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

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

/* Copyright (C) 1997,1999,2000,2001 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
 *
 */


\f

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

#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <readline/readline.h>
#include <readline/history.h>
#include <sys/time.h>
#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_FALSEP (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_t_mutex 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_STRINGP (text))
	{
	  --in_readline;
	  scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	}
    }
  
  if (!((SCM_UNBNDP (inp) && SCM_OPINFPORTP (scm_cur_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_OPINFPORTP (scm_cur_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_t_catch_body) 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_t_mutexry_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_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_cur_inp;
  
  if (SCM_UNBNDP (outp))
    outp = scm_cur_outp;
  
  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;
  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);

  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_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;
  SCM_VALIDATE_STRING (1,text);
#ifdef HAVE_RL_FILENAME_COMPLETION_FUNCTION
  s = rl_filename_completion_function (SCM_STRING_CHARS (text), SCM_NFALSEP (continuep));
#else
  s = filename_completion_function (SCM_STRING_CHARS (text), SCM_NFALSEP (continuep));
#endif
  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_VARIABLE_REF (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_list_2 (t, c), SCM_EOL);
  
      if (SCM_FALSEP (res))
	return NULL;
  
      if (!SCM_STRINGP (res))
	scm_misc_error (s_scm_readline,
			"Completion function returned bogus value: %S",
			scm_list_1 (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_c_define ("*readline-completion-function*", SCM_BOOL_F);
  rl_getc_function = current_input_getc;
  rl_redisplay_function = redisplay;
#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

