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authorAdam Carpenter <gitlab@53hor.net>2019-07-09 15:14:04 -0400
committerAdam Carpenter <gitlab@53hor.net>2019-07-09 15:14:04 -0400
commit7e8ee5ed9cad6484e9f13f81731b102ced58402e (patch)
tree5395402ab07bbb5a659dbd68c701e22a1227202f /meap/ch2/src
downloadlearning-rust-7e8ee5ed9cad6484e9f13f81731b102ced58402e.tar.xz
learning-rust-7e8ee5ed9cad6484e9f13f81731b102ced58402e.zip
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Diffstat (limited to 'meap/ch2/src')
-rwxr-xr-xmeap/ch2/src/main.rs121
1 files changed, 121 insertions, 0 deletions
diff --git a/meap/ch2/src/main.rs b/meap/ch2/src/main.rs
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+extern crate regex;
+extern crate clap;
+
+use regex::Regex;
+use clap::{App, Arg};
+use std::fs::File;
+use std::io;
+use std::io::BufReader;
+use std::io::prelude::*;
+
+
+//use std::ops::{Add};
+
+fn main() {
+// let a = 10;
+// let b: i32 = 20;
+//
+// let c = add(a, b);
+// println!("a + b = {}", c);
+
+
+// let twenty = 20;
+// let twenty_one: i32 = twenty + 1;
+// let floats_okay = 21.0;
+// let million = 1_000_000;
+//
+// println!("{} {} {} {}", twenty, twenty_one, floats_okay, million);
+//
+// let three = 0b11;
+// let thirty = 0o36;
+// let three_hundred = 0x12c;
+//
+// println!("{} {} {}", three, thirty, three_hundred);
+// println!("{:b} {:b} {:b}", three, thirty, three_hundred);
+// println!("{:o} {:o} {:o}", three, thirty, three_hundred);
+// println!("{:x} {:x} {:x}", three, thirty, three_hundred);
+
+
+// //let needle = 42;
+// let haystack = [1, 1, 2, 5, 14, 42, 132, 429, 1430, 4862];
+//
+// for reference in haystack.iter() {
+// let item = *reference;
+//
+// //if item == needle {
+// // println!("{}", item);
+// //}
+//
+// //if reference == &needle {
+// // println!("{}", reference);
+// //}
+//
+// let result = match item {
+// 42 | 132 => "hit",
+// _ => "miss",
+// };
+//
+// println!("{}", result);
+// }
+
+
+ // let (a, b) = (1.2, 3.4);
+ // let (x, y) = (10, 20);
+
+ // let c = add(a, b);
+ // let z = add(x, y);
+
+ // println!("{} {}", c, z);
+
+
+ let args = App::new("ch2")
+ .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("input")
+ .help("file to search")
+ .takes_value(true))
+ .get_matches();
+
+ let pattern = args.value_of("pattern").unwrap();
+ let re = Regex::new(pattern).unwrap();
+
+ let input = args.value_of("input").unwrap_or("-");
+
+ if input == "-" {
+ let stdin = io::stdin();
+ let reader = stdin.lock();
+ process_lines(reader, re);
+ }
+ else {
+ let file = File::open(input).unwrap();
+ let reader = BufReader::new(file);
+ process_lines(reader, re);
+ }
+
+}
+
+fn process_lines<T: BufRead + Sized>(reader: T, re: Regex) {
+ for line_ in reader.lines() {
+ let line = line_.unwrap();
+
+ match re.find(&line) {
+ Some(_) => print!("-> "),
+ None => print!(" "),
+ };
+
+ println!("{}", line);
+ }
+}
+
+//fn add<T: Add<Output = T>>(i: T, j: T) -> T {
+// i + j
+//}
+
+
+//fn add(i: i32, j: i32) -> i32 {
+// i + j
+//}