Use vendor when building (#201)

* Use vendor code for all go calls

* Add missing vendor dependencies

* Add travis_retry to yarn install

* Fix go test call

vendor/github.com/99designs/gqlgen/internal/code/util.go

@@ -0,0 +1,56 @@
+package code
+
+import (
+	"go/build"
+	"os"
+	"path/filepath"
+	"regexp"
+	"strings"
+)
+
+// take a string in the form github.com/package/blah.Type and split it into package and type
+func PkgAndType(name string) (string, string) {
+	parts := strings.Split(name, ".")
+	if len(parts) == 1 {
+		return "", name
+	}
+
+	return strings.Join(parts[:len(parts)-1], "."), parts[len(parts)-1]
+}
+
+var modsRegex = regexp.MustCompile(`^(\*|\[\])*`)
+
+// NormalizeVendor takes a qualified package path and turns it into normal one.
+// eg .
+// github.com/foo/vendor/github.com/99designs/gqlgen/graphql becomes
+// github.com/99designs/gqlgen/graphql
+func NormalizeVendor(pkg string) string {
+	modifiers := modsRegex.FindAllString(pkg, 1)[0]
+	pkg = strings.TrimPrefix(pkg, modifiers)
+	parts := strings.Split(pkg, "/vendor/")
+	return modifiers + parts[len(parts)-1]
+}
+
+// QualifyPackagePath takes an import and fully qualifies it with a vendor dir, if one is required.
+// eg .
+// github.com/99designs/gqlgen/graphql becomes
+// github.com/foo/vendor/github.com/99designs/gqlgen/graphql
+//
+// x/tools/packages only supports 'qualified package paths' so this will need to be done prior to calling it
+// See https://github.com/golang/go/issues/30289
+func QualifyPackagePath(importPath string) string {
+	wd, _ := os.Getwd()
+
+	pkg, err := build.Import(importPath, wd, 0)
+	if err != nil {
+		return importPath
+	}
+
+	return pkg.ImportPath
+}
+
+var invalidPackageNameChar = regexp.MustCompile(`[^\w]`)
+
+func SanitizePackageName(pkg string) string {
+	return invalidPackageNameChar.ReplaceAllLiteralString(filepath.Base(pkg), "_")
+}