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/* 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 */
#include "libguile/_scm.h"
#if defined (HAVE_RL_GETC_FUNCTION)
#include "libguile/libguile.h"
#include "libguile/gh.h"
#include "libguile/iselect.h"
#include <readline/readline.h>
#include <readline/history.h>
#include <sys/time.h>
#include "libguile/scm_validate.h"
#include "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)
{
SCM ans;
if (promptp && SCM_NIMP (before_read))
{
scm_apply (before_read, SCM_EOL, SCM_EOL);
promptp = 0;
}
ans = scm_getc (input_port);
return ans;
}
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 ();
SCM_DEFINE (scm_readline, "%readline", 0, 4, 0,
(SCM text, SCM inp, SCM outp, SCM read_hook),
"")
#define FUNC_NAME s_scm_readline
{
SCM ans;
reentry_barrier ();
before_read = SCM_BOOL_F;
if (!SCM_UNBNDP (text))
{
if (!(SCM_NIMP (text) && SCM_STRINGP (text)))
{
--in_readline;
scm_wrong_type_arg (s_scm_readline, SCM_ARG1, text);
}
SCM_COERCE_SUBSTR (text);
}
if (!((SCM_UNBNDP (inp) && SCM_NIMP (scm_cur_inp) && SCM_OPINFPORTP (inp))
|| SCM_NIMP (inp) && SCM_OPINFPORTP (inp)))
{
--in_readline;
scm_misc_error (s_scm_readline,
"Input port is not open or not a file port",
SCM_EOL);
}
if (!((SCM_UNBNDP (outp) && SCM_NIMP (scm_cur_outp) && SCM_OPINFPORTP (outp))
|| (SCM_NIMP (outp) && SCM_OPOUTFPORTP (outp))))
{
--in_readline;
scm_misc_error (s_scm_readline,
"Output port is not open or not a file port",
SCM_EOL);
}
if (!(SCM_UNBNDP (read_hook) || SCM_FALSEP (read_hook)))
{
if (!(SCM_NFALSEP (scm_thunk_p (read_hook))))
{
--in_readline;
scm_wrong_type_arg (s_scm_readline, SCM_ARG4, read_hook);
}
before_read = read_hook;
}
scm_readline_init_ports (inp, outp);
ans = scm_internal_catch (SCM_BOOL_T,
(scm_catch_body_t) internal_readline,
(void *) text,
handle_error, 0);
fclose (rl_instream);
fclose (rl_outstream);
--in_readline;
return ans;
}
#undef FUNC_NAME
static void
reentry_barrier ()
{
int reentryp = 0;
#ifdef USE_THREADS
/* We should rather use scm_mutex_try_lock when it becomes available */
scm_mutex_lock (&reentry_barrier_mutex);
#endif
if (in_readline)
reentryp = 1;
else
++in_readline;
#ifdef USE_THREADS
scm_mutex_unlock (&reentry_barrier_mutex);
#endif
if (reentryp)
scm_misc_error (s_scm_readline, "readline is not reentrant", SCM_EOL);
}
static SCM
handle_error (void *data, SCM tag, SCM args)
{
rl_free_line_state ();
rl_cleanup_after_signal ();
fputc ('\n', rl_outstream); /* We don't want next output on this line */
fclose (rl_instream);
fclose (rl_outstream);
--in_readline;
scm_handle_by_throw (data, tag, args);
return SCM_UNSPECIFIED; /* never reached */
}
static SCM
internal_readline (SCM text)
{
SCM ret;
char *s;
char *prompt = SCM_UNBNDP (text) ? "" : SCM_CHARS (text);
promptp = 1;
s = readline (prompt);
if (s)
ret = scm_makfrom0str (s);
else
ret = SCM_EOF_VAL;
free (s);
return ret;
}
static FILE *
stream_from_fport (SCM port, char *mode, const char *subr)
{
int fd;
FILE *f;
fd = dup (((struct scm_fport *) SCM_STREAM (port))->fdes);
if (fd == -1)
{
--in_readline;
scm_syserror (subr);
}
f = fdopen (fd, mode);
if (f == NULL)
{
--in_readline;
scm_syserror (subr);
}
return f;
}
void
scm_readline_init_ports (SCM inp, SCM outp)
{
if (SCM_UNBNDP (inp))
inp = scm_cur_inp;
if (SCM_UNBNDP (outp))
outp = scm_cur_outp;
if (!(SCM_NIMP (inp) && SCM_OPINFPORTP (inp))) {
scm_misc_error (0,
"Input port is not open or not a file port",
SCM_EOL);
}
if (!(SCM_NIMP (outp) && SCM_OPOUTFPORTP (outp))) {
scm_misc_error (0,
"Output port is not open or not a file port",
SCM_EOL);
}
input_port = inp;
rl_instream = stream_from_fport (inp, "r", s_scm_readline);
rl_outstream = stream_from_fport (outp, "w", s_scm_readline);
}
SCM_DEFINE (scm_add_history, "add-history", 1, 0, 0,
(SCM text),
"")
#define FUNC_NAME s_scm_add_history
{
char* s;
SCM_VALIDATE_STRING (1,text);
