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

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

/* Copyright (C) 1997,1999,2000,2001, 2002, 2003, 2006, 2007, 2008, 2009, 2010, 2013 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 3, or (at your option)
 * any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this software; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA
 *
 */


\f
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

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

#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <readline/readline.h>
#include <readline/history.h>
#ifndef __MINGW32__
#include <sys/time.h>
#else
#include <io.h>
#endif
#include <signal.h>

#include "libguile/validate.h"
#include "guile-readline/readline.h"

scm_t_option scm_readline_opts[] = {
  { SCM_OPTION_BOOLEAN, "history-file", 1,
    "Use history file." },
  { SCM_OPTION_INTEGER, "history-length", 200,
    "History length." },
  { SCM_OPTION_INTEGER, "bounce-parens", 500,
    "Time (ms) to show matching opening parenthesis (0 = off)."},
  { 0 }
};

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,
			 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 output_port;
static SCM before_read;

static int
current_input_getc (FILE *in SCM_UNUSED)
{
  if (promptp && scm_is_true (before_read))
    {
      scm_apply (before_read, SCM_EOL, SCM_EOL);
      promptp = 0;
    }
  return scm_get_byte_or_eof (input_port);
}

static int in_readline = 0;
static SCM reentry_barrier_mutex;

static SCM internal_readline (SCM text);
static void unwind_readline (void *unused);
static void reentry_barrier (void);


SCM_DEFINE (scm_readline, "%readline", 0, 4, 0, 
            (SCM text, SCM inp, SCM outp, SCM read_hook),
"")
#define FUNC_NAME s_scm_readline
{
  SCM ans;
  
  reentry_barrier ();
  
  before_read = SCM_BOOL_F;

  if (!SCM_UNBNDP (text))
    {
      if (!scm_is_string (text))
	{
	  --in_readline;
	  scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	}
    }
  
  if (!((SCM_UNBNDP (inp) && SCM_OPINFPORTP (scm_current_input_port ()))
	|| SCM_OPINFPORTP (inp)))
    {
      --in_readline;
      scm_misc_error (s_scm_readline,
		      "Input port is not open or not a file port",
		      SCM_EOL);
    }
  
  if (!((SCM_UNBNDP (outp) && SCM_OPOUTFPORTP (scm_current_output_port ()))
	|| SCM_OPOUTFPORTP (outp)))
    {
      --in_readline;
      scm_misc_error (s_scm_readline,
		      "Output port is not open or not a file port",
		      SCM_EOL);
    }

  if (!(SCM_UNBNDP (read_hook) || scm_is_false (read_hook)))
    {
      if (scm_is_false (scm_thunk_p (read_hook)))
	{
	  --in_readline;
	  scm_wrong_type_arg (s_scm_readline, SCM_ARG4, read_hook);
	}
      before_read = read_hook;
    }

  scm_readline_init_ports (inp, outp);

  scm_dynwind_begin (0);
  scm_dynwind_unwind_handler (unwind_readline, NULL, 0);
  
  ans = internal_readline (text);

  scm_dynwind_end ();

#ifndef __MINGW32__
  fclose (rl_instream);
  fclose (rl_outstream);
#endif

  --in_readline;
  return ans;
}
#undef FUNC_NAME


static void
reentry_barrier ()
{
  int reentryp = 0;
  /* We should rather use scm_try_mutex when it becomes available */
  scm_lock_mutex (reentry_barrier_mutex);
  if (in_readline)
    reentryp = 1;
  else
    ++in_readline;
  scm_unlock_mutex (reentry_barrier_mutex);
  if (reentryp)
    scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL);
}

