From ff3f4757af281a923999bcb79f67c77e17b4bef7 Mon Sep 17 00:00:00 2001 From: Greg Burri Date: Thu, 1 Jul 2021 13:26:55 +0200 Subject: [PATCH 1/1] Initial commit: add the grep like from chapter 2 --- .gitignore | 3 + ch2-str-simple-pattern/Cargo.lock | 146 +++++++++++++++++++++++++++++ ch2-str-simple-pattern/Cargo.toml | 11 +++ ch2-str-simple-pattern/src/main.rs | 60 ++++++++++++ ch2-str-simple-pattern/text.txt | 4 + 5 files changed, 224 insertions(+) create mode 100644 .gitignore create mode 100644 ch2-str-simple-pattern/Cargo.lock create mode 100644 ch2-str-simple-pattern/Cargo.toml create mode 100644 ch2-str-simple-pattern/src/main.rs create mode 100644 ch2-str-simple-pattern/text.txt diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..a76ebad --- /dev/null +++ b/.gitignore @@ -0,0 +1,3 @@ +target/ +.vscode/ +**/*.rs.bk \ No newline at end of file diff --git a/ch2-str-simple-pattern/Cargo.lock b/ch2-str-simple-pattern/Cargo.lock new file mode 100644 index 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line arguments. + * - Read a file line by line. + * - Read stdin + * - Use regexp to match a line. + */ + +use std::{ fs::File, io::{ self, BufReader, prelude::* } }; +use regex::Regex; +use clap::{ App, Arg }; + +fn main() { + let args = App::new("grep-lite") + .version("0.1") + .about("searches for patterns") + .arg(Arg::with_name("pattern") + .help("The pattern to search for") + .takes_value(true) + .required(true) + ) + .arg(Arg::with_name("file") + .help("File to search into. Read from stding if not given") + .takes_value(true) + .required(false) + ) + .get_matches(); + + let pattern = args.value_of("pattern").unwrap(); + let pattern_re = Regex::new(pattern).unwrap(); + + match args.value_of("file") { + Some(filename) => { + let file = File::open(filename).unwrap(); + let reader = BufReader::new(file); + process_lines(reader, pattern_re); + }, + None => { + let stdin = io::stdin(); + let reader = stdin.lock(); + process_lines(reader, pattern_re); + } + } +} + +fn process_lines(reader: T, pattern_re: Regex) { + for (i, line_result) in reader.lines().enumerate() { + match line_result { + Ok(line) => { + let contains_substring = pattern_re.find(&line); + match contains_substring { + Some(_) => println!("Found \"{}\" at line number {}", pattern_re, i + 1), + None => (), + } + }, + Err(err) => + eprintln!("Can't read line: {}", err) + } + } +} diff --git a/ch2-str-simple-pattern/text.txt b/ch2-str-simple-pattern/text.txt new file mode 100644 index 0000000..48bd08c --- /dev/null +++ b/ch2-str-simple-pattern/text.txt @@ -0,0 +1,4 @@ +Every face, every shop, bedroom window, public-house, and +dark square is a picture feverishly turned--in search of what? +It is the same with books. +What do we seek through millions of pages? \ No newline at end of file -- 2.45.2