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

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

/*	Copyright (C) 1997,1999, 2000 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"
#ifdef HAVE_RL_GETC_FUNCTION
#include "libguile.h"
#include "libguile/gh.h"
#include "libguile/iselect.h"

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <readline/readline.h>
#include <readline/history.h>
#include <sys/time.h>

#include "libguile/validate.h"
#include "guile-readline/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)
{
  if (promptp && SCM_NIMP (before_read))
    {
      scm_apply (before_read, SCM_EOL, SCM_EOL);
      promptp = 0;
    }
  return scm_getc (input_port);
}

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 (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_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 *) SCM_UNPACK (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 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, fno;
  SELECT_TYPE readset;
  struct timeval timeout;
  
  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;

  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);
  
  if (rl_point > 1)
    {
      tmp = rl_point;
      rl_point = find_matching_paren (k);
      if (rl_point > -1)
	{
	  rl_redisplay ();
	  scm_internal_select (fno + 1, &readset, NULL, NULL, &timeout);
	}
      rl_point = tmp;
    }
  return 0;
}

#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_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 /* 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
576cdec4	3	/* Copyright (C) 1997,1999, 2000 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
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"
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
48552b1d MD	33	#ifdef HAVE_UNISTD_H
	34	#include <unistd.h>
	35	#endif
c374ab69 MV	36	#include <readline/readline.h>
c374ab69 MV	37	#include <readline/history.h>
c374ab69	38	#include <sys/time.h>
c374ab69	39
1c537018	40	#include "libguile/validate.h"
a0599745	41	#include "guile-readline/readline.h"
c374ab69 MV	42
	43	scm_option scm_readline_opts[] = {
	44	{ SCM_OPTION_BOOLEAN, "history-file", 1,
	45	"Use history file." },
	46	{ SCM_OPTION_INTEGER, "history-length", 200,
	47	"History length." },
	48	{ SCM_OPTION_INTEGER, "bounce-parens", 500,
	49	"Time (ms) to show matching opening parenthesis (0 = off)."}
	50	};
	51
	52	extern void stifle_history (int max);
	53
b916d813	54	SCM_DEFINE (scm_readline_options, "readline-options-interface", 0, 1, 0,
f48e47b9 GB	55	(SCM setting),
	56	"")
	57	#define FUNC_NAME s_scm_readline_options
c374ab69 MV	58	{
	59	SCM ans = scm_options (setting,
	60	scm_readline_opts,
	61	SCM_N_READLINE_OPTIONS,
f48e47b9	62	FUNC_NAME);
c374ab69 MV	63	stifle_history (SCM_HISTORY_LENGTH);
	64	return ans;
	65	}
f48e47b9	66	#undef FUNC_NAME
c374ab69 MV	67
	68	#ifndef HAVE_STRDUP
	69	static char *
	70	strdup (char *s)
	71	{
	72	int len = strlen (s);
	73	char *new = malloc (len + 1);
	74	strcpy (new, s);
	75	return new;
	76	}
	77	#endif /* HAVE_STRDUP */
	78
	79	#ifndef HAVE_RL_CLEANUP_AFTER_SIGNAL
	80
	81	/* These are readline functions added in release 2.3. They will work
	82	* together with readline-2.1 and 2.2. (The readline interface is
	83	* disabled for earlier releases.)
	84	* They are declared static; if we want to use them elsewhere, then
	85	* we need external declarations for them, but at the moment, I don't
	86	* think anything else in Guile ought to use these.
	87	*/
	88
	89	extern void _rl_clean_up_for_exit ();
	90	extern void _rl_kill_kbd_macro ();
