Improved error handling

src/build/fs/File.go

@@ -0,0 +1,9 @@
+package fs
+
+import "git.akyoto.dev/cli/q/src/build/token"
+
+// File represents a single source file.
+type File struct {
+	Tokens token.List
+	Path   string
+}

src/build/fs/Walk.go

@@ -0,0 +1,63 @@
+package fs
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const blockSize = 4096
+
+// Walk calls your callback function for every file name inside the directory.
+// It doesn't distinguish between files and directories.
+func Walk(directory string, callBack func(string)) error {
+	fd, err := syscall.Open(directory, 0, 0)
+
+	if err != nil {
+		return err
+	}
+
+	defer syscall.Close(fd)
+	buffer := make([]byte, blockSize)
+
+	for {
+		n, err := syscall.ReadDirent(fd, buffer)
+
+		if err != nil {
+			return err
+		}
+
+		if n <= 0 {
+			break
+		}
+
+		readBuffer := buffer[:n]
+
+		for len(readBuffer) > 0 {
+			dirent := (*syscall.Dirent)(unsafe.Pointer(&readBuffer[0]))
+			readBuffer = readBuffer[dirent.Reclen:]
+
+			// Skip deleted files
+			if dirent.Ino == 0 {
+				continue
+			}
+
+			// Skip hidden files
+			if dirent.Name[0] == '.' {
+				continue
+			}
+
+			for i, c := range dirent.Name {
+				if c != 0 {
+					continue
+				}
+
+				bytePointer := (*byte)(unsafe.Pointer(&dirent.Name[0]))
+				name := unsafe.String(bytePointer, i)
+				callBack(name)
+				break
+			}
+		}
+	}
+
+	return nil
+}

src/build/fs/Walk_test.go

@@ -0,0 +1,24 @@
+package fs_test
+
+import (
+	"testing"
+
+	"git.akyoto.dev/cli/q/src/build/fs"
+	"git.akyoto.dev/go/assert"
+)
+
+func TestWalk(t *testing.T) {
+	var files []string
+
+	fs.Walk(".", func(file string) {
+		files = append(files, file)
+	})
+
+	assert.Contains(t, files, "Walk.go")
+	assert.Contains(t, files, "Walk_test.go")
+}
+
+func TestNonExisting(t *testing.T) {
+	err := fs.Walk("does-not-exist", func(file string) {})
+	assert.NotNil(t, err)
+}