feat: Add "low color" mode

[twolodzko]

In some color configurations, eza uses a lot of colors for different items in the output. I personally find it distracting (mostly the file permissions in -l mode). I could use --color never, but I wouldn't mind if eza colored only the file and directory names as ls. I could also use EXA_COLORS to individually turn off each of the components, but this is not well documented and needs individually blacklisting each of them. I'd love to have something like --color ls which just uses the same colors as ls does, not more.

[PThorpe92]

I think this is a good combination of #139 and some of #245

To be able to offer some custom themes in a config file would be awesome :D

[bew]

eza uses a lot of colors for different items in the output. I personally find it distracting

I fully agree, it's the first things I changed when switching to exa some long time ago.

Here is the theme I use:

# Config eza/exa colors to shades of grey instead of a distractful bright colors
EXA_COLORS=""
EXA_COLORS+="da=38;5;243:" # darker
EXA_COLORS+="uu=38;5;239:gu=38;5;239:" # darker username & group
EXA_COLORS+="sn=38;5;29:sb=38;5;100:" # darker and better contrast for file size
# Darker permissions (shades of grey)
EXA_COLORS+="ur=38;5;240:uw=38;5;244:ux=38;5;248:ue=38;5;248:" # user permissions
EXA_COLORS+="gr=38;5;240:gw=38;5;244:gx=38;5;248:" # group permissions
EXA_COLORS+="tr=38;5;240:tw=38;5;244:tx=38;5;248:" # other permissions
EXA_COLORS+="xa=38;5;24:" # xattr marker ('@')
EXA_COLORS+="xx=38;5;240:" # punctuation ('-')
export EXA_COLORS

Which looks like this:

I didn't do any changes for the filenames colors, I might in the future ¯_(ツ)_/¯

[bew]

I edited my theme to have distinct colors for file size of different magnitudes, by replacing sn/sb config line with:

# Color file sizes by order of magnitude
EXA_COLORS+="nb=38;5;239:"                #  0  -> <1KB : grey
EXA_COLORS+="nk=38;5;29:uk=38;5;100:"     # 1KB -> <1MB : green
EXA_COLORS+="nm=38;5;26:um=38;5;32:"      # 1MB -> <1GB : blue
EXA_COLORS+="ng=38;5;130:ug=38;5;166;1:"  # 1GB -> <1TB : orange
EXA_COLORS+="nt=38;5;160:ut=38;5;197;1:"  # 1TB -> +++  : red

I think it looks pretty nice 😃 ✨

test files were created with truncate -s 123g 3_giga for example to simulate file sizes