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vendor/github.com/adrg/xdg/internal/pathutil/pathutil.go

@@ -0,0 +1,78 @@
+package pathutil
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+// Unique eliminates the duplicate paths from the provided slice and returns
+// the result. The items in the output slice are in the order in which they
+// occur in the input slice. If a `home` location is provided, the paths are
+// expanded using the `ExpandHome` function.
+func Unique(paths []string, home string) []string {
+	var (
+		uniq     []string
+		registry = map[string]struct{}{}
+	)
+
+	for _, p := range paths {
+		p = ExpandHome(p, home)
+		if p != "" && filepath.IsAbs(p) {
+			if _, ok := registry[p]; ok {
+				continue
+			}
+
+			registry[p] = struct{}{}
+			uniq = append(uniq, p)
+		}
+	}
+
+	return uniq
+}
+
+// Create returns a suitable location relative to which the file with the
+// specified `name` can be written. The first path from the provided `paths`
+// slice which is successfully created (or already exists) is used as a base
+// path for the file. The `name` parameter should contain the name of the file
+// which is going to be written in the location returned by this function, but
+// it can also contain a set of parent directories, which will be created
+// relative to the selected parent path.
+func Create(name string, paths []string) (string, error) {
+	var searchedPaths []string
+	for _, p := range paths {
+		p = filepath.Join(p, name)
+
+		dir := filepath.Dir(p)
+		if Exists(dir) {
+			return p, nil
+		}
+		if err := os.MkdirAll(dir, os.ModeDir|0700); err == nil {
+			return p, nil
+		}
+
+		searchedPaths = append(searchedPaths, dir)
+	}
+
+	return "", fmt.Errorf("could not create any of the following paths: %s",
+		strings.Join(searchedPaths, ", "))
+}
+
+// Search searches for the file with the specified `name` in the provided
+// slice of `paths`. The `name` parameter must contain the name of the file,
+// but it can also contain a set of parent directories.
+func Search(name string, paths []string) (string, error) {
+	var searchedPaths []string
+	for _, p := range paths {
+		p = filepath.Join(p, name)
+		if Exists(p) {
+			return p, nil
+		}
+
+		searchedPaths = append(searchedPaths, filepath.Dir(p))
+	}
+
+	return "", fmt.Errorf("could not locate `%s` in any of the following paths: %s",
+		filepath.Base(name), strings.Join(searchedPaths, ", "))
+}