#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
e81d98ec	3	/* Copyright (C) 1997,1999,2000,2001 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	21
f48e47b9	22
c374ab69 MV	23	\f
c374ab69 MV	24
739b3bf1	25	#include "libguile/_scm.h"
62947883	26	#ifdef HAVE_RL_GETC_FUNCTION
fbf68f8b	27	#include "libguile.h"
739b3bf1 MD	28	#include "libguile/gh.h"
	29	#include "libguile/iselect.h"
	30
ffdeebc3	31	#include <stdio.h>
48552b1d MD	32	#ifdef HAVE_UNISTD_H
	33	#include <unistd.h>
	34	#endif
c374ab69 MV	35	#include <readline/readline.h>
c374ab69 MV	36	#include <readline/history.h>
c374ab69	37	#include <sys/time.h>
b71099ba	38	#include <signal.h>
c374ab69	39
1c537018	40	#include "libguile/validate.h"
a0599745	41	#include "guile-readline/readline.h"
c374ab69	42
593be5d2	43	scm_t_option scm_readline_opts[] = {
c374ab69 MV	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	{
1be6b49c	72	size_t len = strlen (s);
c374ab69 MV	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
e81d98ec	129	current_input_getc (FILE *in SCM_UNUSED)
c374ab69	130	{
379b35da	131	if (promptp && !SCM_FALSEP (before_read))
c374ab69 MV	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;
c374ab69 MV	147	#ifdef USE_THREADS
593be5d2	148	static scm_t_mutex reentry_barrier_mutex;
c374ab69 MV	149	#endif
c374ab69 MV	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	{
379b35da	169	if (!SCM_STRINGP (text))
f48e47b9 GB	170	{
	171	--in_readline;
	172	scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	173	}
f48e47b9 GB	174	}
f48e47b9 GB	175
379b35da DH	176	if (!((SCM_UNBNDP (inp) && SCM_OPINFPORTP (scm_cur_inp))
379b35da DH	177	\|\| SCM_OPINFPORTP (inp)))
f48e47b9 GB	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
379b35da DH	185	if (!((SCM_UNBNDP (outp) && SCM_OPINFPORTP (scm_cur_outp))
379b35da DH	186	\|\| SCM_OPOUTFPORTP (outp)))
f48e47b9 GB	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,
593be5d2	207	(scm_t_catch_body) internal_readline,
f60d011a	208	(void *) SCM_UNPACK (text),
f48e47b9 GB	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
593be5d2	225	/* We should rather use scm_t_mutexry_lock when it becomes available */
c374ab69 MV	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;
08b5e6c3	257	char *prompt = SCM_UNBNDP (text) ? "" : SCM_STRING_CHARS (text);
c374ab69 MV	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
593be5d2	277	fd = dup (((struct scm_t_fport *) SCM_STREAM (port))->fdes);
c374ab69 MV	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
379b35da	303	if (!SCM_OPINFPORTP (inp)) {
2e3d5987 MD	304	scm_misc_error (0,
	305	"Input port is not open or not a file port",
	306	SCM_EOL);
	307	}
	308
379b35da	309	if (!SCM_OPOUTFPORTP (outp)) {
2e3d5987 MD	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	329
08b5e6c3	330	s = SCM_STRING_CHARS (text);
c374ab69 MV	331	add_history (strdup (s));
	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	{
cbaee92a	343	SCM_VALIDATE_STRING (1,file);
08b5e6c3	344	return SCM_NEGATE_BOOL (read_history (SCM_STRING_CHARS (file)));
c374ab69	345	}
f48e47b9	346	#undef FUNC_NAME
c374ab69 MV	347
c374ab69 MV	348
b916d813	349	SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0,
f48e47b9 GB	350	(SCM file),
	351	"")
	352	#define FUNC_NAME s_scm_write_history
c374ab69	353	{
cbaee92a	354	SCM_VALIDATE_STRING (1,file);
08b5e6c3	355	return SCM_NEGATE_BOOL (write_history (SCM_STRING_CHARS (file)));
c374ab69	356	}
f48e47b9	357	#undef FUNC_NAME
c374ab69	358
8ed35a15 MV	359	SCM_DEFINE (scm_clear_history, "clear-history", 0, 0, 0,
	360	(),
	361	"Clear the history buffer of the readline machinery.")
	362	#define FUNC_NAME s_scm_clear_history
	363	{
	364	clear_history();
	365	return SCM_UNSPECIFIED;
	366	}
	367	#undef FUNC_NAME
	368
c374ab69	369
b916d813	370	SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0,
f48e47b9 GB	371	(SCM text, SCM continuep),
	372	"")
	373	#define FUNC_NAME s_scm_filename_completion_function
c374ab69 MV	374	{
	375	char *s;
	376	SCM ans;
cbaee92a	377	SCM_VALIDATE_STRING (1,text);
dcb17187 MV	378	#ifdef HAVE_RL_FILENAME_COMPLETION_FUNCTION
	379	s = rl_filename_completion_function (SCM_STRING_CHARS (text), SCM_NFALSEP (continuep));
	380	#else
08b5e6c3	381	s = filename_completion_function (SCM_STRING_CHARS (text), SCM_NFALSEP (continuep));
dcb17187	382	#endif
c374ab69 MV	383	ans = scm_makfrom0str (s);
	384	free (s);
	385	return ans;
	386	}
f48e47b9	387	#undef FUNC_NAME
c374ab69 MV	388
	389	/*
	390	* The following has been modified from code contributed by
	391	* Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>
	392	*/
	393
	394	SCM scm_readline_completion_function_var;
	395
	396	static char *
	397	completion_function (char *text, int continuep)
	398	{
296ff5e7	399	SCM compfunc = SCM_VARIABLE_REF (scm_readline_completion_function_var);
c374ab69 MV	400	SCM res;
	401
	402	if (SCM_FALSEP (compfunc))
	403	return NULL; /* #f => completion disabled */
	404	else
	405	{
	406	SCM t = scm_makfrom0str (text);
