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add-color(2)
add-color(2)add-color - Create a new color
add-color-scheme - Create a new color scheme
add-color "col-no" "red" "green" "blue"
n add-color-scheme "schemeNum" "fore" "back" "current-fore" "current-back"
add-color creates a new color and inserts it into MicroEmacs '99 colors table, where red, green and blue are the color components and col-no is the MicroEmacs '99 color table number. The color table contains 256 entries indexed by col-no in the range 0-255.
On some platforms (DOS and UNIX termcap) the number of colors is physically limited by the hardware to less than 256 (typically 16), in this case all 256 colors can be defined and for each created color the closest system color is used.
By default, only color 0 (white) and 1 (black) are defined. Once created, the colors may be used to create color schemes, this is the sole use of colors.
add-color may be used to modify an existing col-no index by re-assignment, the existing color definition is over-written with the new color definition. add-color-scheme creates a color scheme entry used by hilight(2), screen-poke(2), osd(2) and variables such as $global-scheme(5), $buffer-scheme(5), $ml-scheme(5).
The command takes an index number "schemeNum" and eight color values (defined by add-color(2)) alternating between foreground and background colors. The 8 colors represent the 4 color paired states of foreground and background that may appear in a text buffer. The paired states correspond to current and selected lines (or permutations thereof). If an argument n is given to the command then schemeNum is set to a duplicate of the nth scheme, no other arguments are required.
schemeNum is the identifying index that is used to recognize the scheme. By default only two color schemes are defined at initialization, they are a monochrome scheme and inverse scheme with indices 0 and 1 using white as foreground and black as background, selected text is inverted. When defining a color scheme, if an existing schemeNum index is used then that scheme is modified.
The next eight arguments must be given, they specify foreground and background color pairs for the four different situations, as follows:-
Default
Current
Selected
Current-selected
The following 8 arguments set up UNIX termcap fonts and are optional, any missing arguments are defaulted to 0. Each argument is a bitmask indicating which font should be enabled, where each bit is as follows:
0x01 Enable bold font.
0x02 Enable italic font.
0x04 Enable light font.
0x08 Enable reverse font.
0x10 Enable underlining.
Normally only the foreground value is used, i.e. the first, third, fifth and seventh values. But screen-poke(2) can be used to draw reversed color scheme in which case the background values are used.
The color palette is typically created at start-up via the configuration file schemeX.emf. These files are not easily read as they are automatically generated via the scheme-editor(3) dialog. A more readable form of "schemed.emf" would be as follows:-
; Standard colors add-color &set .white 0 200 200 200 add-color &set .black 1 0 0 0 add-color &set .red 2 200 0 0 add-color &set .green 3 0 200 0 add-color &set .yellow 4 200 200 0 add-color &set .blue 5 0 0 200 add-color &set .magenta 6 200 0 200 add-color &set .cyan 7 0 200 200 ; Light colors add-color &set .lwhite 8 255 255 255 add-color &set .lblack 9 75 75 75 add-color &set .lred 10 255 0 0 add-color &set .lgreen 11 0 255 0 add-color &set .lyellow 12 255 255 0 add-color &set .lblue 13 0 0 255 add-color &set .lmagenta 14 255 0 255 add-color &set .lcyan 15 0 255 255 ; Selection color add-color &set .sel-col 16 91 78 131 ; Set the required cursor-color set-variable $cursor-color .col12 ; Set up the standard schemes for the text, mode line message line, scroll bar and osd. add-color-scheme $global-scheme .white .black .lwhite .black ... ... .white .sel-col .lwhite .sel-col 0 8 1 9 8 0 9 1 add-color-scheme $ml-scheme .white .black .lwhite .black ... ... .white .sel-col .lwhite .sel-col 0 8 1 9 8 0 9 1 add-color-scheme $mode-line-scheme .white .red .lwhite .lred ... ... .white .red .lwhite .red 8 0 9 1 0 8 1 9 add-color-scheme $scroll-bar-scheme .white .lblack .lwhite .lblack ... ... .lblack .white .lblack .lwhite 8 0 9 1 0 8 1 9 . .
Color schemes can be created and altered using the scheme-editor(3) dialog.
The existence of a color or scheme index is checked as each entry is submitted, therefore any color or scheme used must have been previously been created, otherwise a default value is substituted.
Changing any existing color definitions causes all references to the color from a scheme to adopt the new color.
Changing any existing color-scheme definitions changes the rendered color of any hilight(2) etc., that was using that color-scheme.
A -ve color scheme value (i.e. -n) uses the previous 'n'th entry that is defined in the color block. i.e. if current-fore was specified as -2 then it would inherit the fore field color.
Not all UNIX terminals support all the above fonts.
On some telnet packages color is not directly supported and some of the termcap display attributes such as bold and italic are represented by a color (e.g. italic text is shown in green). Using this translation it is possible to achieve reasonable color support on a VT100 terminal - it is a little awkward but is worth while if you have to use this type of connection frequently.
scheme-editor(3), change-font(2), hilight(2), screen-poke(2), $buffer-hilight(5), $cursor-color(5), $global-scheme(5), $ml-scheme(5), $osd-scheme(5), $mode-line-scheme(5), $scroll-bar-scheme(5), $system(5).
(c) Copyright JASSPA 1999
Last Modified: 1999/04/24
Generated On: 1999/12/01