/* This function is only called on nonlocal exit from readline(). */
static void
unwind_readline (void *unused)
{
  rl_free_line_state ();
  rl_cleanup_after_signal ();
  fputc ('\n', rl_outstream); /* We don't want next output on this line */
#ifndef __MINGW32__
  fclose (rl_instream);
  fclose (rl_outstream);
#endif
  --in_readline;
}

static SCM
internal_readline (SCM text)
{
  SCM ret;
  char *s;
  char *prompt = SCM_UNBNDP (text) ? "" : scm_to_locale_string (text);

  promptp = 1;
  s = readline (prompt);
  if (s)
    ret = scm_from_port_string (s, output_port);
  else 
    ret = SCM_EOF_VAL;

  if (!SCM_UNBNDP (text))
    free (prompt);
  free (s);

  return ret;
}

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

  fd = dup (((struct scm_t_fport *) SCM_STREAM (port))->fdes);
  if (fd == -1)
    {
      --in_readline;
      scm_syserror (subr);
    }

  f = fdopen (fd, mode);
  if (f == NULL)
    {
      --in_readline;
      scm_syserror (subr);
    }

  return f;
}

void
scm_readline_init_ports (SCM inp, SCM outp)
{
  if (SCM_UNBNDP (inp))
    inp = scm_current_input_port ();
  
  if (SCM_UNBNDP (outp))
    outp = scm_current_output_port ();
  
  if (!SCM_OPINFPORTP (inp)) {
    scm_misc_error (0,
                    "Input port is not open or not a file port",
                    SCM_EOL);
  }

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

  input_port = inp;
  output_port = outp;
#ifndef __MINGW32__
  rl_instream = stream_from_fport (inp, "r", s_scm_readline);
  rl_outstream = stream_from_fport (outp, "w", s_scm_readline);
#endif
}


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

  s = scm_to_locale_string (text);
  add_history (s);
  free (s);

  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME


SCM_DEFINE (scm_read_history, "read-history", 1, 0, 0, 
            (SCM file),
"")
#define FUNC_NAME s_scm_read_history
{
  char *filename;
  SCM ret;

  filename = scm_to_locale_string (file);
  ret = scm_from_bool (!read_history (filename));
  free (filename);
  return ret;
}
#undef FUNC_NAME


SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0, 
            (SCM file),
"")
#define FUNC_NAME s_scm_write_history
{
  char *filename;
  SCM ret;

  filename = scm_to_locale_string (file);
  ret = scm_from_bool (!write_history (filename));
  free (filename);
  return ret;
}
#undef FUNC_NAME

SCM_DEFINE (scm_clear_history, "clear-history", 0, 0, 0, 
            (),
	    "Clear the history buffer of the readline machinery.")
#define FUNC_NAME s_scm_clear_history
{
  clear_history();
  return SCM_UNSPECIFIED;
}
#undef FUNC_NAME


SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0, 
            (SCM text, SCM continuep),
"")
#define FUNC_NAME s_scm_filename_completion_function
{
  char *s;
  SCM ans;
  char *c_text = scm_to_locale_string (text);
#ifdef HAVE_RL_FILENAME_COMPLETION_FUNCTION
  s = rl_filename_completion_function (c_text, scm_is_true (continuep));
#else
  s = filename_completion_function (c_text, scm_is_true (continuep));
#endif
  ans = scm_take_locale_string (s);
  free (c_text);
  return ans;
}
#undef FUNC_NAME

/*
 * The following has been modified from code contributed by
 * Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>
 */

SCM scm_readline_completion_function_var;

static char *
completion_function (char *text, int continuep)
{
  SCM compfunc = SCM_VARIABLE_REF (scm_readline_completion_function_var);
  SCM res;

  if (scm_is_false (compfunc))
    return NULL; /* #f => completion disabled */
  else
    {
      SCM t = scm_from_locale_string (text);
      SCM c = scm_from_bool (continuep);
      res = scm_apply (compfunc, scm_list_2 (t, c), SCM_EOL);
  
      if (scm_is_false (res))
	return NULL;
  
      return scm_to_locale_string (res);
    }
}

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

static int match_paren (int x, int k);
static int find_matching_paren (int k);
static void init_bouncing_parens ();

static void
init_bouncing_parens ()
{
  if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
    {
      rl_bind_key (')', match_paren);
      rl_bind_key (']', match_paren);
      rl_bind_key ('}', match_paren);
    }
}

static int
find_matching_paren(int k)
{
  register int i;
  register char c = 0;
  int end_parens_found = 0;