	91	extern int _rl_init_argument ();
	92
2e3d5987	93	void
c374ab69 MV	94	rl_cleanup_after_signal ()
	95	{
	96	#ifdef HAVE_RL_CLEAR_SIGNALS
	97	_rl_clean_up_for_exit ();
	98	#endif
	99	(*rl_deprep_term_function) ();
	100	#ifdef HAVE_RL_CLEAR_SIGNALS
	101	rl_clear_signals ();
	102	#endif
	103	rl_pending_input = 0;
	104	}
	105
2e3d5987	106	void
c374ab69 MV	107	rl_free_line_state ()
	108	{
	109	register HIST_ENTRY *entry;
	110
	111	free_undo_list ();
	112
	113	entry = current_history ();
	114	if (entry)
	115	entry->data = (char *)NULL;
	116
	117	_rl_kill_kbd_macro ();
	118	rl_clear_message ();
	119	_rl_init_argument ();
	120	}
	121
	122	#endif /* !HAVE_RL_CLEANUP_AFTER_SIGNAL */
	123
	124	static int promptp;
	125	static SCM input_port;
	126	static SCM before_read;
	127
	128	static int
	129	current_input_getc (FILE *in)
	130	{
c374ab69 MV	131	if (promptp && SCM_NIMP (before_read))
	132	{
	133	scm_apply (before_read, SCM_EOL, SCM_EOL);
	134	promptp = 0;
	135	}
bc858b80	136	return scm_getc (input_port);
c374ab69 MV	137	}
	138
	139	static void
	140	redisplay ()
	141	{
	142	rl_redisplay ();
	143	/* promptp = 1; */
	144	}
	145
c374ab69 MV	146	static int in_readline = 0;
	147	#ifdef USE_THREADS
	148	static scm_mutex_t reentry_barrier_mutex;
	149	#endif
	150
f48e47b9 GB	151	static SCM internal_readline (SCM text);
f48e47b9 GB	152	static SCM handle_error (void *data, SCM tag, SCM args);
48552b1d	153	static void reentry_barrier (void);
f48e47b9 GB	154
f48e47b9 GB	155
b916d813	156	SCM_DEFINE (scm_readline, "%readline", 0, 4, 0,
f48e47b9 GB	157	(SCM text, SCM inp, SCM outp, SCM read_hook),
	158	"")
	159	#define FUNC_NAME s_scm_readline
	160	{
	161	SCM ans;
	162
	163	reentry_barrier ();
	164
	165	before_read = SCM_BOOL_F;
	166
	167	if (!SCM_UNBNDP (text))
	168	{
	169	if (!(SCM_NIMP (text) && SCM_STRINGP (text)))
	170	{
	171	--in_readline;
	172	scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	173	}
	174	SCM_COERCE_SUBSTR (text);
	175	}
	176
	177	if (!((SCM_UNBNDP (inp) && SCM_NIMP (scm_cur_inp) && SCM_OPINFPORTP (inp))
48552b1d	178	\|\| (SCM_NIMP (inp) && SCM_OPINFPORTP (inp))))
f48e47b9 GB	179	{
	180	--in_readline;
	181	scm_misc_error (s_scm_readline,
	182	"Input port is not open or not a file port",
	183	SCM_EOL);
	184	}
	185
	186	if (!((SCM_UNBNDP (outp) && SCM_NIMP (scm_cur_outp) && SCM_OPINFPORTP (outp))
	187	\|\| (SCM_NIMP (outp) && SCM_OPOUTFPORTP (outp))))
	188	{
	189	--in_readline;
	190	scm_misc_error (s_scm_readline,
	191	"Output port is not open or not a file port",
	192	SCM_EOL);
	193	}
	194
	195	if (!(SCM_UNBNDP (read_hook) \|\| SCM_FALSEP (read_hook)))
	196	{
	197	if (!(SCM_NFALSEP (scm_thunk_p (read_hook))))
	198	{
	199	--in_readline;
	200	scm_wrong_type_arg (s_scm_readline, SCM_ARG4, read_hook);
	201	}
	202	before_read = read_hook;
	203	}
	204
	205	scm_readline_init_ports (inp, outp);
	206
	207	ans = scm_internal_catch (SCM_BOOL_T,
	208	(scm_catch_body_t) internal_readline,
f60d011a	209	(void *) SCM_UNPACK (text),
f48e47b9 GB	210	handle_error, 0);
	211
	212	fclose (rl_instream);
	213	fclose (rl_outstream);
	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;
	225	#ifdef USE_THREADS
	226	/* We should rather use scm_mutex_try_lock when it becomes available */
	227	scm_mutex_lock (&reentry_barrier_mutex);
	228	#endif
	229	if (in_readline)
	230	reentryp = 1;
	231	else
	232	++in_readline;
	233	#ifdef USE_THREADS
	234	scm_mutex_unlock (&reentry_barrier_mutex);
	235	#endif
	236	if (reentryp)
f48e47b9	237	scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL);
c374ab69 MV	238	}
	239
	240	static SCM
	241	handle_error (void *data, SCM tag, SCM args)
	242	{
