[bpt/guile.git] / guile-readline / readline.c

/* readline.c --- line editing support for Guile */

/* Copyright (C) 1997,1999,2000,2001, 2002, 2003, 2006 Free Software Foundation, Inc.
 * 
 * This program 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 2, or (at your option)
 * any later version.
 * 
 * This program 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 this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA
 *
 */


\f

#if HAVE_CONFIG_H
#  include <config.h>
#endif

#include "libguile/_scm.h"
#ifdef HAVE_RL_GETC_FUNCTION
#include "libguile.h"
#include "libguile/gh.h"
#include "libguile/iselect.h"

#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <readline/readline.h>
#include <readline/history.h>
#ifndef __MINGW32__
#include <sys/time.h>
#else
#include <io.h>
#endif
#include <signal.h>

#include "libguile/validate.h"
#include "guile-readline/readline.h"

scm_t_option scm_readline_opts[] = {
  { SCM_OPTION_BOOLEAN, "history-file", 1,
    "Use history file." },
  { SCM_OPTION_INTEGER, "history-length", 200,
    "History length." },
  { SCM_OPTION_INTEGER, "bounce-parens", 500,
    "Time (ms) to show matching opening parenthesis (0 = off)."}
};

extern void stifle_history (int max);

SCM_DEFINE (scm_readline_options, "readline-options-interface", 0, 1, 0, 
            (SCM setting),
"")
#define FUNC_NAME s_scm_readline_options
{
  SCM ans = scm_options (setting,
			 scm_readline_opts,
			 SCM_N_READLINE_OPTIONS,
			 FUNC_NAME);
  stifle_history (SCM_HISTORY_LENGTH);
  return ans;
}
#undef FUNC_NAME

#ifndef HAVE_STRDUP
static char *
strdup (char *s)
{
  size_t len = strlen (s);
  char *new = malloc (len + 1);
  strcpy (new, s);
  return new;
}
#endif /* HAVE_STRDUP */

#ifndef HAVE_RL_CLEANUP_AFTER_SIGNAL

/* These are readline functions added in release 2.3.  They will work
 * together with readline-2.1 and 2.2.  (The readline interface is
 * disabled for earlier releases.)
 * They are declared static; if we want to use them elsewhere, then
 * we need external declarations for them, but at the moment, I don't
 * think anything else in Guile ought to use these.
 */

extern void _rl_clean_up_for_exit ();
extern void _rl_kill_kbd_macro ();
extern int _rl_init_argument ();

void
rl_cleanup_after_signal ()
{
#ifdef HAVE_RL_CLEAR_SIGNALS
  _rl_clean_up_for_exit ();
#endif
  (*rl_deprep_term_function) ();
#ifdef HAVE_RL_CLEAR_SIGNALS
  rl_clear_signals ();
#endif
  rl_pending_input = 0;
}

void
rl_free_line_state ()
{
  register HIST_ENTRY *entry;
   
  free_undo_list ();

  entry = current_history ();
  if (entry)
    entry->data = (char *)NULL; 
  
  _rl_kill_kbd_macro ();
  rl_clear_message ();
  _rl_init_argument ();
}

#endif /* !HAVE_RL_CLEANUP_AFTER_SIGNAL */

static int promptp;
static SCM input_port;
static SCM before_read;

static int
current_input_getc (FILE *in SCM_UNUSED)
{
  if (promptp && scm_is_true (before_read))
    {
      scm_apply (before_read, SCM_EOL, SCM_EOL);
      promptp = 0;
    }
  return scm_getc (input_port);
}

static int in_readline = 0;
static SCM reentry_barrier_mutex;

static SCM internal_readline (SCM text);
static SCM handle_error (void *data, SCM tag, SCM args);
static void reentry_barrier (void);


SCM_DEFINE (scm_readline, "%readline", 0, 4, 0, 
            (SCM text, SCM inp, SCM outp, SCM read_hook),
"")
#define FUNC_NAME s_scm_readline
{
  SCM ans;
  
  reentry_barrier ();
  
  before_read = SCM_BOOL_F;

  if (!SCM_UNBNDP (text))
    {
      if (!scm_is_string (text))
	{
	  --in_readline;
	  scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	}
    }
  
  if (!((SCM_UNBNDP (inp) && SCM_OPINFPORTP (scm_current_input_port ()))
	|| SCM_OPINFPORTP (inp)))
    {
      --in_readline;
      scm_misc_error (s_scm_readline,
		      "Input port is not open or not a file port",
		      SCM_EOL);
    }
  
  if (!((SCM_UNBNDP (outp) && SCM_OPOUTFPORTP (scm_current_output_port ()))
	|| SCM_OPOUTFPORTP (outp)))
    {
      --in_readline;
      scm_misc_error (s_scm_readline,
		      "Output port is not open or not a file port",
		      SCM_EOL);
    }

  if (!(SCM_UNBNDP (read_hook) || scm_is_false (read_hook)))
    {
      if (scm_is_false (scm_thunk_p (read_hook)))
	{
	  --in_readline;
	  scm_wrong_type_arg (s_scm_readline, SCM_ARG4, read_hook);
	}
      before_read = read_hook;
    }

  scm_readline_init_ports (inp, outp);

  ans = scm_internal_catch (SCM_BOOL_T,
			    (scm_t_catch_body) internal_readline,
			    (void *) SCM_UNPACK (text),
			    handle_error, 0);

