[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 <signal.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_STRING_COERCE_0TERMINATION_X (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_STRING_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_STRING_COERCE_0TERMINATION_X (text);

  s = SCM_STRING_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_STRING_CHARS (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_STRING_CHARS (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_STRING_COERCE_0TERMINATION_X (text);
  s = filename_completion_function (SCM_STRING_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_STRING_COERCE_0TERMINATION_X (res);
      return strdup (SCM_STRING_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;
}

#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_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";
#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
  rl_pre_input_hook = sigwinch_enable_restart;
#endif

#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>
b71099ba	39	#include <signal.h>
c374ab69	40
1c537018	41	#include "libguile/validate.h"
a0599745	42	#include "guile-readline/readline.h"
c374ab69 MV	43
	44	scm_option scm_readline_opts[] = {
	45	{ SCM_OPTION_BOOLEAN, "history-file", 1,
	46	"Use history file." },
	47	{ SCM_OPTION_INTEGER, "history-length", 200,
	48	"History length." },
	49	{ SCM_OPTION_INTEGER, "bounce-parens", 500,
	50	"Time (ms) to show matching opening parenthesis (0 = off)."}
	51	};
	52
	53	extern void stifle_history (int max);
	54
b916d813	55	SCM_DEFINE (scm_readline_options, "readline-options-interface", 0, 1, 0,
f48e47b9 GB	56	(SCM setting),
	57	"")
	58	#define FUNC_NAME s_scm_readline_options
c374ab69 MV	59	{
	60	SCM ans = scm_options (setting,
	61	scm_readline_opts,
	62	SCM_N_READLINE_OPTIONS,
f48e47b9	63	FUNC_NAME);
c374ab69 MV	64	stifle_history (SCM_HISTORY_LENGTH);
	65	return ans;
	66	}
f48e47b9	67	#undef FUNC_NAME
c374ab69 MV	68
	69	#ifndef HAVE_STRDUP
	70	static char *
	71	strdup (char *s)
	72	{
	73	int len = strlen (s);
	74	char *new = malloc (len + 1);
	75	strcpy (new, s);
	76	return new;
	77	}
	78	#endif /* HAVE_STRDUP */
	79
	80	#ifndef HAVE_RL_CLEANUP_AFTER_SIGNAL
	81
	82	/* These are readline functions added in release 2.3. They will work
	83	* together with readline-2.1 and 2.2. (The readline interface is
	84	* disabled for earlier releases.)
	85	* They are declared static; if we want to use them elsewhere, then
	86	* we need external declarations for them, but at the moment, I don't
	87	* think anything else in Guile ought to use these.
	88	*/
	89
	90	extern void _rl_clean_up_for_exit ();
	91	extern void _rl_kill_kbd_macro ();
	92	extern int _rl_init_argument ();
	93
2e3d5987	94	void
c374ab69 MV	95	rl_cleanup_after_signal ()
	96	{
	97	#ifdef HAVE_RL_CLEAR_SIGNALS
	98	_rl_clean_up_for_exit ();
	99	#endif
	100	(*rl_deprep_term_function) ();
	101	#ifdef HAVE_RL_CLEAR_SIGNALS
	102	rl_clear_signals ();
	103	#endif
	104	rl_pending_input = 0;
	105	}
	106
2e3d5987	107	void
c374ab69 MV	108	rl_free_line_state ()
