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+/* -*-c-*- -------------- mixvm_loop.c :
+ * Implementation of mix vm command loop.
+ * ------------------------------------------------------------------
+ * $Id: mixvm_loop.c,v 1.15 2005/09/20 19:43:13 jao Exp $
+ * ------------------------------------------------------------------
+ * Copyright (C) 2000, 2001, 2002, 2004 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 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);
+ return fgets (line, LINE_LEN, stdin);
+}
+#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_ (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_ (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);
+}