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// SPDX-License-Identifier: GPL-3.0-or-later
// Package xdg resolves the XDG base directories and expands ~ in paths.
package xdg
import (
"os"
"path/filepath"
"strings"
)
// ConfigHome is $XDG_CONFIG_HOME, or ~/.config.
func ConfigHome() string { return base("XDG_CONFIG_HOME", ".config") }
// StateHome is $XDG_STATE_HOME, or ~/.local/state.
func StateHome() string { return base("XDG_STATE_HOME", filepath.Join(".local", "state")) }
// DataHome is $XDG_DATA_HOME, or ~/.local/share.
func DataHome() string { return base("XDG_DATA_HOME", filepath.Join(".local", "share")) }
// CacheHome is $XDG_CACHE_HOME, or ~/.cache.
func CacheHome() string { return base("XDG_CACHE_HOME", ".cache") }
// base follows the XDG rule that a relative value is invalid and ignored.
func base(env, fallback string) string {
if v := os.Getenv(env); filepath.IsAbs(v) {
return filepath.Clean(v)
}
return filepath.Join(Home(), fallback)
}
// Home is the user's home directory, or "/" when it is unknown.
func Home() string {
if h, err := os.UserHomeDir(); err == nil && h != "" {
return filepath.Clean(h)
}
return "/"
}
// Expand replaces a leading "~" or "~/" with the home directory.
// "~user" is left alone.
func Expand(p string) string {
if p == "~" {
return Home()
}
if strings.HasPrefix(p, "~/") {
return filepath.Join(Home(), p[2:])
}
return p
}
// Abbrev replaces a leading home directory with "~", for display and for
// paths written into config files.
func Abbrev(p string) string {
h := Home()
if p == h {
return "~"
}
if h != "/" && strings.HasPrefix(p, h+"/") {
return "~/" + p[len(h)+1:]
}
return p
}
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