#ifndef __MINGW32__
  fclose (rl_instream);
  fclose (rl_outstream);
#endif

  --in_readline;
  return ans;
}
#undef FUNC_NAME


static void
reentry_barrier ()
{
  int reentryp = 0;
  /* We should rather use scm_try_mutex when it becomes available */
  scm_lock_mutex (reentry_barrier_mutex);
  if (in_readline)
    reentryp = 1;
  else
    ++in_readline;
  scm_unlock_mutex (reentry_barrier_mutex);
  if (reentryp)
    scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL);
}

static SCM
handle_error (void *data, SCM tag, SCM args)
{
  rl_free_line_state ();
  rl_cleanup_after_signal ();
  fputc ('\n', rl_outstream); /* We don't want next output on this line */
#ifndef __MINGW32__
  fclose (rl_instream);
  fclose (rl_outstream);
#endif
  --in_readline;
  scm_handle_by_throw (data, tag, args);
  return SCM_UNSPECIFIED; /* never reached */
}

static SCM
internal_readline (SCM text)
{
  SCM ret;
  char *s;
  char *prompt = SCM_UNBNDP (text) ? "" : scm_to_locale_string (text);

  promptp = 1;
  s = readline (prompt);
  if (s)
    ret = scm_from_locale_string (s);
  else 
    ret = SCM_EOF_VAL;

  if (!SCM_UNBNDP (text))
    free (prompt);
  free (s);

  return ret;
}

static FILE *
stream_from_fport (SCM port, char *mode, const char *subr)
{
  int fd;
  FILE *f;

  fd = dup (((struct scm_t_fport *) SCM_STREAM (port))->fdes);
  if (fd == -1)
    {
      --in_readline;
      scm_syserror (subr);
    }

  f = fdopen (fd, mode);
  if (f == NULL)
    {
      --in_readline;
      scm_syserror (subr);
    }

  return f;
}

void
scm_readline_init_ports (SCM inp, SCM outp)
{
  if (SCM_UNBNDP (inp))
    inp = scm_current_input_port ();
  
  if (SCM_UNBNDP (outp))
    outp = scm_current_output_port ();
  
  if (!SCM_OPINFPORTP (inp)) {
    scm_misc_error (0,
                    "Input port is not open or not a file port",
                    SCM_EOL);
  }

  if (!SCM_OPOUTFPORTP (outp)) {
    scm_misc_error (0,
                    "Output port is not open or not a file port",
                    SCM_EOL);
  }

  input_port = inp;
#ifndef __MINGW32__
  rl_instream = stream_from_fport (inp, "r", s_scm_readline);
  rl_outstream = stream_from_fport (outp, "w", s_scm_readline);
#endif
}


SCM_DEFINE (scm_add_history, "add-history", 1, 0, 0, 
            (SCM text),
"")
#define FUNC_NAME s_scm_add_history
{
  char* s;

  s = scm_to_locale_string (text);
  add_history (s);

  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME


SCM_DEFINE (scm_read_history, "read-history", 1, 0, 0, 
            (SCM file),
"")
#define FUNC_NAME s_scm_read_history
{
  char *filename;
  SCM ret;

  filename = scm_to_locale_string (file);
  ret = scm_from_bool (!read_history (filename));
  free (filename);
  return ret;
}
#undef FUNC_NAME


SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0, 
            (SCM file),
"")
#define FUNC_NAME s_scm_write_history
{
  char *filename;
  SCM ret;

  filename = scm_to_locale_string (file);
  ret = scm_from_bool (!write_history (filename));
  free (filename);
  return ret;
}
#undef FUNC_NAME

SCM_DEFINE (scm_clear_history, "clear-history", 0, 0, 0, 
            (),
	    "Clear the history buffer of the readline machinery.")
#define FUNC_NAME s_scm_clear_history
{
  clear_history();
  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME


SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0, 
            (SCM text, SCM continuep),
"")
#define FUNC_NAME s_scm_filename_completion_function
{
  char *s;
  SCM ans;
  char *c_text = scm_to_locale_string (text);
#ifdef HAVE_RL_FILENAME_COMPLETION_FUNCTION
  s = rl_filename_completion_function (c_text, scm_is_true (continuep));
#else
  s = filename_completion_function (c_text, scm_is_true (continuep));
#endif
  ans = scm_take_locale_string (s);
  free (c_text);
  return ans;
}
#undef FUNC_NAME

