Merge pull request #141 from gobuffalo/task-#96

Better wrapping for errors.

compiler.go

@@ -59,7 +59,7 @@ func (c *compiler) compile() (string, error) {
 			if c.curStmt != nil {
 				s = c.curStmt
 			}
-			return "", fmt.Errorf("line %d: %s", s.T().LineNumber, err)
+			return "", fmt.Errorf("line %d: %w", s.T().LineNumber, err)
 		}
 
 		c.write(bb, res)
@@ -768,7 +768,7 @@ func (c *compiler) evalCallExpression(node *ast.CallExpression) (interface{}, er
 	res := rv.Call(args)
 	if len(res) > 0 {
 		if e, ok := res[len(res)-1].Interface().(error); ok {
-			return nil, fmt.Errorf("could not call %s function: %s", node.Function, e)
+			return nil, fmt.Errorf("could not call %s function: %w", node.Function, e)
 		}
 		return res[0].Interface(), nil
 	}

error_test.go

@@ -0,0 +1,22 @@
+package plush
+
+import (
+	"database/sql"
+
+	"errors"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+func TestErrorType(t *testing.T) {
+	r := require.New(t)
+
+	ctx := NewContext()
+	ctx.Set("sqlError", func() error {
+		return sql.ErrNoRows
+	})
+
+	_, err := Render(`<%= sqlError() %>`, ctx)
+	r.True(errors.Is(err, sql.ErrNoRows))
+}