(gettext.info)The --style option

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9.11.3 The ‘--style’ option
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   The ‘--style=STYLE_FILE’ option specifies the style file to use when
colorizing.  It has an effect only when the ‘--color’ option is
effective.

   If the ‘--style’ option is not specified, the environment variable
‘PO_STYLE’ is considered.  It is meant to point to the user’s preferred
style for PO files.

   The default style file is
‘$prefix/share/gettext/styles/po-default.css’, where ‘$prefix’ is the
installation location.

   A few style files are predefined:
‘po-vim.css’
     This style imitates the look used by vim 7.

‘po-emacs-x.css’
     This style imitates the look used by GNU Emacs 21 and 22 in an X11
     window.

‘po-emacs-xterm.css’
‘po-emacs-xterm16.css’
‘po-emacs-xterm256.css’
     This style imitates the look used by GNU Emacs 22 in a terminal of
     type ‘xterm’ (8 colors) or ‘xterm-16color’ (16 colors) or
     ‘xterm-256color’ (256 colors), respectively.

You can use these styles without specifying a directory.  They are
actually located in ‘$prefix/share/gettext/styles/’, where ‘$prefix’ is
the installation location.

   You can also design your own styles.  This is described in the next
section.