/*
 * The following has been modified from code contributed by
 * Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>
 */

SCM scm_readline_completion_function_var;

static char *
completion_function (char *text, int continuep)
{
  SCM compfunc = SCM_VARIABLE_REF (scm_readline_completion_function_var);
  SCM res;

  if (scm_is_false (compfunc))
    return NULL; /* #f => completion disabled */
  else
    {
      SCM t = scm_from_locale_string (text);
      SCM c = scm_from_bool (continuep);
      res = scm_apply (compfunc, scm_list_2 (t, c), SCM_EOL);
  
      if (scm_is_false (res))
	return NULL;
  
      return scm_to_locale_string (res);
    }
}

/*Bouncing parenthesis (reimplemented by GH, 11/23/98, since readline is strict gpl)*/

static int match_paren (int x, int k);
static int find_matching_paren (int k);
static void init_bouncing_parens ();

static void
init_bouncing_parens ()
{
  if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
    {
      rl_bind_key (')', match_paren);
      rl_bind_key (']', match_paren);
      rl_bind_key ('}', match_paren);
    }
}

static int
find_matching_paren(int k)
{
  register int i;
  register char c = 0;
  int end_parens_found = 0;

  /* Choose the corresponding opening bracket.  */
  if (k == ')') c = '(';
  else if (k == ']') c = '[';
  else if (k == '}') c = '{';

  for (i=rl_point-2; i>=0; i--)
    {
      /* Is the current character part of a character literal?  */
      if (i - 2 >= 0
	  && rl_line_buffer[i - 1] == '\\'
	  && rl_line_buffer[i - 2] == '#')
	;
      else if (rl_line_buffer[i] == k)
	end_parens_found++;
      else if (rl_line_buffer[i] == '"')
	{
	  /* Skip over a string literal.  */
	  for (i--; i >= 0; i--)
	    if (rl_line_buffer[i] == '"'
		&& ! (i - 1 >= 0
		      && rl_line_buffer[i - 1] == '\\'))
	      break;
	}
      else if (rl_line_buffer[i] == c)
	{
	  if (end_parens_found==0)
	    return i;
	  else --end_parens_found;
	}
    }
  return -1;
}

static int
match_paren (int x, int k)
{
  int tmp;
#ifndef __MINGW32__
  int fno;
  SELECT_TYPE readset;
  struct timeval timeout;
#endif

  rl_insert (x, k);
  if (!SCM_READLINE_BOUNCE_PARENS)
    return 0;

  /* Did we just insert a quoted paren?  If so, then don't bounce.  */
  if (rl_point - 1 >= 1
      && rl_line_buffer[rl_point - 2] == '\\')
    return 0;

#ifndef __MINGW32__
  tmp = 1000 * SCM_READLINE_BOUNCE_PARENS;
  timeout.tv_sec = tmp / 1000000;
  timeout.tv_usec = tmp % 1000000;
  FD_ZERO (&readset);
  fno = fileno (rl_instream);
  FD_SET (fno, &readset);
#endif

  if (rl_point > 1)
    {
      tmp = rl_point;
      rl_point = find_matching_paren (k);
      if (rl_point > -1)
	{
	  rl_redisplay ();
#ifndef __MINGW32__
	  scm_std_select (fno + 1, &readset, NULL, NULL, &timeout);
#else
	  WaitForSingleObject (GetStdHandle(STD_INPUT_HANDLE),
			       SCM_READLINE_BOUNCE_PARENS); 
#endif
	}
      rl_point = tmp;
    }
  return 0;
}

#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
/* Readline disables SA_RESTART on SIGWINCH.
 * This code turns it back on.
 */
static int
sigwinch_enable_restart (void)
{
#ifdef HAVE_SIGINTERRUPT
  siginterrupt (SIGWINCH, 0);
#else
  struct sigaction action;
  
  sigaction (SIGWINCH, NULL, &action);
  action.sa_flags |= SA_RESTART;
  sigaction (SIGWINCH, &action, NULL);
#endif
  return 0;
}
#endif

