-face-command'.
|
|
|
487 */ );
|
|
|
488 Vself_insert_face = Qnil;
|
|
|
489
|
|
|
490 DEFVAR_LISP ("self-insert-face-command", &Vself_insert_face_command /*
|
|
|
491 This is the command that set up `self-insert-face'.
|
|
|
492 If `last-command' does not equal this value, we ignore `self-insert-face'.
|
|
|
493 */ );
|
|
|
494 Vself_insert_face_command = Qnil;
|
|
|
495
|
|
|
496 DEFVAR_LISP ("blink-paren-function", &Vblink_paren_function /*
|
|
|
497 Function called, if non-nil, whenever a close parenthesis is inserted.
|
|
|
498 More precisely, a char with closeparen syntax is self-inserted.
|
|
|
499 */ );
|
|
|
500 Vblink_paren_function = Qnil;
|
|
|
501 }
|
