.. _Customization:

=============
Customization
=============

Aliases
=======

If you use an option of Ducker very often, you
should consider making a shortcut for it in your shell.
In Bash-like shells, you can make aliases. Let's say we want
to add an option to search for articles in Wikipedia;
we can create a Bash alias for that.

    ``alias wikipedia='ducker \!w'``

After that, calling ``wikipedia`` in the shell will open the main
page of wikipedia, and calling ``wikipedia free software``
would open the `"Free software" article from wikipedia`_.
Note that we're using `DuckDuckGo bangs`_ and that the
exclamation mark (!) must be escaped in Bash. To make Bash
remember your alias for your next sessions you must add
it to your ``.bashrc`` file.

.. _colors-of-the-interactive-mode:

Colors of the interactive mode
==============================

Ducker allows you to customize the color scheme via a six-letter string,
reminiscent of BSD LSCOLORS. The six letters represent the colors of:

- indices,
- titles,
- URLs,
- nothing (may probably be used in a later version),
- abstracts,
- and prompts

respectively. The six-letter string is passed in either as the argument
to the --colors option.

We offer the following colors/styles:

 ======   =================================================
 Letter   Color/Style
 ======   =================================================
 a        black
 b        red
 c        green
 d        yellow
 e        blue
 f        magenta
 g        cyan
 h        white
 i        bright black
 j        bright red
 k        bright green
 l        bright yellow
 m        bright blue
 n        bright magenta
 o        bright cyan
 p        bright white
 A-H      bold version of the lowercase-letter color
 I-P      bold version of the lowercase-letter bright color
 x        normal
 X        bold
 y        reverse video
 Y        bold reverse video
 ======   =================================================

The default colors string is GKlgxy, which stands for

- bold bright cyan indices
- bold bright green titles
- bright yellow URLs
- cyan metadata/publishing info
- normal abstracts
- reverse video prompts

Note that:

- Bright colors (implemented as \x1b[90m - \x1b[97m) may not be available in all color-capable terminal emulators;
- Some terminal emulators draw bold text in bright colors instead;
- Some terminal emulators only distinguish between bold and bright colors via a default-off switch.

Please consult the manual of your terminal emulator as well as
https://en.wikipedia.org/wiki/ANSI_escape_code for details.

.. _DuckDuckGo bangs: https://duckduckgo.com/bang
.. _"Free software" article from wikipedia: https://en.wikipedia.org/wiki/Free_software