#endif /* HAVE_RL_GETC_FUNCTION */

void
scm_init_readline ()
{
#ifdef HAVE_RL_GETC_FUNCTION
#include "guile-readline/readline.x"
  scm_readline_completion_function_var
    = scm_c_define ("*readline-completion-function*", SCM_BOOL_F);
#ifndef __MINGW32__
  rl_getc_function = current_input_getc;
#endif
#if defined (_RL_FUNCTION_TYPEDEF)
  rl_completion_entry_function = (rl_compentry_func_t*) completion_function;
#else  
  rl_completion_entry_function = (Function*) completion_function;
#endif
  rl_basic_word_break_characters = "\t\n\"'`;()";
  rl_readline_name = "Guile";
#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
  rl_pre_input_hook = sigwinch_enable_restart;
#endif

  reentry_barrier_mutex = scm_permanent_object (scm_make_mutex ());
  scm_init_opts (scm_readline_options,
		 scm_readline_opts,
		 SCM_N_READLINE_OPTIONS);
  init_bouncing_parens();
  scm_add_feature ("readline");
#endif /* HAVE_RL_GETC_FUNCTION */
}

/*
  Local Variables:
  c-file-style: "gnu"
  End:
*/
Commit	Line	Data
c374ab69 MV	1	/* readline.c --- line editing support for Guile */
c374ab69 MV	2
1b09b607	3	/* Copyright (C) 1997,1999,2000,2001, 2002, 2003, 2006 Free Software Foundation, Inc.
c374ab69 MV	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License as published by
	7	* the Free Software Foundation; either version 2, or (at your option)
	8	* any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this software; see the file COPYING. If not, write to
92205699 MV	17	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
92205699 MV	18	* Boston, MA 02110-1301 USA
c374ab69 MV	19	*
c374ab69 MV	20	*/
f48e47b9	21
f48e47b9	22
c374ab69 MV	23	\f
c374ab69 MV	24
26aff4f9 RB	25	#if HAVE_CONFIG_H
	26	# include <config.h>
	27	#endif
	28
739b3bf1	29	#include "libguile/_scm.h"
62947883	30	#ifdef HAVE_RL_GETC_FUNCTION
fbf68f8b	31	#include "libguile.h"
739b3bf1 MD	32	#include "libguile/gh.h"
	33	#include "libguile/iselect.h"
	34
ffdeebc3	35	#include <stdio.h>
48552b1d MD	36	#ifdef HAVE_UNISTD_H
	37	#include <unistd.h>
	38	#endif
c374ab69 MV	39	#include <readline/readline.h>
c374ab69 MV	40	#include <readline/history.h>
5e90b6ac	41	#ifndef __MINGW32__
c374ab69	42	#include <sys/time.h>
5e90b6ac MV	43	#else
	44	#include <io.h>
	45	#endif
b71099ba	46	#include <signal.h>
c374ab69	47
1c537018	48	#include "libguile/validate.h"
a0599745	49	#include "guile-readline/readline.h"
c374ab69	50
593be5d2	51	scm_t_option scm_readline_opts[] = {
c374ab69 MV	52	{ SCM_OPTION_BOOLEAN, "history-file", 1,
	53	"Use history file." },
	54	{ SCM_OPTION_INTEGER, "history-length", 200,
	55	"History length." },
	56	{ SCM_OPTION_INTEGER, "bounce-parens", 500,
	57	"Time (ms) to show matching opening parenthesis (0 = off)."}
	58	};
	59
	60	extern void stifle_history (int max);
	61
b916d813	62	SCM_DEFINE (scm_readline_options, "readline-options-interface", 0, 1, 0,
f48e47b9 GB	63	(SCM setting),
	64	"")
	65	#define FUNC_NAME s_scm_readline_options
c374ab69 MV	66	{
	67	SCM ans = scm_options (setting,
	68	scm_readline_opts,
	69	SCM_N_READLINE_OPTIONS,
f48e47b9	70	FUNC_NAME);
c374ab69 MV	71	stifle_history (SCM_HISTORY_LENGTH);
	72	return ans;
	73	}
f48e47b9	74	#undef FUNC_NAME
c374ab69 MV	75
	76	#ifndef HAVE_STRDUP
	77	static char *
	78	strdup (char *s)
	79	{
1be6b49c	80	size_t len = strlen (s);
c374ab69 MV	81	char *new = malloc (len + 1);
	82	strcpy (new, s);
	83	return new;
	84	}
	85	#endif /* HAVE_STRDUP */
	86
	87	#ifndef HAVE_RL_CLEANUP_AFTER_SIGNAL
	88
	89	/* These are readline functions added in release 2.3. They will work