  /* Choose the corresponding opening bracket.  */
  if (k == ')') c = '(';
  else if (k == ']') c = '[';
  else if (k == '}') c = '{';

  for (i=rl_point-2; i>=0; i--)
    {
      /* Is the current character part of a character literal?  */
      if (i - 2 >= 0
	  && rl_line_buffer[i - 1] == '\\'
	  && rl_line_buffer[i - 2] == '#')
	;
      else if (rl_line_buffer[i] == k)
	end_parens_found++;
      else if (rl_line_buffer[i] == '"')
	{
	  /* Skip over a string literal.  */
	  for (i--; i >= 0; i--)
	    if (rl_line_buffer[i] == '"'
		&& ! (i - 1 >= 0
		      && rl_line_buffer[i - 1] == '\\'))
	      break;
	}
      else if (rl_line_buffer[i] == c)
	{
	  if (end_parens_found==0)
	    return i;
	  else --end_parens_found;
	}
    }
  return -1;
}

static int
match_paren (int x, int k)
{
  int tmp;
#ifndef __MINGW32__
  int fno;
  SELECT_TYPE readset;
  struct timeval timeout;
#endif

  rl_insert (x, k);
  if (!SCM_READLINE_BOUNCE_PARENS)
    return 0;

  /* Did we just insert a quoted paren?  If so, then don't bounce.  */
  if (rl_point - 1 >= 1
      && rl_line_buffer[rl_point - 2] == '\\')
    return 0;

#ifndef __MINGW32__
  tmp = 1000 * SCM_READLINE_BOUNCE_PARENS;
  timeout.tv_sec = tmp / 1000000;
  timeout.tv_usec = tmp % 1000000;
  FD_ZERO (&readset);
  fno = fileno (rl_instream);
  FD_SET (fno, &readset);
#endif

  if (rl_point > 1)
    {
      tmp = rl_point;
      rl_point = find_matching_paren (k);
      if (rl_point > -1)
	{
	  rl_redisplay ();
#ifndef __MINGW32__
	  scm_std_select (fno + 1, &readset, NULL, NULL, &timeout);
#else
	  WaitForSingleObject (GetStdHandle(STD_INPUT_HANDLE),
			       SCM_READLINE_BOUNCE_PARENS); 
#endif
	}
      rl_point = tmp;
    }
  return 0;
}
#endif /* HAVE_RL_GET_KEYMAP */

#endif /* HAVE_RL_GETC_FUNCTION */

void
scm_init_readline ()
{
#ifdef HAVE_RL_GETC_FUNCTION
#include "guile-readline/readline.x"
  scm_readline_completion_function_var
    = scm_c_define ("*readline-completion-function*", SCM_BOOL_F);
#ifndef __MINGW32__
  rl_getc_function = current_input_getc;
#endif
#if defined (_RL_FUNCTION_TYPEDEF)
  rl_completion_entry_function = (rl_compentry_func_t*) completion_function;
#else  
  rl_completion_entry_function = (Function*) completion_function;
#endif
  rl_basic_word_break_characters = " \t\n\"'`;()";
  rl_readline_name = "Guile";

  /* Let Guile handle signals. */
#if defined (HAVE_DECL_RL_CATCH_SIGNALS) && HAVE_DECL_RL_CATCH_SIGNALS
  rl_catch_signals = 0;
#endif
  
  /* But let readline handle SIGWINCH. */
#if defined (HAVE_DECL_RL_CATCH_SIGWINCH) && HAVE_DECL_RL_CATCH_SIGWINCH
  rl_catch_sigwinch = 1;
#endif
  
