internal/function: registry of functions

Signed-off-by: Miguel Molina <[email protected]>

Author: erizocosmico

cmd/gitquery/query_base.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/src-d/gitquery"
 	"github.com/src-d/gitquery/internal/format"
+	"github.com/src-d/gitquery/internal/function"
 
 	"gopkg.in/src-d/go-git.v4/utils/ioutil"
 	sqle "gopkg.in/src-d/go-mysql-server.v0"
@@ -38,7 +39,7 @@ func (c *cmdQueryBase) buildDatabase() error {
 	}
 
 	c.engine.AddDatabase(gitquery.NewDatabase(c.name, &pool))
-	return err
+	return function.Register(c.engine.Catalog)
 }
 
 func (c *cmdQueryBase) executeQuery(sql string) (sql.Schema, sql.RowIter, error) {

internal/function/registry.go

@@ -0,0 +1,19 @@
+package function
+
+import "gopkg.in/src-d/go-mysql-server.v0/sql"
+
+var functions = map[string]interface{}{
+	"is_tag":    NewIsTag,
+	"is_remote": NewIsRemote,
+}
+
+// Register all the gitquery functions in the SQL catalog.
+func Register(c *sql.Catalog) error {
+	for k, v := range functions {
+		if err := c.RegisterFunction(k, v); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}

internal/function/registry_test.go

@@ -0,0 +1,19 @@
+package function
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+	"gopkg.in/src-d/go-mysql-server.v0/sql"
+)
+
+func TestRegister(t *testing.T) {
+	require := require.New(t)
+	catalog := sql.NewCatalog()
+	require.NoError(Register(catalog))
+
+	for fn := range functions {
+		_, err := catalog.Function(fn)
+		require.NoError(err, "expected to find function: %s", fn)
+	}
+}