[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

/* Include private, configure generated header (i.e. config.h). */
#include "guile-readline-config.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
5be9f729 KR	25	/* Include private, configure generated header (i.e. config.h). */
5be9f729 KR	26	#include "guile-readline-config.h"
26aff4f9	27
62947883	28	#ifdef HAVE_RL_GETC_FUNCTION
fbf68f8b	29	#include "libguile.h"
739b3bf1 MD	30	#include "libguile/gh.h"
	31	#include "libguile/iselect.h"
	32
ffdeebc3	33	#include <stdio.h>
48552b1d MD	34	#ifdef HAVE_UNISTD_H
	35	#include <unistd.h>
	36	#endif
c374ab69 MV	37	#include <readline/readline.h>
c374ab69 MV	38	#include <readline/history.h>
5e90b6ac	39	#ifndef __MINGW32__
c374ab69	40	#include <sys/time.h>
5e90b6ac MV	41	#else
	42	#include <io.h>
	43	#endif
b71099ba	44	#include <signal.h>
c374ab69	45
1c537018	46	#include "libguile/validate.h"
a0599745	47	#include "guile-readline/readline.h"
c374ab69	48
593be5d2	49	scm_t_option scm_readline_opts[] = {
c374ab69 MV	50	{ SCM_OPTION_BOOLEAN, "history-file", 1,
	51	"Use history file." },
	52	{ SCM_OPTION_INTEGER, "history-length", 200,
	53	"History length." },
	54	{ SCM_OPTION_INTEGER, "bounce-parens", 500,
	55	"Time (ms) to show matching opening parenthesis (0 = off)."}
	56	};
	57
	58	extern void stifle_history (int max);
	59
b916d813	60	SCM_DEFINE (scm_readline_options, "readline-options-interface", 0, 1, 0,
f48e47b9 GB	61	(SCM setting),
	62	"")
	63	#define FUNC_NAME s_scm_readline_options
c374ab69 MV	64	{
	65	SCM ans = scm_options (setting,
	66	scm_readline_opts,
	67	SCM_N_READLINE_OPTIONS,
f48e47b9	68	FUNC_NAME);
c374ab69 MV	69	stifle_history (SCM_HISTORY_LENGTH);
	70	return ans;
	71	}
f48e47b9	72	#undef FUNC_NAME
c374ab69 MV	73
	74	#ifndef HAVE_STRDUP
	75	static char *
	76	strdup (char *s)
	77	{
1be6b49c	78	size_t len = strlen (s);
c374ab69 MV	79	char *new = malloc (len + 1);
	80	strcpy (new, s);
	81	return new;
	82	}
	83	#endif /* HAVE_STRDUP */
	84
	85	#ifndef HAVE_RL_CLEANUP_AFTER_SIGNAL
	86
	87	/* These are readline functions added in release 2.3. They will work
	88	* together with readline-2.1 and 2.2. (The readline interface is
	89	* disabled for earlier releases.)
	90	* They are declared static; if we want to use them elsewhere, then
	91	* we need external declarations for them, but at the moment, I don't
	92	* think anything else in Guile ought to use these.
	93	*/
	94
	95	extern void _rl_clean_up_for_exit ();
	96	extern void _rl_kill_kbd_macro ();
	97	extern int _rl_init_argument ();
	98
2e3d5987	99	void
c374ab69 MV	100	rl_cleanup_after_signal ()
	101	{
	102	#ifdef HAVE_RL_CLEAR_SIGNALS
	103	_rl_clean_up_for_exit ();
	104	#endif
	105	(*rl_deprep_term_function) ();
	106	#ifdef HAVE_RL_CLEAR_SIGNALS
	107	rl_clear_signals ();
	108	#endif
	109	rl_pending_input = 0;
	110	}
	111
2e3d5987	112	void
c374ab69 MV	113	rl_free_line_state ()
	114	{
	115	register HIST_ENTRY *entry;
	116
	117	free_undo_list ();
	118
	119	entry = current_history ();
	120	if (entry)
	121	entry->data = (char *)NULL;
	122
	123	_rl_kill_kbd_macro ();
	124	rl_clear_message ();
	125	_rl_init_argument ();
	126	}
	127
	128	#endif /* !HAVE_RL_CLEANUP_AFTER_SIGNAL */
	129
	130	static int promptp;
	131	static SCM input_port;
	132	static SCM before_read;
