simplify

cmd/root.go

@@ -1,12 +1,18 @@
 package cmd
 
 import (
+	"fmt"
 	"os"
+	"strconv"
 
+	u "github.com/bcicen/go-units"
 	"github.com/spf13/cobra"
 )
 
-var rootCmd = &cobra.Command{
+var (
+	from    string
+	to      string
+	rootCmd = &cobra.Command{
 		Use:   "converter",
 		Short: "A brief description of your application",
 		Long: `A longer description that spans multiple lines and likely contains
@@ -15,7 +21,32 @@ examples and usage of using your application. For example:
 Cobra is a CLI library for Go that empowers applications.
 This application is a tool to generate the needed files
 to quickly create a Cobra application.`,
+		Run: func(cmd *cobra.Command, args []string) {
+			in, err := strconv.ParseFloat(args[0], 64)
+			if err != nil {
+				fmt.Println(err.Error())
+				return
 			}
+			fromVal, err := u.Find(cmd.Flag("from").Value.String())
+			if err != nil {
+				fmt.Println(err.Error())
+				return
+			}
+			toVal, err := u.Find(cmd.Flag("to").Value.String())
+			if err != nil {
+				fmt.Println(err.Error())
+				return
+			}
+			val := u.NewValue(in, fromVal)
+			out, err := val.Convert(toVal)
+			if err != nil {
+				fmt.Println(err.Error())
+				return
+			}
+			fmt.Println(out.String())
+		},
+	}
+)
 
 func Execute() {
 	err := rootCmd.Execute()
@@ -23,3 +54,8 @@ func Execute() {
 		os.Exit(1)
 	}
 }
+
+func init() {
+	rootCmd.PersistentFlags().StringVarP(&from, "from", "f", "c", "unit system to convert from")
+	rootCmd.PersistentFlags().StringVarP(&to, "to", "t", "f", "unit system to convert to")
+}

cmd/temp.go

@@ -1,77 +0,0 @@
-package cmd
-
-import (
-	"fmt"
-	"strconv"
-	"strings"
-
-	u "github.com/bcicen/go-units"
-	"github.com/spf13/cobra"
-)
-
-var (
-	from    string
-	to      string
-	tempCmd = &cobra.Command{
-		Use:     "temperature",
-		Aliases: []string{"temp", "t", "temps"},
-		Short:   "A brief description of your command",
-		Long: `A longer description that spans multiple lines and likely contains examples
-and usage of using your command. For example:
-
-Cobra is a CLI library for Go that empowers applications.
-This application is a tool to generate the needed files
-to quickly create a Cobra application.`,
-		Args: cobra.MatchAll(cobra.ExactArgs(1)),
-		RunE: func(cmd *cobra.Command, args []string) error {
-			err := cmd.ParseFlags(args)
-			if err != nil {
-				return err
-			}
-			in, err := strconv.ParseFloat(args[0], 64)
-			if err != nil {
-				return err
-			}
-			fromFlag := strings.ToLower(cmd.Flag("from").Value.String())
-			toFlag := strings.ToLower(cmd.Flag("to").Value.String())
-			var out u.Value
-			switch fromFlag {
-			case "f", "farenheit":
-				out, err = Convert(in, toFlag, u.Fahrenheit)
-				if err != nil {
-					return err
-				}
-			case "c", "celsius":
-				out, err = Convert(in, toFlag, u.Celsius)
-				if err != nil {
-					return err
-				}
-			case "k", "kelvin":
-				out, err = Convert(in, toFlag, u.Kelvin)
-				if err != nil {
-					return err
-				}
-			}
-			fmt.Println(out.String())
-			return nil
-		},
-	}
-)
-
-func Convert(in float64, to string, from u.Unit) (u.Value, error) {
-	switch to {
-	case "f", "farenheit":
-		return u.ConvertFloat(in, from, u.Fahrenheit)
-	case "c", "celsius":
-		return u.ConvertFloat(in, from, u.Celsius)
-	case "k", "kelvin":
-		return u.ConvertFloat(in, from, u.Kelvin)
-	}
-	return u.Value{}, fmt.Errorf("Invalid flags provided")
-}
-
-func init() {
-	rootCmd.AddCommand(tempCmd)
-	tempCmd.PersistentFlags().StringVarP(&from, "from", "f", "c", "unit system to convert from, (farenheit, celsius, kelvin)")
-	tempCmd.PersistentFlags().StringVarP(&to, "to", "t", "f", "unit system to convert to, (farenheit, celsius, kelvin)")
-}