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