	109	{
	110	register HIST_ENTRY *entry;
	111
	112	free_undo_list ();
	113
	114	entry = current_history ();
	115	if (entry)
	116	entry->data = (char *)NULL;
	117
	118	_rl_kill_kbd_macro ();
	119	rl_clear_message ();
	120	_rl_init_argument ();
	121	}
	122
	123	#endif /* !HAVE_RL_CLEANUP_AFTER_SIGNAL */
	124
	125	static int promptp;
	126	static SCM input_port;
	127	static SCM before_read;
	128
	129	static int
	130	current_input_getc (FILE *in)
	131	{
c374ab69 MV	132	if (promptp && SCM_NIMP (before_read))
	133	{
	134	scm_apply (before_read, SCM_EOL, SCM_EOL);
	135	promptp = 0;
	136	}
bc858b80	137	return scm_getc (input_port);
c374ab69 MV	138	}
	139
	140	static void
	141	redisplay ()
	142	{
	143	rl_redisplay ();
	144	/* promptp = 1; */
	145	}
	146
c374ab69 MV	147	static int in_readline = 0;
	148	#ifdef USE_THREADS
	149	static scm_mutex_t reentry_barrier_mutex;
	150	#endif
	151
f48e47b9 GB	152	static SCM internal_readline (SCM text);
f48e47b9 GB	153	static SCM handle_error (void *data, SCM tag, SCM args);
48552b1d	154	static void reentry_barrier (void);
f48e47b9 GB	155
f48e47b9 GB	156
b916d813	157	SCM_DEFINE (scm_readline, "%readline", 0, 4, 0,
f48e47b9 GB	158	(SCM text, SCM inp, SCM outp, SCM read_hook),
	159	"")
	160	#define FUNC_NAME s_scm_readline
	161	{
	162	SCM ans;
	163
	164	reentry_barrier ();
	165
	166	before_read = SCM_BOOL_F;
	167
	168	if (!SCM_UNBNDP (text))
	169	{
	170	if (!(SCM_NIMP (text) && SCM_STRINGP (text)))
	171	{
	172	--in_readline;
	173	scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	174	}
08b5e6c3	175	SCM_STRING_COERCE_0TERMINATION_X (text);
f48e47b9 GB	176	}
	177
	178	if (!((SCM_UNBNDP (inp) && SCM_NIMP (scm_cur_inp) && SCM_OPINFPORTP (inp))
48552b1d	179	\|\| (SCM_NIMP (inp) && SCM_OPINFPORTP (inp))))
f48e47b9 GB	180	{
	181	--in_readline;
	182	scm_misc_error (s_scm_readline,
	183	"Input port is not open or not a file port",
	184	SCM_EOL);
	185	}
	186
	187	if (!((SCM_UNBNDP (outp) && SCM_NIMP (scm_cur_outp) && SCM_OPINFPORTP (outp))
	188	\|\| (SCM_NIMP (outp) && SCM_OPOUTFPORTP (outp))))
	189	{
	190	--in_readline;
	191	scm_misc_error (s_scm_readline,
	192	"Output port is not open or not a file port",
	193	SCM_EOL);
	194	}
	195
	196	if (!(SCM_UNBNDP (read_hook) \|\| SCM_FALSEP (read_hook)))
	197	{
	198	if (!(SCM_NFALSEP (scm_thunk_p (read_hook))))
	199	{
	200	--in_readline;
	201	scm_wrong_type_arg (s_scm_readline, SCM_ARG4, read_hook);
	202	}
	203	before_read = read_hook;
	204	}
	205
	206	scm_readline_init_ports (inp, outp);
	207
	208	ans = scm_internal_catch (SCM_BOOL_T,
	209	(scm_catch_body_t) internal_readline,
f60d011a	210	(void *) SCM_UNPACK (text),
f48e47b9 GB	211	handle_error, 0);
	212
	213	fclose (rl_instream);
	214	fclose (rl_outstream);
	215
	216	--in_readline;
	217	return ans;
	218	}
	219	#undef FUNC_NAME
	220
	221
c374ab69 MV	222	static void
	223	reentry_barrier ()
	224	{
	225	int reentryp = 0;
	226	#ifdef USE_THREADS
	227	/* We should rather use scm_mutex_try_lock when it becomes available */
	228	scm_mutex_lock (&reentry_barrier_mutex);
	229	#endif