	133
	134	static int
e81d98ec	135	current_input_getc (FILE *in SCM_UNUSED)
c374ab69	136	{
be49d1df	137	if (promptp && scm_is_true (before_read))
c374ab69 MV	138	{
	139	scm_apply (before_read, SCM_EOL, SCM_EOL);
	140	promptp = 0;
	141	}
bc858b80	142	return scm_getc (input_port);
c374ab69 MV	143	}
c374ab69 MV	144
c374ab69	145	static int in_readline = 0;
bb0f37e7	146	static SCM reentry_barrier_mutex;
c374ab69	147
f48e47b9 GB	148	static SCM internal_readline (SCM text);
f48e47b9 GB	149	static SCM handle_error (void *data, SCM tag, SCM args);
48552b1d	150	static void reentry_barrier (void);
f48e47b9 GB	151
f48e47b9 GB	152
b916d813	153	SCM_DEFINE (scm_readline, "%readline", 0, 4, 0,
f48e47b9 GB	154	(SCM text, SCM inp, SCM outp, SCM read_hook),
	155	"")
	156	#define FUNC_NAME s_scm_readline
	157	{
	158	SCM ans;
	159
	160	reentry_barrier ();
	161
	162	before_read = SCM_BOOL_F;
	163
	164	if (!SCM_UNBNDP (text))
	165	{
ad6dec05	166	if (!scm_is_string (text))
f48e47b9 GB	167	{
	168	--in_readline;
	169	scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	170	}
f48e47b9 GB	171	}
f48e47b9 GB	172
0ddf47fc	173	if (!((SCM_UNBNDP (inp) && SCM_OPINFPORTP (scm_current_input_port ()))
379b35da	174	\|\| SCM_OPINFPORTP (inp)))
f48e47b9 GB	175	{
	176	--in_readline;
	177	scm_misc_error (s_scm_readline,
	178	"Input port is not open or not a file port",
	179	SCM_EOL);
	180	}
	181
0ddf47fc	182	if (!((SCM_UNBNDP (outp) && SCM_OPOUTFPORTP (scm_current_output_port ()))
379b35da	183	\|\| SCM_OPOUTFPORTP (outp)))
f48e47b9 GB	184	{
	185	--in_readline;
	186	scm_misc_error (s_scm_readline,
	187	"Output port is not open or not a file port",
	188	SCM_EOL);
	189	}
	190
be49d1df	191	if (!(SCM_UNBNDP (read_hook) \|\| scm_is_false (read_hook)))
f48e47b9	192	{
be49d1df	193	if (scm_is_false (scm_thunk_p (read_hook)))
f48e47b9 GB	194	{
	195	--in_readline;
	196	scm_wrong_type_arg (s_scm_readline, SCM_ARG4, read_hook);
	197	}
	198	before_read = read_hook;
	199	}
	200
	201	scm_readline_init_ports (inp, outp);
	202
	203	ans = scm_internal_catch (SCM_BOOL_T,
593be5d2	204	(scm_t_catch_body) internal_readline,
f60d011a	205	(void *) SCM_UNPACK (text),
f48e47b9 GB	206	handle_error, 0);
f48e47b9 GB	207
8f99e3f3	208	#ifndef __MINGW32__
f48e47b9 GB	209	fclose (rl_instream);
f48e47b9 GB	210	fclose (rl_outstream);
8f99e3f3	211	#endif
f48e47b9 GB	212
	213	--in_readline;
	214	return ans;
	215	}
	216	#undef FUNC_NAME
	217
	218
c374ab69 MV	219	static void
	220	reentry_barrier ()
	221	{
	222	int reentryp = 0;
246c563b	223	/* We should rather use scm_try_mutex when it becomes available */
bb0f37e7	224	scm_lock_mutex (reentry_barrier_mutex);
c374ab69 MV	225	if (in_readline)
	226	reentryp = 1;
	227	else
	228	++in_readline;
bb0f37e7	229	scm_unlock_mutex (reentry_barrier_mutex);
c374ab69	230	if (reentryp)
f48e47b9	231	scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL);
c374ab69 MV	232	}
	233
	234	static SCM
	235	handle_error (void *data, SCM tag, SCM args)
	236	{
	237	rl_free_line_state ();
	238	rl_cleanup_after_signal ();
739b3bf1	239	fputc ('\n', rl_outstream); /* We don't want next output on this line */
8f99e3f3	240	#ifndef __MINGW32__
c374ab69 MV	241	fclose (rl_instream);
c374ab69 MV	242	fclose (rl_outstream);
8f99e3f3	243	#endif
