Noob question: importing macros

[sneilan]

Hi,

Please forgive my ignorance :(

I’m trying to import the ncut macro inside of an hy repl.

venv) ➜  ~ git:(master) ✗ hy
hy 1.0a3+9.gc7b2f476 using CPython(default) 3.8.0 on Linux
=> (require hy.contrib.slicing)
=> 

This works.

=> hy.contrib.slicing.ncut
Traceback (most recent call last):
  File "stdin-222a9a4b746c50d241d288ddba2d0cb18a534790", line 1, in <module>
    hy.contrib.slicing.ncut
AttributeError: module 'hy.contrib.slicing' has no attribute 'ncut'
=> ncut
Traceback (most recent call last):
  File "stdin-cd1363eafa6303b9444a75839546c1dc3d87d9a5", line 1, in <module>
    ncut
NameError: name 'ncut' is not defined
=> (require [hy.contrib.slicing [ncut]])
Traceback (most recent call last):
  File "stdin-5391d0e05d9c589899a350d1c4d58047a5f1be75", line 1, in <module>
    (require [hy.contrib.slicing [ncut]])
  File "<stdin>", line 1
    (require [hy.contrib.slicing [ncut]])
             ^
hy.errors.HySyntaxError: parse error for pattern macro 'require': should have reached end of form: hy.models.List([
  hy.models.Symbol('hy.contrib.slicing'),
  hy.models.List([
    hy.models.Symbol('ncut')])])
=> 

Does not :(

Could anyone point me in the direction of a tutorial that shows how to use macros in the hy repl? Maybe I’m not understanding how this works :(

Thank you for anything ❤️❤️

[sneilan]

I just figured it out!

> (require hy.contrib.slicing [ncut])
=> ncut
Traceback (most recent call last):
  File "stdin-cd1363eafa6303b9444a75839546c1dc3d87d9a5", line 1, in <module>
    ncut
NameError: name 'ncut' is not defined
=> (ncut)
Traceback (most recent call last):
  File "stdin-7a275e3177d0e0fe8f6f46fd448f506d80969b9c", line 1, in <module>
    (ncut)
hy.errors.HyMacroExpansionError:
  File "<stdin>", line 1
    (ncut)
    ^----^
expanding macro ncut
  TypeError: ncut() missing 2 required positional arguments: 'seq' and 'key1'

It imports! :)

[scauligi]

Yup, we only just changed the import/require syntax as of 1.0a3, you no longer use the outer brackets when importing/requiring stuff from within a module!

[sneilan]

Yes! That's what stumped me. Thank you! :)