SCM_COERCE_SUBSTR (text);
s = SCM_CHARS (text);
add_history (strdup (s));
return SCM_UNSPECIFIED;
}
#undef FUNC_NAME
SCM_DEFINE (scm_read_history, "read-history", 1, 0, 0,
(SCM file),
"")
#define FUNC_NAME s_scm_read_history
{
SCM_VALIDATE_STRING (1,file);
return SCM_NEGATE_BOOL(read_history (SCM_ROCHARS (file)));
}
#undef FUNC_NAME
SCM_DEFINE (scm_write_history, "write-history", 1, 0, 0,
(SCM file),
"")
#define FUNC_NAME s_scm_write_history
{
SCM_VALIDATE_STRING (1,file);
return SCM_NEGATE_BOOL(write_history (SCM_ROCHARS (file)));
}
#undef FUNC_NAME
SCM_DEFINE (scm_filename_completion_function, "filename-completion-function", 2, 0, 0,
(SCM text, SCM continuep),
"")
#define FUNC_NAME s_scm_filename_completion_function
{
char *s;
SCM ans;
SCM_VALIDATE_STRING (1,text);
SCM_COERCE_SUBSTR (text);
s = filename_completion_function (SCM_CHARS (text), SCM_NFALSEP (continuep));
ans = scm_makfrom0str (s);
free (s);
return ans;
}
#undef FUNC_NAME
/*
* The following has been modified from code contributed by
* Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>
*/
SCM scm_readline_completion_function_var;
static char *
completion_function (char *text, int continuep)
{
SCM compfunc = SCM_CDR (scm_readline_completion_function_var);
SCM res;
if (SCM_FALSEP (compfunc))
return NULL; /* #f => completion disabled */
else
{
SCM t = scm_makfrom0str (text);
SCM c = continuep ? SCM_BOOL_T : SCM_BOOL_F;
res = scm_apply (compfunc, SCM_LIST2 (t, c), SCM_EOL);
if (SCM_FALSEP (res))
return NULL;
if (!(SCM_NIMP (res) && SCM_STRINGP (res)))
scm_misc_error (s_scm_readline,
"Completion function returned bogus value: %S",
SCM_LIST1 (res));
SCM_COERCE_SUBSTR (res);
return strdup (SCM_CHARS (res));
}
}
/*Bouncing parenthesis (reimplemented by GH, 11/23/98, since readline is strict gpl)*/
static int match_paren (int x, int k);
static int find_matching_paren (int k);
static void init_bouncing_parens ();
static void
init_bouncing_parens ()
{
if (strncmp (rl_get_keymap_name (rl_get_keymap ()), "vi", 2))
{
rl_bind_key (')', match_paren);
rl_bind_key (']', match_paren);
rl_bind_key ('}', match_paren);
}
}
static int
find_matching_paren(int k)
{
register int i;
register char c = 0;
int end_parens_found = 0;
/* Choose the corresponding opening bracket. */
if (k == ')') c = '(';
else if (k == ']') c = '[';
else if (k == '}') c = '{';
for (i=rl_point-2; i>=0; i--)
{
/* Is the current character part of a character literal? */
if (i - 2 >= 0
&& rl_line_buffer[i - 1] == '\\'
&& rl_line_buffer[i - 2] == '#')
;
else if (rl_line_buffer[i] == k)
end_parens_found++;
else if (rl_line_buffer[i] == '"')
{
/* Skip over a string literal. */
for (i--; i >= 0; i--)
if (rl_line_buffer[i] == '"'
&& ! (i - 1 >= 0
&& rl_line_buffer[i - 1] == '\\'))
break;
}
else if (rl_line_buffer[i] == c)
{
if (end_parens_found==0)
return i;
else --end_parens_found;
}
}
return -1;
}
static int
match_paren (int x, int k)
{
int tmp;
fd_set 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);
FD_SET (fileno (rl_instream), &readset);
if (rl_point > 1)
{
tmp = rl_point;
rl_point = find_matching_paren (k);
if (rl_point > -1)
{
rl_redisplay ();
scm_internal_select (1, &readset, NULL, NULL, &timeout);
}
rl_point = tmp;
}
return 0;
}
void
scm_init_readline ()
{
#include "readline.x"
scm_readline_completion_function_var
= scm_sysintern ("*readline-completion-function*", SCM_BOOL_F);
rl_getc_function = current_input_getc;
rl_redisplay_function = redisplay;
rl_completion_entry_function = (Function*) completion_function;
rl_basic_word_break_characters = "\t\n\"'`;()";
rl_readline_name = "Guile";
#ifdef USE_THREADS
scm_mutex_init (&reentry_barrier_mutex);
#endif
scm_init_opts (scm_readline_options,
scm_readline_opts,
SCM_N_READLINE_OPTIONS);
init_bouncing_parens();
scm_add_feature ("readline");
}
#endif
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