c374ab69 MV	244	--in_readline;
	245	scm_handle_by_throw (data, tag, args);
	246	return SCM_UNSPECIFIED; /* never reached */
	247	}
	248
	249	static SCM
	250	internal_readline (SCM text)
	251	{
	252	SCM ret;
	253	char *s;
ad6dec05	254	char *prompt = SCM_UNBNDP (text) ? "" : scm_to_locale_string (text);
c374ab69 MV	255
	256	promptp = 1;
	257	s = readline (prompt);
	258	if (s)
ad6dec05	259	ret = scm_from_locale_string (s);
c374ab69 MV	260	else
	261	ret = SCM_EOF_VAL;
	262
ad6dec05 MV	263	if (!SCM_UNBNDP (text))
ad6dec05 MV	264	free (prompt);
c374ab69 MV	265	free (s);
	266
	267	return ret;
	268	}
	269
	270	static FILE *
	271	stream_from_fport (SCM port, char mode, const char subr)
	272	{
	273	int fd;
	274	FILE *f;
	275
593be5d2	276	fd = dup (((struct scm_t_fport *) SCM_STREAM (port))->fdes);
c374ab69 MV	277	if (fd == -1)
	278	{
	279	--in_readline;
	280	scm_syserror (subr);
	281	}
	282
	283	f = fdopen (fd, mode);
	284	if (f == NULL)
	285	{
	286	--in_readline;
	287	scm_syserror (subr);
	288	}
	289
	290	return f;
	291	}
	292
2e3d5987 MD	293	void
	294	scm_readline_init_ports (SCM inp, SCM outp)
	295	{
	296	if (SCM_UNBNDP (inp))
0ddf47fc	297	inp = scm_current_input_port ();
2e3d5987 MD	298
2e3d5987 MD	299	if (SCM_UNBNDP (outp))
0ddf47fc	300	outp = scm_current_output_port ();
2e3d5987	301
379b35da	302	if (!SCM_OPINFPORTP (inp)) {
2e3d5987 MD	303	scm_misc_error (0,
	304	"Input port is not open or not a file port",
	305	SCM_EOL);
	306	}
	307
379b35da	308	if (!SCM_OPOUTFPORTP (outp)) {
2e3d5987 MD	309	scm_misc_error (0,
	310	"Output port is not open or not a file port",
	311	SCM_EOL);
	312	}
	313
	314	input_port = inp;
8f99e3f3	315	#ifndef __MINGW32__
f48e47b9 GB	316	rl_instream = stream_from_fport (inp, "r", s_scm_readline);
f48e47b9 GB	317	rl_outstream = stream_from_fport (outp, "w", s_scm_readline);
8f99e3f3	318	#endif
2e3d5987 MD	319	}
2e3d5987 MD	320
c374ab69	321
c374ab69	322
b916d813	323	SCM_DEFINE (scm_add_history, "add-history", 1, 0, 0,
f48e47b9 GB	324	(SCM text),
	325	"")
	326	#define FUNC_NAME s_scm_add_history
c374ab69 MV	327	{
c374ab69 MV	328	char* s;
c374ab69	329
ad6dec05 MV	330	s = scm_to_locale_string (text);
ad6dec05 MV	331	add_history (s);
c374ab69 MV	332
	333	return SCM_UNSPECIFIED;
	334	}
f48e47b9	335	#undef FUNC_NAME
c374ab69 MV	336
c374ab69 MV	337
b916d813	338	SCM_DEFINE (scm_read_history, "read-history", 1, 0, 0,
f48e47b9 GB	339	(SCM file),
	340	"")
	341	#define FUNC_NAME s_scm_read_history
c374ab69	342	{
ad6dec05 MV	343	char *filename;
	344	SCM ret;
	345
	346	filename = scm_to_locale_string (file);
	347	ret = scm_from_bool (!read_history (filename));
	348	free (filename);
	349	return ret;
c374ab69	350	}
f48e47b9	351	#undef FUNC_NAME
c374ab69 MV	352
c374ab69 MV	353
b916d813	354	SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0,
f48e47b9 GB	355	(SCM file),
	356	"")
	357	#define FUNC_NAME s_scm_write_history
c374ab69	358	{
ad6dec05 MV	359	char *filename;
	360	SCM ret;
	361
	362	filename = scm_to_locale_string (file);
	363	ret = scm_from_bool (!write_history (filename));
	364	free (filename);
	365	return ret;
c374ab69	366	}
f48e47b9	367	#undef FUNC_NAME
c374ab69	368
8ed35a15 MV	369	SCM_DEFINE (scm_clear_history, "clear-history", 0, 0, 0,
	370	(),
	371	"Clear the history buffer of the readline machinery.")
