Added function to list files by extension (#4)

Author: denis256

xcollection/xcollection_test.go

@@ -10,7 +10,7 @@ import (
 )
 
 func TestStringBoolMapKeys(t *testing.T) {
-
+	t.Parallel()
 	keys := MapKeys(map[string]bool{
 		"qwe": true,
 		"123": true,
@@ -20,6 +20,7 @@ func TestStringBoolMapKeys(t *testing.T) {
 }
 
 func TestRandomSelection(t *testing.T) {
+	t.Parallel()
 	rand.Seed(time.Now().Unix())
 	element := Random([]string{"1", "2", "3", "4", "5", "6"})
 	log.Printf("Random element: %s", element)

xenv/xenv_test.go

@@ -7,7 +7,7 @@ import (
 )
 
 func TestFetchingCurrentUser(t *testing.T) {
-
+	t.Parallel()
 	user := Env("USER", "")
 
 	assert.NotEmpty(t, user)

xfiles/xfiles.go

@@ -2,7 +2,9 @@ package xfiles
 
 import (
 	"bufio"
+	"io/fs"
 	"os"
+	"path/filepath"
 	"strings"
 
 	"github.com/unidev-platform/golang-core/xcollection"
@@ -29,3 +31,21 @@ func Distinct(path string) ([]string, error) {
 	return xcollection.MapKeys(linesMap), scanner.Err()
 
 }
+
+// Find - extract files matching extension
+func Find(dir string, extension string) ([]string, error) {
+	var files []string
+	err := filepath.WalkDir(dir, func(s string, d fs.DirEntry, e error) error {
+		if e != nil {
+			return e
+		}
+		if filepath.Ext(d.Name()) == extension {
+			files = append(files, s)
+		}
+		return nil
+	})
+	if err != nil {
+		return nil, err
+	}
+	return files, nil
+}

xfiles/xfiles_test.go

@@ -7,9 +7,19 @@ import (
 )
 
 func TestFileLinesExtraction(t *testing.T) {
+	t.Parallel()
 	lines, err := Distinct("distinct_file_lines_test.txt")
 	if err != nil {
 		panic(err)
 	}
 	assert.Equal(t, 6, len(lines))
 }
+
+func TestListFiles(t *testing.T) {
+	t.Parallel()
+	files, err := Find(".", ".txt")
+	if err != nil {
+		panic(err)
+	}
+	assert.Equal(t, 1, len(files))
+}

xstring/xstrings_test.go

@@ -7,6 +7,7 @@ import (
 )
 
 func TestStringExtractions(t *testing.T) {
+	t.Parallel()
 	items := Between(" 1qwe2 666 1xxx2 000", "1", "2")
 
 	assert.Equal(t, 2, len(items))