recently used skill

dir.go

@@ -2,43 +2,59 @@ package here
 
 import (
 	"encoding/json"
+	"fmt"
 	"os"
 	"path/filepath"
 )
 
+var dirCache = &infoMap{}
+
 // Dir attempts to gather info for the requested directory.
 func Dir(p string) (Info, error) {
-	i := newInfo()
+	var err error
+	i, ok := dirCache.LoadOr(p, func(m *infoMap) (Info, bool) {
+		i := newInfo()
 
-	fi, err := os.Stat(p)
-	if err != nil {
-		return i, err
-	}
+		fi, err := os.Stat(p)
+		if err != nil {
+			return i, false
+		}
 
-	if !fi.IsDir() {
-		p = filepath.Dir(p)
-	}
+		if !fi.IsDir() {
+			p = filepath.Dir(p)
+		}
 
-	pwd, err := os.Getwd()
-	if err != nil {
-		return i, err
-	}
+		pwd, err := os.Getwd()
+		if err != nil {
+			return i, false
+		}
+
+		defer os.Chdir(pwd)
+
+		os.Chdir(p)
+
+		b, err := run("go", "list", "-json")
+		if err != nil {
+			return i, false
+		}
 
-	defer os.Chdir(pwd)
+		if err := json.Unmarshal(b, &i); err != nil {
+			return i, false
+		}
 
-	os.Chdir(p)
+		if err := setEnv(&i); err != nil {
+			return i, false
+		}
+		return i, true
+	})
 
-	b, err := run("go", "list", "-json")
 	if err != nil {
 		return i, err
 	}
 
-	if err := json.Unmarshal(b, &i); err != nil {
-		return i, err
+	if !ok {
+		return i, fmt.Errorf("an error occurred %s", p)
 	}
 
-	if err := setEnv(&i); err != nil {
-		return i, err
-	}
 	return i, nil
 }

module.go

@@ -3,11 +3,11 @@ package here
 import "encoding/json"
 
 type Module struct {
-	Path		string	`json:"Path"`
-	Main		bool	`json:"Main"`
-	Dir		string	`json:"Dir"`
-	GoMod		string	`json:"GoMod"`
-	GoVersion	string	`json:"GoVersion"`
+	Path      string `json:"Path"`
+	Main      bool   `json:"Main"`
+	Dir       string `json:"Dir"`
+	GoMod     string `json:"GoMod"`
+	GoVersion string `json:"GoVersion"`
 }
 
 func (i Module) String() string {