  reentry_barrier_mutex = scm_make_mutex ();
  scm_init_opts (scm_readline_options,
		 scm_readline_opts);
#if HAVE_RL_GET_KEYMAP
  init_bouncing_parens();
#endif
  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
08467a7e	3	/* Copyright (C) 1997,1999,2000,2001, 2002, 2003, 2006, 2007, 2008, 2009, 2010, 2013 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
b82a8b48	7	* the Free Software Foundation; either version 3, or (at your option)
c374ab69 MV	8	* any later version.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this software; see the file COPYING. If not, write to
92205699 MV	17	* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
92205699 MV	18	* Boston, MA 02110-1301 USA
c374ab69 MV	19	*
c374ab69 MV	20	*/
f48e47b9	21
f48e47b9	22
c374ab69	23	\f
7a5ab369 LC	24	#ifdef HAVE_CONFIG_H
	25	# include <config.h>
	26	#endif
26aff4f9	27
62947883	28	#ifdef HAVE_RL_GETC_FUNCTION
fbf68f8b	29	#include "libguile.h"
739b3bf1 MD	30	#include "libguile/iselect.h"
739b3bf1 MD	31
ffdeebc3	32	#include <stdio.h>
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>
5e90b6ac	38	#ifndef __MINGW32__
c374ab69	39	#include <sys/time.h>
5e90b6ac MV	40	#else
	41	#include <io.h>
	42	#endif
b71099ba	43	#include <signal.h>
c374ab69	44
1c537018	45	#include "libguile/validate.h"
a0599745	46	#include "guile-readline/readline.h"
c374ab69	47
593be5d2	48	scm_t_option scm_readline_opts[] = {
c374ab69 MV	49	{ SCM_OPTION_BOOLEAN, "history-file", 1,
	50	"Use history file." },
	51	{ SCM_OPTION_INTEGER, "history-length", 200,
	52	"History length." },
	53	{ SCM_OPTION_INTEGER, "bounce-parens", 500,
62560650 HWN	54	"Time (ms) to show matching opening parenthesis (0 = off)."},
62560650 HWN	55	{ 0 }
c374ab69 MV	56	};
	57
	58	extern void stifle_history (int max);
	59
b916d813	60	SCM_DEFINE (scm_readline_options, "readline-options-interface", 0, 1, 0,
f48e47b9 GB	61	(SCM setting),
	62	"")
	63	#define FUNC_NAME s_scm_readline_options
c374ab69 MV	64	{
	65	SCM ans = scm_options (setting,
	66	scm_readline_opts,
f48e47b9	67	FUNC_NAME);
c374ab69 MV	68	stifle_history (SCM_HISTORY_LENGTH);
	69	return ans;
	70	}
f48e47b9	71	#undef FUNC_NAME
c374ab69 MV	72
	73	#ifndef HAVE_STRDUP
	74	static char *
	75	strdup (char *s)
	76	{
1be6b49c	77	size_t len = strlen (s);
c374ab69 MV	78	char *new = malloc (len + 1);
	79	strcpy (new, s);
	80	return new;
	81	}
	82	#endif /* HAVE_STRDUP */
	83
	84	#ifndef HAVE_RL_CLEANUP_AFTER_SIGNAL
	85
	86	/* These are readline functions added in release 2.3. They will work
	87	* together with readline-2.1 and 2.2. (The readline interface is
	88	* disabled for earlier releases.)
	89	* They are declared static; if we want to use them elsewhere, then
	90	* we need external declarations for them, but at the moment, I don't
	91	* think anything else in Guile ought to use these.
	92	*/
	93
	94	extern void _rl_clean_up_for_exit ();
	95	extern void _rl_kill_kbd_macro ();
	96	extern int _rl_init_argument ();
	97
2e3d5987	98	void
c374ab69 MV	99	rl_cleanup_after_signal ()
	100	{
	101	#ifdef HAVE_RL_CLEAR_SIGNALS
	102	_rl_clean_up_for_exit ();
	103	#endif
