You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
65 lines
1.8 KiB
Go
65 lines
1.8 KiB
Go
// The `filepath` package provides functions to parse
|
|
// and construct *file paths* in a way that is portable
|
|
// between operating systems; `dir/file` on Linux vs.
|
|
// `dir\file` on Windows, for example.
|
|
package main
|
|
|
|
import (
|
|
"fmt"
|
|
"path/filepath"
|
|
"strings"
|
|
)
|
|
|
|
func main() {
|
|
|
|
// `Join` should be used to construct paths in a
|
|
// portable way. It takes any number of arguments
|
|
// and constructs a hierarchical path from them.
|
|
p := filepath.Join("dir1", "dir2", "filename")
|
|
fmt.Println("p:", p)
|
|
|
|
// You should always use `Join` instead of
|
|
// concatenating `/`s or `\`s manually. In addition
|
|
// to providing portability, `Join` will also
|
|
// normalize paths by removing superfluous separators
|
|
// and directory changes.
|
|
fmt.Println(filepath.Join("dir1//", "filename"))
|
|
fmt.Println(filepath.Join("dir1/../dir1", "filename"))
|
|
|
|
// `Dir` and `Base` can be used to split a path to the
|
|
// directory and the file. Alternatively, `Split` will
|
|
// return both in the same call.
|
|
fmt.Println("Dir(p):", filepath.Dir(p))
|
|
fmt.Println("Base(p):", filepath.Base(p))
|
|
|
|
// We can check whether a path is absolute.
|
|
fmt.Println(filepath.IsAbs("dir/file"))
|
|
fmt.Println(filepath.IsAbs("/dir/file"))
|
|
|
|
filename := "config.json"
|
|
|
|
// Some file names have extensions following a dot. We
|
|
// can split the extension out of such names with `Ext`.
|
|
ext := filepath.Ext(filename)
|
|
fmt.Println(ext)
|
|
|
|
// To find the file's name with the extension removed,
|
|
// use `strings.TrimSuffix`.
|
|
fmt.Println(strings.TrimSuffix(filename, ext))
|
|
|
|
// `Rel` finds a relative path between a *base* and a
|
|
// *target*. It returns an error if the target cannot
|
|
// be made relative to base.
|
|
rel, err := filepath.Rel("a/b", "a/b/t/file")
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
fmt.Println(rel)
|
|
|
|
rel, err = filepath.Rel("a/b", "a/c/t/file")
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
fmt.Println(rel)
|
|
}
|