6 files changed, 152 insertions, 0 deletions
diff --git a/src/go/plugin/go.d/pkg/multipath/multipath.go b/src/go/plugin/go.d/pkg/multipath/multipath.go
new file mode 100644
index 00000000..6172def0
--- /dev/null
+++ b/src/go/plugin/go.d/pkg/multipath/multipath.go
@@ -0,0 +1,90 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package multipath
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"path/filepath"
+	"slices"
+	"strings"
+
+	"github.com/mitchellh/go-homedir"
+)
+
+type ErrNotFound struct{ msg string }
+
+func (e ErrNotFound) Error() string { return e.msg }
+
+// IsNotFound returns a boolean indicating whether the error is ErrNotFound or not.
+func IsNotFound(err error) bool {
+	var errNotFound ErrNotFound
+	return errors.As(err, &errNotFound)
+}
+
+// MultiPath multi-paths
+type MultiPath []string
+
+// New multi-paths
+func New(paths ...string) MultiPath {
+	set := map[string]bool{}
+	mPath := make(MultiPath, 0)
+
+	for _, dir := range paths {
+		if dir == "" {
+			continue
+		}
+		if d, err := homedir.Expand(dir); err != nil {
+			dir = d
+		}
+		if !set[dir] {
+			mPath = append(mPath, dir)
+			set[dir] = true
+		}
+	}
+
+	return mPath
+}
+
+// Find finds a file in given paths
+func (p MultiPath) Find(filename string) (string, error) {
+	for _, dir := range p {
+		file := filepath.Join(dir, filename)
+		if _, err := os.Stat(file); !os.IsNotExist(err) {
+			return file, nil
+		}
+	}
+	return "", ErrNotFound{msg: fmt.Sprintf("can't find '%s' in %v", filename, p)}
+}
+
+func (p MultiPath) FindFiles(suffixes ...string) ([]string, error) {
+	set := make(map[string]bool)
+	var files []string
+
+	for _, dir := range p {
+		entries, err := os.ReadDir(dir)
+		if err != nil {
+			continue
+		}
+
+		for _, e := range entries {
+			if !e.Type().IsRegular() {
+				continue
+			}
+
+			ext := filepath.Ext(e.Name())
+			name := strings.TrimSuffix(e.Name(), ext)
+
+			if (len(suffixes) != 0 && !slices.Contains(suffixes, ext)) || set[name] {
+				continue
+			}
+
+			set[name] = true
+			file := filepath.Join(dir, e.Name())
+			files = append(files, file)
+		}
+	}
+
+	return files, nil
+}
diff --git a/src/go/plugin/go.d/pkg/multipath/multipath_test.go b/src/go/plugin/go.d/pkg/multipath/multipath_test.go
new file mode 100644
index 00000000..cd6c90d9
--- /dev/null
+++ b/src/go/plugin/go.d/pkg/multipath/multipath_test.go
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package multipath
+
+import (
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestNew(t *testing.T) {
+	assert.Len(
+		t,
+		New("path1", "path2", "path2", "", "path3"),
+		3,
+	)
+}
+
+func TestMultiPath_Find(t *testing.T) {
+	m := New("path1", "testdata/data1")
+
+	v, err := m.Find("not exist")
+	assert.Zero(t, v)
+	assert.Error(t, err)
+
+	v, err = m.Find("test-empty.conf")
+	assert.Equal(t, "testdata/data1/test-empty.conf", v)
+	assert.Nil(t, err)
+
+	v, err = m.Find("test.conf")
+	assert.Equal(t, "testdata/data1/test.conf", v)
+	assert.Nil(t, err)
+}
+
+func TestIsNotFound(t *testing.T) {
+	assert.True(t, IsNotFound(ErrNotFound{}))
+	assert.False(t, IsNotFound(errors.New("")))
+}
+
+func TestMultiPath_FindFiles(t *testing.T) {
+	m := New("path1", "testdata/data2", "testdata/data1")
+
+	files, err := m.FindFiles(".conf")
+	assert.NoError(t, err)
+	assert.Equal(t, []string{"testdata/data2/test-empty.conf", "testdata/data2/test.conf"}, files)
+
+	files, err = m.FindFiles()
+	assert.NoError(t, err)
+	assert.Equal(t, []string{"testdata/data2/test-empty.conf", "testdata/data2/test.conf"}, files)
+
+	files, err = m.FindFiles(".not_exist")
+	assert.NoError(t, err)
+	assert.Equal(t, []string(nil), files)
+
+	m = New("path1", "testdata/data1", "testdata/data2")
+	files, err = m.FindFiles(".conf")
+	assert.NoError(t, err)
+	assert.Equal(t, []string{"testdata/data1/test-empty.conf", "testdata/data1/test.conf"}, files)
+}
diff --git a/src/go/plugin/go.d/pkg/multipath/testdata/data1/test-empty.conf b/src/go/plugin/go.d/pkg/multipath/testdata/data1/test-empty.conf
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/go/plugin/go.d/pkg/multipath/testdata/data1/test-empty.conf
diff --git a/src/go/plugin/go.d/pkg/multipath/testdata/data1/test.conf b/src/go/plugin/go.d/pkg/multipath/testdata/data1/test.conf
new file mode 100644
index 00000000..aebe6473
--- /dev/null
+++ b/src/go/plugin/go.d/pkg/multipath/testdata/data1/test.conf
@@ -0,0 +1 @@
+not empty!
+\ No newline at end of file
diff --git a/src/go/plugin/go.d/pkg/multipath/testdata/data2/test-empty.conf b/src/go/plugin/go.d/pkg/multipath/testdata/data2/test-empty.conf
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/src/go/plugin/go.d/pkg/multipath/testdata/data2/test-empty.conf
diff --git a/src/go/plugin/go.d/pkg/multipath/testdata/data2/test.conf b/src/go/plugin/go.d/pkg/multipath/testdata/data2/test.conf
new file mode 100644
index 00000000..aebe6473
--- /dev/null
+++ b/src/go/plugin/go.d/pkg/multipath/testdata/data2/test.conf
@@ -0,0 +1 @@
+not empty!
+\ No newline at end of file