#include <gtk/gtk.h> /*
gcc -Wall -O -g -o $(basename $0 .c) $0 $(gtk12-config --cflags --libs)
exit $?
*/
#include <stdio.h>
#include <stdlib.h>

static GtkWidget *clist;
static char **lines;		/* Malloced block of malloced blocks of lines */
static int numlines;		/* Number of lines we have read */
static int maxlines = 0;	/* Maximum number of lines in our allocation */

static void
my_init_filelist(GtkWidget *clist) {
	char *line;
	size_t linelen;
	int i;

	while ((line = fgetln(stdin, &linelen))) {
		char *outline = malloc(linelen);
		/* XXX Check here, and free on failure */
		if (!outline)
			abort();
		memcpy(outline, line, linelen-1);
		outline[linelen-1] = '\0';
		if (maxlines < numlines+2) {
			char **newlines;
			maxlines++;
			maxlines *= 2;
			newlines = realloc(lines, sizeof(char*)*maxlines);
			/* XXX Check here, and free on failure */
			if (!newlines)
				abort();
			lines = newlines;
		}
		lines[numlines++] = outline;
	}
	if (!lines)
		return;
	for (i = 0; i < numlines; i++)
		gtk_clist_append(GTK_CLIST(clist), &lines[i]);
}

static void
destroy(GtkWidget *widget, gpointer data) {
	GList *items;

	for (items = GTK_CLIST(clist)->selection; items; items = items->next)
		printf("%s\n", lines[(size_t)items->data]);
	gtk_main_quit();
}

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

	gtk_init(&argc, &argv);
	window = gtk_dialog_new();
	gtk_widget_set_usize(window, 300, 300);
	gtk_window_set_title(GTK_WINDOW(window), "listselect");
	gtk_signal_connect(GTK_OBJECT(window), "destroy",
			GTK_SIGNAL_FUNC(destroy), NULL);
	gtk_container_set_border_width(GTK_CONTAINER(window), 10);

	scrolled_window = gtk_scrolled_window_new(NULL, NULL);
	gtk_scrolled_window_set_policy(GTK_SCROLLED_WINDOW(scrolled_window),
	    GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(window)->vbox), scrolled_window,
	    TRUE, TRUE, 0);
	gtk_widget_show(scrolled_window);

	clist = gtk_clist_new(1);	/* 1 column */
	gtk_clist_set_selection_mode(GTK_CLIST(clist), GTK_SELECTION_MULTIPLE);
	my_init_filelist(clist);
	gtk_container_add(GTK_CONTAINER(scrolled_window), clist);
	gtk_widget_show(clist);

	button = gtk_button_new_with_label("Done");
	gtk_signal_connect_object(GTK_OBJECT(button), "clicked",
			GTK_SIGNAL_FUNC(gtk_widget_destroy), (gpointer)window);
	GTK_WIDGET_SET_FLAGS (button, GTK_CAN_DEFAULT);
	gtk_widget_grab_default (button);
	gtk_box_pack_start(GTK_BOX(GTK_DIALOG(window)->action_area), button,
	    TRUE, TRUE, 0);
	gtk_widget_show(button);
	gtk_widget_show(window);
	gtk_main();
	return 0;
}