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|
package main
import (
"flag"
"fmt"
"os"
"github.com/n-peugnet/dna-backup/logger"
)
type command struct {
Flag *flag.FlagSet
Usage string
Help string
Run func([]string) error
}
const (
name = "dna-backup"
baseUsage = "<command> [<options>] [--] <args>"
commitUsage = "[<options>] [--] <source> <dest>"
commitHelp = "Create a new version of folder <source> into repo <dest>"
restoreUsage = "[<options>] [--] <source> <dest>"
restoreHelp = "Restore the last version from repo <source> into folder <dest>"
)
var (
logLevel int
commitCmd = flag.NewFlagSet("commit", flag.ExitOnError)
restoreCmd = flag.NewFlagSet("restore", flag.ExitOnError)
subcommands = map[string]command{
commitCmd.Name(): {commitCmd, commitUsage, commitHelp, commitMain},
restoreCmd.Name(): {restoreCmd, restoreUsage, restoreHelp, restoreMain},
}
)
func init() {
// init default help message
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "usage: %s %s\n\ncommands:\n", name, baseUsage)
for _, s := range subcommands {
fmt.Printf(" %s %s\n", s.Flag.Name(), s.Help)
}
os.Exit(1)
}
// setup subcommands
for _, s := range subcommands {
s.Flag.IntVar(&logLevel, "v", 3, "log verbosity level (0-4)")
}
}
func main() {
flag.Parse()
args := flag.Args()
if len(args) < 1 {
flag.Usage()
}
cmd, exists := subcommands[args[0]]
if !exists {
fmt.Fprintf(flag.CommandLine.Output(), "error: unknown command %s\n\n", args[0])
flag.Usage()
}
cmd.Flag.Usage = func() {
fmt.Fprintf(cmd.Flag.Output(), "usage: %s %s %s\n\noptions:\n", name, cmd.Flag.Name(), cmd.Usage)
cmd.Flag.PrintDefaults()
os.Exit(1)
}
cmd.Flag.Parse(args[1:])
logger.Init(logLevel)
if err := cmd.Run(cmd.Flag.Args()); err != nil {
fmt.Fprintf(cmd.Flag.Output(), "error: %s\n\n", err)
cmd.Flag.Usage()
}
}
func commitMain(args []string) error {
if len(args) != 2 {
return fmt.Errorf("wrong number of args")
}
source := args[0]
dest := args[1]
repo := NewRepo(dest)
repo.Commit(source)
return nil
}
func restoreMain(args []string) error {
if len(args) != 2 {
return fmt.Errorf("wrong number args")
}
source := args[0]
dest := args[1]
repo := NewRepo(source)
repo.Restore(dest)
return nil
}
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