add missing file

cmd/kubesql/config.go

@@ -0,0 +1,66 @@
+// Copyright 2020 Yaacov Zamir <[email protected]>
+// and other contributors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Author: 2020 Yaacov Zamir <[email protected]>
+
+// Package main.
+package main
+
+import (
+	"encoding/json"
+	"io/ioutil"
+)
+
+// User defined overides.
+type config struct {
+	Aliases     map[string]string `json:"aliases"`
+	TableFields tableFieldsMap    `json:"table-fields"`
+}
+
+// tableField describes how to print a table column.
+type tableField struct {
+	Title    string `json:"title"`
+	Name     string `json:"name"`
+	width    int
+	template string
+}
+
+type tableFields []tableField
+type tableFieldsMap map[string]tableFields
+
+// Read config file
+func readConfigFile(s string) {
+	file, err := ioutil.ReadFile(s)
+	errExit("Failed to read config file %v\n", err)
+
+	userConfig := config{}
+
+	err = json.Unmarshal([]byte(file), &userConfig)
+	errExit("Failed to unmarshal json config file %v\n", err)
+
+	// Merge user defined aliases into the default aliases map.
+	if len(userConfig.Aliases) > 0 {
+		for k, v := range userConfig.Aliases {
+			defaultAliases[k] = v
+		}
+	}
+
+	// Merge user defined tables into the default table headers.
+	if len(userConfig.TableFields) > 0 {
+		for k, v := range userConfig.TableFields {
+			defaultTableFields[k] = v
+		}
+	}
+}