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feat: add maybe and result thread macros #1403

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feat: add maybe and result thread macros #1403

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20 changes: 20 additions & 0 deletions core/ControlMacros.carp
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Original file line number Diff line number Diff line change
Expand Up @@ -46,6 +46,26 @@ Example:
(defmacro -> [:rest forms]
(thread-first-internal forms))

(doc ?->
("threads the value contained in a maybe through the following " false)
"forms iff, the Maybe is a Just."
""
"Returns Nothing if the Maybe is Maybe.Nothing.")
(defmacro ?-> [maybe :rest forms]
(list 'match maybe
(list 'Maybe.Just 'v) (list 'Maybe.Just (thread-first-internal (cons 'v forms)))
'_ (list 'Maybe.Nothing)))

(doc /->
("threads the value contained in a Result through the following" false)
"forms iff, the Result is a Success"
""
"Returns the erorr if the Result is Result.Error.")
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@martinjungblut martinjungblut Mar 25, 2022

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There's a typo here: erorr.

(defmacro /-> [result :rest forms]
(list 'match result
(list 'Result.Success 'v) (list 'Result.Success (thread-first-internal (cons 'v forms)))
'y 'y))

(doc --> "threads the first form through the following ones, making it the last
argument.

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