Strip the vendor'd section of the package path

If the package that easyjson is being used on is vendor'd
then we need to strip off the vendor'd bit of the pkg path

Fixes: mailru#29
See: golang/go#12739

parser/parser.go

@@ -89,3 +89,12 @@ func (p *Parser) Parse(fname string, isDir bool) error {
 	}
 	return nil
 }
+
+// fixes vendored paths
+func fixPkgPathVendoring(pkgPath string) string {
+	const vendor = "/vendor/"
+	if i := strings.LastIndex(pkgPath, vendor); i != -1 {
+		return pkgPath[i+len(vendor):]
+	}
+	return pkgPath
+}

parser/parser_unix.go

@@ -22,9 +22,9 @@ func getPkgPath(fname string, isDir bool) (string, error) {
 		prefix := path.Join(p, "src") + "/"
 		if rel := strings.TrimPrefix(fname, prefix); rel != fname {
 			if !isDir {
-				return path.Dir(rel), nil
+				return fixPkgPathVendoring(path.Dir(rel)), nil
 			} else {
-				return path.Clean(rel), nil
+				return fixPkgPathVendoring(path.Clean(rel)), nil
 			}
 		}
 	}

parser/parser_windows.go

@@ -1,37 +1,37 @@
-package parser
-
-import (
-	"fmt"
-	"os"
-	"path"
-	"strings"
-)
-
-func normalizePath(path string) string {
-	return strings.Replace(path, "\\", "/", -1)
-}
-
-func getPkgPath(fname string, isDir bool) (string, error) {
-	if !path.IsAbs(fname) {
-		pwd, err := os.Getwd()
-		if err != nil {
-			return "", err
-		}
-		fname = path.Join(pwd, fname)
-	}
-
-	fname = normalizePath(fname)
-
-	for _, p := range strings.Split(os.Getenv("GOPATH"), ";") {
-		prefix := path.Join(normalizePath(p), "src") + "/"
-		if rel := strings.TrimPrefix(fname, prefix); rel != fname {
-			if !isDir {
-				return path.Dir(rel), nil
-			} else {
-				return path.Clean(rel), nil
-			}
-		}
-	}
-
-	return "", fmt.Errorf("file '%v' is not in GOPATH", fname)
-}
+package parser
+
+import (
+	"fmt"
+	"os"
+	"path"
+	"strings"
+)
+
+func normalizePath(path string) string {
+	return strings.Replace(path, "\\", "/", -1)
+}
+
+func getPkgPath(fname string, isDir bool) (string, error) {
+	if !path.IsAbs(fname) {
+		pwd, err := os.Getwd()
+		if err != nil {
+			return "", err
+		}
+		fname = path.Join(pwd, fname)
+	}
+
+	fname = normalizePath(fname)
+
+	for _, p := range strings.Split(os.Getenv("GOPATH"), ";") {
+		prefix := path.Join(normalizePath(p), "src") + "/"
+		if rel := strings.TrimPrefix(fname, prefix); rel != fname {
+			if !isDir {
+				return fixPkgPathVendoring(path.Dir(rel)), nil
+			} else {
+				return fixPkgPathVendoring(path.Clean(rel)), nil
+			}
+		}
+	}
+
+	return "", fmt.Errorf("file '%v' is not in GOPATH", fname)
+}