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

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

/*	Copyright (C) 1997,1999 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., 59 Temple Place, Suite 330,
 * Boston, MA 02111-1307 USA
 *
 */

/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
   gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */

\f

#include "libguile/_scm.h"
#if defined (HAVE_RL_GETC_FUNCTION)
#include "libguile/libguile.h"
#include "libguile/gh.h"
#include "libguile/iselect.h"

#include <readline/readline.h>
#include <readline/history.h>
#include <sys/time.h>

#include "libguile/scm_validate.h"
#include "readline.h"

scm_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)
{
  int 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 ans;
  if (promptp && SCM_NIMP (before_read))
    {
      scm_apply (before_read, SCM_EOL, SCM_EOL);
      promptp = 0;
    }
  ans = scm_getc (input_port);
  return ans;
}

static void
redisplay ()
{
  rl_redisplay ();
  /* promptp = 1; */
}

static int in_readline = 0;
#ifdef USE_THREADS
static scm_mutex_t reentry_barrier_mutex;
#endif

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


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_NIMP (text) && SCM_STRINGP (text)))
	{
	  --in_readline;
	  scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	}
      SCM_COERCE_SUBSTR (text);
    }
  
  if (!((SCM_UNBNDP (inp) && SCM_NIMP (scm_cur_inp) && SCM_OPINFPORTP (inp))
	|| SCM_NIMP (inp) && 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_NIMP (scm_cur_outp) && SCM_OPINFPORTP (outp))
	|| (SCM_NIMP (outp) && 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_FALSEP (read_hook)))
    {
      if (!(SCM_NFALSEP (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_catch_body_t) internal_readline,
			    (void *) text,
			    handle_error, 0);

  fclose (rl_instream);
  fclose (rl_outstream);

  --in_readline;
  return ans;
}
#undef FUNC_NAME


static void
reentry_barrier ()
{
  int reentryp = 0;
#ifdef USE_THREADS
  /* We should rather use scm_mutex_try_lock when it becomes available */
  scm_mutex_lock (&reentry_barrier_mutex);
#endif
  if (in_readline)
    reentryp = 1;
  else
    ++in_readline;
#ifdef USE_THREADS
  scm_mutex_unlock (&reentry_barrier_mutex);
#endif
  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 */
  fclose (rl_instream);
  fclose (rl_outstream);
  --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_CHARS (text);

  promptp = 1;
  s = readline (prompt);
  if (s)
    ret = scm_makfrom0str (s);
  else 
    ret = SCM_EOF_VAL;

  free (s);

  return ret;
}

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

  fd = dup (((struct scm_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_cur_inp;
  
  if (SCM_UNBNDP (outp))
    outp = scm_cur_outp;
  
  if (!(SCM_NIMP (inp) && SCM_OPINFPORTP (inp))) {
    scm_misc_error (0,
                    "Input port is not open or not a file port",
                    SCM_EOL);
  }

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

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


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

  s = SCM_CHARS (text);
  add_history (strdup (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
{
  SCM_VALIDATE_STRING (1,file);
  return SCM_NEGATE_BOOL(read_history (SCM_ROCHARS (file)));
}
#undef FUNC_NAME


SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0, 
            (SCM file),
"")
#define FUNC_NAME s_scm_write_history
{
  SCM_VALIDATE_STRING (1,file);
  return SCM_NEGATE_BOOL(write_history (SCM_ROCHARS (file)));
}
#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;
  SCM_VALIDATE_STRING (1,text);
  SCM_COERCE_SUBSTR (text);
  s = filename_completion_function (SCM_CHARS (text), SCM_NFALSEP (continuep));
  ans = scm_makfrom0str (s);
  free (s);
  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_CDR (scm_readline_completion_function_var);
  SCM res;

  if (SCM_FALSEP (compfunc))
    return NULL; /* #f => completion disabled */
  else
    {
      SCM t = scm_makfrom0str (text);
      SCM c = continuep ? SCM_BOOL_T : SCM_BOOL_F;
      res = scm_apply (compfunc, SCM_LIST2 (t, c), SCM_EOL);
  
      if (SCM_FALSEP (res))
	return NULL;
  
      if (!(SCM_NIMP (res) && SCM_STRINGP (res)))
	scm_misc_error (s_scm_readline,
			"Completion function returned bogus value: %S",
			SCM_LIST1 (res));
      SCM_COERCE_SUBSTR (res);
      return strdup (SCM_CHARS (res));
    }
}

