feat(cask): add cask update command to manage cask formula

This will be used by the jimeh/homebrew-emacs-builds brew tap repository
in combination with brew livecheck to automatically update cask formulas
to the latest nightly builds from the jimeh/emacs-builds repository.

pkg/cli/cask.go

@@ -0,0 +1,149 @@
+package cli
+
+import (
+	"encoding/json"
+	"errors"
+	"os"
+
+	"github.com/jimeh/build-emacs-for-macos/pkg/cask"
+	"github.com/jimeh/build-emacs-for-macos/pkg/repository"
+	cli2 "github.com/urfave/cli/v2"
+)
+
+type caskOptions struct {
+	BuildsRepo  *repository.Repository
+	GithubToken string
+}
+
+func caskCmd() *cli2.Command {
+	tokenDefaultText := ""
+	if len(os.Getenv("GITHUB_TOKEN")) > 0 {
+		tokenDefaultText = "***"
+	}
+
+	return &cli2.Command{
+		Name:  "cask",
+		Usage: "manage Homebrew Cask formula",
+		Flags: []cli2.Flag{
+			&cli2.StringFlag{
+				Name:    "builds-repository",
+				Aliases: []string{"builds-repo", "b"},
+				Usage:   "owner/name of GitHub repo for containing builds",
+				EnvVars: []string{"EMACS_BUILDS_REPOSITORY"},
+				Value:   "jimeh/emacs-builds",
+			},
+			&cli2.StringFlag{
+				Name:        "github-token",
+				Usage:       "GitHub API Token",
+				EnvVars:     []string{"GITHUB_TOKEN"},
+				DefaultText: tokenDefaultText,
+				Required:    true,
+			},
+		},
+		Subcommands: []*cli2.Command{
+			caskUpdateCmd(),
+		},
+	}
+}
+
+func caskActionWrapper(
+	f func(*cli2.Context, *Options, *caskOptions) error,
+) func(*cli2.Context) error {
+	return actionWrapper(func(c *cli2.Context, opts *Options) error {
+		rOpts := &caskOptions{
+			GithubToken: c.String("github-token"),
+		}
+
+		if r := c.String("builds-repository"); r != "" {
+			var err error
+			rOpts.BuildsRepo, err = repository.NewGitHub(r)
+			if err != nil {
+				return err
+			}
+		}
+
+		return f(c, opts, rOpts)
+	})
+}
+
+func caskUpdateCmd() *cli2.Command {
+	return &cli2.Command{
+		Name:      "update",
+		Usage:     "update casks based on brew livecheck result in JSON format",
+		ArgsUsage: "<livecheck.json>",
+		Flags: []cli2.Flag{
+			&cli2.StringFlag{
+				Name: "ref",
+				Usage: "git ref to create/update casks on top of in the " +
+					"tap repository",
+				EnvVars: []string{"GITHUB_REF"},
+			},
+			&cli2.StringFlag{
+				Name:    "output",
+				Aliases: []string{"o"},
+				Usage:   "directory to write cask files to",
+			},
+			&cli2.StringFlag{
+				Name:    "tap-repository",
+				Aliases: []string{"tap"},
+				Usage: "owner/name of GitHub repo for Homebrew Tap to " +
+					"commit changes to if --output is not set",
+				EnvVars: []string{"GITHUB_REPOSITORY"},
+			},
+			&cli2.StringFlag{
+				Name:     "templates-dir",
+				Aliases:  []string{"t"},
+				Usage:    "path to directory of cask templates",
+				EnvVars:  []string{"CASK_TEMPLATE_DIR"},
+				Required: true,
+			},
+		},
+		Action: caskActionWrapper(caskUpdateAction),
+	}
+}
+
+func caskUpdateAction(
+	c *cli2.Context,
+	opts *Options,
+	cOpts *caskOptions,
+) error {
+	updateOpts := &cask.UpdateOptions{
+		BuildsRepo:   cOpts.BuildsRepo,
+		GithubToken:  cOpts.GithubToken,
+		Ref:          c.String("ref"),
+		OutputDir:    c.String("output"),
+		TemplatesDir: c.String("templates-dir"),
+	}
+
+	if r := c.String("tap-repository"); r != "" {
+		var err error
+		updateOpts.TapRepo, err = repository.NewGitHub(r)
+		if err != nil {
+			return err
+		}
+	}
+
+	arg := c.Args().First()
+	if arg == "" {
+		return errors.New("no livecheck argument given")
+	}
+
+	if arg == "-" {
+		err := json.NewDecoder(c.App.Reader).Decode(&updateOpts.LiveChecks)
+		if err != nil {
+			return err
+		}
+	} else {
+		f, err := os.Open(arg)
+		if err != nil {
+			return err
+		}
+
+		err = json.NewDecoder(f).Decode(&updateOpts.LiveChecks)
+		if err != nil {
+			return err
+		}
+	}
+
+	return cask.Update(c.Context, updateOpts)
+}

pkg/cli/cli.go

@@ -49,6 +49,7 @@ func New(version, commit, date string) *CLI {
 				notarizeCmd(),
 				packageCmd(),
 				releaseCmd(),
+				caskCmd(),
 				{
 					Name:    "version",
 					Usage:   "print the version",