normalize paths from windows to posix

Author: bcardiff

spec/unit/dependency_definition_spec.cr

@@ -46,8 +46,10 @@ module Shards
       # Path short syntax
       expect_parses("./#{local_relative}", "path", "./#{local_relative}", Any)
       expect_parses("../#{local_relative}", "path", "../#{local_relative}", Any)
-      expect_parses(".\\relative\\windows", "path", ".\\relative\\windows", Any)
-      expect_parses("..\\relative\\windows", "path", "..\\relative\\windows", Any)
+      {% if flag?(:windows) %}
+        expect_parses(".\\relative\\windows", "path", "./relative/windows", Any)
+        expect_parses("..\\relative\\windows", "path", "../relative/windows", Any)
+      {% end %}
       # Path file schema
       expect_parses("file://#{local_relative}", "path", local_relative, Any)
       expect_parses("file://#{local_absolute}", "path", local_absolute, Any)

src/dependency_definition.cr

@@ -55,9 +55,10 @@ module Shards
       end
 
       # relative paths
-      if value.starts_with?("./") || value.starts_with?("../") || value.starts_with?(".\\") || value.starts_with?("..\\")
+      path = Path[value].to_posix.to_s
+      if path.starts_with?("./") || path.starts_with?("../")
         resolver_key = "path"
-        source = value
+        source = path
       end
 
       uri = URI.parse(value)