import (
"path"
"path/filepath"
+ "sync"
)
-var TgtCache = make(map[string]*Tgt)
+var (
+ TgtCache = make(map[string]*Tgt)
+ TgtCacheM sync.RWMutex
+)
func mustAbs(pth string) string {
pth, err := filepath.Abs(pth)
return mustRel(Cwd, path.Join(paths...))
}
-func cwdAndTgt(tgt string) (string, string) {
- cwd, tgt := path.Split(tgt)
- return mustAbs(cwd), tgt
+func pathSplit(a string) (h, t string) {
+ h, t = path.Split(a)
+ if len(h) > 1 {
+ h = h[:len(h)-1]
+ }
+ return
}
type Tgt struct {
- // a/h/t resemble zsh'es :a, :h, :t modifiers
a string // absolute path
- h string // head of the path, directory
- t string // tail of the path, only name
rel string // relative to Cwd
dep string // path to dependency file
}
func NewTgt(tgt string) *Tgt {
a := mustAbs(tgt)
- if TgtCache != nil {
- if t := TgtCache[a]; t != nil {
- return t
- }
- }
- t := Tgt{a: a}
- t.h, t.t = path.Split(t.a)
- if len(t.h) > 1 {
- t.h = t.h[:len(t.h)-1]
+ TgtCacheM.RLock()
+ cached := TgtCache[a]
+ TgtCacheM.RUnlock()
+ if cached != nil {
+ return cached
}
- t.rel = mustRel(Cwd, t.a)
- if TgtCache != nil {
- TgtCache[a] = &t
+ h, t := pathSplit(a)
+ res := Tgt{
+ a: a,
+ rel: mustRel(Cwd, a),
+ dep: path.Join(h, RedoDir, t+DepSuffix),
}
- return &t
+ TgtCacheM.Lock()
+ TgtCache[a] = &res
+ TgtCacheM.Unlock()
+ return &res
}
func (tgt *Tgt) String() string {
return tgt.rel
}
-func (tgt *Tgt) Dep() string {
- if tgt.dep == "" {
- tgt.dep = path.Join(tgt.h, RedoDir, tgt.t+DepSuffix)
- }
- return tgt.dep
-}
-
func (tgt *Tgt) RelTo(cwd string) string {
return mustRel(cwd, tgt.a)
}