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

static void 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 void
match_paren(int x, int k)
{
  int tmp;
  fd_set readset;
  struct timeval timeout;
  
  rl_insert(x, k);
  if (!SCM_READLINE_BOUNCE_PARENS)
    return;

  /* 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;

  tmp = 1000 * SCM_READLINE_BOUNCE_PARENS;
  timeout.tv_sec = tmp / 1000000;
  timeout.tv_usec = tmp % 1000000;
  FD_ZERO(&readset);
  FD_SET(fileno(rl_instream), &readset);
  
  if(rl_point > 1) {
    tmp = rl_point;
    rl_point = find_matching_paren(k);
    if(rl_point > -1) {
      rl_redisplay();
      scm_internal_select(1, &readset, NULL, NULL, &timeout);
    }
    rl_point = tmp;
  }
}


void
scm_init_readline ()
{
#include "readline.x"
  scm_readline_completion_function_var
    = scm_sysintern ("*readline-completion-function*", SCM_BOOL_F);
  rl_getc_function = current_input_getc;
  rl_redisplay_function = redisplay;
  rl_completion_entry_function = (Function*) completion_function;
  rl_basic_word_break_characters = "\t\n\"'`;()";
  rl_readline_name = "Guile";

#ifdef USE_THREADS
  scm_mutex_init (&reentry_barrier_mutex);
#endif
  scm_init_opts (scm_readline_options,
		 scm_readline_opts,
		 SCM_N_READLINE_OPTIONS);
  init_bouncing_parens();
  scm_add_feature ("readline");
}