	104	(*rl_deprep_term_function) ();
	105	#ifdef HAVE_RL_CLEAR_SIGNALS
	106	rl_clear_signals ();
	107	#endif
	108	rl_pending_input = 0;
	109	}
	110
2e3d5987	111	void
c374ab69 MV	112	rl_free_line_state ()
	113	{
	114	register HIST_ENTRY *entry;
	115
	116	free_undo_list ();
	117
	118	entry = current_history ();
	119	if (entry)
	120	entry->data = (char *)NULL;
	121
	122	_rl_kill_kbd_macro ();
	123	rl_clear_message ();
	124	_rl_init_argument ();
	125	}
	126
	127	#endif /* !HAVE_RL_CLEANUP_AFTER_SIGNAL */
	128
	129	static int promptp;
	130	static SCM input_port;
75192345	131	static SCM output_port;
c374ab69 MV	132	static SCM before_read;
	133
	134	static int
e81d98ec	135	current_input_getc (FILE *in SCM_UNUSED)
c374ab69	136	{
be49d1df	137	if (promptp && scm_is_true (before_read))
c374ab69 MV	138	{
	139	scm_apply (before_read, SCM_EOL, SCM_EOL);
	140	promptp = 0;
	141	}
75192345	142	return scm_get_byte_or_eof (input_port);
c374ab69 MV	143	}
c374ab69 MV	144
c374ab69	145	static int in_readline = 0;
bb0f37e7	146	static SCM reentry_barrier_mutex;
c374ab69	147
f48e47b9	148	static SCM internal_readline (SCM text);
ddfb5e2b	149	static void unwind_readline (void *unused);
48552b1d	150	static void reentry_barrier (void);
f48e47b9 GB	151
f48e47b9 GB	152
b916d813	153	SCM_DEFINE (scm_readline, "%readline", 0, 4, 0,
f48e47b9 GB	154	(SCM text, SCM inp, SCM outp, SCM read_hook),
	155	"")
	156	#define FUNC_NAME s_scm_readline
	157	{
	158	SCM ans;
	159
	160	reentry_barrier ();
	161
	162	before_read = SCM_BOOL_F;
	163
	164	if (!SCM_UNBNDP (text))
	165	{
ad6dec05	166	if (!scm_is_string (text))
f48e47b9 GB	167	{
	168	--in_readline;
	169	scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	170	}
f48e47b9 GB	171	}
f48e47b9 GB	172
0ddf47fc	173	if (!((SCM_UNBNDP (inp) && SCM_OPINFPORTP (scm_current_input_port ()))
379b35da	174	\|\| SCM_OPINFPORTP (inp)))
f48e47b9 GB	175	{
	176	--in_readline;
	177	scm_misc_error (s_scm_readline,
	178	"Input port is not open or not a file port",
	179	SCM_EOL);
	180	}
	181
0ddf47fc	182	if (!((SCM_UNBNDP (outp) && SCM_OPOUTFPORTP (scm_current_output_port ()))
379b35da	183	\|\| SCM_OPOUTFPORTP (outp)))
f48e47b9 GB	184	{
	185	--in_readline;
	186	scm_misc_error (s_scm_readline,
	187	"Output port is not open or not a file port",
	188	SCM_EOL);
	189	}
	190
be49d1df	191	if (!(SCM_UNBNDP (read_hook) \|\| scm_is_false (read_hook)))
f48e47b9	192	{
be49d1df	193	if (scm_is_false (scm_thunk_p (read_hook)))
f48e47b9 GB	194	{
	195	--in_readline;
	196	scm_wrong_type_arg (s_scm_readline, SCM_ARG4, read_hook);
	197	}
	198	before_read = read_hook;
	199	}
	200
	201	scm_readline_init_ports (inp, outp);
	202
ddfb5e2b AW	203	scm_dynwind_begin (0);
	204	scm_dynwind_unwind_handler (unwind_readline, NULL, 0);
	205
	206	ans = internal_readline (text);
	207
	208	scm_dynwind_end ();
f48e47b9	209
8f99e3f3	210	#ifndef __MINGW32__
f48e47b9 GB	211	fclose (rl_instream);
f48e47b9 GB	212	fclose (rl_outstream);
8f99e3f3	213	#endif
f48e47b9 GB	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;
246c563b	225	/* We should rather use scm_try_mutex when it becomes available */
