lib/readline/macro.c

   1 /* macro.c -- keyboard macros for readline. */
   2
   3 /* Copyright (C) 1994-2009,2017 Free Software Foundation, Inc.
   4
   5    This file is part of the GNU Readline Library (Readline), a library
   6    for reading lines of text with interactive input and history editing.
   7
   8    Readline is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    Readline is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with Readline.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #define READLINE_LIBRARY
  23
  24 #if defined (HAVE_CONFIG_H)
  25 #  include <config.h>
  26 #endif
  27
  28 #include <sys/types.h>
  29
  30 #if defined (HAVE_UNISTD_H)
  31 #  include <unistd.h>           /* for _POSIX_VERSION */
  32 #endif /* HAVE_UNISTD_H */
  33
  34 #if defined (HAVE_STDLIB_H)
  35 #  include <stdlib.h>
  36 #else
  37 #  include "ansi_stdlib.h"
  38 #endif /* HAVE_STDLIB_H */
  39
  40 #include <stdio.h>
  41
  42 /* System-specific feature definitions and include files. */
  43 #include "rldefs.h"
  44
  45 /* Some standard library routines. */
  46 #include "readline.h"
  47 #include "history.h"
  48
  49 #include "rlprivate.h"
  50 #include "xmalloc.h"
  51
  52 #define MAX_MACRO_LEVEL 16
  53
  54 /* **************************************************************** */
  55 /*                                                                  */
  56 /*                      Hacking Keyboard Macros                     */
  57 /*                                                                  */
  58 /* **************************************************************** */
  59
  60 /* The currently executing macro string.  If this is non-zero,
  61    then it is a malloc ()'ed string where input is coming from. */
  62 char *rl_executing_macro = (char *)NULL;
  63
  64 /* The offset in the above string to the next character to be read. */
  65 static int executing_macro_index;
  66
  67 /* The current macro string being built.  Characters get stuffed
  68    in here by add_macro_char (). */
  69 static char *current_macro = (char *)NULL;
  70
  71 /* The size of the buffer allocated to current_macro. */
  72 static int current_macro_size;
  73
  74 /* The index at which characters are being added to current_macro. */
  75 static int current_macro_index;
  76
  77 /* A structure used to save nested macro strings.
  78    It is a linked list of string/index for each saved macro. */
  79 struct saved_macro {
  80   struct saved_macro *next;
  81   char *string;
  82   int sindex;
  83 };
  84
  85 /* The list of saved macros. */
  86 static struct saved_macro *macro_list = (struct saved_macro *)NULL;
  87
  88 static int macro_level = 0;
  89
  90 /* Set up to read subsequent input from STRING.
  91    STRING is free ()'ed when we are done with it. */
  92 void
  93 _rl_with_macro_input (char *string)
  94 {
  95   if (macro_level > MAX_MACRO_LEVEL)
  96     {
  97       _rl_errmsg ("maximum macro execution nesting level exceeded");
  98       _rl_abort_internal ();
  99       return;
 100     }
 101
 102 #if 0
 103   if (rl_executing_macro)               /* XXX - later */
 104 #endif
 105     _rl_push_executing_macro ();
 106   rl_executing_macro = string;
 107   executing_macro_index = 0;
 108   RL_SETSTATE(RL_STATE_MACROINPUT);
 109 }
 110
 111 /* Return the next character available from a macro, or 0 if
 112    there are no macro characters. */
 113 int
 114 _rl_next_macro_key (void)
 115 {
 116   int c;
 117
 118   if (rl_executing_macro == 0)
 119     return (0);
 120
 121   if (rl_executing_macro[executing_macro_index] == 0)
 122     {
 123       _rl_pop_executing_macro ();
 124       return (_rl_next_macro_key ());
 125     }
 126
 127 #if defined (READLINE_CALLBACKS)
 128   c = rl_executing_macro[executing_macro_index++];
 129   if (RL_ISSTATE (RL_STATE_CALLBACK) && RL_ISSTATE (RL_STATE_READCMD|RL_STATE_MOREINPUT) && rl_executing_macro[executing_macro_index] == 0)
 130       _rl_pop_executing_macro ();
 131   return c;
 132 #else
 133   /* XXX - consider doing the same as the callback code, just not testing
 134      whether we're running in callback mode */
 135   return (rl_executing_macro[executing_macro_index++]);
 136 #endif
 137 }
 138
 139 int
 140 _rl_peek_macro_key (void)
 141 {
 142   if (rl_executing_macro == 0)
 143     return (0);
 144   if (rl_executing_macro[executing_macro_index] == 0 && (macro_list == 0 || macro_list->string == 0))
 145     return (0);
 146   if (rl_executing_macro[executing_macro_index] == 0 && macro_list && macro_list->string)
 147     return (macro_list->string[0]);
 148   return (rl_executing_macro[executing_macro_index]);
 149 }
 150
 151 int
 152 _rl_prev_macro_key (void)
 153 {
 154   if (rl_executing_macro == 0)