#endif
Commit	Line	Data
c374ab69 MV	1	/* readline.c --- line editing support for Guile */
	2
	3	/* Copyright (C) 1997,1999 Free Software Foundation, Inc.
	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
c6e23ea2 JB	17	* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
c6e23ea2 JB	18	* Boston, MA 02111-1307 USA
c374ab69 MV	19	*
c374ab69 MV	20	*/
f48e47b9 GB	21
	22	/* Software engineering face-lift by Greg J. Badros, 11-Dec-1999,
	23	gjb@cs.washington.edu, http://www.cs.washington.edu/homes/gjb */
	24
c374ab69 MV	25	\f
c374ab69 MV	26
739b3bf1	27	#include "libguile/_scm.h"
c374ab69	28	#if defined (HAVE_RL_GETC_FUNCTION)
739b3bf1 MD	29	#include "libguile/libguile.h"
	30	#include "libguile/gh.h"
	31	#include "libguile/iselect.h"
	32
c374ab69 MV	33	#include <readline/readline.h>
c374ab69 MV	34	#include <readline/history.h>
c374ab69	35	#include <sys/time.h>
c374ab69	36
eb156192	37	#include "libguile/scm_validate.h"
739b3bf1	38	#include "readline.h"
c374ab69 MV	39
	40	scm_option scm_readline_opts[] = {
	41	{ SCM_OPTION_BOOLEAN, "history-file", 1,
	42	"Use history file." },
	43	{ SCM_OPTION_INTEGER, "history-length", 200,
	44	"History length." },
	45	{ SCM_OPTION_INTEGER, "bounce-parens", 500,
	46	"Time (ms) to show matching opening parenthesis (0 = off)."}
	47	};
	48
	49	extern void stifle_history (int max);
	50
b916d813	51	SCM_DEFINE (scm_readline_options, "readline-options-interface", 0, 1, 0,
f48e47b9 GB	52	(SCM setting),
	53	"")
	54	#define FUNC_NAME s_scm_readline_options
c374ab69 MV	55	{
	56	SCM ans = scm_options (setting,
	57	scm_readline_opts,
	58	SCM_N_READLINE_OPTIONS,
f48e47b9	59	FUNC_NAME);
c374ab69 MV	60	stifle_history (SCM_HISTORY_LENGTH);
	61	return ans;
	62	}
f48e47b9	63	#undef FUNC_NAME
c374ab69 MV	64
	65	#ifndef HAVE_STRDUP
	66	static char *
	67	strdup (char *s)
	68	{
	69	int len = strlen (s);
	70	char *new = malloc (len + 1);
	71	strcpy (new, s);
	72	return new;
	73	}
	74	#endif /* HAVE_STRDUP */
	75
	76	#ifndef HAVE_RL_CLEANUP_AFTER_SIGNAL
	77
	78	/* These are readline functions added in release 2.3. They will work
	79	* together with readline-2.1 and 2.2. (The readline interface is
	80	* disabled for earlier releases.)
	81	* They are declared static; if we want to use them elsewhere, then
	82	* we need external declarations for them, but at the moment, I don't
	83	* think anything else in Guile ought to use these.
	84	*/
	85
	86	extern void _rl_clean_up_for_exit ();
	87	extern void _rl_kill_kbd_macro ();
	88	extern int _rl_init_argument ();
	89
2e3d5987	90	void
c374ab69 MV	91	rl_cleanup_after_signal ()
	92	{
	93	#ifdef HAVE_RL_CLEAR_SIGNALS
	94	_rl_clean_up_for_exit ();
	95	#endif
	96	(*rl_deprep_term_function) ();
	97	#ifdef HAVE_RL_CLEAR_SIGNALS
	98	rl_clear_signals ();
	99	#endif
	100	rl_pending_input = 0;
	101	}
	102
2e3d5987	103	void
c374ab69 MV	104	rl_free_line_state ()
	105	{
	106	register HIST_ENTRY *entry;
	107
	108	free_undo_list ();
	109
	110	entry = current_history ();
	111	if (entry)
	112	entry->data = (char *)NULL;
	113
	114	_rl_kill_kbd_macro ();
	115	rl_clear_message ();
	116	_rl_init_argument ();
	117	}
	118
	119	#endif /* !HAVE_RL_CLEANUP_AFTER_SIGNAL */
	120
	121	static int promptp;
	122	static SCM input_port;
	123	static SCM before_read;
	124
	125	static int