	90	* together with readline-2.1 and 2.2. (The readline interface is
	91	* disabled for earlier releases.)
	92	* They are declared static; if we want to use them elsewhere, then
	93	* we need external declarations for them, but at the moment, I don't
	94	* think anything else in Guile ought to use these.
	95	*/
	96
	97	extern void _rl_clean_up_for_exit ();
	98	extern void _rl_kill_kbd_macro ();
	99	extern int _rl_init_argument ();
	100
2e3d5987	101	void
c374ab69 MV	102	rl_cleanup_after_signal ()
	103	{
	104	#ifdef HAVE_RL_CLEAR_SIGNALS
	105	_rl_clean_up_for_exit ();
	106	#endif
	107	(*rl_deprep_term_function) ();
	108	#ifdef HAVE_RL_CLEAR_SIGNALS
	109	rl_clear_signals ();
	110	#endif
	111	rl_pending_input = 0;
	112	}
	113
2e3d5987	114	void
c374ab69 MV	115	rl_free_line_state ()
	116	{
	117	register HIST_ENTRY *entry;
	118
	119	free_undo_list ();
	120
	121	entry = current_history ();
	122	if (entry)
	123	entry->data = (char *)NULL;
	124
	125	_rl_kill_kbd_macro ();
	126	rl_clear_message ();
	127	_rl_init_argument ();
	128	}
	129
	130	#endif /* !HAVE_RL_CLEANUP_AFTER_SIGNAL */
	131
	132	static int promptp;
	133	static SCM input_port;
	134	static SCM before_read;
	135
	136	static int
e81d98ec	137	current_input_getc (FILE *in SCM_UNUSED)
c374ab69	138	{
be49d1df	139	if (promptp && scm_is_true (before_read))
c374ab69 MV	140	{
	141	scm_apply (before_read, SCM_EOL, SCM_EOL);
	142	promptp = 0;
	143	}
bc858b80	144	return scm_getc (input_port);
c374ab69 MV	145	}
c374ab69 MV	146
c374ab69	147	static int in_readline = 0;
bb0f37e7	148	static SCM reentry_barrier_mutex;
c374ab69	149
f48e47b9 GB	150	static SCM internal_readline (SCM text);
f48e47b9 GB	151	static SCM handle_error (void *data, SCM tag, SCM args);
48552b1d	152	static void reentry_barrier (void);
f48e47b9 GB	153
f48e47b9 GB	154
b916d813	155	SCM_DEFINE (scm_readline, "%readline", 0, 4, 0,
f48e47b9 GB	156	(SCM text, SCM inp, SCM outp, SCM read_hook),
	157	"")
	158	#define FUNC_NAME s_scm_readline
	159	{
	160	SCM ans;
	161
	162	reentry_barrier ();
	163
	164	before_read = SCM_BOOL_F;
	165
	166	if (!SCM_UNBNDP (text))
	167	{
ad6dec05	168	if (!scm_is_string (text))
f48e47b9 GB	169	{
	170	--in_readline;
	171	scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	172	}
f48e47b9 GB	173	}
f48e47b9 GB	174
0ddf47fc	175	if (!((SCM_UNBNDP (inp) && SCM_OPINFPORTP (scm_current_input_port ()))
379b35da	176	\|\| SCM_OPINFPORTP (inp)))
f48e47b9 GB	177	{
	178	--in_readline;
	179	scm_misc_error (s_scm_readline,
	180	"Input port is not open or not a file port",
	181	SCM_EOL);
	182	}
	183
0ddf47fc	184	if (!((SCM_UNBNDP (outp) && SCM_OPOUTFPORTP (scm_current_output_port ()))
379b35da	185	\|\| SCM_OPOUTFPORTP (outp)))
f48e47b9 GB	186	{
	187	--in_readline;
	188	scm_misc_error (s_scm_readline,
	189	"Output port is not open or not a file port",
	190	SCM_EOL);
	191	}
	192
be49d1df	193	if (!(SCM_UNBNDP (read_hook) \|\| scm_is_false (read_hook)))
f48e47b9	194	{
be49d1df	195	if (scm_is_false (scm_thunk_p (read_hook)))
f48e47b9 GB	196	{
	197	--in_readline;
	198	scm_wrong_type_arg (s_scm_readline, SCM_ARG4, read_hook);
	199	}
	200	before_read = read_hook;
	201	}
	202
	203	scm_readline_init_ports (inp, outp);
	204
	205	ans = scm_internal_catch (SCM_BOOL_T,
593be5d2	206	(scm_t_catch_body) internal_readline,
f60d011a	207	(void *) SCM_UNPACK (text),
f48e47b9 GB	208	handle_error, 0);
f48e47b9 GB	209
8f99e3f3	210	#ifndef __MINGW32__
f48e47b9 GB	211	fclose (rl_instream);
f48e47b9 GB	212	fclose (rl_outstream);
8f99e3f3	213	#endif
f48e47b9 GB	214
	215	--in_readline;
	216	return ans;
	217	}
