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34 lines
861 B
Plaintext
34 lines
861 B
Plaintext
app "echo"
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packages { pf: "cli-platform/main.roc" }
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imports [pf.Stdin, pf.Stdout, pf.Task.{ Task }]
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provides [main] to pf
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main : Task {} []
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main =
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_ <- Task.await (Stdout.line "🗣 Shout into this cave and hear the echo! 👂👂👂")
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Task.loop {} \_ -> Task.map tick Step
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tick : Task.Task {} []
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tick =
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shout <- Task.await Stdin.line
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Stdout.line (echo shout)
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echo : Str -> Str
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echo = \shout ->
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silence = \length ->
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spaceInUtf8 = 32
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List.repeat spaceInUtf8 length
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shout
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|> Str.toUtf8
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|> List.mapWithIndex
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(\_, i ->
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length = (List.len (Str.toUtf8 shout) - i)
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phrase = (List.split (Str.toUtf8 shout) length).before
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List.concat (silence (if i == 0 then 2 * length else length)) phrase)
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|> List.join
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|> Str.fromUtf8
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|> Result.withDefault ""
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