[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
 *
 */

/* 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"

#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_option_t 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_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_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_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_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_t *) 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);
  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_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);
  SCM_STRING_COERCE_0TERMINATION_X (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_LIST2 (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_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_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 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
ffdeebc3	33	#include <stdio.h>
48552b1d MD	34	#ifdef HAVE_UNISTD_H
	35	#include <unistd.h>
	36	#endif
c374ab69 MV	37	#include <readline/readline.h>
c374ab69 MV	38	#include <readline/history.h>
c374ab69	39	#include <sys/time.h>
b71099ba	40	#include <signal.h>
c374ab69	41
1c537018	42	#include "libguile/validate.h"
a0599745	43	#include "guile-readline/readline.h"
c374ab69	44
90d892e3	45	scm_option_t scm_readline_opts[] = {
c374ab69 MV	46	{ SCM_OPTION_BOOLEAN, "history-file", 1,
	47	"Use history file." },
	48	{ SCM_OPTION_INTEGER, "history-length", 200,
	49	"History length." },
	50	{ SCM_OPTION_INTEGER, "bounce-parens", 500,
	51	"Time (ms) to show matching opening parenthesis (0 = off)."}
	52	};
	53
	54	extern void stifle_history (int max);
	55
b916d813	56	SCM_DEFINE (scm_readline_options, "readline-options-interface", 0, 1, 0,
f48e47b9 GB	57	(SCM setting),
	58	"")
	59	#define FUNC_NAME s_scm_readline_options
c374ab69 MV	60	{
	61	SCM ans = scm_options (setting,
	62	scm_readline_opts,
	63	SCM_N_READLINE_OPTIONS,
f48e47b9	64	FUNC_NAME);
c374ab69 MV	65	stifle_history (SCM_HISTORY_LENGTH);
	66	return ans;
	67	}
f48e47b9	68	#undef FUNC_NAME
c374ab69 MV	69
	70	#ifndef HAVE_STRDUP
	71	static char *
	72	strdup (char *s)
	73	{
1be6b49c	74	size_t len = strlen (s);
c374ab69 MV	75	char *new = malloc (len + 1);
	76	strcpy (new, s);
	77	return new;
	78	}
	79	#endif /* HAVE_STRDUP */
	80
	81	#ifndef HAVE_RL_CLEANUP_AFTER_SIGNAL
	82
	83	/* These are readline functions added in release 2.3. They will work
	84	* together with readline-2.1 and 2.2. (The readline interface is
	85	* disabled for earlier releases.)
	86	* They are declared static; if we want to use them elsewhere, then
	87	* we need external declarations for them, but at the moment, I don't
	88	* think anything else in Guile ought to use these.
	89	*/
	90
	91	extern void _rl_clean_up_for_exit ();
	92	extern void _rl_kill_kbd_macro ();
	93	extern int _rl_init_argument ();
	94
2e3d5987	95	void
c374ab69 MV	96	rl_cleanup_after_signal ()
	97	{
	98	#ifdef HAVE_RL_CLEAR_SIGNALS
	99	_rl_clean_up_for_exit ();
	100	#endif
	101	(*rl_deprep_term_function) ();
	102	#ifdef HAVE_RL_CLEAR_SIGNALS
	103	rl_clear_signals ();
	104	#endif
	105	rl_pending_input = 0;
	106	}
	107
2e3d5987	108	void
