c/rust · by testeronious@lemmy.world · 2y

`unfmt`: A compile-time pattern matching library that reverses the interpolation process of `format!`.

58 points · 9 comments · view on lemmy.world

9 Comments

livingcoder@programming.dev · 12 pts · 2y

How does it handle multiple potential outcomes? Example: unformat!("a {} b {} c", "a x b b y c") Would it return Some(("x b", "y")) or Some(("x", "b y"))?

voklen@programming.dev · 9 pts · 2y (2 replies)

I love the concept! I recently wanted something just like this for a Flutter app I was making to parse a filename into a user defined format i.e.

2024-04-12.txt with %Y-%M-%D.txt to {year: 2024, month: 04, day: 12}

I'll certainty be using this the next time I need anything like that in Rust though.

fhoekstra@programming.dev · 7 pts · 2y (1 reply)

Off-topic, but I recognise your name. Thank you for the Daily Diary App! I'm a huge fan, I use it every day for my gratitude routine.

voklen@programming.dev · 4 pts · 2y

Wow, I've never had anyone recognise my name for something I've made! Thank you so much and I'm glad you're enjoying it 😁

myotherself@lemmings.world · 7 pts · 2y

That's just brilliant.

avonarret1@programming.dev · 2 pts · 2y

That’s really clever. I want to use it even though I haven’t been Rust‘ing lately

onlinepersona@programming.dev · -1 pts · 2y (2 replies)

What am I missing? Seems like it just puts the parameter in Some?

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Ephera@lemmy.ml · 21 pts · 2y (1 reply)

You must've read that wrong.

The first example, but formatted differently:

let value = "My name is Rho.";
let result = unformat!("My {} is {}.", value);

Now, result contains:

Some(("name", "Rho"))

...because the words "name" and "Rho" in value happened to be at the position of the {}-slots in the unformat!()-pattern.

onlinepersona@programming.dev · 5 pts · 2y

Oh yeah! Thanks. It's been a long day.

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