Decode the protobuf wire format in Gleam!
Update example in readme
authored by
Gavin Morrow
and committed by
GitHub
(Sep 29, 2025, 6:58 AM EDT)
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README.md
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README.md
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```
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-->
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```gleam
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import protobuf_decode_gleam
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import option
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import protobuf_decode_gleam.{parse, read_varint}
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import protobuf_decode_gleam/decoders
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import gleam/option
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type Person {
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Person(id: Int, age: option.Option(Int), score: Int)
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Person(
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id: Int,
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age: option.Option(Int),
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score: Int,
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fav_nums: List(Int),
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)
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}
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fn person_decoder() -> Decoder(Person) {
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decode.optional(decoders.uint()),
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)
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use score <- decode.field(2, decoders.uint())
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use fav_nums <- decode.field(
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42,
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decoders.multiple(of: decoders.uint(), using: read_varint),
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)
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Person(id:, age:, score:) |> decode.success
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}
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pub fn main() -> Nil {
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// See the tests as well, they have decent examples.
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let path = "./path/to/person.pb"
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let assert Ok(bits) = file.read_bits(from: path)
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assert person
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== Person(
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id: 42,
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age: 150,
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score: option.Some(81_050),
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age: option.Some(150),
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score: 81_050,
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)
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}
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```