The colours of the people of a room.
An actor's own colour goes to other people's browsers, so only a plain
CSS colour passes (sanitize/1). An actor with no colour gets an index
into the theme's palette (index/1, 1 to 8, the same for a key in every
browser and node): the theme decides the colours, so Sumi and a dark mode
can choose their own (--issho-person-1 … --issho-person-8).
Summary
Functions
The palette index of a key, from 1 to 8.
The number of colours in a theme's palette.
The colour if it is a plain CSS colour, else nil.
Functions
@spec index(String.t()) :: pos_integer()
The palette index of a key, from 1 to 8.
iex> Issho.Color.index("user:4") in 1..8
true@spec palette_size() :: pos_integer()
The number of colours in a theme's palette.
The colour if it is a plain CSS colour, else nil.
iex> Issho.Color.sanitize("#2563eb")
"#2563eb"
iex> Issho.Color.sanitize("red; background: url(x)")
nil