feature request: preamble support

[anuramat]

would be nice to have a way to eg prepend operator definitions to equations

[anuramat]

opened a pr: #20

[Thiago4532]

Can you give me an example on how would you use this?

[anuramat]

kinda like this:

{
  'Thiago4532/mdmath.nvim',
  dependencies = 'nvim-treesitter/nvim-treesitter',
  ft = 'markdown',
  opts = {
    preamble = [[
\DeclareMathOperator*{\argmin}{\arg\!\min}
\DeclareMathOperator*{\argmax}{\arg\!\max}

\newcommand{\defeq}{\mathrel{\mathop:}=}
\newcommand{\eqq}{\overset{?}{=}}
\newcommand{\eqe}{\overset{!}{=}}
      ]],
  },
},

although in my config I read it from a file, so maybe having that as an option (preamble_path ?) would make sense

[Chachi04]

This feature would be so useful feature, since I usually have custom commands like \R -> \mathbb{R}, \N -> \mathbb{N}, etc.

[mscott99]

I would also benefit from this.