5 files changed, 71 insertions, 31 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..8ee6649
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+passphrasegen
\ No newline at end of file
diff --git a/CHANGELOG b/CHANGELOG
new file mode 100644
index 0000000..630c2c1
--- /dev/null
+++ b/CHANGELOG
@@ -0,0 +1,6 @@
+0.2.0
+Add tests, refactor code
+
+0.1.0
+
+Initial release.
\ No newline at end of file
diff --git a/generator/generator.go b/generator/generator.go
new file mode 100644
index 0000000..3ec5154
--- /dev/null
+++ b/generator/generator.go
@@ -0,0 +1,45 @@
+package generator
+
+import (
+	"bufio"
+	"math/rand"
+	"os"
+	"time"
+)
+
+func readLines(path string) ([]string, error) {
+	file, err := os.Open(path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	var lines []string
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		lines = append(lines, scanner.Text())
+	}
+	return lines, scanner.Err()
+}
+
+// RandomWords picks numberOfWords random words from the file located at
+// wordsFile
+func RandomWords(wordsFile string, numberOfWords int) ([]string, error) {
+	rand.Seed(time.Now().UTC().UnixNano())
+
+	words, err := readLines(wordsFile)
+
+	if err != nil {
+		return nil, err
+	}
+
+	phraseWords := make([]string, numberOfWords)
+
+	for index := 0; index < numberOfWords; index++ {
+		randInt := rand.Intn((len(words) - 1))
+
+		phraseWords[index] = words[randInt]
+	}
+
+	return phraseWords, nil
+}
diff --git a/generator/generator_test.go b/generator/generator_test.go
new file mode 100644
index 0000000..4cda593
--- /dev/null
+++ b/generator/generator_test.go
@@ -0,0 +1,15 @@
+package generator
+
+import "testing"
+
+func TestRandomWords(t *testing.T) {
+	words, err := RandomWords("/usr/share/dict/words", 4)
+
+	if err != nil {
+		t.Errorf("%s", err)
+	}
+
+	if len(words) != 4 {
+		t.Errorf("RandomWords does not return the correct number of words")
+	}
+}
diff --git a/passphrasegen.go b/passphrasegen.go
index 32d708e..89b25d2 100644
--- a/passphrasegen.go
+++ b/passphrasegen.go
@@ -1,39 +1,20 @@
 package main
 
 import (
-	"bufio"
 	"flag"
 	"fmt"
-	"math/rand"
-	"os"
 	"strings"
-	"time"
+
+	generator "github.com/michael-ball/passphrasegen/generator"
 )
 
 var numWords = flag.Int("w", 4, "Number of words in passphrase")
 
-func readLines(path string) ([]string, error) {
-	file, err := os.Open(path)
-	if err != nil {
-		return nil, err
-	}
-	defer file.Close()
-
-	var lines []string
-	scanner := bufio.NewScanner(file)
-	for scanner.Scan() {
-		lines = append(lines, scanner.Text())
-	}
-	return lines, scanner.Err()
-}
-
 func init() {
-	rand.Seed(time.Now().UTC().UnixNano())
+	flag.Parse()
 }
 
 func main() {
-	flag.Parse()
-
 	args := flag.Args()
 
 	wordsFile := "/usr/share/dict/words"
@@ -42,20 +23,12 @@ func main() {
 		wordsFile = args[0]
 	}
 
-	words, err := readLines(wordsFile)
+	phraseWords, err := generator.RandomWords(wordsFile, *numWords)
 
 	if err != nil {
 		fmt.Println(err)
 		return
 	}
 
-	phraseWords := make([]string, *numWords)
-
-	for index := 0; index < *numWords; index++ {
-		randInt := rand.Intn((len(words) - 1))
-
-		phraseWords[index] = words[randInt]
-	}
-
 	fmt.Println(strings.Join(phraseWords, " "))
 }