readline/macro.c

/* macro.c -- keyboard macros for readline. */

/* Copyright (C) 1994-2009,2017 Free Software Foundation, Inc.

   This file is part of the GNU Readline Library (Readline), a library
   for reading lines of text with interactive input and history editing.      

   Readline is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   Readline is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with Readline.  If not, see <http://www.gnu.org/licenses/>.
*/

#define READLINE_LIBRARY

#if defined (HAVE_CONFIG_H)
#  include <config.h>
#endif

#include <sys/types.h>

#if defined (HAVE_UNISTD_H)
#  include <unistd.h>           /* for _POSIX_VERSION */
#endif /* HAVE_UNISTD_H */

#if defined (HAVE_STDLIB_H)
#  include <stdlib.h>
#else
#  include "ansi_stdlib.h"
#endif /* HAVE_STDLIB_H */

#include <stdio.h>

/* System-specific feature definitions and include files. */
#include "rldefs.h"

/* Some standard library routines. */
#include "readline.h"
#include "history.h"

#include "rlprivate.h"
#include "xmalloc.h"

#define MAX_MACRO_LEVEL 16

/* **************************************************************** */
/*								    */
/*			Hacking Keyboard Macros 		    */
/*								    */
/* **************************************************************** */

/* The currently executing macro string.  If this is non-zero,
   then it is a malloc ()'ed string where input is coming from. */
char *rl_executing_macro = (char *)NULL;

/* The offset in the above string to the next character to be read. */
static int executing_macro_index;

/* The current macro string being built.  Characters get stuffed
   in here by add_macro_char (). */
static char *current_macro = (char *)NULL;

/* The size of the buffer allocated to current_macro. */
static int current_macro_size;

/* The index at which characters are being added to current_macro. */
static int current_macro_index;

/* A structure used to save nested macro strings.
   It is a linked list of string/index for each saved macro. */
struct saved_macro {
  struct saved_macro *next;
  char *string;
  int sindex;
};

/* The list of saved macros. */
static struct saved_macro *macro_list = (struct saved_macro *)NULL;

static int macro_level = 0;

/* Set up to read subsequent input from STRING.
   STRING is free ()'ed when we are done with it. */
void
_rl_with_macro_input (char *string)
{
  if (macro_level > MAX_MACRO_LEVEL)
    {
      _rl_errmsg ("maximum macro execution nesting level exceeded");
      _rl_abort_internal ();
      return;
    }

#if 0
  if (rl_executing_macro)		/* XXX - later */
#endif
    _rl_push_executing_macro ();
  rl_executing_macro = string;
  executing_macro_index = 0;
  RL_SETSTATE(RL_STATE_MACROINPUT);
}

/* Return the next character available from a macro, or 0 if
   there are no macro characters. */
int
_rl_next_macro_key (void)
{
  int c;

  if (rl_executing_macro == 0)
    return (0);

  if (rl_executing_macro[executing_macro_index] == 0)
    {
      _rl_pop_executing_macro ();
      return (_rl_next_macro_key ());
    }

#if defined (READLINE_CALLBACKS)
  c = rl_executing_macro[executing_macro_index++];
  if (RL_ISSTATE (RL_STATE_CALLBACK) && RL_ISSTATE (RL_STATE_READCMD|RL_STATE_MOREINPUT) && rl_executing_macro[executing_macro_index] == 0)
      _rl_pop_executing_macro ();
  return c;
#else
  /* XXX - consider doing the same as the callback code, just not testing
     whether we're running in callback mode */
  return (rl_executing_macro[executing_macro_index++]);
#endif
}

int
_rl_peek_macro_key (void)
{
  if (rl_executing_macro == 0)
    return (0);
  if (rl_executing_macro[executing_macro_index] == 0 && (macro_list == 0 || macro_list->string == 0))
    return (0);
  if (rl_executing_macro[executing_macro_index] == 0 && macro_list && macro_list->string)
    return (macro_list->string[0]);
  return (rl_executing_macro[executing_macro_index]);
}

int
_rl_prev_macro_key (void)
{
  if (rl_executing_macro == 0)
    return (0);

  if (executing_macro_index == 0)
    return (0);

  executing_macro_index--;
  return (rl_executing_macro[executing_macro_index]);
}

/* Save the currently executing macro on a stack of saved macros. */
void
_rl_push_executing_macro (void)
{
  struct saved_macro *saver;

  saver = (struct saved_macro *)xmalloc (sizeof (struct saved_macro));
  saver->next = macro_list;
  saver->sindex = executing_macro_index;
  saver->string = rl_executing_macro;

  macro_list = saver;

  macro_level++;
}

/* Discard the current macro, replacing it with the one
   on the top of the stack of saved macros. */
void
_rl_pop_executing_macro (void)
{
  struct saved_macro *macro;