	407	SCM c = continuep ? SCM_BOOL_T : SCM_BOOL_F;
5b2a7b59	408	res = scm_apply (compfunc, scm_list_2 (t, c), SCM_EOL);
c374ab69 MV	409
	410	if (SCM_FALSEP (res))
	411	return NULL;
	412
379b35da	413	if (!SCM_STRINGP (res))
f48e47b9	414	scm_misc_error (s_scm_readline,
c374ab69	415	"Completion function returned bogus value: %S",
5b2a7b59	416	scm_list_1 (res));
08b5e6c3	417	return strdup (SCM_STRING_CHARS (res));
c374ab69 MV	418	}
	419	}
	420
	421	/Bouncing parenthesis (reimplemented by GH, 11/23/98, since readline is strict gpl)/
	422
576cdec4 MD	423	static int match_paren (int x, int k);
	424	static int find_matching_paren (int k);
	425	static void init_bouncing_parens ();
c374ab69 MV	426
c374ab69 MV	427	static void
576cdec4	428	init_bouncing_parens ()
c374ab69	429	{
576cdec4 MD	430	if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
	431	{
	432	rl_bind_key (')', match_paren);
	433	rl_bind_key (']', match_paren);
	434	rl_bind_key ('}', match_paren);
	435	}
c374ab69 MV	436	}
	437
	438	static int
	439	find_matching_paren(int k)
	440	{
	441	register int i;
	442	register char c = 0;
	443	int end_parens_found = 0;
	444
	445	/* Choose the corresponding opening bracket. */
	446	if (k == ')') c = '(';
	447	else if (k == ']') c = '[';
	448	else if (k == '}') c = '{';
	449
	450	for (i=rl_point-2; i>=0; i--)
	451	{
	452	/* Is the current character part of a character literal? */
	453	if (i - 2 >= 0
	454	&& rl_line_buffer[i - 1] == '\\'
	455	&& rl_line_buffer[i - 2] == '#')
	456	;
	457	else if (rl_line_buffer[i] == k)
	458	end_parens_found++;
	459	else if (rl_line_buffer[i] == '"')
	460	{
	461	/* Skip over a string literal. */
	462	for (i--; i >= 0; i--)
	463	if (rl_line_buffer[i] == '"'
	464	&& ! (i - 1 >= 0
	465	&& rl_line_buffer[i - 1] == '\\'))
	466	break;
	467	}
	468	else if (rl_line_buffer[i] == c)
	469	{
576cdec4 MD	470	if (end_parens_found==0)
576cdec4 MD	471	return i;
c374ab69 MV	472	else --end_parens_found;
	473	}
	474	}
	475	return -1;
	476	}
	477
576cdec4 MD	478	static int
576cdec4 MD	479	match_paren (int x, int k)
c374ab69	480	{
bc858b80	481	int tmp, fno;
aba2031a	482	SELECT_TYPE readset;
c374ab69 MV	483	struct timeval timeout;
c374ab69 MV	484
576cdec4	485	rl_insert (x, k);
c374ab69	486	if (!SCM_READLINE_BOUNCE_PARENS)
576cdec4	487	return 0;
c374ab69 MV	488
	489	/* Did we just insert a quoted paren? If so, then don't bounce. */
	490	if (rl_point - 1 >= 1
	491	&& rl_line_buffer[rl_point - 2] == '\\')
576cdec4	492	return 0;
c374ab69 MV	493
	494	tmp = 1000 * SCM_READLINE_BOUNCE_PARENS;
	495	timeout.tv_sec = tmp / 1000000;
	496	timeout.tv_usec = tmp % 1000000;
576cdec4	497	FD_ZERO (&readset);
bc858b80 MD	498	fno = fileno (rl_instream);
bc858b80 MD	499	FD_SET (fno, &readset);
c374ab69	500
576cdec4 MD	501	if (rl_point > 1)
	502	{
	503	tmp = rl_point;
	504	rl_point = find_matching_paren (k);
	505	if (rl_point > -1)
	506	{
	507	rl_redisplay ();
bc858b80	508	scm_internal_select (fno + 1, &readset, NULL, NULL, &timeout);
576cdec4 MD	509	}
576cdec4 MD	510	rl_point = tmp;
c374ab69	511	}
576cdec4	512	return 0;
c374ab69 MV	513	}
c374ab69 MV	514
b71099ba MD	515	#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
	516	/* Readline disables SA_RESTART on SIGWINCH.
	517	* This code turns it back on.
	518	*/
	519	static int
	520	sigwinch_enable_restart (void)
	521	{
	522	#ifdef HAVE_SIGINTERRUPT
	523	siginterrupt (SIGWINCH, 0);
	524	#else
	525	struct sigaction action;
	526
	527	sigaction (SIGWINCH, NULL, &action);
	528	action.sa_flags \|= SA_RESTART;
	529	sigaction (SIGWINCH, &action, NULL);
	530	#endif
	531	return 0;
	532	}
	533	#endif
	534
26047451 MD	535	#endif /* HAVE_RL_GETC_FUNCTION */
26047451 MD	536
c374ab69 MV	537	void
	538	scm_init_readline ()
	539	{
62947883	540	#ifdef HAVE_RL_GETC_FUNCTION
a0599745	541	#include "guile-readline/readline.x"
c374ab69	542	scm_readline_completion_function_var
296ff5e7	543	= scm_c_define ("readline-completion-function", SCM_BOOL_F);
c374ab69 MV	544	rl_getc_function = current_input_getc;
c374ab69 MV	545	rl_redisplay_function = redisplay;
dcb17187 MV	546	#if defined (_RL_FUNCTION_TYPEDEF)
	547	rl_completion_entry_function = (rl_compentry_func_t*) completion_function;
	548	#else
c374ab69	549	rl_completion_entry_function = (Function*) completion_function;
dcb17187	550	#endif
c374ab69	551	rl_basic_word_break_characters = "\t\n\"'`;()";
5c11cc9d	552	rl_readline_name = "Guile";
b71099ba MD	553	#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
	554	rl_pre_input_hook = sigwinch_enable_restart;
	555	#endif
5c11cc9d	556
c374ab69	557	#ifdef USE_THREADS
b74b1a63	558	scm_mutex_init (&reentry_barrier_mutex);
c374ab69 MV	559	#endif
	560	scm_init_opts (scm_readline_options,
	561	scm_readline_opts,
	562	SCM_N_READLINE_OPTIONS);
	563	init_bouncing_parens();
	564	scm_add_feature ("readline");
62947883	565	#endif /* HAVE_RL_GETC_FUNCTION */
c374ab69 MV	566	}
c374ab69 MV	567
89e00824 ML	568	/*
	569	Local Variables:
	570	c-file-style: "gnu"
	571	End:
	572	*/