THE FORMAT OF THEME FILES
-------------------------

A theme is a collection of attributes of various UI elements. Each 
theme is contained in a file with a "thm" extension.

Each line of a theme file, unless blank or preceded with "#" (which 
makes it a comment), is of the syntax:

  element_name = [fg_color | special] [, bg_color | special] [, special]

"color" may be any of:

  black      gray
  red        brightred
  green      brightgreen
  brown      yellow
  blue       brightblue
  magenta    brighmagenta
  cyan       brightcyan
  lightgray  white

(Because of terminal restrictions, those in the second column cannot 
serve as background colors).

"special" may be any of

  bold		+bold
  underline	+underline
  reverse	+reverse
  normal
  default

"default" stands for the default color of the terminal. This can be 
either the foreground or the background color, depending on where it's 
used.

There are tens of elements, but thanks to an inheritance mechanism it's 
only necessary to specify few of them. Those elements not specified in a 
theme file inherit their attributes from a predetermined "parent" 
element. This inheritance also takes place when only a background (or a 
foreground) color is missing.

The following is a list of the available UI elements and their descriptions.
The indentations show the hierarchical structure of the inheritance.

menu						pull-down menu color
 menu.frame					menu frames
 menu.selected					selected menu item
 menu.letter					item hot key
  menu.letter.selected (bg: menu.selected)	item hot key, when selected
 menu.indicator					menu indicators
  menu.indicator.selected (bg: menu.selected)	menu indicators, selected
 menubar					menubar
  scrollbar.thumb				the thumb of the scrollbar
  statusline					the status-line

edit						the main edit box
 dialogline					the dialog-line
 scrollbar					the scrollbar
 edit.failed-conversion				characters not represented
						in screen encoding.
 edit.control					control characters
						(usually U+0000 to U+0031)
 edit.eop					end of paragraph symbol
  edit.unicode-ls				Unicode line separator
  edit.tab					tab characters
 edit.explicit-bidi				explicit bidi marks
  edit.maqaf					Hebrew maqaf, when highlighted
  edit.nsm					non spacing marks (NSM)
   edit.nsm.hebrew				Hebrew NSM (niqqud)
    edit.nsm.cantillation			cantillation marks
   edit.nsm.arabic				Arabic NSM (harakat)
   edit.wide					wide Asian characters
 edit.trim					the trim symbol ("$")
  edit.wrap					the wrap symbol ("\")
 edit.selected					selected text
 edit.html-tag					highlighted HTML tags
 edit.emphasized				highlighted *text* and _text_
  edit.links					links in the User Manual
 edit.email-quote1				email quotes, level 1
  edit.email-quote2				email quotes, level 2
   edit.email-quote3				email quotes, level 3
    ...						...
     edit.email-quote9				email quotes, level 9