feat(release): initial attempt at providing automatic builds

cmd/github-release/check_cmd.go

@@ -0,0 +1,47 @@
+package main
+
+import (
+	"fmt"
+	"regexp"
+
+	"github.com/urfave/cli/v2"
+)
+
+var nonAlphaNum = regexp.MustCompile(`[^\w-_]+`)
+
+var checkCmd = &cli.Command{
+	Name:      "check",
+	Usage:     "Check if GitHub release and asset exists",
+	UsageText: "github-release [global options] check [options]",
+	Action:    actionHandler(checkAction),
+}
+
+func checkAction(c *cli.Context, opts *globalOptions) error {
+	gh := opts.gh
+	repo := opts.repo
+	plan := opts.plan
+	releaseName := plan.ReleaseName()
+
+	fmt.Printf(
+		"Checking github.com/%s for release: %s\n",
+		repo.String(), releaseName,
+	)
+
+	release, _, err := gh.Repositories.GetReleaseByTag(
+		c.Context, repo.Owner, repo.Name, releaseName,
+	)
+	if err != nil {
+		return err
+	}
+
+	filename := plan.ReleaseAsset()
+
+	fmt.Printf("checking release for asset: %s\n", filename)
+	for _, a := range release.Assets {
+		if a.Name != nil && filename == *a.Name {
+			return nil
+		}
+	}
+
+	return fmt.Errorf("release does contain asset: %s", filename)
+}