c374ab69 MV	109	rl_free_line_state ()
	110	{
	111	register HIST_ENTRY *entry;
	112
	113	free_undo_list ();
	114
	115	entry = current_history ();
	116	if (entry)
	117	entry->data = (char *)NULL;
	118
	119	_rl_kill_kbd_macro ();
	120	rl_clear_message ();
	121	_rl_init_argument ();
	122	}
	123
	124	#endif /* !HAVE_RL_CLEANUP_AFTER_SIGNAL */
	125
	126	static int promptp;
	127	static SCM input_port;
	128	static SCM before_read;
	129
	130	static int
e81d98ec	131	current_input_getc (FILE *in SCM_UNUSED)
c374ab69	132	{
379b35da	133	if (promptp && !SCM_FALSEP (before_read))
c374ab69 MV	134	{
	135	scm_apply (before_read, SCM_EOL, SCM_EOL);
	136	promptp = 0;
	137	}
bc858b80	138	return scm_getc (input_port);
c374ab69 MV	139	}
	140
	141	static void
	142	redisplay ()
	143	{
	144	rl_redisplay ();
	145	/* promptp = 1; */
	146	}
	147
c374ab69 MV	148	static int in_readline = 0;
	149	#ifdef USE_THREADS
	150	static scm_mutex_t reentry_barrier_mutex;
	151	#endif
	152
f48e47b9 GB	153	static SCM internal_readline (SCM text);
f48e47b9 GB	154	static SCM handle_error (void *data, SCM tag, SCM args);
48552b1d	155	static void reentry_barrier (void);
f48e47b9 GB	156
f48e47b9 GB	157
b916d813	158	SCM_DEFINE (scm_readline, "%readline", 0, 4, 0,
f48e47b9 GB	159	(SCM text, SCM inp, SCM outp, SCM read_hook),
	160	"")
	161	#define FUNC_NAME s_scm_readline
	162	{
	163	SCM ans;
	164
	165	reentry_barrier ();
	166
	167	before_read = SCM_BOOL_F;
	168
	169	if (!SCM_UNBNDP (text))
	170	{
379b35da	171	if (!SCM_STRINGP (text))
f48e47b9 GB	172	{
	173	--in_readline;
	174	scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
	175	}
08b5e6c3	176	SCM_STRING_COERCE_0TERMINATION_X (text);
f48e47b9 GB	177	}
f48e47b9 GB	178
379b35da DH	179	if (!((SCM_UNBNDP (inp) && SCM_OPINFPORTP (scm_cur_inp))
379b35da DH	180	\|\| SCM_OPINFPORTP (inp)))
f48e47b9 GB	181	{
	182	--in_readline;
	183	scm_misc_error (s_scm_readline,
	184	"Input port is not open or not a file port",
	185	SCM_EOL);
	186	}
	187
379b35da DH	188	if (!((SCM_UNBNDP (outp) && SCM_OPINFPORTP (scm_cur_outp))
379b35da DH	189	\|\| SCM_OPOUTFPORTP (outp)))
f48e47b9 GB	190	{
	191	--in_readline;
	192	scm_misc_error (s_scm_readline,
	193	"Output port is not open or not a file port",
	194	SCM_EOL);
	195	}
	196
	197	if (!(SCM_UNBNDP (read_hook) \|\| SCM_FALSEP (read_hook)))
	198	{
	199	if (!(SCM_NFALSEP (scm_thunk_p (read_hook))))
	200	{
	201	--in_readline;
	202	scm_wrong_type_arg (s_scm_readline, SCM_ARG4, read_hook);
	203	}
	204	before_read = read_hook;
	205	}
	206
	207	scm_readline_init_ports (inp, outp);
	208
	209	ans = scm_internal_catch (SCM_BOOL_T,
	210	(scm_catch_body_t) internal_readline,
f60d011a	211	(void *) SCM_UNPACK (text),
f48e47b9 GB	212	handle_error, 0);
	213
	214	fclose (rl_instream);
	215	fclose (rl_outstream);
	216
	217	--in_readline;
	218	return ans;
	219	}
	220	#undef FUNC_NAME
	221
	222
c374ab69 MV	223	static void
	224	reentry_barrier ()
	225	{
	226	int reentryp = 0;
	227	#ifdef USE_THREADS
	228	/* We should rather use scm_mutex_try_lock when it becomes available */
	229	scm_mutex_lock (&reentry_barrier_mutex);
	230	#endif
	231	if (in_readline)
	232	reentryp = 1;
	233	else
	234	++in_readline;
	235	#ifdef USE_THREADS
	236	scm_mutex_unlock (&reentry_barrier_mutex);
