NAME

drawer.lua — bootloader menu/screen drawer module

DESCRIPTION

drawer.lua contains functionality for drawing and manipulating the menu, logo, and brand to the screen.

Before using the functionality provided by drawer.lua, it must be included with a statement such as the following:

local drawer =
  require("drawer")

BRAND DEFINITIONS

Brand definitions describe a “brand”, traditionally drawn above the menu. The exact position may be controlled by using the loader.conf(5) variables loader_brand_x and loader_brand_y. The following keys may be defined for a brand definition:

graphic: A table of strings containing rows of text to be drawn to the screen.

LOGO DEFINITIONS

Logo definitions describe a “logo”, traditionally to the right of the menu. The exact position may be controlled by using the loader.conf(5) variables loader_logo_x and loader_logo_y. The following keys may be defined for a logo definition:

requires_color: A boolean describing whether or not this logo definition requires color. If it is chosen to be drawn and it requires color on a color-disabled boot, drawer.lua will elect to use the default “orbbw” logo rather than the chosen logo.
graphic: A table of strings containing rows of text to be drawn to the screen.
shift: A table describing the x and y shift that should be applied to all elements should this logo be selected. This is typically used for shifting the menu and brand if an empty or minimal logo are selected.

CUSTOM BRANDS AND LOGOS

The brand and logo system is designed to allow brands and logos to be easily plugged in. When an unrecognized loader_brand or loader_logo are encountered, drawer.lua will attempt to include brand-${loader_brand}.lua or logo-${loader_logo}.lua respectively. These files are expected to call either drawer.addBrand() or drawer.addLogo() to add the requested branddef or logodef. drawer.lua will attempt to do another lookup for the requested brand or logo before falling back to one of the following:

drawer.default_brand: The default brand to be used if the requested brand cannot be located.
drawer.default_color_logodef: The default logodef to be used if an invalid logodef is requested and loader(8) has been configured to allow output of color.
drawer.default_bw_logodef: The default logodef to be used if either an invalid logodef has been requested, or a logodef has been requested that requires color and loader(8) has been configured to not output color.

FRAME STYLES

drawer.lua contains the definitions for the different frame styles that may be drawn around the menu. Frame styles define the characters drawn for horizontal lines, vertical aligns, and each of the four corner styles. The following keys may be defined for a frame style:

horizontal
vertical
top_left
bottom_left
top_right
bottom_right

Frame styles are currently defined in the table drawer.frame_styles indexed by the name used for loader_menu_frame. No API currently exists for manipulating this table indirectly.

Exported functions

The following functions are exported from drawer.lua:

drawer.addBrand(name, def): Add the brand definition described by def to the table of known brand definitions, indexed by name.
drawer.addLogo(name, def): Add the logo definition described by def to the table of known logo definitions, indexed by name.
drawer.drawscreen(menudef): Draws the logo, brand, menu frame, and the current menu as described in menudef, formatted as defined by menu.lua(8).

AUTHORS

The drawer.lua file was originally written by Pedro Souza <pedrosouza@FreeBSD.org>. Later work and this manual page was done by
Kyle Evans <kevans@FreeBSD.org>.