	218	#undef FUNC_NAME
	219
	220
c374ab69 MV	221	static void
	222	reentry_barrier ()
	223	{
	224	int reentryp = 0;
246c563b	225	/* We should rather use scm_try_mutex when it becomes available */
bb0f37e7	226	scm_lock_mutex (reentry_barrier_mutex);
c374ab69 MV	227	if (in_readline)
	228	reentryp = 1;
	229	else
	230	++in_readline;
bb0f37e7	231	scm_unlock_mutex (reentry_barrier_mutex);
c374ab69	232	if (reentryp)
f48e47b9	233	scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL);
c374ab69 MV	234	}
	235
	236	static SCM
	237	handle_error (void *data, SCM tag, SCM args)
	238	{
	239	rl_free_line_state ();
	240	rl_cleanup_after_signal ();
739b3bf1	241	fputc ('\n', rl_outstream); /* We don't want next output on this line */
8f99e3f3	242	#ifndef __MINGW32__
c374ab69 MV	243	fclose (rl_instream);
c374ab69 MV	244	fclose (rl_outstream);
8f99e3f3	245	#endif
c374ab69 MV	246	--in_readline;
	247	scm_handle_by_throw (data, tag, args);
	248	return SCM_UNSPECIFIED; /* never reached */
	249	}
	250
	251	static SCM
	252	internal_readline (SCM text)
	253	{
	254	SCM ret;
	255	char *s;
ad6dec05	256	char *prompt = SCM_UNBNDP (text) ? "" : scm_to_locale_string (text);
c374ab69 MV	257
	258	promptp = 1;
	259	s = readline (prompt);
	260	if (s)
ad6dec05	261	ret = scm_from_locale_string (s);
c374ab69 MV	262	else
	263	ret = SCM_EOF_VAL;
	264
ad6dec05 MV	265	if (!SCM_UNBNDP (text))
ad6dec05 MV	266	free (prompt);
c374ab69 MV	267	free (s);
	268
	269	return ret;
	270	}
	271
	272	static FILE *
	273	stream_from_fport (SCM port, char mode, const char subr)
	274	{
	275	int fd;
	276	FILE *f;
	277
593be5d2	278	fd = dup (((struct scm_t_fport *) SCM_STREAM (port))->fdes);
c374ab69 MV	279	if (fd == -1)
	280	{
	281	--in_readline;
	282	scm_syserror (subr);
	283	}
	284
	285	f = fdopen (fd, mode);
	286	if (f == NULL)
	287	{
	288	--in_readline;
	289	scm_syserror (subr);
	290	}
	291
	292	return f;
	293	}
	294
2e3d5987 MD	295	void
	296	scm_readline_init_ports (SCM inp, SCM outp)
	297	{
	298	if (SCM_UNBNDP (inp))
0ddf47fc	299	inp = scm_current_input_port ();
2e3d5987 MD	300
2e3d5987 MD	301	if (SCM_UNBNDP (outp))
0ddf47fc	302	outp = scm_current_output_port ();
2e3d5987	303
379b35da	304	if (!SCM_OPINFPORTP (inp)) {
2e3d5987 MD	305	scm_misc_error (0,
	306	"Input port is not open or not a file port",
	307	SCM_EOL);
	308	}
	309
379b35da	310	if (!SCM_OPOUTFPORTP (outp)) {
2e3d5987 MD	311	scm_misc_error (0,
	312	"Output port is not open or not a file port",
	313	SCM_EOL);
	314	}
	315
	316	input_port = inp;
8f99e3f3	317	#ifndef __MINGW32__
f48e47b9 GB	318	rl_instream = stream_from_fport (inp, "r", s_scm_readline);
f48e47b9 GB	319	rl_outstream = stream_from_fport (outp, "w", s_scm_readline);
8f99e3f3	320	#endif
2e3d5987 MD	321	}
2e3d5987 MD	322
c374ab69	323
c374ab69	324
b916d813	325	SCM_DEFINE (scm_add_history, "add-history", 1, 0, 0,
f48e47b9 GB	326	(SCM text),
	327	"")
	328	#define FUNC_NAME s_scm_add_history
c374ab69 MV	329	{
c374ab69 MV	330	char* s;
c374ab69	331
ad6dec05 MV	332	s = scm_to_locale_string (text);
ad6dec05 MV	333	add_history (s);
c374ab69 MV	334
	335	return SCM_UNSPECIFIED;
	336	}
f48e47b9	337	#undef FUNC_NAME
c374ab69 MV	338
c374ab69 MV	339
b916d813	340	SCM_DEFINE (scm_read_history, "read-history", 1, 0, 0,
f48e47b9 GB	341	(SCM file),
	342	"")
	343	#define FUNC_NAME s_scm_read_history
c374ab69	344	{
ad6dec05 MV	345	char *filename;
	346	SCM ret;
	347
	348	filename = scm_to_locale_string (file);
	349	ret = scm_from_bool (!read_history (filename));
	350	free (filename);
	351	return ret;
c374ab69	352	}
f48e47b9	353	#undef FUNC_NAME