bb0f37e7	226	scm_lock_mutex (reentry_barrier_mutex);
c374ab69 MV	227	if (in_readline)
	228	reentryp = 1;
	229	else
	230	++in_readline;
bb0f37e7	231	scm_unlock_mutex (reentry_barrier_mutex);
c374ab69	232	if (reentryp)
f48e47b9	233	scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL);
c374ab69 MV	234	}
c374ab69 MV	235
ddfb5e2b AW	236	/* This function is only called on nonlocal exit from readline(). */
	237	static void
	238	unwind_readline (void *unused)
c374ab69 MV	239	{
	240	rl_free_line_state ();
	241	rl_cleanup_after_signal ();
739b3bf1	242	fputc ('\n', rl_outstream); /* We don't want next output on this line */
8f99e3f3	243	#ifndef __MINGW32__
c374ab69 MV	244	fclose (rl_instream);
c374ab69 MV	245	fclose (rl_outstream);
8f99e3f3	246	#endif
c374ab69	247	--in_readline;
c374ab69 MV	248	}
	249
	250	static SCM
	251	internal_readline (SCM text)
	252	{
	253	SCM ret;
	254	char *s;
ad6dec05	255	char *prompt = SCM_UNBNDP (text) ? "" : scm_to_locale_string (text);
c374ab69 MV	256
	257	promptp = 1;
	258	s = readline (prompt);
	259	if (s)
08467a7e	260	ret = scm_from_port_string (s, output_port);
c374ab69 MV	261	else
	262	ret = SCM_EOF_VAL;
	263
ad6dec05 MV	264	if (!SCM_UNBNDP (text))
ad6dec05 MV	265	free (prompt);
c374ab69 MV	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))
0ddf47fc	298	inp = scm_current_input_port ();
2e3d5987 MD	299
2e3d5987 MD	300	if (SCM_UNBNDP (outp))
0ddf47fc	301	outp = scm_current_output_port ();
2e3d5987	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;
75192345	316	output_port = outp;
8f99e3f3	317	#ifndef __MINGW32__
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);
8f99e3f3	320	#endif
2e3d5987 MD	321	}
2e3d5987 MD	322
c374ab69	323
c374ab69	324
b916d813	325	SCM_DEFINE (scm_add_history, "add-history", 1, 0, 0,
f48e47b9 GB	326	(SCM text),
	327	"")
	328	#define FUNC_NAME s_scm_add_history
c374ab69 MV	329	{
c374ab69 MV	330	char* s;
c374ab69	331
ad6dec05 MV	332	s = scm_to_locale_string (text);
ad6dec05 MV	333	add_history (s);
d3075c52	334	free (s);
c374ab69 MV	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	{
ad6dec05 MV	346	char *filename;
	347	SCM ret;
	348
	349	filename = scm_to_locale_string (file);
	350	ret = scm_from_bool (!read_history (filename));
	351	free (filename);
	352	return ret;
c374ab69	353	}
f48e47b9	354	#undef FUNC_NAME
c374ab69 MV	355
c374ab69 MV	356
b916d813	357	SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0,
f48e47b9 GB	358	(SCM file),
	359	"")
	360	#define FUNC_NAME s_scm_write_history
c374ab69	361	{
ad6dec05 MV	362	char *filename;
	363	SCM ret;
	364
	365	filename = scm_to_locale_string (file);
	366	ret = scm_from_bool (!write_history (filename));
	367	free (filename);
	368	return ret;
c374ab69	369	}
f48e47b9	370	#undef FUNC_NAME
c374ab69	371
8ed35a15 MV	372	SCM_DEFINE (scm_clear_history, "clear-history", 0, 0, 0,
	373	(),
	374	"Clear the history buffer of the readline machinery.")
	375	#define FUNC_NAME s_scm_clear_history
	376	{
	377	clear_history();
	378	return SCM_UNSPECIFIED;
	379	}
	380	#undef FUNC_NAME
	381
c374ab69	382
