config/module: fix URL file path handling on Windows

Only adjust the URL Scheme when parsing drive letter file paths on
Windows, don't add a file scheme prefix.
FileDetector is responsible for adding the file scheme prefix.

config/module/detect.go

@@ -2,7 +2,6 @@ package module
 
 import (
 	"fmt"
-	"net/url"
 	"path/filepath"
 )
 
@@ -67,7 +66,7 @@ func Detect(src string, pwd string) (string, error) {
 			}
 		}
 		if subDir != "" {
-			u, err := url.Parse(result)
+			u, err := urlParse(result)
 			if err != nil {
 				return "", fmt.Errorf("Error parsing URL: %s", err)
 			}

config/module/url_helper.go

@@ -1,55 +1,55 @@
-package module
-
-import (
-	"fmt"
-	"net/url"
-	"path/filepath"
-	"runtime"
-)
-
-func urlParse(rawURL string) (*url.URL, error) {
-	if runtime.GOOS == "windows" {
-		if len(rawURL) > 1 && rawURL[1] == ':' {
-			// Assume we're dealing with a file path.
-			rawURL = fmtFileURL(rawURL)
-		} else {
-			// Make sure we're using "/" on Windows. URLs are "/"-based.
-			rawURL = filepath.ToSlash(rawURL)
-		}
-	}
-	u, err := url.Parse(rawURL)
-	if err != nil {
-		return nil, err
-	}
-
-	if runtime.GOOS != "windows" {
-		return u, err
-	}
-
-	if u.Scheme != "file" {
-		return u, err
-	}
-
-	// Remove leading slash for absolute file paths on Windows.
-	// For example, url.Parse yields u.Path = "/C:/Users/user" for
-	// rawurl = "file:///C:/Users/user", which is an incorrect syntax.
-	if len(u.Path) > 2 && u.Path[0] == '/' && u.Path[2] == ':' {
-		u.Path = u.Path[1:]
-	}
-
-	return u, err
-}
-
-func fmtFileURL(path string) string {
-	if runtime.GOOS == "windows" {
-		// Make sure we're using "/" on Windows. URLs are "/"-based.
-		path = filepath.ToSlash(path)
-	}
-
-	// Make sure that we don't start with "/" since we add that below.
-	if path[0] == '/' {
-		path = path[1:]
-	}
-
-	return fmt.Sprintf("file:///%s", path)
-}
+package module
+
+import (
+	"fmt"
+	"net/url"
+	"path/filepath"
+	"runtime"
+)
+
+func urlParse(rawURL string) (*url.URL, error) {
+	if runtime.GOOS == "windows" {
+		// Make sure we're using "/" on Windows. URLs are "/"-based.
+		rawURL = filepath.ToSlash(rawURL)
+	}
+	u, err := url.Parse(rawURL)
+	if err != nil {
+		return nil, err
+	}
+
+	if runtime.GOOS != "windows" {
+		return u, err
+	}
+
+	if len(rawURL) > 1 && rawURL[1] == ':' {
+		// Assume we're dealing with a drive letter file path on Windows.
+		// We need to adjust the URL Path for drive letter file paths
+		// because url.Parse("c:/users/user") yields URL Scheme = "c"
+		// and URL path = "/users/user".
+		u.Path = fmt.Sprintf("%s:%s", u.Scheme, u.Path)
+		u.Scheme = ""
+	}
+
+	// Remove leading slash for absolute file paths on Windows.
+	// For example, url.Parse yields u.Path = "/C:/Users/user" for
+	// rawURL = "file:///C:/Users/user", which is an incorrect syntax.
+	if len(u.Path) > 2 && u.Path[0] == '/' && u.Path[2] == ':' {
+		u.Path = u.Path[1:]
+	}
+
+	return u, err
+}
+
+func fmtFileURL(path string) string {
+	if runtime.GOOS == "windows" {
+		// Make sure we're using "/" on Windows. URLs are "/"-based.
+		path = filepath.ToSlash(path)
+	}
+
+	// Make sure that we don't start with "/" since we add that below.
+	if path[0] == '/' {
+		path = path[1:]
+	}
+
+	return fmt.Sprintf("file:///%s", path)
+}