106 lines
3.1 KiB
Go
106 lines
3.1 KiB
Go
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package xdgbase
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import (
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"os"
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"path/filepath"
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)
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// DataHome returns the value of XDG_DATA_HOME, or the specification-defined
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// fallback value of $HOME/.local/share.
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func DataHome() string {
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return envSingle("XDG_DATA_HOME", func() string {
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return filepath.Join(home(), ".local", "share")
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})
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}
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// OtherDataDirs returns the values from XDG_DATA_DIRS, or the specification-defined
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// fallback values "/usr/local/share/" and "/usr/share/".
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func OtherDataDirs() []string {
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return envMulti("XDG_DATA_DIRS", func() []string {
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return []string{"/usr/local/share/", "/usr/share/"}
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})
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}
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// DataDirs returns the combination of DataHome and OtherDataDirs, giving the
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// full set of data directories to search, in preference order.
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func DataDirs() []string {
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ret := make([]string, 0, 3) // default OtherDataDirs has two elements
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ret = append(ret, DataHome())
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ret = append(ret, OtherDataDirs()...)
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return ret[:len(ret):len(ret)]
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}
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// ConfigHome returns the value of XDG_CONFIG_HOME, or the specification-defined
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// fallback value of $HOME/.config.
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func ConfigHome() string {
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return envSingle("XDG_CONFIG_HOME", func() string {
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return filepath.Join(home(), ".config")
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})
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}
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// OtherConfigDirs returns the values from XDG_CONFIG_DIRS, or the
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// specification-defined fallback value "/etc/xdg".
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func OtherConfigDirs() []string {
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return envMulti("XDG_CONFIG_DIRS", func() []string {
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return []string{"/etc/xdg"}
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})
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}
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// ConfigDirs returns the combination of ConfigHome and OtherConfigDirs, giving the
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// full set of config directories to search, in preference order.
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func ConfigDirs() []string {
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ret := make([]string, 0, 2) // default OtherConfigDirs has one element
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ret = append(ret, ConfigHome())
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ret = append(ret, OtherConfigDirs()...)
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return ret[:len(ret):len(ret)]
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}
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// CacheHome returns the value of XDG_CACHE_HOME, or the specification-defined
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// fallback value of $HOME/.cache.
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func CacheHome() string {
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return envSingle("XDG_CACHE_HOME", func() string {
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return filepath.Join(home(), ".cache")
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})
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}
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// MaybeRuntimeDir returns the value of XDG_RUNTIME_DIR, or an empty string if
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// it is not set.
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//
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// Calling applications MUST check that the return value is non-empty before
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// using it, because there is no reasonable default behavior when no runtime
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// directory is defined.
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func MaybeRuntimeDir() string {
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return envSingle("XDG_RUNTIME_DIR", func() string {
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return ""
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})
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}
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func envSingle(name string, fallback func() string) string {
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if p := os.Getenv(name); p != "" {
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if filepath.IsAbs(p) {
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return p
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}
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}
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return fallback()
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}
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func envMulti(name string, fallback func() []string) []string {
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if p := os.Getenv(name); p != "" {
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parts := filepath.SplitList(p)
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// Make sure all of the paths are absolute
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for i := len(parts) - 1; i >= 0; i-- {
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if !filepath.IsAbs(parts[i]) {
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// We'll shift everything after this point in the list
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// down so that this element is no longer present.
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copy(parts[i:], parts[i+1:])
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parts = parts[:len(parts)-1]
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}
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}
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parts = parts[:len(parts):len(parts)] // hide any extra capacity from the caller
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return parts
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}
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return fallback()
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}
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