diskii/cmd/decode.go

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// Copyright © 2016 Zellyn Hunter <zellyn@gmail.com>
package cmd
import (
"fmt"
"os"
"github.com/spf13/cobra"
"github.com/zellyn/diskii/lib/applesoft"
"github.com/zellyn/diskii/lib/helpers"
)
var location uint16 // flag for starting location in memory
var rawControlCodes bool // flag for whether to skip escaping control codes
// decodeCmd represents the decode command
var decodeCmd = &cobra.Command{
Use: "decode filename",
Short: "convert a binary applesoft program to a LISTing",
Long: `
decode converts a binary Applesoft program to a text LISTing.
Examples:
decode filename # read filename
decode - # read stdin`,
Run: func(cmd *cobra.Command, args []string) {
if err := runDecode(args); err != nil {
fmt.Fprintln(os.Stderr, err.Error())
os.Exit(-1)
}
},
}
// runDecode performs the actual decode logic.
func runDecode(args []string) error {
if len(args) != 1 {
return fmt.Errorf("decode expects one argument: the filename (or - for stdin)")
}
contents, err := helpers.FileContentsOrStdIn(args[0])
if err != nil {
return err
}
listing, err := applesoft.Decode(contents, location)
if err != nil {
return err
}
if rawControlCodes {
os.Stdout.WriteString(listing.String())
} else {
os.Stdout.WriteString(applesoft.ChevronControlCodes(listing.String()))
}
return nil
}
func init() {
applesoftCmd.AddCommand(decodeCmd)
// Here you will define your flags and configuration settings.
// Cobra supports Persistent Flags which will work for this command
// and all subcommands, e.g.:
// decodeCmd.PersistentFlags().String("foo", "", "A help for foo")
decodeCmd.Flags().Uint16VarP(&location, "location", "l", 0x801, "Starting program location in memory")
decodeCmd.Flags().BoolVarP(&rawControlCodes, "raw", "r", false, "Print raw control codes (no escaping)")
}