Either in Atom's package manager, or with apm:
apm install atom-calca
The calca parser works currently only on
.calca files in Markdown code blocks.
It also uses
language-ghm grammar to do Markdown syntax highlighting.
Check the examples/test.calca file for working examples.
MIT. Read the LICENSE.md.
Good catch. Let us know what about this package looks wrong to you, and we'll investigate right away.