b916d813	383	SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0,
f48e47b9 GB	384	(SCM text, SCM continuep),
	385	"")
	386	#define FUNC_NAME s_scm_filename_completion_function
c374ab69 MV	387	{
	388	char *s;
	389	SCM ans;
ad6dec05	390	char *c_text = scm_to_locale_string (text);
dcb17187	391	#ifdef HAVE_RL_FILENAME_COMPLETION_FUNCTION
ad6dec05	392	s = rl_filename_completion_function (c_text, scm_is_true (continuep));
dcb17187	393	#else
ad6dec05	394	s = filename_completion_function (c_text, scm_is_true (continuep));
dcb17187	395	#endif
ad6dec05 MV	396	ans = scm_take_locale_string (s);
ad6dec05 MV	397	free (c_text);
c374ab69 MV	398	return ans;
c374ab69 MV	399	}
f48e47b9	400	#undef FUNC_NAME
c374ab69 MV	401
	402	/*
	403	* The following has been modified from code contributed by
	404	* Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>
	405	*/
	406
	407	SCM scm_readline_completion_function_var;
	408
	409	static char *
	410	completion_function (char *text, int continuep)
	411	{
296ff5e7	412	SCM compfunc = SCM_VARIABLE_REF (scm_readline_completion_function_var);
c374ab69 MV	413	SCM res;
c374ab69 MV	414
be49d1df	415	if (scm_is_false (compfunc))
c374ab69 MV	416	return NULL; /* #f => completion disabled */
	417	else
	418	{
ad6dec05	419	SCM t = scm_from_locale_string (text);
be49d1df	420	SCM c = scm_from_bool (continuep);
5b2a7b59	421	res = scm_apply (compfunc, scm_list_2 (t, c), SCM_EOL);
c374ab69	422
be49d1df	423	if (scm_is_false (res))
c374ab69 MV	424	return NULL;
c374ab69 MV	425
ad6dec05	426	return scm_to_locale_string (res);
c374ab69 MV	427	}
	428	}
	429
6a945c34	430	#if HAVE_RL_GET_KEYMAP
c374ab69 MV	431	/Bouncing parenthesis (reimplemented by GH, 11/23/98, since readline is strict gpl)/
c374ab69 MV	432
576cdec4 MD	433	static int match_paren (int x, int k);
	434	static int find_matching_paren (int k);
	435	static void init_bouncing_parens ();
c374ab69 MV	436
c374ab69 MV	437	static void
576cdec4	438	init_bouncing_parens ()
c374ab69	439	{
576cdec4 MD	440	if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
	441	{
	442	rl_bind_key (')', match_paren);
	443	rl_bind_key (']', match_paren);
	444	rl_bind_key ('}', match_paren);
	445	}
c374ab69 MV	446	}
	447
	448	static int
	449	find_matching_paren(int k)
	450	{
	451	register int i;
	452	register char c = 0;
	453	int end_parens_found = 0;
	454
	455	/* Choose the corresponding opening bracket. */
	456	if (k == ')') c = '(';
	457	else if (k == ']') c = '[';
	458	else if (k == '}') c = '{';
	459
	460	for (i=rl_point-2; i>=0; i--)
	461	{
	462	/* Is the current character part of a character literal? */
	463	if (i - 2 >= 0
	464	&& rl_line_buffer[i - 1] == '\\'
	465	&& rl_line_buffer[i - 2] == '#')
	466	;
	467	else if (rl_line_buffer[i] == k)
	468	end_parens_found++;
	469	else if (rl_line_buffer[i] == '"')
	470	{
	471	/* Skip over a string literal. */
	472	for (i--; i >= 0; i--)
	473	if (rl_line_buffer[i] == '"'
	474	&& ! (i - 1 >= 0
	475	&& rl_line_buffer[i - 1] == '\\'))
	476	break;
	477	}
	478	else if (rl_line_buffer[i] == c)
	479	{
576cdec4 MD	480	if (end_parens_found==0)
576cdec4 MD	481	return i;