c374ab69 MV	354
c374ab69 MV	355
b916d813	356	SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0,
f48e47b9 GB	357	(SCM file),
	358	"")
	359	#define FUNC_NAME s_scm_write_history
c374ab69	360	{
ad6dec05 MV	361	char *filename;
	362	SCM ret;
	363
	364	filename = scm_to_locale_string (file);
	365	ret = scm_from_bool (!write_history (filename));
	366	free (filename);
	367	return ret;
c374ab69	368	}
f48e47b9	369	#undef FUNC_NAME
c374ab69	370
8ed35a15 MV	371	SCM_DEFINE (scm_clear_history, "clear-history", 0, 0, 0,
	372	(),
	373	"Clear the history buffer of the readline machinery.")
	374	#define FUNC_NAME s_scm_clear_history
	375	{
	376	clear_history();
	377	return SCM_UNSPECIFIED;
	378	}
	379	#undef FUNC_NAME
	380
c374ab69	381
b916d813	382	SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0,
f48e47b9 GB	383	(SCM text, SCM continuep),
	384	"")
	385	#define FUNC_NAME s_scm_filename_completion_function
c374ab69 MV	386	{
	387	char *s;
	388	SCM ans;
ad6dec05	389	char *c_text = scm_to_locale_string (text);
dcb17187	390	#ifdef HAVE_RL_FILENAME_COMPLETION_FUNCTION
ad6dec05	391	s = rl_filename_completion_function (c_text, scm_is_true (continuep));
dcb17187	392	#else
ad6dec05	393	s = filename_completion_function (c_text, scm_is_true (continuep));
dcb17187	394	#endif
ad6dec05 MV	395	ans = scm_take_locale_string (s);
ad6dec05 MV	396	free (c_text);
c374ab69 MV	397	return ans;
c374ab69 MV	398	}
f48e47b9	399	#undef FUNC_NAME
c374ab69 MV	400
	401	/*
	402	* The following has been modified from code contributed by
	403	* Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>
	404	*/
	405
	406	SCM scm_readline_completion_function_var;
	407
	408	static char *
	409	completion_function (char *text, int continuep)
	410	{
296ff5e7	411	SCM compfunc = SCM_VARIABLE_REF (scm_readline_completion_function_var);
c374ab69 MV	412	SCM res;
c374ab69 MV	413
be49d1df	414	if (scm_is_false (compfunc))
c374ab69 MV	415	return NULL; /* #f => completion disabled */
	416	else
	417	{
ad6dec05	418	SCM t = scm_from_locale_string (text);
be49d1df	419	SCM c = scm_from_bool (continuep);
5b2a7b59	420	res = scm_apply (compfunc, scm_list_2 (t, c), SCM_EOL);
c374ab69	421
be49d1df	422	if (scm_is_false (res))
c374ab69 MV	423	return NULL;
c374ab69 MV	424
ad6dec05	425	return scm_to_locale_string (res);
c374ab69 MV	426	}
	427	}
	428
	429	/Bouncing parenthesis (reimplemented by GH, 11/23/98, since readline is strict gpl)/
	430
576cdec4 MD	431	static int match_paren (int x, int k);
	432	static int find_matching_paren (int k);
	433	static void init_bouncing_parens ();
c374ab69 MV	434
c374ab69 MV	435	static void
576cdec4	436	init_bouncing_parens ()
c374ab69	437	{
576cdec4 MD	438	if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
	439	{
	440	rl_bind_key (')', match_paren);
	441	rl_bind_key (']', match_paren);
	442	rl_bind_key ('}', match_paren);
	443	}
c374ab69 MV	444	}
	445
	446	static int
	447	find_matching_paren(int k)
	448	{
	449	register int i;
	450	register char c = 0;
	451	int end_parens_found = 0;
	452
	453	/* Choose the corresponding opening bracket. */
	454	if (k == ')') c = '(';
	455	else if (k == ']') c = '[';
	456	else if (k == '}') c = '{';
	457
	458	for (i=rl_point-2; i>=0; i--)
	459	{
	460	/* Is the current character part of a character literal? */
	461	if (i - 2 >= 0
	462	&& rl_line_buffer[i - 1] == '\\'
	463	&& rl_line_buffer[i - 2] == '#')
	464	;
	465	else if (rl_line_buffer[i] == k)
	466	end_parens_found++;
	467	else if (rl_line_buffer[i] == '"')
	468	{
	469	/* Skip over a string literal. */
	470	for (i--; i >= 0; i--)