	243	rl_free_line_state ();
	244	rl_cleanup_after_signal ();
739b3bf1	245	fputc ('\n', rl_outstream); /* We don't want next output on this line */
c374ab69 MV	246	fclose (rl_instream);
	247	fclose (rl_outstream);
	248	--in_readline;
	249	scm_handle_by_throw (data, tag, args);
	250	return SCM_UNSPECIFIED; /* never reached */
	251	}
	252
	253	static SCM
	254	internal_readline (SCM text)
	255	{
	256	SCM ret;
	257	char *s;
	258	char *prompt = SCM_UNBNDP (text) ? "" : SCM_CHARS (text);
	259
	260	promptp = 1;
	261	s = readline (prompt);
	262	if (s)
	263	ret = scm_makfrom0str (s);
	264	else
	265	ret = SCM_EOF_VAL;
	266
	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
	278	fd = dup (((struct scm_fport *) SCM_STREAM (port))->fdes);
	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))
	299	inp = scm_cur_inp;
	300
	301	if (SCM_UNBNDP (outp))
	302	outp = scm_cur_outp;
	303
	304	if (!(SCM_NIMP (inp) && SCM_OPINFPORTP (inp))) {
	305	scm_misc_error (0,
	306	"Input port is not open or not a file port",
	307	SCM_EOL);
	308	}
	309
	310	if (!(SCM_NIMP (outp) && SCM_OPOUTFPORTP (outp))) {
	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;
f48e47b9 GB	317	rl_instream = stream_from_fport (inp, "r", s_scm_readline);
f48e47b9 GB	318	rl_outstream = stream_from_fport (outp, "w", s_scm_readline);
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;
cbaee92a	329	SCM_VALIDATE_STRING (1,text);
c374ab69 MV	330	SCM_COERCE_SUBSTR (text);
	331
	332	s = SCM_CHARS (text);
	333	add_history (strdup (s));
	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	{
cbaee92a	345	SCM_VALIDATE_STRING (1,file);
f48e47b9	346	return SCM_NEGATE_BOOL(read_history (SCM_ROCHARS (file)));
c374ab69	347	}
f48e47b9	348	#undef FUNC_NAME
c374ab69 MV	349
c374ab69 MV	350
b916d813	351	SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0,
f48e47b9 GB	352	(SCM file),
	353	"")
	354	#define FUNC_NAME s_scm_write_history
c374ab69	355	{
cbaee92a	356	SCM_VALIDATE_STRING (1,file);
f48e47b9	357	return SCM_NEGATE_BOOL(write_history (SCM_ROCHARS (file)));
c374ab69	358	}
f48e47b9	359	#undef FUNC_NAME
c374ab69 MV	360
c374ab69 MV	361
b916d813	362	SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0,
f48e47b9 GB	363	(SCM text, SCM continuep),
	364	"")
	365	#define FUNC_NAME s_scm_filename_completion_function
c374ab69 MV	366	{
	367	char *s;
	368	SCM ans;
cbaee92a	369	SCM_VALIDATE_STRING (1,text);
c374ab69 MV	370	SCM_COERCE_SUBSTR (text);
	371	s = filename_completion_function (SCM_CHARS (text), SCM_NFALSEP (continuep));
	372	ans = scm_makfrom0str (s);
	373	free (s);
	374	return ans;
	375	}
f48e47b9	376	#undef FUNC_NAME
c374ab69 MV	377
	378	/*
	379	* The following has been modified from code contributed by
	380	* Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>
	381	*/
	382
	383	SCM scm_readline_completion_function_var;
	384
	385	static char *
	386	completion_function (char *text, int continuep)
	387	{
	388	SCM compfunc = SCM_CDR (scm_readline_completion_function_var);
	389	SCM res;
	390
	391	if (SCM_FALSEP (compfunc))
	392	return NULL; /* #f => completion disabled */
	393	else
	394	{
	395	SCM t = scm_makfrom0str (text);
	396	SCM c = continuep ? SCM_BOOL_T : SCM_BOOL_F;
	397	res = scm_apply (compfunc, SCM_LIST2 (t, c), SCM_EOL);
	398
	399	if (SCM_FALSEP (res))
	400	return NULL;
	401
	402	if (!(SCM_NIMP (res) && SCM_STRINGP (res)))
f48e47b9	403	scm_misc_error (s_scm_readline,
c374ab69 MV	404	"Completion function returned bogus value: %S",
	405	SCM_LIST1 (res));
	406	SCM_COERCE_SUBSTR (res);
	407	return strdup (SCM_CHARS (res));
	408	}
	409	}
	410
	411	/Bouncing parenthesis (reimplemented by GH, 11/23/98, since readline is strict gpl)/
