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/* -*-c-*- -------------- mixvm_loop.c :
* Implementation of mix vm command loop.
* ------------------------------------------------------------------
* Copyright (C) 2000, 2001, 2002, 2004, 2006, 2007, 2009, 2010 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 of the License, 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
*/
#include <stdio.h>
#include <string.h>
#include <mixlib/mix.h>
#include <mixlib/mix_config.h>
#include <mixlib/mix_vm.h>
#include <mixlib/mix_device.h>
#include <mixlib/mix_vm_dump.h>
#ifdef MAKE_GUILE
#include <mixguile/mixguile.h>
#endif
#include "mixvm_command.h"
#include "mixvm_loop.h"
#ifdef HAVE_LIBHISTORY
# include <readline/history.h>
#else
# define add_history(x) ((void)0)
#endif
#ifdef HAVE_LIBREADLINE
# include <readline/readline.h>
#else /* !HAVE_LIBREADLINE */
static char *
readline (char *prompt)
{
enum {LINE_LEN = 256};
char *line = g_new (char, LINE_LEN);
printf ("%s", prompt);
if (fgets (line, LINE_LEN, stdin) == NULL)
{
g_free(line);
return (NULL);
}
return (line);
}
#endif /* HAVE_LIBREADLINE */
/* A static variable for holding the line. */
static char *line_read = (char *)NULL;
#define PROMPT_LEN 128
static char PROMPT[PROMPT_LEN + 1] = {'M', 'I', 'X', '>', ' '};
static const char *CONFIG_FILE_ = "mixvm.config";
static const char *PROMPT_KEY_ = "Prompt";
/* Read a string, and return a pointer to it. Returns NULL on EOF. */
static char *
rl_gets ()
{
/* If the buffer has already been allocated, return the memory
to the free pool. */
if (line_read)
{
g_free (line_read);
line_read = (char *)NULL;
}
/* Get a line from the user. */
line_read = readline ((char *)PROMPT);
/* If the line has any text in it, save it on the history. */
if (line_read && *line_read)
add_history (line_read);
return (line_read);
}
/* The main command loop of the virtual machine */
static mix_config_t *config_ = NULL;
static mix_vm_cmd_dispatcher_t *
init_mixvm_ (const gchar *file, gboolean use_emacs)
{
static const gchar *HISTORY_FILE = "mixvm.history";
static gint HISTORY_SIZE = 100;
config_ = mix_config_new (NULL, CONFIG_FILE_);
mix_config_set_autosave (config_, TRUE);
if (!mix_config_get_history_file (config_))
mix_config_set_history_file (config_, HISTORY_FILE);
if (mix_config_get_history_size (config_) == 0)
mix_config_set_history_size (config_, HISTORY_SIZE);
mix_vmloop_set_prompt (mix_config_get (config_, PROMPT_KEY_));
return mixvm_cmd_init (config_, (char *)file, use_emacs);
}
void
mix_vmloop_set_prompt (const gchar *prompt)
{
if (prompt)
{
g_snprintf (PROMPT, PROMPT_LEN, "%s ", prompt);
mix_config_update (config_, PROMPT_KEY_, prompt);
}
}
static void
loop_ (void *closure, int argc, char *argv[])
{
while ( mixvm_cmd_exec (rl_gets ()) )
;
mix_config_delete (config_);
}
void
mix_vmloop (int argc, char *argv[], gboolean initfile,
const gchar *file, gboolean use_emacs)
{
#ifdef MAKE_GUILE
mix_vm_cmd_dispatcher_t *dis = init_mixvm_ (file, use_emacs);
mixguile_init (argc, argv, initfile, loop_, dis);
#else
(void) init_mixvm_ (file, use_emacs);
loop_ (NULL, argc, argv);
#endif
}
/* run a program and exit */
void
mix_vmrun (const gchar *code_file, gboolean dump, gboolean ptime)
{
gchar *time_cmd = ptime? g_strdup ("stime on") : g_strdup ("stime off");
gchar *run_cmd = g_strdup ("run");
gchar *dump_cmd = dump? g_strdup ("pall") : NULL;
gboolean result;
init_mixvm_ (code_file, FALSE);
result = mixvm_cmd_exec (time_cmd) && mixvm_cmd_exec (run_cmd);
if (result && dump) mixvm_cmd_exec (dump_cmd);
mix_config_set_autosave (config_, FALSE);
mix_config_delete (config_);
g_free(time_cmd);
g_free(run_cmd);
if (dump_cmd) g_free(dump_cmd);
}
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