	126	current_input_getc (FILE *in)
	127	{
	128	SCM ans;
	129	if (promptp && SCM_NIMP (before_read))
	130	{
	131	scm_apply (before_read, SCM_EOL, SCM_EOL);
	132	promptp = 0;
	133	}
	134	ans = scm_getc (input_port);
	135	return ans;
	136	}
	137
	138	static void
	139	redisplay ()
	140	{
	141	rl_redisplay ();
	142	/* promptp = 1; */
	143	}
	144
c374ab69 MV	145	static int in_readline = 0;
	146	#ifdef USE_THREADS
	147	static scm_mutex_t reentry_barrier_mutex;
	148	#endif
	149
f48e47b9 GB	150	static SCM internal_readline (SCM text);
	151	static SCM handle_error (void *data, SCM tag, SCM args);
	152	static void reentry_barrier ();
	153
	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	{
	168	if (!(SCM_NIMP (text) && SCM_STRINGP (text)))
	169	{
	170	--in_readline;
	171	scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	172	}
	173	SCM_COERCE_SUBSTR (text);
	174	}
	175
	176	if (!((SCM_UNBNDP (inp) && SCM_NIMP (scm_cur_inp) && SCM_OPINFPORTP (inp))
	177	\|\| SCM_NIMP (inp) && SCM_OPINFPORTP (inp)))
	178	{
	179	--in_readline;
	180	scm_misc_error (s_scm_readline,
	181	"Input port is not open or not a file port",
	182	SCM_EOL);
	183	}
	184
	185	if (!((SCM_UNBNDP (outp) && SCM_NIMP (scm_cur_outp) && SCM_OPINFPORTP (outp))
	186	\|\| (SCM_NIMP (outp) && SCM_OPOUTFPORTP (outp))))
	187	{
	188	--in_readline;
	189	scm_misc_error (s_scm_readline,
	190	"Output port is not open or not a file port",
	191	SCM_EOL);
	192	}
	193
	194	if (!(SCM_UNBNDP (read_hook) \|\| SCM_FALSEP (read_hook)))
	195	{
	196	if (!(SCM_NFALSEP (scm_thunk_p (read_hook))))
	197	{
	198	--in_readline;
	199	scm_wrong_type_arg (s_scm_readline, SCM_ARG4, read_hook);
	200	}
	201	before_read = read_hook;
	202	}
	203
	204	scm_readline_init_ports (inp, outp);
	205
	206	ans = scm_internal_catch (SCM_BOOL_T,
	207	(scm_catch_body_t) internal_readline,
	208	(void *) text,
	209	handle_error, 0);
	210
	211	fclose (rl_instream);
	212	fclose (rl_outstream);
	213
	214	--in_readline;
	215	return ans;
	216	}
	217	#undef FUNC_NAME
	218
	219
c374ab69 MV	220	static void
	221	reentry_barrier ()
	222	{
	223	int reentryp = 0;
	224	#ifdef USE_THREADS
	225	/* We should rather use scm_mutex_try_lock when it becomes available */
	226	scm_mutex_lock (&reentry_barrier_mutex);
	227	#endif
	228	if (in_readline)
	229	reentryp = 1;
	230	else
	231	++in_readline;
	232	#ifdef USE_THREADS
	233	scm_mutex_unlock (&reentry_barrier_mutex);
	234	#endif
	235	if (reentryp)
f48e47b9	236	scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL);
c374ab69 MV	237	}
	238
	239	static SCM
	240	handle_error (void *data, SCM tag, SCM args)
	241	{
	242	rl_free_line_state ();
	243	rl_cleanup_after_signal ();
739b3bf1	244	fputc ('\n', rl_outstream); /* We don't want next output on this line */
c374ab69 MV	245	fclose (rl_instream);
	246	fclose (rl_outstream);
	247	--in_readline;
	248	scm_handle_by_throw (data, tag, args);
	249	return SCM_UNSPECIFIED; /* never reached */
	250	}
	251
	252	static SCM
	253	internal_readline (SCM text)
	254	{
	255	SCM ret;
	256	char *s;
	257	char *prompt = SCM_UNBNDP (text) ? "" : SCM_CHARS (text);
	258
	259	promptp = 1;
	260	s = readline (prompt);
	261	if (s)
	262	ret = scm_makfrom0str (s);
	263	else
	264	ret = SCM_EOF_VAL;
	265
	266	free (s);
	267
	268	return ret;
	269	}
	270
	271	static FILE *