c374ab69 MV	482	else --end_parens_found;
	483	}
	484	}
	485	return -1;
	486	}
	487
576cdec4 MD	488	static int
576cdec4 MD	489	match_paren (int x, int k)
c374ab69	490	{
8f99e3f3 SJ	491	int tmp;
	492	#ifndef __MINGW32__
	493	int fno;
aba2031a	494	SELECT_TYPE readset;
c374ab69	495	struct timeval timeout;
8f99e3f3 SJ	496	#endif
8f99e3f3 SJ	497
576cdec4	498	rl_insert (x, k);
c374ab69	499	if (!SCM_READLINE_BOUNCE_PARENS)
576cdec4	500	return 0;
c374ab69 MV	501
	502	/* Did we just insert a quoted paren? If so, then don't bounce. */
	503	if (rl_point - 1 >= 1
	504	&& rl_line_buffer[rl_point - 2] == '\\')
576cdec4	505	return 0;
c374ab69	506
8f99e3f3	507	#ifndef __MINGW32__
c374ab69 MV	508	tmp = 1000 * SCM_READLINE_BOUNCE_PARENS;
	509	timeout.tv_sec = tmp / 1000000;
	510	timeout.tv_usec = tmp % 1000000;
576cdec4	511	FD_ZERO (&readset);
bc858b80 MD	512	fno = fileno (rl_instream);
bc858b80 MD	513	FD_SET (fno, &readset);
8f99e3f3 SJ	514	#endif
8f99e3f3 SJ	515
576cdec4 MD	516	if (rl_point > 1)
	517	{
	518	tmp = rl_point;
	519	rl_point = find_matching_paren (k);
	520	if (rl_point > -1)
	521	{
	522	rl_redisplay ();
8f99e3f3	523	#ifndef __MINGW32__
0ddf47fc	524	scm_std_select (fno + 1, &readset, NULL, NULL, &timeout);
8f99e3f3 SJ	525	#else
	526	WaitForSingleObject (GetStdHandle(STD_INPUT_HANDLE),
	527	SCM_READLINE_BOUNCE_PARENS);
	528	#endif
576cdec4 MD	529	}
576cdec4 MD	530	rl_point = tmp;
c374ab69	531	}
576cdec4	532	return 0;
c374ab69	533	}
6a945c34	534	#endif /* HAVE_RL_GET_KEYMAP */
c374ab69	535
26047451 MD	536	#endif /* HAVE_RL_GETC_FUNCTION */
26047451 MD	537
c374ab69 MV	538	void
	539	scm_init_readline ()
	540	{
62947883	541	#ifdef HAVE_RL_GETC_FUNCTION
a0599745	542	#include "guile-readline/readline.x"
c374ab69	543	scm_readline_completion_function_var
296ff5e7	544	= scm_c_define ("readline-completion-function", SCM_BOOL_F);
8f99e3f3	545	#ifndef __MINGW32__
c374ab69	546	rl_getc_function = current_input_getc;
8f99e3f3	547	#endif
dcb17187 MV	548	#if defined (_RL_FUNCTION_TYPEDEF)
	549	rl_completion_entry_function = (rl_compentry_func_t*) completion_function;
	550	#else
c374ab69	551	rl_completion_entry_function = (Function*) completion_function;
dcb17187	552	#endif
4255e79f	553	rl_basic_word_break_characters = " \t\n\"'`;()";
5c11cc9d GH	554	rl_readline_name = "Guile";
5c11cc9d GH	555
ddfb5e2b AW	556	/* Let Guile handle signals. */
	557	#if defined (HAVE_DECL_RL_CATCH_SIGNALS) && HAVE_DECL_RL_CATCH_SIGNALS
	558	rl_catch_signals = 0;
	559	#endif
	560
	561	/* But let readline handle SIGWINCH. */
	562	#if defined (HAVE_DECL_RL_CATCH_SIGWINCH) && HAVE_DECL_RL_CATCH_SIGWINCH
	563	rl_catch_sigwinch = 1;
	564	#endif
	565
e7efe8e7	566	reentry_barrier_mutex = scm_make_mutex ();
c374ab69	567	scm_init_opts (scm_readline_options,
07109436	568	scm_readline_opts);
6a945c34	569	#if HAVE_RL_GET_KEYMAP
c374ab69	570	init_bouncing_parens();
6a945c34	571	#endif
c374ab69	572	scm_add_feature ("readline");
62947883	573	#endif /* HAVE_RL_GETC_FUNCTION */
c374ab69 MV	574	}
c374ab69 MV	575
89e00824 ML	576	/*
	577	Local Variables:
	578	c-file-style: "gnu"
	579	End:
	580	*/