Add dir

dir/dir.go

@@ -0,0 +1,66 @@
+package dir
+
+import (
+	"fmt"
+	"io/fs"
+	"os"
+	"path/filepath"
+)
+
+func check(err error) {
+	if err != nil {
+		panic(err)
+	}
+}
+
+func createEmptyFile(p string) {
+	check(os.WriteFile(p, []byte(""), 0700))
+}
+
+func Dir() {
+	dirPath := "/tmp/gobyex-tempdir"
+	err := os.Mkdir(dirPath, 0700)
+	check(err)
+	defer os.RemoveAll(dirPath)
+
+	createEmptyFile(filepath.Join(dirPath, "file1"))
+
+	check(os.MkdirAll(filepath.Join(dirPath, "child", "grandchild"), 0700))
+
+	createEmptyFile(filepath.Join(dirPath, "child", "grandchild", "file1"))
+	createEmptyFile(filepath.Join(dirPath, "child", "grandchild", "file2"))
+	createEmptyFile(filepath.Join(dirPath, "child", "grandchild", "file3"))
+
+	check(os.Mkdir(filepath.Join(dirPath, "child", "grandchild", "dir1"), 0700))
+
+	entries, err := os.ReadDir(filepath.Join(dirPath, "child", "grandchild"))
+	check(err)
+
+	fmt.Println("Lisitng", filepath.Join(dirPath, "child", "grandchild"))
+	for _, entry := range entries {
+		fmt.Printf("%s, is dir? %t\n", entry.Name(), entry.IsDir())
+	}
+
+	check(os.Chdir(dirPath))
+
+	entries, err = os.ReadDir(".")
+	check(err)
+
+	fmt.Println("Listing", dirPath)
+	for _, entry := range entries {
+		fmt.Printf("%s, is dir? %t\n", entry.Name(), entry.IsDir())
+	}
+
+	fmt.Println("Walking the file tree at", dirPath)
+	// WalkDir is more efficient than Walk
+	check(filepath.WalkDir(".", walk))
+}
+
+func walk(p string, d fs.DirEntry, err error) error {
+	if err != nil {
+		return err
+	}
+
+	fmt.Println("  ", p, "is dir?", d.IsDir())
+	return nil
+}

main.go

@@ -37,7 +37,8 @@ package main
 // import "git.sangeeth.dev/gobyexample/files"
 // import "git.sangeeth.dev/gobyexample/linefilter"
 // import "git.sangeeth.dev/gobyexample/exit"
-import "git.sangeeth.dev/gobyexample/filepath"
+// import "git.sangeeth.dev/gobyexample/filepath"
+import "git.sangeeth.dev/gobyexample/dir"
 
 func main() {
 	// runes.Runes()
@@ -77,5 +78,6 @@ func main() {
 	// files.Files()
 	// linefilter.LineFilter()
 	// exit.Exit()
-	filepath.Filepath()
+	// filepath.Filepath()
+	dir.Dir()
 }