	230	if (in_readline)
	231	reentryp = 1;
	232	else
	233	++in_readline;
	234	#ifdef USE_THREADS
	235	scm_mutex_unlock (&reentry_barrier_mutex);
	236	#endif
	237	if (reentryp)
f48e47b9	238	scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL);
c374ab69 MV	239	}
	240
	241	static SCM
	242	handle_error (void *data, SCM tag, SCM args)
	243	{
	244	rl_free_line_state ();
	245	rl_cleanup_after_signal ();
739b3bf1	246	fputc ('\n', rl_outstream); /* We don't want next output on this line */
c374ab69 MV	247	fclose (rl_instream);
	248	fclose (rl_outstream);
	249	--in_readline;
	250	scm_handle_by_throw (data, tag, args);
	251	return SCM_UNSPECIFIED; /* never reached */
	252	}
	253
	254	static SCM
	255	internal_readline (SCM text)
	256	{
	257	SCM ret;
	258	char *s;
08b5e6c3	259	char *prompt = SCM_UNBNDP (text) ? "" : SCM_STRING_CHARS (text);
c374ab69 MV	260
	261	promptp = 1;
	262	s = readline (prompt);
	263	if (s)
	264	ret = scm_makfrom0str (s);
	265	else
	266	ret = SCM_EOF_VAL;
	267
	268	free (s);
	269
	270	return ret;
	271	}
	272
	273	static FILE *
	274	stream_from_fport (SCM port, char mode, const char subr)
	275	{
	276	int fd;
	277	FILE *f;
	278
	279	fd = dup (((struct scm_fport *) SCM_STREAM (port))->fdes);
	280	if (fd == -1)
	281	{
	282	--in_readline;
	283	scm_syserror (subr);
	284	}
	285
	286	f = fdopen (fd, mode);
	287	if (f == NULL)
	288	{
	289	--in_readline;
	290	scm_syserror (subr);
	291	}
	292
	293	return f;
	294	}
	295
2e3d5987 MD	296	void
	297	scm_readline_init_ports (SCM inp, SCM outp)
	298	{
	299	if (SCM_UNBNDP (inp))
	300	inp = scm_cur_inp;
	301
	302	if (SCM_UNBNDP (outp))
	303	outp = scm_cur_outp;
	304
	305	if (!(SCM_NIMP (inp) && SCM_OPINFPORTP (inp))) {
	306	scm_misc_error (0,
	307	"Input port is not open or not a file port",
	308	SCM_EOL);
	309	}
	310
	311	if (!(SCM_NIMP (outp) && SCM_OPOUTFPORTP (outp))) {
	312	scm_misc_error (0,
	313	"Output port is not open or not a file port",
	314	SCM_EOL);
	315	}
	316
	317	input_port = inp;
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);
2e3d5987 MD	320	}
2e3d5987 MD	321
c374ab69	322
c374ab69	323
b916d813	324	SCM_DEFINE (scm_add_history, "add-history", 1, 0, 0,
f48e47b9 GB	325	(SCM text),
	326	"")
	327	#define FUNC_NAME s_scm_add_history
c374ab69 MV	328	{
c374ab69 MV	329	char* s;
cbaee92a	330	SCM_VALIDATE_STRING (1,text);
08b5e6c3	331	SCM_STRING_COERCE_0TERMINATION_X (text);
c374ab69	332
08b5e6c3	333	s = SCM_STRING_CHARS (text);
c374ab69 MV	334	add_history (strdup (s));
	335
	336	return SCM_UNSPECIFIED;
	337	}
f48e47b9	338	#undef FUNC_NAME
c374ab69 MV	339
c374ab69 MV	340
b916d813	341	SCM_DEFINE (scm_read_history, "read-history", 1, 0, 0,
f48e47b9 GB	342	(SCM file),
	343	"")
	344	#define FUNC_NAME s_scm_read_history
c374ab69	345	{
cbaee92a	346	SCM_VALIDATE_STRING (1,file);
08b5e6c3	347	return SCM_NEGATE_BOOL (read_history (SCM_STRING_CHARS (file)));
c374ab69	348	}
f48e47b9	349	#undef FUNC_NAME
c374ab69 MV	350
c374ab69 MV	351
b916d813	352	SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0,
f48e47b9 GB	353	(SCM file),
	354	"")
