(a2ps.info)A prologue example

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8.6.3 A step by step example
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We strongly suggest our readers not to start from scratch, but to copy
one of the available styles (see the result of 'a2ps --list=prologues'),
to drop it in one of a2ps directories (say '$HOME/.a2ps', and to patch
it until you like it.

   Here, we will start from 'color.pro', trying to give it a funky look.

   Say you want the keywords to be in Helvetica, drawn in a flashy pink
on a light green.  And strong keywords, in Times Bold Italic in brown on
a soft Hawaiian sea green (you are definitely a fine art _amateur_).

   Then you need to look for 'k' and 'K':
     /k {
       false BG
       0 0 0.9 FG
     %Face: Keyword Courier bfs
       Show
     } bind def

     /K {
       false BG
       0 0 0.8 FG
     %Face: Keyword_strong Courier-Bold bfs
       Show
     } bind def

and turn it into:
     /k {
       0.2 1 0.2 true BG
       1 0.2 1 FG
     %Face: Keyword Helvetica bfs
       Show
     } bind def

     /K {
       0.4 0.2 0 true BG
       0.5 1 1 FG
     %Face: Keyword_strong Times-BoldItalic bfs
       Show
     } bind def

   Waouh!  It looks great!

   A bit trickier: let change the way the line numbers are printed.

   First, let's look for the font definition:
     %%BeginSetup
     % The font for line numbering
     /f# /Helvetica findfont bfs .6 mul scalefont def
     %%EndSetup

   Let it be in Times, twice bigger than the body font.
     %%BeginSetup
     % The font for line numbering
     /f# /Times-Roman findfont bfs 2 mul scalefont def
     %%EndSetup

   How about its foreground color?
     % Function print line number (<string> # -)
     /# {
       gsave
         sx cw mul 2 div neg 0 rmoveto
         f# setfont
         0.8 0.1 0.1 FG
         c-show
       grestore
     } bind def

   Let it be blue.  Now you know the process: just put '0 0 1' as 'FG'
arguments.