	471	if (rl_line_buffer[i] == '"'
	472	&& ! (i - 1 >= 0
	473	&& rl_line_buffer[i - 1] == '\\'))
	474	break;
	475	}
	476	else if (rl_line_buffer[i] == c)
	477	{
576cdec4 MD	478	if (end_parens_found==0)
576cdec4 MD	479	return i;
c374ab69 MV	480	else --end_parens_found;
	481	}
	482	}
	483	return -1;
	484	}
	485
576cdec4 MD	486	static int
576cdec4 MD	487	match_paren (int x, int k)
c374ab69	488	{
8f99e3f3 SJ	489	int tmp;
	490	#ifndef __MINGW32__
	491	int fno;
aba2031a	492	SELECT_TYPE readset;
c374ab69	493	struct timeval timeout;
8f99e3f3 SJ	494	#endif
8f99e3f3 SJ	495
576cdec4	496	rl_insert (x, k);
c374ab69	497	if (!SCM_READLINE_BOUNCE_PARENS)
576cdec4	498	return 0;
c374ab69 MV	499
	500	/* Did we just insert a quoted paren? If so, then don't bounce. */
	501	if (rl_point - 1 >= 1
	502	&& rl_line_buffer[rl_point - 2] == '\\')
576cdec4	503	return 0;
c374ab69	504
8f99e3f3	505	#ifndef __MINGW32__
c374ab69 MV	506	tmp = 1000 * SCM_READLINE_BOUNCE_PARENS;
	507	timeout.tv_sec = tmp / 1000000;
	508	timeout.tv_usec = tmp % 1000000;
576cdec4	509	FD_ZERO (&readset);
bc858b80 MD	510	fno = fileno (rl_instream);
bc858b80 MD	511	FD_SET (fno, &readset);
8f99e3f3 SJ	512	#endif
8f99e3f3 SJ	513
576cdec4 MD	514	if (rl_point > 1)
	515	{
	516	tmp = rl_point;
	517	rl_point = find_matching_paren (k);
	518	if (rl_point > -1)
	519	{
	520	rl_redisplay ();
8f99e3f3	521	#ifndef __MINGW32__
0ddf47fc	522	scm_std_select (fno + 1, &readset, NULL, NULL, &timeout);
8f99e3f3 SJ	523	#else
	524	WaitForSingleObject (GetStdHandle(STD_INPUT_HANDLE),
	525	SCM_READLINE_BOUNCE_PARENS);
	526	#endif
576cdec4 MD	527	}
576cdec4 MD	528	rl_point = tmp;
c374ab69	529	}
576cdec4	530	return 0;
c374ab69 MV	531	}
c374ab69 MV	532
b71099ba MD	533	#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
	534	/* Readline disables SA_RESTART on SIGWINCH.
	535	* This code turns it back on.
	536	*/
	537	static int
	538	sigwinch_enable_restart (void)
	539	{
	540	#ifdef HAVE_SIGINTERRUPT
	541	siginterrupt (SIGWINCH, 0);
	542	#else
	543	struct sigaction action;
	544
	545	sigaction (SIGWINCH, NULL, &action);
	546	action.sa_flags \|= SA_RESTART;
	547	sigaction (SIGWINCH, &action, NULL);
	548	#endif
	549	return 0;
	550	}
	551	#endif
	552
26047451 MD	553	#endif /* HAVE_RL_GETC_FUNCTION */
26047451 MD	554
c374ab69 MV	555	void
	556	scm_init_readline ()
	557	{
62947883	558	#ifdef HAVE_RL_GETC_FUNCTION
a0599745	559	#include "guile-readline/readline.x"
c374ab69	560	scm_readline_completion_function_var
296ff5e7	561	= scm_c_define ("readline-completion-function", SCM_BOOL_F);
8f99e3f3	562	#ifndef __MINGW32__
c374ab69	563	rl_getc_function = current_input_getc;
8f99e3f3	564	#endif
dcb17187 MV	565	#if defined (_RL_FUNCTION_TYPEDEF)
	566	rl_completion_entry_function = (rl_compentry_func_t*) completion_function;
	567	#else
c374ab69	568	rl_completion_entry_function = (Function*) completion_function;
dcb17187	569	#endif
c374ab69	570	rl_basic_word_break_characters = "\t\n\"'`;()";
5c11cc9d	571	rl_readline_name = "Guile";
b71099ba MD	572	#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
	573	rl_pre_input_hook = sigwinch_enable_restart;
	574	#endif
5c11cc9d	575
bb0f37e7	576	reentry_barrier_mutex = scm_permanent_object (scm_make_mutex ());
c374ab69 MV	577	scm_init_opts (scm_readline_options,
	578	scm_readline_opts,
	579	SCM_N_READLINE_OPTIONS);
	580	init_bouncing_parens();
	581	scm_add_feature ("readline");
62947883	582	#endif /* HAVE_RL_GETC_FUNCTION */
c374ab69 MV	583	}
c374ab69 MV	584
89e00824 ML	585	/*
	586	Local Variables:
	587	c-file-style: "gnu"
	588	End:
	589	*/