	237	#endif
	238	if (reentryp)
f48e47b9	239	scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL);
c374ab69 MV	240	}
	241
	242	static SCM
	243	handle_error (void *data, SCM tag, SCM args)
	244	{
	245	rl_free_line_state ();
	246	rl_cleanup_after_signal ();
739b3bf1	247	fputc ('\n', rl_outstream); /* We don't want next output on this line */
c374ab69 MV	248	fclose (rl_instream);
	249	fclose (rl_outstream);
	250	--in_readline;
	251	scm_handle_by_throw (data, tag, args);
	252	return SCM_UNSPECIFIED; /* never reached */
	253	}
	254
	255	static SCM
	256	internal_readline (SCM text)
	257	{
	258	SCM ret;
	259	char *s;
08b5e6c3	260	char *prompt = SCM_UNBNDP (text) ? "" : SCM_STRING_CHARS (text);
c374ab69 MV	261
	262	promptp = 1;
	263	s = readline (prompt);
	264	if (s)
	265	ret = scm_makfrom0str (s);
	266	else
	267	ret = SCM_EOF_VAL;
	268
	269	free (s);
	270
	271	return ret;
	272	}
	273
	274	static FILE *
	275	stream_from_fport (SCM port, char mode, const char subr)
	276	{
	277	int fd;
	278	FILE *f;
	279
90d892e3	280	fd = dup (((struct scm_fport_t *) SCM_STREAM (port))->fdes);
c374ab69 MV	281	if (fd == -1)
	282	{
	283	--in_readline;
	284	scm_syserror (subr);
	285	}
	286
	287	f = fdopen (fd, mode);
	288	if (f == NULL)
	289	{
	290	--in_readline;
	291	scm_syserror (subr);
	292	}
	293
	294	return f;
	295	}
	296
2e3d5987 MD	297	void
	298	scm_readline_init_ports (SCM inp, SCM outp)
	299	{
	300	if (SCM_UNBNDP (inp))
	301	inp = scm_cur_inp;
	302
	303	if (SCM_UNBNDP (outp))
	304	outp = scm_cur_outp;
	305
379b35da	306	if (!SCM_OPINFPORTP (inp)) {
2e3d5987 MD	307	scm_misc_error (0,
	308	"Input port is not open or not a file port",
	309	SCM_EOL);
	310	}
	311
379b35da	312	if (!SCM_OPOUTFPORTP (outp)) {
2e3d5987 MD	313	scm_misc_error (0,
	314	"Output port is not open or not a file port",
	315	SCM_EOL);
	316	}
	317
	318	input_port = inp;
f48e47b9 GB	319	rl_instream = stream_from_fport (inp, "r", s_scm_readline);
f48e47b9 GB	320	rl_outstream = stream_from_fport (outp, "w", s_scm_readline);
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;
cbaee92a	331	SCM_VALIDATE_STRING (1,text);
08b5e6c3	332	SCM_STRING_COERCE_0TERMINATION_X (text);
c374ab69	333
08b5e6c3	334	s = SCM_STRING_CHARS (text);
c374ab69 MV	335	add_history (strdup (s));
	336
	337	return SCM_UNSPECIFIED;
	338	}
f48e47b9	339	#undef FUNC_NAME
c374ab69 MV	340
c374ab69 MV	341
b916d813	342	SCM_DEFINE (scm_read_history, "read-history", 1, 0, 0,
f48e47b9 GB	343	(SCM file),
	344	"")
	345	#define FUNC_NAME s_scm_read_history
c374ab69	346	{
cbaee92a	347	SCM_VALIDATE_STRING (1,file);
08b5e6c3	348	return SCM_NEGATE_BOOL (read_history (SCM_STRING_CHARS (file)));
c374ab69	349	}
f48e47b9	350	#undef FUNC_NAME
c374ab69 MV	351
c374ab69 MV	352
b916d813	353	SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0,
f48e47b9 GB	354	(SCM file),
	355	"")
	356	#define FUNC_NAME s_scm_write_history
c374ab69	357	{
cbaee92a	358	SCM_VALIDATE_STRING (1,file);
08b5e6c3	359	return SCM_NEGATE_BOOL (write_history (SCM_STRING_CHARS (file)));
c374ab69	360	}
f48e47b9	361	#undef FUNC_NAME
c374ab69	362
8ed35a15 MV	363	SCM_DEFINE (scm_clear_history, "clear-history", 0, 0, 0,
	364	(),
	365	"Clear the history buffer of the readline machinery.")
