Show HN: SHML (shell markup language)

Some remarks:

I doubt if it is needed to launch a sub-process for each markup directive. This is fine for small output, but will slow down processing of larger chunks of text. I would be interested in a bash solution based on associative arrays.

As an example, one might want to look at the zsh implementation of the colors script in the main distribution[0], which makes colors available as an associative array:

    # Set once in shell init script:
    autoload -U colors && colors
    # And use it anywhere:
    print $fg[blue]hello colorful world!$fg[reset]

$(title "header") could be cool, outputting " header$(br)------"

An alias for \r could be nice, to go with $(br).

Unrelated, I'm pretty sad that there hasn't been further work in packaging shell extensions like this. Most of it is adhoc, and people usually tend to stick to `curl | bash` (I'm guilty of this as well with dokku and other OS projects).