Files and Directories

Path Join and Clean

path.Join and path.Clean build predictable slash-separated paths from pieces.

path handling Path helpers avoid hand-building separators and normalize redundant path pieces.

Path Join and Clean

folder
path_join_clean.go
Replay: real traced execution (multi-file project)
package main

import (
	"fmt"
	"path"
)

func main() {
	var folder = "reports"
	joined := path.Join("data", folder, "today.txt")
	messy := "data/" + folder + "/../" + folder + "/today.txt"
	cleaned := path.Clean(messy)

	fmt.Println("folder=", folder)
	fmt.Println("joined=", joined)
	fmt.Println("cleaned=", cleaned)
	fmt.Println("same=", joined == cleaned)
}

package main

import (
	"fmt"
	"path"
)

func main() {
	var folder = "logs"
	joined := path.Join("data", folder, "today.txt")
	messy := "data/" + folder + "/../" + folder + "/today.txt"
	cleaned := path.Clean(messy)

	fmt.Println("folder=", folder)
	fmt.Println("joined=", joined)
	fmt.Println("cleaned=", cleaned)
	fmt.Println("same=", joined == cleaned)
}

package main

import (
	"fmt"
	"path"
)

func main() {
	var folder = "archive"
	joined := path.Join("data", folder, "today.txt")
	messy := "data/" + folder + "/../" + folder + "/today.txt"
	cleaned := path.Clean(messy)

	fmt.Println("folder=", folder)
	fmt.Println("joined=", joined)
	fmt.Println("cleaned=", cleaned)
	fmt.Println("same=", joined == cleaned)
}

  1. folder ← "reports", joined ← "data/reports/today.txt", messy ← "data/reports/../reports/today.txt"

    8func main() {9  var folder→ "reports" = "reports" //@folder="logs", "archive"10  joined→ "data/reports/today.txt" := path.Join("data", folder"reports", "today.txt")11  messy→ "data/reports/../reports/today.txt" := "data/" + folder"reports" + "/../" + folder + "/today.txt"12  cleaned→ "data/reports/today.txt" := path.Clean(messy"data/reports/../reports/today.txt")1314  fmt.Println("folder=", folder"reports")15  fmt.Println("joined=", joined"data/reports/today.txt")16  fmt.Println("cleaned=", cleaned"data/reports/today.txt")17  fmt.Println("same=", joined"data/reports/today.txt" == cleaned"data/reports/today.txt")18}
    outputfolder= reports
joined= data/reports/today.txt
cleaned= data/reports/today.txt
same= true

  1. folder ← "logs", joined ← "data/logs/today.txt", messy ← "data/logs/../logs/today.txt"

    8func main() {9  var folder→ "logs" = "logs"10  joined→ "data/logs/today.txt" := path.Join("data", folder"logs", "today.txt")11  messy→ "data/logs/../logs/today.txt" := "data/" + folder"logs" + "/../" + folder + "/today.txt"12  cleaned→ "data/logs/today.txt" := path.Clean(messy"data/logs/../logs/today.txt")1314  fmt.Println("folder=", folder"logs")15  fmt.Println("joined=", joined"data/logs/today.txt")16  fmt.Println("cleaned=", cleaned"data/logs/today.txt")17  fmt.Println("same=", joined"data/logs/today.txt" == cleaned"data/logs/today.txt")18}
    outputfolder= logs
joined= data/logs/today.txt
cleaned= data/logs/today.txt
same= true

  1. folder ← "archive", joined ← "data/archive/today.txt", messy ← "data/archive/../archive/today.txt"

    8func main() {9  var folder→ "archive" = "archive"10  joined→ "data/archive/today.txt" := path.Join("data", folder"archive", "today.txt")11  messy→ "data/archive/../archive/today.txt" := "data/" + folder"archive" + "/../" + folder + "/today.txt"12  cleaned→ "data/archive/today.txt" := path.Clean(messy"data/archive/../archive/today.txt")1314  fmt.Println("folder=", folder"archive")15  fmt.Println("joined=", joined"data/archive/today.txt")16  fmt.Println("cleaned=", cleaned"data/archive/today.txt")17  fmt.Println("same=", joined"data/archive/today.txt" == cleaned"data/archive/today.txt")18}
    outputfolder= archive
joined= data/archive/today.txt
cleaned= data/archive/today.txt
same= true