Set colors as a triplet of HSL numbers (without a prefix)

[eugenesvk]

Thanks to Wez It's now possible (in WezTerm nightly) to enter colors in a more convenient HSL scheme

• "hsl: 0 0 98" (very light gray) rather than the ugly hex
• "#fafafa"

However, you need to specify the hsl: prefix for every color.
Below is a lua function that allows you to skip the prefix and just enter a triplet of numbers:

• "0 0 98"
  (you can also mix and match this with the old hex "#fafafa" so you don't have to replace all the current colors with their HSL values)!

The snippet requires a configuration where you set a col table in a separate module and then add it,
see this example for more details

• requires a table merging function from mystdlib.lua
• requires merging all module tables like shown in this wezterm.lua

It works by recursively checking all the values and if it matches a pattern of a triplet of #s, it appends the given colorScheme prefix (should only be set to "hsl") for you

-- this would be part of a https://github.com/bew/dotfiles/blob/main/gui/wezterm/cfg_bew_colors.lua file
local col        	= {}
local colorScheme	= "hsl:"                	-- treat all triplet numbers as HSL
local reTriplet  	= "^%s*%d+%s*%d+%s*%d+$"	-- pattern matching a triplet of #s

col.background	= "  0   0   0"
col.cursor_bg 	= "193 100  50"
-- ... add all other colors in the simplest form possible — just 3 HSL numbers without any prefixes

string.endswith = function(self, str)
  return self:find(str .. '$') ~= nil
end
string.trim = function(self)
  return self:match("^%s*(.-)%s*$")
end

local function addColorPrefix(tab, prefix_user)
  if prefix_user:endswith(':') then prefix = prefix_user
  else                              prefix = prefix_user .. ":" end
  if type(tab) ~= "table" then return end
  for k,v in pairs(tab) do
    if     type(v) == "table" then               -- make it recursive
      addColorPrefix(v, prefix)
    elseif type(v) == "string" then
      if   v:match(reTriplet) then               -- add a prefix if a triplet of #s
        tab[k] = prefix .. v
      end
    end
  end
end

addColorPrefix(col, colorScheme)

return col