	355	#define FUNC_NAME s_scm_write_history
c374ab69	356	{
cbaee92a	357	SCM_VALIDATE_STRING (1,file);
08b5e6c3	358	return SCM_NEGATE_BOOL (write_history (SCM_STRING_CHARS (file)));
c374ab69	359	}
f48e47b9	360	#undef FUNC_NAME
c374ab69 MV	361
c374ab69 MV	362
b916d813	363	SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0,
f48e47b9 GB	364	(SCM text, SCM continuep),
	365	"")
	366	#define FUNC_NAME s_scm_filename_completion_function
c374ab69 MV	367	{
	368	char *s;
	369	SCM ans;
cbaee92a	370	SCM_VALIDATE_STRING (1,text);
08b5e6c3 DH	371	SCM_STRING_COERCE_0TERMINATION_X (text);
08b5e6c3 DH	372	s = filename_completion_function (SCM_STRING_CHARS (text), SCM_NFALSEP (continuep));
c374ab69 MV	373	ans = scm_makfrom0str (s);
	374	free (s);
	375	return ans;
	376	}
f48e47b9	377	#undef FUNC_NAME
c374ab69 MV	378
	379	/*
	380	* The following has been modified from code contributed by
	381	* Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>
	382	*/
	383
	384	SCM scm_readline_completion_function_var;
	385
	386	static char *
	387	completion_function (char *text, int continuep)
	388	{
	389	SCM compfunc = SCM_CDR (scm_readline_completion_function_var);
	390	SCM res;
	391
	392	if (SCM_FALSEP (compfunc))
	393	return NULL; /* #f => completion disabled */
	394	else
	395	{
	396	SCM t = scm_makfrom0str (text);
	397	SCM c = continuep ? SCM_BOOL_T : SCM_BOOL_F;
	398	res = scm_apply (compfunc, SCM_LIST2 (t, c), SCM_EOL);
	399
	400	if (SCM_FALSEP (res))
	401	return NULL;
	402
	403	if (!(SCM_NIMP (res) && SCM_STRINGP (res)))
f48e47b9	404	scm_misc_error (s_scm_readline,
c374ab69 MV	405	"Completion function returned bogus value: %S",
c374ab69 MV	406	SCM_LIST1 (res));
08b5e6c3 DH	407	SCM_STRING_COERCE_0TERMINATION_X (res);
08b5e6c3 DH	408	return strdup (SCM_STRING_CHARS (res));
c374ab69 MV	409	}
	410	}
	411
	412	/Bouncing parenthesis (reimplemented by GH, 11/23/98, since readline is strict gpl)/
	413
576cdec4 MD	414	static int match_paren (int x, int k);
	415	static int find_matching_paren (int k);
	416	static void init_bouncing_parens ();
c374ab69 MV	417
c374ab69 MV	418	static void
576cdec4	419	init_bouncing_parens ()
c374ab69	420	{
576cdec4 MD	421	if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
	422	{
	423	rl_bind_key (')', match_paren);
	424	rl_bind_key (']', match_paren);
	425	rl_bind_key ('}', match_paren);
	426	}
c374ab69 MV	427	}
	428
	429	static int
	430	find_matching_paren(int k)
	431	{
	432	register int i;
	433	register char c = 0;
	434	int end_parens_found = 0;
	435
	436	/* Choose the corresponding opening bracket. */
	437	if (k == ')') c = '(';
	438	else if (k == ']') c = '[';
	439	else if (k == '}') c = '{';
	440
	441	for (i=rl_point-2; i>=0; i--)
	442	{
	443	/* Is the current character part of a character literal? */
	444	if (i - 2 >= 0
	445	&& rl_line_buffer[i - 1] == '\\'
	446	&& rl_line_buffer[i - 2] == '#')
	447	;
	448	else if (rl_line_buffer[i] == k)
	449	end_parens_found++;
	450	else if (rl_line_buffer[i] == '"')
	451	{
	452	/* Skip over a string literal. */
	453	for (i--; i >= 0; i--)
	454	if (rl_line_buffer[i] == '"'