	366	#define FUNC_NAME s_scm_clear_history
	367	{
	368	clear_history();
	369	return SCM_UNSPECIFIED;
	370	}
	371	#undef FUNC_NAME
	372
c374ab69	373
b916d813	374	SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0,
f48e47b9 GB	375	(SCM text, SCM continuep),
	376	"")
	377	#define FUNC_NAME s_scm_filename_completion_function
c374ab69 MV	378	{
	379	char *s;
	380	SCM ans;
cbaee92a	381	SCM_VALIDATE_STRING (1,text);
08b5e6c3	382	SCM_STRING_COERCE_0TERMINATION_X (text);
dcb17187 MV	383	#ifdef HAVE_RL_FILENAME_COMPLETION_FUNCTION
	384	s = rl_filename_completion_function (SCM_STRING_CHARS (text), SCM_NFALSEP (continuep));
	385	#else
08b5e6c3	386	s = filename_completion_function (SCM_STRING_CHARS (text), SCM_NFALSEP (continuep));
dcb17187	387	#endif
c374ab69 MV	388	ans = scm_makfrom0str (s);
	389	free (s);
	390	return ans;
	391	}
f48e47b9	392	#undef FUNC_NAME
c374ab69 MV	393
	394	/*
	395	* The following has been modified from code contributed by
	396	* Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>
	397	*/
	398
	399	SCM scm_readline_completion_function_var;
	400
	401	static char *
	402	completion_function (char *text, int continuep)
	403	{
296ff5e7	404	SCM compfunc = SCM_VARIABLE_REF (scm_readline_completion_function_var);
c374ab69 MV	405	SCM res;
	406
	407	if (SCM_FALSEP (compfunc))
	408	return NULL; /* #f => completion disabled */
	409	else
	410	{
	411	SCM t = scm_makfrom0str (text);
	412	SCM c = continuep ? SCM_BOOL_T : SCM_BOOL_F;
	413	res = scm_apply (compfunc, SCM_LIST2 (t, c), SCM_EOL);
	414
	415	if (SCM_FALSEP (res))
	416	return NULL;
	417
379b35da	418	if (!SCM_STRINGP (res))
f48e47b9	419	scm_misc_error (s_scm_readline,
c374ab69 MV	420	"Completion function returned bogus value: %S",
c374ab69 MV	421	SCM_LIST1 (res));
08b5e6c3 DH	422	SCM_STRING_COERCE_0TERMINATION_X (res);
08b5e6c3 DH	423	return strdup (SCM_STRING_CHARS (res));
c374ab69 MV	424	}
	425	}
	426
	427	/Bouncing parenthesis (reimplemented by GH, 11/23/98, since readline is strict gpl)/
	428
576cdec4 MD	429	static int match_paren (int x, int k);
	430	static int find_matching_paren (int k);
	431	static void init_bouncing_parens ();
c374ab69 MV	432
c374ab69 MV	433	static void
576cdec4	434	init_bouncing_parens ()
c374ab69	435	{
576cdec4 MD	436	if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
	437	{
	438	rl_bind_key (')', match_paren);
	439	rl_bind_key (']', match_paren);
	440	rl_bind_key ('}', match_paren);
	441	}
c374ab69 MV	442	}
	443
	444	static int
	445	find_matching_paren(int k)
	446	{
	447	register int i;
	448	register char c = 0;
	449	int end_parens_found = 0;
	450
	451	/* Choose the corresponding opening bracket. */
	452	if (k == ')') c = '(';
	453	else if (k == ']') c = '[';
	454	else if (k == '}') c = '{';
	455
	456	for (i=rl_point-2; i>=0; i--)
	457	{
	458	/* Is the current character part of a character literal? */
	459	if (i - 2 >= 0
	460	&& rl_line_buffer[i - 1] == '\\'
	461	&& rl_line_buffer[i - 2] == '#')
	462	;
	463	else if (rl_line_buffer[i] == k)
	464	end_parens_found++;
	465	else if (rl_line_buffer[i] == '"')
	466	{
	467	/* Skip over a string literal. */
	468	for (i--; i >= 0; i--)
	469	if (rl_line_buffer[i] == '"'
	470	&& ! (i - 1 >= 0
	471	&& rl_line_buffer[i - 1] == '\\'))