 155     return (0);
 156
 157   if (executing_macro_index == 0)
 158     return (0);
 159
 160   executing_macro_index--;
 161   return (rl_executing_macro[executing_macro_index]);
 162 }
 163
 164 /* Save the currently executing macro on a stack of saved macros. */
 165 void
 166 _rl_push_executing_macro (void)
 167 {
 168   struct saved_macro *saver;
 169
 170   saver = (struct saved_macro *)xmalloc (sizeof (struct saved_macro));
 171   saver->next = macro_list;
 172   saver->sindex = executing_macro_index;
 173   saver->string = rl_executing_macro;
 174
 175   macro_list = saver;
 176
 177   macro_level++;
 178 }
 179
 180 /* Discard the current macro, replacing it with the one
 181    on the top of the stack of saved macros. */
 182 void
 183 _rl_pop_executing_macro (void)
 184 {
 185   struct saved_macro *macro;
 186
 187   FREE (rl_executing_macro);
 188   rl_executing_macro = (char *)NULL;
 189   executing_macro_index = 0;
 190
 191   if (macro_list)
 192     {
 193       macro = macro_list;
 194       rl_executing_macro = macro_list->string;
 195       executing_macro_index = macro_list->sindex;
 196       macro_list = macro_list->next;
 197       xfree (macro);
 198     }
 199
 200   macro_level--;
 201
 202   if (rl_executing_macro == 0)
 203     RL_UNSETSTATE(RL_STATE_MACROINPUT);
 204 }
 205
 206 /* Add a character to the macro being built. */
 207 void
 208 _rl_add_macro_char (int c)
 209 {
 210   if (current_macro_index + 1 >= current_macro_size)
 211     {
 212       if (current_macro == 0)
 213         current_macro = (char *)xmalloc (current_macro_size = 25);
 214       else
 215         current_macro = (char *)xrealloc (current_macro, current_macro_size += 25);
 216     }
 217
 218   current_macro[current_macro_index++] = c;
 219   current_macro[current_macro_index] = '\0';
 220 }
 221
 222 void
 223 _rl_kill_kbd_macro (void)
 224 {
 225   if (current_macro)
 226     {
 227       xfree (current_macro);
 228       current_macro = (char *) NULL;
 229     }
 230   current_macro_size = current_macro_index = 0;
 231
 232   FREE (rl_executing_macro);
 233   rl_executing_macro = (char *) NULL;
 234   executing_macro_index = 0;
 235
 236   RL_UNSETSTATE(RL_STATE_MACRODEF);
 237 }
 238
 239 /* Begin defining a keyboard macro.
 240    Keystrokes are recorded as they are executed.
 241    End the definition with rl_end_kbd_macro ().
 242    If a numeric argument was explicitly typed, then append this
 243    definition to the end of the existing macro, and start by
 244    re-executing the existing macro. */
 245 int
 246 rl_start_kbd_macro (int ignore1, int ignore2)
 247 {
 248   if (RL_ISSTATE (RL_STATE_MACRODEF))
 249     {
 250       _rl_abort_internal ();
 251       return 1;
 252     }
 253
 254   if (rl_explicit_arg)
 255     {
 256       if (current_macro)
 257         _rl_with_macro_input (savestring (current_macro));
 258     }
 259   else
 260     current_macro_index = 0;
 261
 262   RL_SETSTATE(RL_STATE_MACRODEF);
 263   return 0;
 264 }
 265
 266 /* Stop defining a keyboard macro.
 267    A numeric argument says to execute the macro right now,
 268    that many times, counting the definition as the first time. */
 269 int
 270 rl_end_kbd_macro (int count, int ignore)
 271 {
 272   if (RL_ISSTATE (RL_STATE_MACRODEF) == 0)
 273     {
 274       _rl_abort_internal ();
 275       return 1;
 276     }
 277
 278   current_macro_index -= rl_key_sequence_length;
 279   current_macro[current_macro_index] = '\0';
 280
 281   RL_UNSETSTATE(RL_STATE_MACRODEF);
 282
 283   return (rl_call_last_kbd_macro (--count, 0));
 284 }
 285
 286 /* Execute the most recently defined keyboard macro.
 287    COUNT says how many times to execute it. */
 288 int
 289 rl_call_last_kbd_macro (int count, int ignore)
 290 {
 291   if (current_macro == 0)
 292     _rl_abort_internal ();
 293
 294   if (RL_ISSTATE (RL_STATE_MACRODEF))
 295     {
 296       rl_ding ();               /* no recursive macros */
 297       current_macro[--current_macro_index] = '\0';      /* erase this char */
 298       return 0;
 299     }
 300
 301   while (count--)
 302     _rl_with_macro_input (savestring (current_macro));
 303   return 0;
 304 }
 305
 306 int
 307 rl_print_last_kbd_macro (int count, int ignore)
 308 {
 309   char *m;
 310
 311   if (current_macro == 0)
 312     {
 313       rl_ding ();
 314       return 0;
 315     }
 316   m = _rl_untranslate_macro_value (current_macro, 1);
 317   rl_crlf ();
 318   printf ("%s", m);
 319   fflush (stdout);
 320   rl_crlf ();
 321   FREE (m);
 322   rl_forced_update_display ();
 323   rl_display_fixed = 1;
 324
 325   return 0;
 326 }
 327
 328 void
 329 rl_push_macro_input (char *macro)
 330 {
 331   _rl_with_macro_input (macro);
 332 }