213 lines
4.1 KiB
Go
213 lines
4.1 KiB
Go
package main
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import (
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"context"
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"encoding/json"
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"errors"
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"flag"
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"fmt"
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"io/fs"
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"os"
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"sort"
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"strings"
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"github.com/adrg/xdg"
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"github.com/peterbourgon/ff/v3"
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"github.com/peterbourgon/ff/v3/ffcli"
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)
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var Version = "develop"
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func main() {
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defaultStore, err := xdg.ConfigFile("kv/store.json")
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if err != nil {
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defaultStore = "store.json"
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}
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fs := flag.NewFlagSet("kv", flag.ContinueOnError)
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storeFlag := fs.String("store", defaultStore, "Location of the store on disk")
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fs.StringVar(storeFlag, "s", *storeFlag, "--store")
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a := &app{
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storeLocation: storeFlag,
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}
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var app *ffcli.Command
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app = &ffcli.Command{
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Name: "kv",
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ShortUsage: fmt.Sprintf("Key/Value store - version %s", Version),
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ShortHelp: "kv [get|set|del|list] ...",
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FlagSet: fs,
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Subcommands: []*ffcli.Command{
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a.get(),
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a.set(),
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a.del(),
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a.list(),
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},
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Options: []ff.Option{
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ff.WithEnvVarPrefix("KV"),
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},
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Exec: func(_ context.Context, _ []string) error {
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return errors.New(app.UsageFunc(app))
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},
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}
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if err := app.ParseAndRun(context.Background(), os.Args[1:]); err != nil {
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if errors.Is(err, flag.ErrHelp) {
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return
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}
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fmt.Println(err)
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}
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}
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type app struct {
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storeLocation *string
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}
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func (a *app) get() *ffcli.Command {
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fs := flag.NewFlagSet("get", flag.ContinueOnError)
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return &ffcli.Command{
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Name: "get",
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FlagSet: fs,
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Exec: func(ctx context.Context, args []string) error {
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if len(args) < 1 {
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return errors.New("get requires at least one argument")
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}
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data, err := a.load()
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if err != nil {
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return err
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}
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key := strings.ToLower(strings.Join(args, " "))
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val, ok := data[key]
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if !ok {
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return fmt.Errorf("no value found for %q", key)
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}
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fmt.Print(val)
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return nil
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},
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}
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}
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func (a *app) set() *ffcli.Command {
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fs := flag.NewFlagSet("set", flag.ContinueOnError)
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return &ffcli.Command{
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Name: "set",
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FlagSet: fs,
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Exec: func(ctx context.Context, args []string) error {
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if len(args) < 2 {
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return errors.New("set requires at least two arguments")
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}
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data, err := a.load()
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if err != nil {
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return err
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}
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key := args[0]
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data[key] = strings.Join(args[1:], " ")
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if err := a.save(data); err != nil {
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return err
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}
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fmt.Printf("set %q\n", key)
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return nil
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},
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}
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}
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func (a *app) del() *ffcli.Command {
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fs := flag.NewFlagSet("del", flag.ContinueOnError)
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return &ffcli.Command{
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Name: "del",
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FlagSet: fs,
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Exec: func(ctx context.Context, args []string) error {
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if len(args) < 1 {
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return errors.New("del requires at least 1 argument")
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}
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data, err := a.load()
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if err != nil {
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return err
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}
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key := strings.ToLower(strings.Join(args, " "))
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if _, ok := data[key]; !ok {
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return fmt.Errorf("no value found for %q", key)
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}
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delete(data, key)
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if err := a.save(data); err != nil {
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return err
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}
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fmt.Printf("deleted %q\n", key)
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return nil
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},
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}
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}
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func (a *app) list() *ffcli.Command {
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fs := flag.NewFlagSet("list", flag.ContinueOnError)
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return &ffcli.Command{
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Name: "list",
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FlagSet: fs,
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Exec: func(ctx context.Context, args []string) error {
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data, err := a.load()
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if err != nil {
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return err
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}
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var keys []string
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prefix := strings.ToLower(strings.Join(args, " "))
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for key := range data {
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if strings.HasPrefix(key, prefix) {
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keys = append(keys, key)
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}
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}
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sort.Strings(keys)
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for _, key := range keys {
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fmt.Println(key)
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}
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return nil
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},
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}
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}
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func (a *app) load() (map[string]string, error) {
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var m map[string]string
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fi, err := os.Open(*a.storeLocation)
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if err != nil {
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if errors.Is(err, fs.ErrNotExist) {
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fi, err = os.Create(*a.storeLocation)
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if err != nil {
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return m, err
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}
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if _, err := fi.WriteString("{}"); err != nil {
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return m, err
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}
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if err := fi.Close(); err != nil {
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return m, err
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}
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return a.load()
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}
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return m, err
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}
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defer fi.Close()
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return m, json.NewDecoder(fi).Decode(&m)
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}
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func (a *app) save(m map[string]string) error {
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fi, err := os.Create(*a.storeLocation)
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if err != nil {
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return err
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}
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defer fi.Close()
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enc := json.NewEncoder(fi)
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enc.SetIndent("", "\t")
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return enc.Encode(&m)
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}
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