#include <gtk/gtk.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <unistd.h>

extern char **environ;

void quit(GtkWidget *window, gpointer data) {
  gtk_exit(0);
}

void execute(GtkWidget *widget, GtkWidget *entry) {
  int i, j, b;
  char *cmd = gtk_entry_get_text(GTK_ENTRY(entry));
  char *argv[100], exe[100], *path[9];
  struct stat bf;

  for (i=0; i<100; i++) {
    argv[i] = malloc(500);
    memset(argv[i], 0, 500);
  }

  i = j = b = 0;

  memset(exe, 0, 100);
  if (*cmd == 0) gtk_exit(0);
  while (*cmd == ' ') cmd++;

  while (*cmd != 0) {
    argv[i][j] = (*cmd != ' ') ? *cmd : (!b) ? 0 : ' ';

    if (*cmd == '"' || *cmd == '\'') b = (b) ? 0 : 1, j--;

    if (*cmd == ' ' && !b) {
 	if (strcmp(argv[i], " ") > 0) i++;
 	j=0;
	cmd++;
    } else j++, cmd++;
  }

  argv[i][j] = (argv[i][j] == '"' || argv[i][j] == '\'') ? 0 : argv[i][j];
  if (i == 0 && j == 0) gtk_exit(0);

  argv[i+1] = 0;

  path[0] = "/bin";
  path[1] = "/sbin";
  path[2] = "/usr/bin";
  path[3] = "/usr/sbin";
  path[4] = "/usr/local/bin";
  path[5] = "/usr/local/sbin";
  path[6] = "/usr/games";
  path[7] = "/usr/X11R6/bin";
  path[8] = ".";

  if (argv[0][0] != '/')
    for (i=0; i<9; i++) {
      sprintf(exe, "%s/%s", path[i], argv[0]);
      if (stat(exe, &bf) == 0) break;
    }
  else strcpy(exe, argv[0]);

  if (execve(exe, argv, environ) == -1) gtk_exit(1);
}


int main(int argc, char *argv[]) {
  GtkWidget *window, *entry;

  gtk_init(&argc, &argv);

  window = gtk_window_new(GTK_WINDOW_TOPLEVEL);
  gtk_widget_set_uposition(GTK_WIDGET(window), 200, 300);
  gtk_signal_connect(GTK_OBJECT(window), "destroy", GTK_SIGNAL_FUNC(quit), 0);
  entry = gtk_entry_new_with_max_length (1024);
  gtk_widget_set_usize(GTK_WIDGET(entry), 400, 20);
  gtk_signal_connect(GTK_OBJECT(entry), "activate", GTK_SIGNAL_FUNC(execute), entry);

  gtk_container_add(GTK_CONTAINER(window), entry);

  gtk_widget_show(entry);
  gtk_widget_show(window);

  gtk_window_set_focus(GTK_WINDOW(window), entry);

  gtk_main();

  return 0;
}