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