	372	#define FUNC_NAME s_scm_clear_history
	373	{
	374	clear_history();
	375	return SCM_UNSPECIFIED;
	376	}
	377	#undef FUNC_NAME
	378
c374ab69	379
b916d813	380	SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0,
f48e47b9 GB	381	(SCM text, SCM continuep),
	382	"")
	383	#define FUNC_NAME s_scm_filename_completion_function
c374ab69 MV	384	{
	385	char *s;
	386	SCM ans;
ad6dec05	387	char *c_text = scm_to_locale_string (text);
dcb17187	388	#ifdef HAVE_RL_FILENAME_COMPLETION_FUNCTION
ad6dec05	389	s = rl_filename_completion_function (c_text, scm_is_true (continuep));
dcb17187	390	#else
ad6dec05	391	s = filename_completion_function (c_text, scm_is_true (continuep));
dcb17187	392	#endif
ad6dec05 MV	393	ans = scm_take_locale_string (s);
ad6dec05 MV	394	free (c_text);
c374ab69 MV	395	return ans;
c374ab69 MV	396	}
f48e47b9	397	#undef FUNC_NAME
c374ab69 MV	398
	399	/*
	400	* The following has been modified from code contributed by
	401	* Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>
	402	*/
	403
	404	SCM scm_readline_completion_function_var;
	405
	406	static char *
	407	completion_function (char *text, int continuep)
	408	{
296ff5e7	409	SCM compfunc = SCM_VARIABLE_REF (scm_readline_completion_function_var);
c374ab69 MV	410	SCM res;
c374ab69 MV	411
be49d1df	412	if (scm_is_false (compfunc))
c374ab69 MV	413	return NULL; /* #f => completion disabled */
	414	else
	415	{
ad6dec05	416	SCM t = scm_from_locale_string (text);
be49d1df	417	SCM c = scm_from_bool (continuep);
5b2a7b59	418	res = scm_apply (compfunc, scm_list_2 (t, c), SCM_EOL);
c374ab69	419
be49d1df	420	if (scm_is_false (res))
c374ab69 MV	421	return NULL;
c374ab69 MV	422
ad6dec05	423	return scm_to_locale_string (res);
c374ab69 MV	424	}
	425	}
	426
	427	/Bouncing parenthesis (reimplemented by GH, 11/23/98, since readline is strict gpl)/
	428
576cdec4 MD	429	static int match_paren (int x, int k);
	430	static int find_matching_paren (int k);
	431	static void init_bouncing_parens ();
c374ab69 MV	432
c374ab69 MV	433	static void
576cdec4	434	init_bouncing_parens ()
c374ab69	435	{
576cdec4 MD	436	if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
	437	{
	438	rl_bind_key (')', match_paren);
	439	rl_bind_key (']', match_paren);
	440	rl_bind_key ('}', match_paren);
	441	}
c374ab69 MV	442	}
	443
	444	static int
	445	find_matching_paren(int k)
	446	{
	447	register int i;
	448	register char c = 0;
	449	int end_parens_found = 0;
	450
	451	/* Choose the corresponding opening bracket. */
	452	if (k == ')') c = '(';
	453	else if (k == ']') c = '[';
	454	else if (k == '}') c = '{';
	455
	456	for (i=rl_point-2; i>=0; i--)
	457	{
	458	/* Is the current character part of a character literal? */
	459	if (i - 2 >= 0
	460	&& rl_line_buffer[i - 1] == '\\'
	461	&& rl_line_buffer[i - 2] == '#')
	462	;
	463	else if (rl_line_buffer[i] == k)
	464	end_parens_found++;
	465	else if (rl_line_buffer[i] == '"')
	466	{
	467	/* Skip over a string literal. */
	468	for (i--; i >= 0; i--)
	469	if (rl_line_buffer[i] == '"'
	470	&& ! (i - 1 >= 0
	471	&& rl_line_buffer[i - 1] == '\\'))
	472	break;
	473	}
	474	else if (rl_line_buffer[i] == c)
	475	{
576cdec4 MD	476	if (end_parens_found==0)
576cdec4 MD	477	return i;
c374ab69 MV	478	else --end_parens_found;
	479	}
	480	}
	481	return -1;
