init simple project that reads a file, generates a random lowercase character and writes counts so far to a file
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/target
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Generated
+133
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# This file is automatically @generated by Cargo.
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@@ -0,0 +1,7 @@
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[package]
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name = "char-counter"
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version = "0.1.0"
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edition = "2024"
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[dependencies]
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rand = "0.8"
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+47
@@ -0,0 +1,47 @@
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use std::fs;
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use rand::rngs::OsRng;
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use rand::Rng;
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fn random_lower_char(rng: &mut OsRng) -> u8 {
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rng.gen_range(0..25)
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}
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fn serialize_data(data: &[u32]) -> String {
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println!("serializing...");
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let mut serialization = String::new();
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for (i, count) in data.iter().enumerate() {
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let c = (i as u8 + 97) as char;
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let s = format!("{} {}\n", c, count.to_string());
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serialization.push_str(&s)
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}
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// only stack object (ptr, len, capacity) is copied on the way out
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serialization
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}
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fn main() {
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// considered using mutable static array for data
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// but that requires unsafe, so we just use non-static memory
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let mut data : [u32; 26] = [0; 26];
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// deserialize file contents into data structure
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if let Ok(contents) = fs::read_to_string("state.txt") {
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println!("deserializing...");
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for line in contents.split('\n') {
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if let Some((letter, val)) = line.split_once(' ') {
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let index = (letter.chars().next().unwrap() as u32) - 97; // todo: handle failure
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let count = val.parse::<u32>().unwrap(); // todo: handle failure
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data[index as usize] = count;
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}
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}
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}
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// generate random char and give to data structure
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let mut rng = OsRng;
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let index = random_lower_char(&mut rng) as usize;
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data[index] += 1;
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// write data structure to file
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let s_data = serialize_data(&data);
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fs::write("state.txt", s_data).expect("Should be able to write to `state.txt`");
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println!("done")
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}
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