Index: apps/plugins/lib/help.c
===================================================================
--- apps/plugins/lib/help.c	(revision 0)
+++ apps/plugins/lib/help.c	(revision 0)
@@ -0,0 +1,145 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2004-2007 Antoine Cellerier <dionoea @t videolan d.t org>
+ * Copyright (C) 2008 William Poetra Yoga Hadisoeseno
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+
+#include "plugin.h"
+#include "help.h"
+
+#include <ctype.h>
+
+static const struct plugin_api *rb;
+
+/* Initialize the context and format the help text to fit on the screen */
+void help_init(struct help_context *ctx, const struct plugin_api *api, int scrollbar_width, char *help_text, int button_up, int button_down, int button_quit)
+{
+    int w_space, h_space;
+
+    /* Initialize the context */
+
+    rb = api;
+    ctx->scrollbar = (scrollbar_width > 0);
+    ctx->scrollbar_width = ctx->scrollbar ? scrollbar_width : 0;
+    ctx->help_text = help_text;
+    ctx->button_up = button_up;
+    ctx->button_down = button_down;
+    ctx->button_quit = button_quit;
+
+    rb->lcd_getstringsize(" ", &w_space, &h_space);
+    ctx->line_height = h_space;
+    ctx->display_lines = LCD_HEIGHT / h_space;
+
+    /* Format the help text */
+
+    int lines;
+    char *c, *p, s;
+    int w_line, w_word;
+
+    c = ctx->help_text;
+    w_line = 0;
+    while (*c) {
+        if (*c == '\n') {
+            c++;
+            w_line = 0;
+            continue;
+        }
+
+        p = c + 1;
+        while (*p && !isspace(*p))
+            p++;
+
+        s = *p;
+        *p = '\0';
+        api->lcd_getstringsize(c, &w_word, NULL);
+        *p = s;
+        if (w_line == 0) {
+            w_line = w_word;
+        } else if (w_line + w_word > LCD_WIDTH) {
+            *c = '\n';
+            w_line = w_word;
+        } else {
+            w_line += w_word;
+        }
+        c = p;
+    }
+
+    /* count the number of lines */
+
+    c = ctx->help_text;
+    lines = 1;
+    while (*c) {
+        if (*c == '\n')
+            lines++;
+        c++;
+    }
+    ctx->total_lines = lines;
+
+    if (ctx->display_lines > ctx->total_lines)
+        ctx->display_lines = ctx->total_lines;
+}
+
+/* Show the help contents */
+enum help_ret help_show(const struct help_context *ctx)
+{
+    int firstline, i;
+    char *c;
+    int button;
+    int scrollbar_shift = (ctx->scrollbar) ? ctx->scrollbar_width + 1 : 0;
+
+    firstline = 0;
+    while (true) {
+        c = ctx->help_text;
+        for (i = 0; i < firstline; ++i)
+            c = rb->strchr(c, '\n') + 1;
+
+        rb->lcd_clear_display();
+        for (i = 0; i < ctx->display_lines; ++i) {
+            char s, *p;
+            p = rb->strchr(c, '\n');
+            if (p) {
+                s = *p;
+                *p = '\0';
+                rb->lcd_putsxy(scrollbar_shift, i * ctx->line_height, c);
+                *p = s;
+            } else {
+                rb->lcd_putsxy(scrollbar_shift, i * ctx->line_height, c);
+            }
+            c = p + 1;
+        }
+        if (ctx->scrollbar)
+            rb->gui_scrollbar_draw(rb->screens[SCREEN_MAIN], 0, 0, ctx->scrollbar_width, LCD_HEIGHT, ctx->total_lines, firstline, firstline + ctx->display_lines, VERTICAL);
+        rb->lcd_update();
+
+        button = rb->button_get(true);
+        if ((button&~BUTTON_REPEAT) == ctx->button_up) {
+            if (firstline > 0)
+                firstline--;
+        } else if ((button&~BUTTON_REPEAT) == ctx->button_down) {
+            if (firstline + ctx->display_lines < ctx->total_lines)
+                firstline++;
+        } else if (button == ctx->button_quit) {
+            return HELP_QUIT;
+        } else {
+            if(rb->default_event_handler(button) == SYS_USB_CONNECTED)
+                return HELP_USB;
+        }
+    }
+}
+
Index: apps/plugins/lib/help.h
===================================================================
--- apps/plugins/lib/help.h	(revision 0)
+++ apps/plugins/lib/help.h	(revision 0)
@@ -0,0 +1,49 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2004-2007 Antoine Cellerier <dionoea @t videolan d.t org>
+ * Copyright (C) 2008 William Poetra Yoga Hadisoeseno
+ *
+ * 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 software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef _LIB_HELP_H
+#define _LIB_HELP_H
+
+#include "plugin.h"
+
+struct help_context {
+  // whether to show the scrollbar and how wide
+  bool scrollbar;
+  int scrollbar_width;
+  // this is just a pointer to a user-supplied static buffer
+  char *help_text;
+  // buttons for scrolling up and down, and quitting
+  int button_up;
+  int button_down;
+  int button_quit;
+  // height of one line
+  int line_height;
+  // number of lines displayed and the total number of lines
+  int display_lines;
+  int total_lines;
+};
+
+enum help_ret { HELP_QUIT, HELP_USB };
+
+void help_init(struct help_context *, const struct plugin_api *api, int scrollbar_width, char *help_text, int button_up, int button_down, int button_quit);
+enum help_ret help_show(const struct help_context *);
+
+#endif /* _LIB_HELP_H */