	482	}
	483
576cdec4 MD	484	static int
576cdec4 MD	485	match_paren (int x, int k)
c374ab69	486	{
8f99e3f3 SJ	487	int tmp;
	488	#ifndef __MINGW32__
	489	int fno;
aba2031a	490	SELECT_TYPE readset;
c374ab69	491	struct timeval timeout;
8f99e3f3 SJ	492	#endif
8f99e3f3 SJ	493
576cdec4	494	rl_insert (x, k);
c374ab69	495	if (!SCM_READLINE_BOUNCE_PARENS)
576cdec4	496	return 0;
c374ab69 MV	497
	498	/* Did we just insert a quoted paren? If so, then don't bounce. */
	499	if (rl_point - 1 >= 1
	500	&& rl_line_buffer[rl_point - 2] == '\\')
576cdec4	501	return 0;
c374ab69	502
8f99e3f3	503	#ifndef __MINGW32__
c374ab69 MV	504	tmp = 1000 * SCM_READLINE_BOUNCE_PARENS;
	505	timeout.tv_sec = tmp / 1000000;
	506	timeout.tv_usec = tmp % 1000000;
576cdec4	507	FD_ZERO (&readset);
bc858b80 MD	508	fno = fileno (rl_instream);
bc858b80 MD	509	FD_SET (fno, &readset);
8f99e3f3 SJ	510	#endif
8f99e3f3 SJ	511
576cdec4 MD	512	if (rl_point > 1)
	513	{
	514	tmp = rl_point;
	515	rl_point = find_matching_paren (k);
	516	if (rl_point > -1)
	517	{
	518	rl_redisplay ();
8f99e3f3	519	#ifndef __MINGW32__
0ddf47fc	520	scm_std_select (fno + 1, &readset, NULL, NULL, &timeout);
8f99e3f3 SJ	521	#else
	522	WaitForSingleObject (GetStdHandle(STD_INPUT_HANDLE),
	523	SCM_READLINE_BOUNCE_PARENS);
	524	#endif
576cdec4 MD	525	}
576cdec4 MD	526	rl_point = tmp;
c374ab69	527	}
576cdec4	528	return 0;
c374ab69 MV	529	}
c374ab69 MV	530
b71099ba MD	531	#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
	532	/* Readline disables SA_RESTART on SIGWINCH.
	533	* This code turns it back on.
	534	*/
	535	static int
	536	sigwinch_enable_restart (void)
	537	{
	538	#ifdef HAVE_SIGINTERRUPT
	539	siginterrupt (SIGWINCH, 0);
	540	#else
	541	struct sigaction action;
	542
	543	sigaction (SIGWINCH, NULL, &action);
	544	action.sa_flags \|= SA_RESTART;
	545	sigaction (SIGWINCH, &action, NULL);
	546	#endif
	547	return 0;
	548	}
	549	#endif
	550
26047451 MD	551	#endif /* HAVE_RL_GETC_FUNCTION */
26047451 MD	552
c374ab69 MV	553	void
	554	scm_init_readline ()
	555	{
62947883	556	#ifdef HAVE_RL_GETC_FUNCTION
a0599745	557	#include "guile-readline/readline.x"
c374ab69	558	scm_readline_completion_function_var
296ff5e7	559	= scm_c_define ("readline-completion-function", SCM_BOOL_F);
8f99e3f3	560	#ifndef __MINGW32__
c374ab69	561	rl_getc_function = current_input_getc;
8f99e3f3	562	#endif
dcb17187 MV	563	#if defined (_RL_FUNCTION_TYPEDEF)
	564	rl_completion_entry_function = (rl_compentry_func_t*) completion_function;
	565	#else
c374ab69	566	rl_completion_entry_function = (Function*) completion_function;
dcb17187	567	#endif
c374ab69	568	rl_basic_word_break_characters = "\t\n\"'`;()";
5c11cc9d	569	rl_readline_name = "Guile";
b71099ba MD	570	#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
	571	rl_pre_input_hook = sigwinch_enable_restart;
	572	#endif
5c11cc9d	573
bb0f37e7	574	reentry_barrier_mutex = scm_permanent_object (scm_make_mutex ());
c374ab69 MV	575	scm_init_opts (scm_readline_options,
	576	scm_readline_opts,
	577	SCM_N_READLINE_OPTIONS);
	578	init_bouncing_parens();
	579	scm_add_feature ("readline");
62947883	580	#endif /* HAVE_RL_GETC_FUNCTION */
c374ab69 MV	581	}
c374ab69 MV	582
89e00824 ML	583	/*
	584	Local Variables:
	585	c-file-style: "gnu"
	586	End:
	587	*/