	455	&& ! (i - 1 >= 0
	456	&& rl_line_buffer[i - 1] == '\\'))
	457	break;
	458	}
	459	else if (rl_line_buffer[i] == c)
	460	{
576cdec4 MD	461	if (end_parens_found==0)
576cdec4 MD	462	return i;
c374ab69 MV	463	else --end_parens_found;
	464	}
	465	}
	466	return -1;
	467	}
	468
576cdec4 MD	469	static int
576cdec4 MD	470	match_paren (int x, int k)
c374ab69	471	{
bc858b80	472	int tmp, fno;
aba2031a	473	SELECT_TYPE readset;
c374ab69 MV	474	struct timeval timeout;
c374ab69 MV	475
576cdec4	476	rl_insert (x, k);
c374ab69	477	if (!SCM_READLINE_BOUNCE_PARENS)
576cdec4	478	return 0;
c374ab69 MV	479
	480	/* Did we just insert a quoted paren? If so, then don't bounce. */
	481	if (rl_point - 1 >= 1
	482	&& rl_line_buffer[rl_point - 2] == '\\')
576cdec4	483	return 0;
c374ab69 MV	484
	485	tmp = 1000 * SCM_READLINE_BOUNCE_PARENS;
	486	timeout.tv_sec = tmp / 1000000;
	487	timeout.tv_usec = tmp % 1000000;
576cdec4	488	FD_ZERO (&readset);
bc858b80 MD	489	fno = fileno (rl_instream);
bc858b80 MD	490	FD_SET (fno, &readset);
c374ab69	491
576cdec4 MD	492	if (rl_point > 1)
	493	{
	494	tmp = rl_point;
	495	rl_point = find_matching_paren (k);
	496	if (rl_point > -1)
	497	{
	498	rl_redisplay ();
bc858b80	499	scm_internal_select (fno + 1, &readset, NULL, NULL, &timeout);
576cdec4 MD	500	}
576cdec4 MD	501	rl_point = tmp;
c374ab69	502	}
576cdec4	503	return 0;
c374ab69 MV	504	}
c374ab69 MV	505
b71099ba MD	506	#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
	507	/* Readline disables SA_RESTART on SIGWINCH.
	508	* This code turns it back on.
	509	*/
	510	static int
	511	sigwinch_enable_restart (void)
	512	{
	513	#ifdef HAVE_SIGINTERRUPT
	514	siginterrupt (SIGWINCH, 0);
	515	#else
	516	struct sigaction action;
	517
	518	sigaction (SIGWINCH, NULL, &action);
	519	action.sa_flags \|= SA_RESTART;
	520	sigaction (SIGWINCH, &action, NULL);
	521	#endif
	522	return 0;
	523	}
	524	#endif
	525
26047451 MD	526	#endif /* HAVE_RL_GETC_FUNCTION */
26047451 MD	527
c374ab69 MV	528	void
	529	scm_init_readline ()
	530	{
62947883	531	#ifdef HAVE_RL_GETC_FUNCTION
a0599745	532	#include "guile-readline/readline.x"
c374ab69 MV	533	scm_readline_completion_function_var
	534	= scm_sysintern ("readline-completion-function", SCM_BOOL_F);
	535	rl_getc_function = current_input_getc;
	536	rl_redisplay_function = redisplay;
	537	rl_completion_entry_function = (Function*) completion_function;
	538	rl_basic_word_break_characters = "\t\n\"'`;()";
5c11cc9d	539	rl_readline_name = "Guile";
b71099ba MD	540	#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
	541	rl_pre_input_hook = sigwinch_enable_restart;
	542	#endif
5c11cc9d	543
c374ab69	544	#ifdef USE_THREADS
b74b1a63	545	scm_mutex_init (&reentry_barrier_mutex);
c374ab69 MV	546	#endif
	547	scm_init_opts (scm_readline_options,
	548	scm_readline_opts,
	549	SCM_N_READLINE_OPTIONS);
	550	init_bouncing_parens();
	551	scm_add_feature ("readline");
62947883	552	#endif /* HAVE_RL_GETC_FUNCTION */
c374ab69 MV	553	}
c374ab69 MV	554
89e00824 ML	555	/*
	556	Local Variables:
	557	c-file-style: "gnu"
	558	End:
	559	*/