	272	stream_from_fport (SCM port, char mode, const char subr)
	273	{
	274	int fd;
	275	FILE *f;
	276
	277	fd = dup (((struct scm_fport *) SCM_STREAM (port))->fdes);
	278	if (fd == -1)
	279	{
	280	--in_readline;
	281	scm_syserror (subr);
	282	}
	283
	284	f = fdopen (fd, mode);
	285	if (f == NULL)
	286	{
	287	--in_readline;
	288	scm_syserror (subr);
	289	}
	290
	291	return f;
	292	}
	293
2e3d5987 MD	294	void
	295	scm_readline_init_ports (SCM inp, SCM outp)
	296	{
	297	if (SCM_UNBNDP (inp))
	298	inp = scm_cur_inp;
	299
	300	if (SCM_UNBNDP (outp))
	301	outp = scm_cur_outp;
	302
	303	if (!(SCM_NIMP (inp) && SCM_OPINFPORTP (inp))) {
	304	scm_misc_error (0,
	305	"Input port is not open or not a file port",
	306	SCM_EOL);
	307	}
	308
	309	if (!(SCM_NIMP (outp) && SCM_OPOUTFPORTP (outp))) {
	310	scm_misc_error (0,
	311	"Output port is not open or not a file port",
	312	SCM_EOL);
	313	}
	314
	315	input_port = inp;
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);
2e3d5987 MD	318	}
2e3d5987 MD	319
c374ab69	320
c374ab69	321
b916d813	322	SCM_DEFINE (scm_add_history, "add-history", 1, 0, 0,
f48e47b9 GB	323	(SCM text),
	324	"")
	325	#define FUNC_NAME s_scm_add_history
c374ab69 MV	326	{
c374ab69 MV	327	char* s;
cbaee92a	328	SCM_VALIDATE_STRING (1,text);
c374ab69 MV	329	SCM_COERCE_SUBSTR (text);
	330
	331	s = SCM_CHARS (text);
	332	add_history (strdup (s));
	333
	334	return SCM_UNSPECIFIED;
	335	}
f48e47b9	336	#undef FUNC_NAME
c374ab69 MV	337
c374ab69 MV	338
b916d813	339	SCM_DEFINE (scm_read_history, "read-history", 1, 0, 0,
f48e47b9 GB	340	(SCM file),
	341	"")
	342	#define FUNC_NAME s_scm_read_history
c374ab69	343	{
cbaee92a	344	SCM_VALIDATE_STRING (1,file);
f48e47b9	345	return SCM_NEGATE_BOOL(read_history (SCM_ROCHARS (file)));
c374ab69	346	}
f48e47b9	347	#undef FUNC_NAME
c374ab69 MV	348
c374ab69 MV	349
b916d813	350	SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0,
f48e47b9 GB	351	(SCM file),
	352	"")
	353	#define FUNC_NAME s_scm_write_history
c374ab69	354	{
cbaee92a	355	SCM_VALIDATE_STRING (1,file);
f48e47b9	356	return SCM_NEGATE_BOOL(write_history (SCM_ROCHARS (file)));
c374ab69	357	}
f48e47b9	358	#undef FUNC_NAME
c374ab69 MV	359
c374ab69 MV	360
b916d813	361	SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0,
f48e47b9 GB	362	(SCM text, SCM continuep),
	363	"")
	364	#define FUNC_NAME s_scm_filename_completion_function
c374ab69 MV	365	{
	366	char *s;
	367	SCM ans;
cbaee92a	368	SCM_VALIDATE_STRING (1,text);
c374ab69 MV	369	SCM_COERCE_SUBSTR (text);
	370	s = filename_completion_function (SCM_CHARS (text), SCM_NFALSEP (continuep));
	371	ans = scm_makfrom0str (s);
	372	free (s);
	373	return ans;
	374	}
f48e47b9	375	#undef FUNC_NAME
c374ab69 MV	376
	377	/*
	378	* The following has been modified from code contributed by
	379	* Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>
	380	*/
	381
	382	SCM scm_readline_completion_function_var;
	383
	384	static char *
	385	completion_function (char *text, int continuep)
	386	{
	387	SCM compfunc = SCM_CDR (scm_readline_completion_function_var);
	388	SCM res;
	389
	390	if (SCM_FALSEP (compfunc))
	391	return NULL; /* #f => completion disabled */
	392	else
	393	{
	394	SCM t = scm_makfrom0str (text);
	395	SCM c = continuep ? SCM_BOOL_T : SCM_BOOL_F;
	396	res = scm_apply (compfunc, SCM_LIST2 (t, c), SCM_EOL);
