mirror of https://github.com/rust-lang/book
51 lines
1020 B
Rust
51 lines
1020 B
Rust
use std::env;
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use std::fs;
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use std::process;
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// ANCHOR: here
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fn main() {
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// --snip--
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// ANCHOR_END: here
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let args: Vec<String> = env::args().collect();
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let config = Config::build(&args).unwrap_or_else(|err| {
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println!("Problem parsing arguments: {}", err);
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process::exit(1);
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});
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// ANCHOR: here
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println!("Searching for {}", config.query);
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println!("In file {}", config.filename);
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run(config);
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}
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fn run(config: Config) {
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let contents = fs::read_to_string(config.filename)
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.expect("Something went wrong reading the file");
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println!("With text:\n{}", contents);
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}
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// --snip--
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// ANCHOR_END: here
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struct Config {
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query: String,
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filename: String,
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}
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impl Config {
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fn build(args: &[String]) -> Result<Config, &'static str> {
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if args.len() < 3 {
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return Err("not enough arguments");
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}
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let query = args[1].clone();
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let filename = args[2].clone();
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Ok(Config { query, filename })
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}
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}
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