Colored output
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The ability to graphically enhance some part of the produced output has been added to improve readability. Among others, error, warning and info message prefixes can be colored as well as modulepath, module alias and symbolic version.
Color mode can be set to never, auto or always. When color mode is set to auto, output is colored only if the standard error output channel is attached to a terminal.
Default color mode could be controlled at configure time with the --enable-color and the --disable-color option, which respectively correspond to the auto and never color mode. This default mode could be superseded with the MODULES_COLOR environment variable and the --color command-line switch.
Color to apply to each element can be controlled with the MODULES_COLORS environment variable or the --with-dark-background-colors and --with-light-background-colors configure options. These variable and options take as value a colon-separated list in the same fashion LS_COLORS does. In this list, output item that should be highlighted is designated by a key which is associated to a Select Graphic Rendition (SGR) code.
The MODULES_TERM_BACKGROUND environment variable and the --with-terminal-background configure option help Modules to determine if the color set for dark background or the color set for light background should be used to color output in case no specific color set is defined with the MODULES_COLORS variable.
Output items able to be colorized and their relative key are: highlighted element (hi), debug information (db), tag separator (se); Error (er), warning (wa), module error (me) and info (in) message prefixes; Modulepath (mp), directory (di), module alias (al), module symbolic version (sy), module default version (de) and modulefile command (cm).
For instance the default color set for a terminal with dark background is defined to hi=1:db=2:se=2:er=91:wa=93:me=95:in=94:mp=1;94:di=94:al=96:sy=95:de=4:cm=92
When colored output is enabled and a specific graphical rendition is defined for module default version, the default symbol is omitted and instead the defined graphical rendition is applied to the relative modulefile. When colored output is enabled and a specific graphical rendition is defined for module alias, the @ symbol is omitted.