	472	break;
	473	}
	474	else if (rl_line_buffer[i] == c)
	475	{
576cdec4 MD	476	if (end_parens_found==0)
576cdec4 MD	477	return i;
c374ab69 MV	478	else --end_parens_found;
	479	}
	480	}
	481	return -1;
	482	}
	483
576cdec4 MD	484	static int
576cdec4 MD	485	match_paren (int x, int k)
c374ab69	486	{
bc858b80	487	int tmp, fno;
aba2031a	488	SELECT_TYPE readset;
c374ab69 MV	489	struct timeval timeout;
c374ab69 MV	490
576cdec4	491	rl_insert (x, k);
c374ab69	492	if (!SCM_READLINE_BOUNCE_PARENS)
576cdec4	493	return 0;
c374ab69 MV	494
	495	/* Did we just insert a quoted paren? If so, then don't bounce. */
	496	if (rl_point - 1 >= 1
	497	&& rl_line_buffer[rl_point - 2] == '\\')
576cdec4	498	return 0;
c374ab69 MV	499
	500	tmp = 1000 * SCM_READLINE_BOUNCE_PARENS;
	501	timeout.tv_sec = tmp / 1000000;
	502	timeout.tv_usec = tmp % 1000000;
576cdec4	503	FD_ZERO (&readset);
bc858b80 MD	504	fno = fileno (rl_instream);
bc858b80 MD	505	FD_SET (fno, &readset);
c374ab69	506
576cdec4 MD	507	if (rl_point > 1)
	508	{
	509	tmp = rl_point;
	510	rl_point = find_matching_paren (k);
	511	if (rl_point > -1)
	512	{
	513	rl_redisplay ();
bc858b80	514	scm_internal_select (fno + 1, &readset, NULL, NULL, &timeout);
576cdec4 MD	515	}
576cdec4 MD	516	rl_point = tmp;
c374ab69	517	}
576cdec4	518	return 0;
c374ab69 MV	519	}
c374ab69 MV	520
b71099ba MD	521	#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
	522	/* Readline disables SA_RESTART on SIGWINCH.
	523	* This code turns it back on.
	524	*/
	525	static int
	526	sigwinch_enable_restart (void)
	527	{
	528	#ifdef HAVE_SIGINTERRUPT
	529	siginterrupt (SIGWINCH, 0);
	530	#else
	531	struct sigaction action;
	532
	533	sigaction (SIGWINCH, NULL, &action);
	534	action.sa_flags \|= SA_RESTART;
	535	sigaction (SIGWINCH, &action, NULL);
	536	#endif
	537	return 0;
	538	}
	539	#endif
	540
26047451 MD	541	#endif /* HAVE_RL_GETC_FUNCTION */
26047451 MD	542
c374ab69 MV	543	void
	544	scm_init_readline ()
	545	{
62947883	546	#ifdef HAVE_RL_GETC_FUNCTION
a0599745	547	#include "guile-readline/readline.x"
c374ab69	548	scm_readline_completion_function_var
296ff5e7	549	= scm_c_define ("readline-completion-function", SCM_BOOL_F);
c374ab69 MV	550	rl_getc_function = current_input_getc;
c374ab69 MV	551	rl_redisplay_function = redisplay;
dcb17187 MV	552	#if defined (_RL_FUNCTION_TYPEDEF)
	553	rl_completion_entry_function = (rl_compentry_func_t*) completion_function;
	554	#else
c374ab69	555	rl_completion_entry_function = (Function*) completion_function;
dcb17187	556	#endif
c374ab69	557	rl_basic_word_break_characters = "\t\n\"'`;()";
5c11cc9d	558	rl_readline_name = "Guile";
b71099ba MD	559	#if defined (HAVE_RL_PRE_INPUT_HOOK) && defined (GUILE_SIGWINCH_SA_RESTART_CLEARED)
	560	rl_pre_input_hook = sigwinch_enable_restart;
	561	#endif
5c11cc9d	562
c374ab69	563	#ifdef USE_THREADS
b74b1a63	564	scm_mutex_init (&reentry_barrier_mutex);
c374ab69 MV	565	#endif
	566	scm_init_opts (scm_readline_options,
	567	scm_readline_opts,
	568	SCM_N_READLINE_OPTIONS);
	569	init_bouncing_parens();
	570	scm_add_feature ("readline");
62947883	571	#endif /* HAVE_RL_GETC_FUNCTION */
c374ab69 MV	572	}
c374ab69 MV	573
89e00824 ML	574	/*
	575	Local Variables:
	576	c-file-style: "gnu"
	577	End:
	578	*/