Init.

1 files changed, 121 insertions, 0 deletions

diff --git a/meap/ch2/src/main.rs b/meap/ch2/src/main.rs
new file mode 100755
index 0000000..4d16a7a
--- /dev/null
+++ b/meap/ch2/src/main.rs
@@ -0,0 +1,121 @@
+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
+//}