Move generation to library

2 files changed, 60 insertions, 0 deletions

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")
+	}
+}