Add deps init command

cmd/deps/init.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"github.com/dropseed/deps/internal/output"
+
+	"github.com/dropseed/deps/internal/config"
+	"github.com/spf13/cobra"
+)
+
+var initCmd = &cobra.Command{
+	Use:   "init",
+	Short: "Create a deps config in the current",
+	Run: func(cmd *cobra.Command, args []string) {
+		cfg, err := config.InferredConfigFromDir(".")
+		if err != nil {
+			printErrAndExitFailure(err)
+		}
+		inferred, err := cfg.DumpYAML()
+		if err != nil {
+			printErrAndExitFailure(err)
+		}
+
+		filename := config.DefaultFilenames[0]
+
+		if _, err := os.Stat(filename); !os.IsNotExist(err) {
+			printErrAndExitFailure(fmt.Errorf("%s already exists!", filename))
+		}
+
+		fmt.Printf("Generating config...\n\n%s\n", inferred)
+
+		err = ioutil.WriteFile(filename, []byte(inferred), 0644)
+		if err != nil {
+			printErrAndExitFailure(err)
+		}
+		output.Success("✔ saved as %s", filename)
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(initCmd)
+}