added password generator, added ability to use text file as wordlist

src/bin/duralumin.rs

@@ -1,3 +1,5 @@
+use std::path::PathBuf;
+
 use clap::Parser;
 use libduralumin::passphrase_gen::{PassPhraseGenerator, Words};
 
@@ -17,7 +19,11 @@ struct Opts {
     min_word_length: Option<i16>,
     #[clap(short, long)]
     count: Option<i16>,
-    #[clap(long, default_value = "useapassphrase")]
+    #[clap(
+        long,
+        default_value = "useapassphrase",
+        long_help = "word list to use for passphrase generation, a filepath or any of `useapassphrase`, `english`"
+    )]
     backend: String,
 }
 
@@ -46,6 +52,7 @@ impl Opts {
 enum Backend {
     UseAPassPhrase,
     EnglishWords,
+    File(PathBuf),
 }
 
 impl Backend {
@@ -56,7 +63,14 @@ impl Backend {
         match s.as_ref() {
             "useapassphrase" => Some(Backend::UseAPassPhrase),
             "english" => Some(Backend::EnglishWords),
-            _ => None,
+            _ => {
+                let path = PathBuf::from(s.as_ref());
+                if path.exists() {
+                    Some(Backend::File(path))
+                } else {
+                    None
+                }
+            }
         }
     }
 }
@@ -69,11 +83,11 @@ fn main() {
         .with_length(opts.words_per_passphrase());
 
     let words = match opts.backend() {
-        Some(Backend::UseAPassPhrase) => {
-            Words::from_str(include_str!("../../useapassphrase.txt"))
-        }
-        Some(Backend::EnglishWords) => {
-            Words::from_str(include_str!("../../words_alpha.txt"))
+        Some(Backend::UseAPassPhrase) => Words::from_str(include_str!("../../useapassphrase.txt")),
+        Some(Backend::EnglishWords) => Words::from_str(include_str!("../../words_alpha.txt")),
+        Some(path) => {
+            Words::from_text_file(std::fs::File::open(path).expect("failed to read word list."))
+                .expect("word list from path.")
         }
         None => {
             panic!("invalid backend.")