diff options
Diffstat (limited to 'src/doc/book/listings/ch12-an-io-project/listing-12-12')
5 files changed, 99 insertions, 0 deletions
diff --git a/src/doc/book/listings/ch12-an-io-project/listing-12-12/Cargo.lock b/src/doc/book/listings/ch12-an-io-project/listing-12-12/Cargo.lock new file mode 100644 index 000000000..88bf82d16 --- /dev/null +++ b/src/doc/book/listings/ch12-an-io-project/listing-12-12/Cargo.lock @@ -0,0 +1,6 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "minigrep" +version = "0.1.0" + diff --git a/src/doc/book/listings/ch12-an-io-project/listing-12-12/Cargo.toml b/src/doc/book/listings/ch12-an-io-project/listing-12-12/Cargo.toml new file mode 100644 index 000000000..64c2a3f52 --- /dev/null +++ b/src/doc/book/listings/ch12-an-io-project/listing-12-12/Cargo.toml @@ -0,0 +1,6 @@ +[package] +name = "minigrep" +version = "0.1.0" +edition = "2021" + +[dependencies] diff --git a/src/doc/book/listings/ch12-an-io-project/listing-12-12/output.txt b/src/doc/book/listings/ch12-an-io-project/listing-12-12/output.txt new file mode 100644 index 000000000..c18902518 --- /dev/null +++ b/src/doc/book/listings/ch12-an-io-project/listing-12-12/output.txt @@ -0,0 +1,27 @@ +$ cargo run the poem.txt + Compiling minigrep v0.1.0 (file:///projects/minigrep) +warning: unused `Result` that must be used + --> src/main.rs:19:5 + | +19 | run(config); + | ^^^^^^^^^^^^ + | + = note: `#[warn(unused_must_use)]` on by default + = note: this `Result` may be an `Err` variant, which should be handled + +warning: `minigrep` (bin "minigrep") generated 1 warning + Finished dev [unoptimized + debuginfo] target(s) in 0.71s + Running `target/debug/minigrep the poem.txt` +Searching for the +In file poem.txt +With text: +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! + diff --git a/src/doc/book/listings/ch12-an-io-project/listing-12-12/poem.txt b/src/doc/book/listings/ch12-an-io-project/listing-12-12/poem.txt new file mode 100644 index 000000000..870752731 --- /dev/null +++ b/src/doc/book/listings/ch12-an-io-project/listing-12-12/poem.txt @@ -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! diff --git a/src/doc/book/listings/ch12-an-io-project/listing-12-12/src/main.rs b/src/doc/book/listings/ch12-an-io-project/listing-12-12/src/main.rs new file mode 100644 index 000000000..ab5fdb894 --- /dev/null +++ b/src/doc/book/listings/ch12-an-io-project/listing-12-12/src/main.rs @@ -0,0 +1,51 @@ +use std::env; +use std::fs; +use std::process; +// ANCHOR: here +use std::error::Error; + +// --snip-- + +// ANCHOR_END: here + +fn main() { + let args: Vec<String> = env::args().collect(); + + let config = Config::build(&args).unwrap_or_else(|err| { + println!("Problem parsing arguments: {err}"); + process::exit(1); + }); + + println!("Searching for {}", config.query); + println!("In file {}", config.file_path); + + run(config); +} + +// ANCHOR: here +fn run(config: Config) -> Result<(), Box<dyn Error>> { + let contents = fs::read_to_string(config.file_path)?; + + println!("With text:\n{contents}"); + + Ok(()) +} +// ANCHOR_END: here + +struct Config { + query: String, + file_path: String, +} + +impl Config { + fn build(args: &[String]) -> Result<Config, &'static str> { + if args.len() < 3 { + return Err("not enough arguments"); + } + + let query = args[1].clone(); + let file_path = args[2].clone(); + + Ok(Config { query, file_path }) + } +} |