Add drawer.lua(8)
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Kyle Evans
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stand/lua/drawer.lua.8
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stand/lua/drawer.lua.8
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.\"
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.\" SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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.\"
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.\" Copyright (c) 2018 Kyle Evans <kevans@FreeBSD.org>
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 19, 2018
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.Dt DRAWER.LUA 8
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.Os
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.Sh NAME
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.Nm drawer.lua
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.Nd FreeBSD menu/screen drawer module
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.Sh DESCRIPTION
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.Nm
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contains functionality for drawing and manipulating the menu, logo, and brand
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to the screen.
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.Pp
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Before using the functionality provided by
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.Nm ,
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it must be included with a statement such as the following:
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.Pp
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.Dl local drawer = require("drawer")
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.Ss BRAND DEFINITIONS
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Brand definitions describe a
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.Dq brand ,
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traditionally drawn above the menu.
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The exact position may be controlled by using the
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.Xr loader.conf 5
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variables
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.Va loader_brand_x
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and
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.Va loader_brand_y .
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The following keys may be defined for a brand definition:
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.Bl -tag -width ".Ic Graphic" -offset indent
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.It Ic graphic
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A table of strings containing rows of text to be drawn to the screen.
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.El
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.Ss LOGO DEFINITIONS
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Logo definitions describe a
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.Dq logo ,
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traditionally to the right of the menu.
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The exact position may be controlled by using the
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.Xr loader.conf 5
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variables
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.Va loader_logo_x
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and
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.Va loader_logo_y .
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The following keys may be defined for a logo definition:
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.Bl -tag -width ".Ic requires_color" -offset indent
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.It Ic requires_color
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A boolean describing whether or not this logo definition requires color.
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If it is chosen to be drawn and it requires color on a color-disabled boot,
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.Nm
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will elect to use the default
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.Dq orbbw
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logo rather than the chosen logo.
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.It Ic graphic
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A table of strings containing rows of text to be drawn to the screen.
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.It Ic shift
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A table describing the
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.Va x
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and
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.Va y
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shift that should be applied to all elements should this logo be selected.
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This is typically used for shifting the menu and brand if an empty or minimal
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logo are selected.
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.El
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.Ss CUSTOM BRANDS AND LOGOS
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The brand and logo system is designed to allow brands and logos to be easily
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plugged in.
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When an unrecognized
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.Ev loader_brand
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or
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.Ev loader_logo
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are encountered,
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.Nm
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will attempt to include
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.Pa brand-${loader_brand}.lua
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or
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.Pa logo-${loader_logo}.lua
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respectively.
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These files are expected to call either
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.Fn drawer.addBrand
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or
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.Fn drawer.addLogo
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to add the requested branddef or logodef.
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.Nm
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will attempt to do another lookup for the requested brand or logo before falling
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back to one of the following:
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.Bl -tag -width ".Ic drawer.default_color_logodef" -offset indent
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.It Ic drawer.default_brand
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The default brand to be used if the requested brand cannot be located.
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.It Ic drawer.default_color_logodef
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The default logodef to be used if an invalid logodef is requested and
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.Xr loader 8
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has been configured to allow output of color.
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.It Ic drawer.default_bw_logodef
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The default logodef to be used if either an invalid logodef has been requested,
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or a logodef has been requested that requires color and
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.Xr loader 8
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has been configured to not output color.
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.El
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.Ss FRAME STYLES
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.Nm
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contains the definitions for the different frame styles that may be drawn around
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the menu.
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Frame styles define the characters drawn for horizontal lines, vertical aligns,
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and each of the four corner styles.
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The following keys may be defined for a frame style:
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.Bl -bullet -width ""
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.It
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horizontal
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.It
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vertical
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.It
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top_left
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.It
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bottom_left
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.It
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top_right
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.It
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bottom_right
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.El
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Frame styles are currently defined in the table
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.Ic drawer.frame_styles
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indexed by the name used for
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.Ev loader_menu_frame .
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No API currently exists for manipulating this table indirectly.
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.Ss Exported functions
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The following functions are exported from
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.Nm :
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.Bl -tag -width hook.registerType -offset indent
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.It Fn drawer.addBrand name def
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Add the brand definition described by
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.Fa def
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to the table of known brand definitions, indexed by
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.Fa name .
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.It Fn drawer.addLogo name def
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Add the logo definition described by
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.Fa def
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to the table of known logo definitions, indexed by
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.Fa name .
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.It Fn drawer.drawscreen menudef
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Draws the logo, brand, menu frame, and the current menu as described in
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.Fa menudef ,
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formatted as defined by
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.Xr menu.lua 8 .
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.El
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.Sh SEE ALSO
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.Xr menu.lua 8
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.Sh AUTHORS
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The
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.Nm
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file was originally written by
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.An Pedro Souza Aq Mt pedrosouza@FreeBSD.org .
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Later work and this manual page was done by
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.An Kyle Evans Aq Mt kevans@FreeBSD.org .
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