Thuna

https://emacs.ch/@thuna_cing

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npub1n2g6uldhyc3t3qwhh489vlyzj9fvfkpu6y7smerkwfn4sdemmu2qgupn84

NIP-05 Address

thuna_cing_at_emacs.ch@momostr.pink

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nprofile1qqsf4ydw0kmjvg4cs8tm6njk0jpfz5kymq7dz0gdu3m8ye6cxuaa79qrp537s

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npub1n2g6uldhyc3t3qwhh489vlyzj9fvfkpu6y7smerkwfn4sdemmu2qgupn84

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Last Notes

2024-05-31 21:49:31

- reply

Indentation is there to clarify what is happening. You would not look at
(loop for x below 3
if (oddp x)
unless (zerop x)
collect x
else collect 'a)
and think that the else clause is a part of the unless clause, but it is. This is because LOOP is just *not like lisp*, the rules of how things relate are not transferrable.
Indentation matters not because it literally changes the scope but because it informs your perspective of what the code is doing. You don't *need* indentation when working with lisp, indeed, you can have everything be flush with the beginning of the line, but you still indent the code in a strict and consistent manner because that helps you understand what's happening without counting parentheses. It's the same for LOOP, except instead of counting parentheses you're counting conditional clauses.

2024-05-31 03:12:26

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It's broken on 30.0.50 as well, both the :else not being indented with :collect on its own line and it being too indented when :collect is immediately following the :if.

2024-05-31 02:59:53

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No, :when or :unless don't allow :else clauses so it's unambiguous in this case.

2024-05-31 02:48:47

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Well, kind of.
Yes, if you had an `:else' followed by a `:do' followed by some form, that form would be indented twice (with two spaces per indent).
The code in the image isn't indented properly though: `:else' should be aligned with `:if', the form after `:do' should be indented by two spaces, and the second form after `:do' is an error, though even if it wasn't it still wouldn't be a part of `:do' so it would be dedented.

2024-05-31 02:36:46

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Sorry, I am not really following. What do you mean by "if you had multiple lines"?

2024-05-31 02:29:10

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I agree that the loop is a much better choice than the alternatives in this scenario.
(Also, I am not fully sure what the order of execution of the `for' and `until' clauses are but the code in the image might be discarding the last row.)

2024-05-31 02:16:45

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I guess I would prefer B (with if and else aligned) but I don't usually write complicated loop logic so the bigger deal for me is the indentation of lines which don't start with a loop keyword; any rule which has those indented is good in my eyes.