Snippet from https://play.nim-lang.org

playground.nim

macro loadTerms(): untyped =
    result = newNimNode(nnkStmtList)
    result.add(quote do:
        var KEYMAPSTRING_TABLE = initTable[string, string]()
    )

    for term in walkFiles("term/*.txt"):
        result.add(quote do:
            KEYMAPSTRING_TABLE[term.splitFile().name] = staticRead(term)
        )
loadTerms()