move password generation off to its own file

src/generate.rs

@@ -0,0 +1,43 @@
+use rand::rngs::OsRng;
+use rand::seq::IteratorRandom;
+use rand::seq::SliceRandom;
+use std::iter::FromIterator;
+
+pub fn generate(spec: &str) {
+    let (len, rest) = {
+        let mut separated = spec.splitn(2, ",");
+        let len = separated.next().unwrap();
+        let rest = separated.next().unwrap();
+        (len, rest)
+    };
+    let mut rnd = OsRng::new().unwrap();
+
+    let mut password_vec: Vec<char> = rest
+        .chars()
+        .cycle()
+        .map(|c| match c {
+            'a' => "abcdefghijklmnopqrstuvwxyz"
+                .chars()
+                .choose(&mut rnd)
+                .expect("Could not get random element"),
+            'A' => "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                .chars()
+                .choose(&mut rnd)
+                .expect("Could not get random element"),
+            '1' => "1234567890"
+                .chars()
+                .choose(&mut rnd)
+                .expect("Could not get random element"),
+            '.' => ".,/?-=#%^"
+                .chars()
+                .choose(&mut rnd)
+                .expect("Could not get random element"),
+            _ => panic!("Unknown character spec: {}", c),
+        })
+        .take(len.parse().unwrap())
+        .collect();
+
+    password_vec.shuffle(&mut rnd);
+    let shuffled: String = String::from_iter(password_vec.into_iter());
+    println!("{}", shuffled);
+}

src/main.rs

@@ -1,13 +1,10 @@
 use docopt::Docopt;
 use log::debug;
-use rand::rngs::OsRng;
-use rand::seq::IteratorRandom;
-use rand::seq::SliceRandom;
 use serde::Deserialize;
 use std::error::Error;
-use std::iter::FromIterator;
 
 pub mod db;
+pub mod generate;
 
 static USAGE: &'static str = "
 foil
@@ -35,45 +32,6 @@ struct Args {
     arg_spec: Option<String>,
 }
 
-fn generate(spec: &str) {
-    let (len, rest) = {
-        let mut separated = spec.splitn(2, ",");
-        let len = separated.next().unwrap();
-        let rest = separated.next().unwrap();
-        (len, rest)
-    };
-    let mut rnd = OsRng::new().unwrap();
-
-    let mut password_vec: Vec<char> = rest
-        .chars()
-        .cycle()
-        .map(|c| match c {
-            'a' => "abcdefghijklmnopqrstuvwxyz"
-                .chars()
-                .choose(&mut rnd)
-                .expect("Could not get random element"),
-            'A' => "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-                .chars()
-                .choose(&mut rnd)
-                .expect("Could not get random element"),
-            '1' => "1234567890"
-                .chars()
-                .choose(&mut rnd)
-                .expect("Could not get random element"),
-            '.' => ".,/?-=#%^"
-                .chars()
-                .choose(&mut rnd)
-                .expect("Could not get random element"),
-            _ => panic!("Unknown character spec: {}", c),
-        })
-        .take(len.parse().unwrap())
-        .collect();
-
-    password_vec.shuffle(&mut rnd);
-    let shuffled: String = String::from_iter(password_vec.into_iter());
-    println!("{}", shuffled);
-}
-
 fn main() -> Result<(), Box<dyn Error>> {
     pretty_env_logger::init();
     let args: Args = Docopt::new(USAGE)
@@ -82,7 +40,7 @@ fn main() -> Result<(), Box<dyn Error>> {
     debug!("{:?}", args);
 
     if args.cmd_generate {
-        generate(&args.arg_spec.unwrap());
+        generate::generate(&args.arg_spec.unwrap());
         return Ok(());
     }