Dependency updates

vendor/github.com/gobuffalo/gogen/add_import.go

@@ -0,0 +1,52 @@
+package gogen
+
+import (
+	"fmt"
+	"go/ast"
+	"go/token"
+	"strings"
+
+	"github.com/gobuffalo/genny"
+	"github.com/pkg/errors"
+)
+
+// AddImport adds n number of import statements into the path provided
+func AddImport(gf genny.File, imports ...string) (genny.File, error) {
+	pf, err := ParseFile(gf)
+	if err != nil {
+		return gf, errors.WithStack(err)
+	}
+	gf = pf.File
+
+	end := findLastImport(pf.Ast, pf.FileSet, pf.Lines)
+
+	x := make([]string, len(imports), len(imports)+2)
+	for _, i := range imports {
+		x = append(x, fmt.Sprintf("\t\"%s\"", i))
+
+	}
+	if end < 0 {
+		x = append([]string{"import ("}, x...)
+		x = append(x, ")")
+	}
+
+	pf.Lines = append(pf.Lines[:end], append(x, pf.Lines[end:]...)...)
+
+	fileContent := strings.Join(pf.Lines, "\n")
+	return genny.NewFile(gf.Name(), strings.NewReader(fileContent)), nil
+}
+
+func findLastImport(f *ast.File, fset *token.FileSet, fileLines []string) int {
+	var end = -1
+
+	ast.Inspect(f, func(n ast.Node) bool {
+		switch x := n.(type) {
+		case *ast.ImportSpec:
+			end = fset.Position(x.End()).Line
+			return true
+		}
+		return true
+	})
+
+	return end
+}