  FREE (rl_executing_macro);
  rl_executing_macro = (char *)NULL;
  executing_macro_index = 0;

  if (macro_list)
    {
      macro = macro_list;
      rl_executing_macro = macro_list->string;
      executing_macro_index = macro_list->sindex;
      macro_list = macro_list->next;
      xfree (macro);
    }

  macro_level--;

  if (rl_executing_macro == 0)
    RL_UNSETSTATE(RL_STATE_MACROINPUT);
}

/* Add a character to the macro being built. */
void
_rl_add_macro_char (int c)
{
  if (current_macro_index + 1 >= current_macro_size)
    {
      if (current_macro == 0)
	current_macro = (char *)xmalloc (current_macro_size = 25);
      else
	current_macro = (char *)xrealloc (current_macro, current_macro_size += 25);
    }

  current_macro[current_macro_index++] = c;
  current_macro[current_macro_index] = '\0';
}

void
_rl_kill_kbd_macro (void)
{
  if (current_macro)
    {
      xfree (current_macro);
      current_macro = (char *) NULL;
    }
  current_macro_size = current_macro_index = 0;

  FREE (rl_executing_macro);
  rl_executing_macro = (char *) NULL;
  executing_macro_index = 0;

  RL_UNSETSTATE(RL_STATE_MACRODEF);
}

/* Begin defining a keyboard macro.
   Keystrokes are recorded as they are executed.
   End the definition with rl_end_kbd_macro ().
   If a numeric argument was explicitly typed, then append this
   definition to the end of the existing macro, and start by
   re-executing the existing macro. */
int
rl_start_kbd_macro (int ignore1, int ignore2)
{
  if (RL_ISSTATE (RL_STATE_MACRODEF))
    {
      _rl_abort_internal ();
      return 1;
    }

  if (rl_explicit_arg)
    {
      if (current_macro)
	_rl_with_macro_input (savestring (current_macro));
    }
  else
    current_macro_index = 0;

  RL_SETSTATE(RL_STATE_MACRODEF);
  return 0;
}

/* Stop defining a keyboard macro.
   A numeric argument says to execute the macro right now,
   that many times, counting the definition as the first time. */
int
rl_end_kbd_macro (int count, int ignore)
{
  if (RL_ISSTATE (RL_STATE_MACRODEF) == 0)
    {
      _rl_abort_internal ();
      return 1;
    }

  current_macro_index -= rl_key_sequence_length;
  current_macro[current_macro_index] = '\0';

  RL_UNSETSTATE(RL_STATE_MACRODEF);

  return (rl_call_last_kbd_macro (--count, 0));
}

/* Execute the most recently defined keyboard macro.
   COUNT says how many times to execute it. */
int
rl_call_last_kbd_macro (int count, int ignore)
{
  if (current_macro == 0)
    _rl_abort_internal ();

  if (RL_ISSTATE (RL_STATE_MACRODEF))
    {
      rl_ding ();		/* no recursive macros */
      current_macro[--current_macro_index] = '\0';	/* erase this char */
      return 0;
    }

  while (count--)
    _rl_with_macro_input (savestring (current_macro));
  return 0;
}

int
rl_print_last_kbd_macro (int count, int ignore)
{
  char *m;

  if (current_macro == 0)
    {
      rl_ding ();
      return 0;
    }
  m = _rl_untranslate_macro_value (current_macro, 1);
  rl_crlf ();
  printf ("%s", m);
  fflush (stdout);
  rl_crlf ();
  FREE (m);
  rl_forced_update_display ();
  rl_display_fixed = 1;

  return 0;
}

void
rl_push_macro_input (char *macro)
{
  _rl_with_macro_input (macro);
}