Change the colors

When output is directed to an ANSI terminal, zprint will colorize both code and structures output. It does this with a color map in the options map.

The default color map:

:color-map {:brace :red,
            :bracket :purple,
            :char :black,      ; Note Clojurescript difference below!
            :comma :none,
            :comment :green,
            :deref :red,
            :false :black,
            :fn :blue,
            :hash-brace :red,
            :hash-paren :green,
            :keyword :magenta,
            :nil :yellow,
            :none :black,
            :number :purple,
            :paren :green,
            :quote :red,
            :regex :black,
            :string :red,
            :symbol :black,
            :syntax-quote-paren :red
            :true :black,
            :uneval :magenta,
            :user-fn :black},

Note that in Clojurescript, you cannot set a unique :char color value, as things that return true from(char? ...) also return true from (string? ...), since in Clojurescript chars are simply single character strings. Due to this difference, the color value for :string takes precedence.

If you want to change the colors, simple remap something. For example, to change the color of parentheses from the default green to black (for only this call to zprint):

(czprint-fn defn {:color-map {:paren :black}})

You can include multiple ANSI sequences together:

(czprint-fn defn {:color-map {:none [:bright-black :italic]}})

You can of course change it permanently by placing the change (in this case {:color-map {:paren :black}}) in an options map that is used for configuration, like ~/.zprintrc.

The allowable colors are (including their ANSI codes for reference):

  {:off 0,
   :reset 0,
   :bold 1,
   :faint 2,
   :italic 3,
   :underline 4,
   :blink 5,
   :reverse 7,
   :hidden 8,
   :strike 9,
   :normal 22,
   :italic-off 23,
   :underline-off 24,
   :blink-off 25,
   :reverse-off 27,
   :hidden-off 28,
   :strike-off 29,
   :black 30,
   :none 30,
   :red 31,
   :green 32,  
   :yellow 33, 
   :blue 34,   
   :magenta 35,
   :purple 35,
   :cyan 36, 
   :white 37,
   :xsf 38,
   :back-black 40,  
   :back-red 41,    
   :back-green 42,  
   :back-yellow 43, 
   :back-blue 44,    
   :back-magenta 45, 
   :back-purple 45,
   :back-cyan 46,
   :back-white 47,
   :bright-black 90,
   :bright-red 91,
   :bright-green 92,
   :bright-yellow 93,
   :bright-blue 94,
   :bright-magenta 95,
   :bright-purple 95,
   :bright-cyan 96,
   :bright-white 97,
   :back-bright-black 100,
   :back-bright-red 101,
   :back-bright-green 102,
   :back-bright-yellow 103,
   :back-bright-blue 104,
   :back-bright-magenta 105,
   :back-bright-purple 105,
   :back-bright-cyan 106,
   :back-bright-white 107}

Unevaluated code

When zprint finds the symbols #_ that mark unevaluated code, it changes the color map to:

:uneval {:color-map {:brace :yellow,
                     :bracket :yellow,
                     :char :magenta,  ; not available in Clojurescript, see above
                     :comma :none,
                     :comment :green,
                     :deref :yellow,
                     :false :yellow,
                     :fn :cyan,
                     :hash-brace :yellow,
                     :hash-paren :yellow,
                     :keyword :yellow,
                     :nil :yellow,
                     :none :yellow,
                     :number :yellow,
                     :paren :yellow,
                     :quote :yellow,
                     :regex :yellow,
                     :string :yellow,
                     :symbol :cyan,
                     :syntax-quote-paren :yellow,
                     :true :yellow,
                     :uneval :magenta,
                     :user-fn :cyan}},

This highlights the unevaluated code. You can change any of these colors as well.

There is a style, :dark-color-map which sets both the :color-map and the :uneval {:color-map ...} to colors which are visible when using a dark background. These may not be your favorite color choices, but at least things should be visible, allowing you to fine-tune the colors to better meet your preferences.

If you wish to change the colors permanently, you can place these options maps anywhere an options map is accepted.