	397
	398	if (SCM_FALSEP (res))
	399	return NULL;
	400
	401	if (!(SCM_NIMP (res) && SCM_STRINGP (res)))
f48e47b9	402	scm_misc_error (s_scm_readline,
c374ab69 MV	403	"Completion function returned bogus value: %S",
	404	SCM_LIST1 (res));
	405	SCM_COERCE_SUBSTR (res);
	406	return strdup (SCM_CHARS (res));
	407	}
	408	}
	409
	410	/Bouncing parenthesis (reimplemented by GH, 11/23/98, since readline is strict gpl)/
	411
	412	static void match_paren(int x, int k);
	413	static int find_matching_paren(int k);
	414	static void init_bouncing_parens();
	415
	416	static void
	417	init_bouncing_parens()
	418	{
	419	if(strncmp(rl_get_keymap_name(rl_get_keymap()), "vi", 2)) {
	420	rl_bind_key(')', match_paren);
	421	rl_bind_key(']', match_paren);
	422	rl_bind_key('}', match_paren);
	423	}
	424	}
	425
	426	static int
	427	find_matching_paren(int k)
	428	{
	429	register int i;
	430	register char c = 0;
	431	int end_parens_found = 0;
	432
	433	/* Choose the corresponding opening bracket. */
	434	if (k == ')') c = '(';
	435	else if (k == ']') c = '[';
	436	else if (k == '}') c = '{';
	437
	438	for (i=rl_point-2; i>=0; i--)
	439	{
	440	/* Is the current character part of a character literal? */
	441	if (i - 2 >= 0
	442	&& rl_line_buffer[i - 1] == '\\'
	443	&& rl_line_buffer[i - 2] == '#')
	444	;
	445	else if (rl_line_buffer[i] == k)
	446	end_parens_found++;
	447	else if (rl_line_buffer[i] == '"')
	448	{
	449	/* Skip over a string literal. */
	450	for (i--; i >= 0; i--)
	451	if (rl_line_buffer[i] == '"'
	452	&& ! (i - 1 >= 0
	453	&& rl_line_buffer[i - 1] == '\\'))
	454	break;
	455	}
	456	else if (rl_line_buffer[i] == c)
	457	{
	458	if (end_parens_found==0) return i;
	459	else --end_parens_found;
	460	}
	461	}
	462	return -1;
	463	}
	464
	465	static void
	466	match_paren(int x, int k)
467	{
468	int tmp;
469	fd_set readset;
470	struct timeval timeout;
471
472	rl_insert(x, k);
473	if (!SCM_READLINE_BOUNCE_PARENS)
474	return;
475
476	/* Did we just insert a quoted paren? If so, then don't bounce. */
477	if (rl_point - 1 >= 1
478	&& rl_line_buffer[rl_point - 2] == '\\')
479	return;
480
481	tmp = 1000 * SCM_READLINE_BOUNCE_PARENS;
482	timeout.tv_sec = tmp / 1000000;
483	timeout.tv_usec = tmp % 1000000;
484	FD_ZERO(&readset);
485	FD_SET(fileno(rl_instream), &readset);
486
487	if(rl_point > 1) {
488	tmp = rl_point;
489	rl_point = find_matching_paren(k);
490	if(rl_point > -1) {
491	rl_redisplay();
492	scm_internal_select(1, &readset, NULL, NULL, &timeout);
493	}
494	rl_point = tmp;
495	}
496	}
497
498
499	void
500	scm_init_readline ()
501	{
502	#include "readline.x"
503	scm_readline_completion_function_var
504	= scm_sysintern ("readline-completion-function", SCM_BOOL_F);
505	rl_getc_function = current_input_getc;
506	rl_redisplay_function = redisplay;
507	rl_completion_entry_function = (Function*) completion_function;
508	rl_basic_word_break_characters = "\t\n\"'`;()";
5c11cc9d GH	509	rl_readline_name = "Guile";
5c11cc9d GH	510
c374ab69	511	#ifdef USE_THREADS
28c12e2a	512	scm_mutex_init (&reentry_barrier_mutex);
c374ab69 MV	513	#endif
	514	scm_init_opts (scm_readline_options,
	515	scm_readline_opts,
	516	SCM_N_READLINE_OPTIONS);
	517	init_bouncing_parens();
	518	scm_add_feature ("readline");
	519	}
	520
	521	#endif