	412
576cdec4 MD	413	static int match_paren (int x, int k);
	414	static int find_matching_paren (int k);
	415	static void init_bouncing_parens ();
c374ab69 MV	416
c374ab69 MV	417	static void
576cdec4	418	init_bouncing_parens ()
c374ab69	419	{
576cdec4 MD	420	if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
	421	{
	422	rl_bind_key (')', match_paren);
	423	rl_bind_key (']', match_paren);
	424	rl_bind_key ('}', match_paren);
	425	}
c374ab69 MV	426	}
	427
	428	static int
	429	find_matching_paren(int k)
	430	{
	431	register int i;
	432	register char c = 0;
	433	int end_parens_found = 0;
	434
	435	/* Choose the corresponding opening bracket. */
	436	if (k == ')') c = '(';
	437	else if (k == ']') c = '[';
	438	else if (k == '}') c = '{';
	439
	440	for (i=rl_point-2; i>=0; i--)
	441	{
	442	/* Is the current character part of a character literal? */
	443	if (i - 2 >= 0
	444	&& rl_line_buffer[i - 1] == '\\'
	445	&& rl_line_buffer[i - 2] == '#')
	446	;
	447	else if (rl_line_buffer[i] == k)
	448	end_parens_found++;
	449	else if (rl_line_buffer[i] == '"')
	450	{
	451	/* Skip over a string literal. */
	452	for (i--; i >= 0; i--)
	453	if (rl_line_buffer[i] == '"'
	454	&& ! (i - 1 >= 0
	455	&& rl_line_buffer[i - 1] == '\\'))
	456	break;
	457	}
	458	else if (rl_line_buffer[i] == c)
	459	{
576cdec4 MD	460	if (end_parens_found==0)
576cdec4 MD	461	return i;
c374ab69 MV	462	else --end_parens_found;
	463	}
	464	}
	465	return -1;
	466	}
	467
576cdec4 MD	468	static int
576cdec4 MD	469	match_paren (int x, int k)
c374ab69	470	{
bc858b80	471	int tmp, fno;
aba2031a	472	SELECT_TYPE readset;
c374ab69 MV	473	struct timeval timeout;
c374ab69 MV	474
576cdec4	475	rl_insert (x, k);
c374ab69	476	if (!SCM_READLINE_BOUNCE_PARENS)
576cdec4	477	return 0;
c374ab69 MV	478
	479	/* Did we just insert a quoted paren? If so, then don't bounce. */
	480	if (rl_point - 1 >= 1
	481	&& rl_line_buffer[rl_point - 2] == '\\')
576cdec4	482	return 0;
c374ab69 MV	483
	484	tmp = 1000 * SCM_READLINE_BOUNCE_PARENS;
	485	timeout.tv_sec = tmp / 1000000;
	486	timeout.tv_usec = tmp % 1000000;
576cdec4	487	FD_ZERO (&readset);
bc858b80 MD	488	fno = fileno (rl_instream);
bc858b80 MD	489	FD_SET (fno, &readset);
c374ab69	490
576cdec4 MD	491	if (rl_point > 1)
	492	{
	493	tmp = rl_point;
	494	rl_point = find_matching_paren (k);
	495	if (rl_point > -1)
	496	{
	497	rl_redisplay ();
bc858b80	498	scm_internal_select (fno + 1, &readset, NULL, NULL, &timeout);
576cdec4 MD	499	}
576cdec4 MD	500	rl_point = tmp;
c374ab69	501	}
576cdec4	502	return 0;
c374ab69 MV	503	}
c374ab69 MV	504
62947883	505	#endif /* HAVE_RL_GETC_FUNCTION */
c374ab69 MV	506
	507	void
	508	scm_init_readline ()
	509	{
62947883	510	#ifdef HAVE_RL_GETC_FUNCTION
a0599745	511	#include "guile-readline/readline.x"
c374ab69 MV	512	scm_readline_completion_function_var
	513	= scm_sysintern ("readline-completion-function", SCM_BOOL_F);
	514	rl_getc_function = current_input_getc;
	515	rl_redisplay_function = redisplay;
	516	rl_completion_entry_function = (Function*) completion_function;
	517	rl_basic_word_break_characters = "\t\n\"'`;()";
5c11cc9d GH	518	rl_readline_name = "Guile";
5c11cc9d GH	519
c374ab69	520	#ifdef USE_THREADS
b74b1a63	521	scm_mutex_init (&reentry_barrier_mutex);
c374ab69 MV	522	#endif
	523	scm_init_opts (scm_readline_options,
	524	scm_readline_opts,
	525	SCM_N_READLINE_OPTIONS);
	526	init_bouncing_parens();
	527	scm_add_feature ("readline");
62947883	528	#endif /* HAVE_RL_GETC_FUNCTION */
c374ab69 MV	529	}
c374ab69 MV	530
89e00824 ML	531	/*
	532	Local Variables:
	533	c-file-style: "gnu"
	534	End:
	535	*/