From 75b28f31e5603c39215b7c91b35610269c7fd0ed Mon Sep 17 00:00:00 2001
From: Michaël Ball <michael.ball@gmail.com>
Date: Thu, 7 Dec 2017 21:01:30 +0000
Subject: Initial commit

---
 src/main.rs | 107 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 src/main.rs

(limited to 'src')

diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..c78441e
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,107 @@
+extern crate getopts;
+extern crate rand;
+
+use getopts::Options;
+use rand::{thread_rng, Rng};
+use std::env;
+use std::vec::Vec;
+use std::fs::File;
+use std::io::{self, BufRead, BufReader};
+use std::path::Path;
+
+fn lines_from_file<P>(filename: &P) -> Result<Vec<String>, io::Error>
+    where P: AsRef<Path>
+{
+    let file = try!(File::open(filename));
+    let buf = BufReader::new(file);
+    Ok(buf.lines()
+        .map(|l| l.expect("Could not parse line"))
+        .collect())
+}
+
+fn print_usage(program: &str, opts: Options) {
+    let brief = format!("Usage: {} DICTIONARY_FILE [options]", program);
+    print!("{}", opts.usage(&brief));
+}
+
+fn random_words_from_dictionary(dictionary: &Vec<String>, words: &usize) -> Vec<String> {
+    let mut rng = thread_rng();
+    let max_idx = dictionary.len() - 1;
+
+    let mut vec = Vec::with_capacity(*words);
+    for _ in 0..*words {
+        let n: usize = rng.gen_range(0, max_idx);
+        let ref token = dictionary[n];
+        vec.push(token.to_string());
+    }
+
+    vec
+}
+
+#[test]
+fn test_random_words_from_dictionary() {
+    let test_dict = vec!["This".to_string(),
+                         "is".to_string(),
+                         "a".to_string(),
+                         "test".to_string(),
+                         "vector".to_string()];
+    let num_words = 3;
+
+    let new_vec = random_words_from_dictionary(&test_dict, &num_words);
+    assert_eq!(new_vec.len(), 3);
+}
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+    let program = args[0].clone();
+
+    let mut opts = Options::new();
+    opts.optopt("w",
+                "",
+                "number of words to use in passphrase, default is 4",
+                "WORDS");
+
+    let matches = match opts.parse(&args[1..]) {
+        Ok(m) => m,
+        Err(f) => panic!("{}", f),
+    };
+
+    let words_opt = matches.opt_str("w");
+
+    let input = if !matches.free.is_empty() {
+        matches.free[0].clone()
+    } else {
+        print_usage(&program, opts);
+        return;
+    };
+
+    let num_words;
+    match words_opt {
+        Some(x) => {
+            match x.parse::<usize>() {
+                Ok(n) => num_words = n,
+                Err(_e) => {
+                    println!("Please enter an integer for the -w flag");
+                    return;
+                }
+            }
+        }
+        None => num_words = 4,
+    }
+
+    let lines;
+
+    match lines_from_file(&input) {
+        Ok(n) => lines = n,
+        Err(_e) => {
+            println!("Cannot read file {}. Please ensure it exists and you have permission to \
+                      read it.",
+                     input);
+            return;
+        }
+    }
+
+    let passphrase = random_words_from_dictionary(&lines, &num_words).join(" ");
+
+    println!("{}", passphrase);
+}
-- 
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