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Add minigrep example program

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This commit is contained in:
Timothy Warren 2019-01-31 16:20:46 -05:00
parent 9fec8ed7f9
commit a05a4eb790
7 changed files with 196 additions and 52 deletions
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1
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@ -20,6 +20,7 @@
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5
.idea/rust.iml generated
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@ -78,6 +78,10 @@
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@ -89,6 +93,7 @@
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105
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7
minigrep/Cargo.toml Normal file
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@ -0,0 +1,7 @@
[package]
name = "minigrep"
version = "0.1.0"
authors = ["Timothy Warren <twarren@nabancard.com>"]
edition = "2018"
[dependencies]

9
minigrep/poem.txt Normal file
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@ -0,0 +1,9 @@
I'm nobody! Who are you?
Are you nobody, too?
Then there's a pair of us - don't tell!
They'd banish us, you know.
How dreary to be somebody!
How public, like a frog
To tell your name the livelong day
To an admiring bog!

101
minigrep/src/lib.rs Normal file
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@ -0,0 +1,101 @@
use std::env;
use std::error::Error;
use std::fs;
pub struct Config {
pub query: String,
pub filename: String,
pub case_sensitive: bool,
}
impl Config {
pub fn new(args: &[String]) -> Result<Config, &'static str> {
if args.len() < 3 {
return Err("not enough arguments");
}
let query = args[1].clone();
let filename = args[2].clone();
let case_sensitive = env::var("CASE_INSENSITIVE").is_err();
Ok(Config { query, filename, case_sensitive })
}
}
pub fn run(config: Config) -> Result<(), Box<dyn Error>> {
// The ? operator passes the error back to the caller.
let contents = fs::read_to_string(config.filename)?;
let results = if config.case_sensitive {
search(&config.query, &contents)
} else {
search_case_insensitive(&config.query, &contents)
};
for line in results {
println!("{}", line);
}
Ok(())
}
fn search<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
let mut results = Vec::new();
for line in contents.lines() {
if line.contains(query) {
results.push(line)
}
}
results
}
fn search_case_insensitive<'a>(query: &str, contents: &'a str) -> Vec<&'a str> {
let query = query.to_lowercase();
let mut results = Vec::new();
for line in contents.lines() {
if line.to_lowercase().contains(&query) {
results.push(line)
}
}
results
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn case_sensitive() {
let query = "duct";
let contents = "\
Rust:
safe, fast, productive.
Pick three.
Duct tape.";
assert_eq!(
vec!["safe, fast, productive."],
search(query, contents)
);
}
#[test]
fn case_insensitive() {
let query = "rUsT";
let contents = "\
Rust:
safe, fast, productive.
Pick three.
Trust me.";
assert_eq!(
vec!["Rust:", "Trust me."],
search_case_insensitive(query, contents)
);
}
}

20
minigrep/src/main.rs Normal file
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@ -0,0 +1,20 @@
use std::env;
use std::process;
use minigrep;
use minigrep::Config;
fn main() {
// collect turns an iterator into a collection
let args: Vec<String> = env::args().collect();
let config = Config::new(&args).unwrap_or_else(|err| {
eprintln!("Problem parsing arguments: {}", err);
process::exit(1);
});
if let Err(e) = minigrep::run(config) {
eprintln!("Application error: {}", e);
process::exit(1);
}
}