feat: use cobra to run the app

internal/howmuch/howmuch.go

@@ -0,0 +1,74 @@
+// MIT License
+//
+// Copyright (c) 2024 vinchent <vinchent@vinchent.xyz>
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+
+package howmuch
+
+import (
+	"fmt"
+	"net/http"
+
+	"github.com/gin-gonic/gin"
+	"github.com/spf13/cobra"
+)
+
+func errArgsForNoArgCommand(cmd string, args string) error {
+	return fmt.Errorf("%q does not take any argument, got %q", cmd, args)
+}
+
+// NewHowMuchCommand creates the root command.
+func NewHowMuchCommand() *cobra.Command {
+	rootCmd := &cobra.Command{
+		Use:   "howmuch",
+		Short: "howmuch is a expense-sharing application",
+		Long: `howmuch is a expense-sharing application that can help friends
+to share their expense of an event or a trip`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return run()
+		},
+		Args: func(cmd *cobra.Command, args []string) error {
+			for _, args := range args {
+				if len(args) > 0 {
+					return errArgsForNoArgCommand(cmd.CommandPath(), args)
+				}
+			}
+			return nil
+		},
+		SilenceUsage: true,
+	}
+	return rootCmd
+}
+
+func run() error {
+	fmt.Println("How much do I owe you?")
+
+	r := gin.Default()
+
+	r.GET("/", func(ctx *gin.Context) {
+		ctx.JSON(http.StatusOK, gin.H{
+			"message": "how much?",
+		})
+	})
+
+	r.Run(":8080")
+
+	return nil
+}