Add show command shyiko#510

command/show.go

@@ -0,0 +1,104 @@
+package command
+
+import (
+	"fmt"
+	"net/url"
+	"runtime"
+	"strings"
+
+	"github.com/shyiko/jabba/semver"
+	"github.com/spf13/pflag"
+)
+
+const notAvailable = "Not Available"
+
+type versionInfo struct {
+	name             string
+	isInstalled      bool
+	downloadURL      string
+	javaMajorVersion string
+	vendor           string
+	err              error
+}
+
+func newVeriosnInfo(selector string) *versionInfo {
+	return &versionInfo{name: selector,
+		isInstalled:      false,
+		downloadURL:      notAvailable,
+		vendor:           notAvailable,
+		javaMajorVersion: notAvailable,
+	}
+}
+
+func (v *versionInfo) formatString() string {
+	templ := "%s\n" +
+		"  Installed:\t\t%s\n" +
+		"  DownloadUrl:\t\t%s\n" +
+		"  JavaMajorVersion:\t%s\n" +
+		"  Vendor:\t\t%s\n"
+	isInstalled := "No"
+	if v.isInstalled {
+		isInstalled = "Yes"
+	}
+	return fmt.Sprintf(templ, v.name, isInstalled, v.downloadURL, v.javaMajorVersion, v.vendor)
+}
+
+// Show prints the information about given slelectors
+func Show(args []string) error {
+	if len(args) == 0 {
+		return pflag.ErrHelp
+	}
+	for _, s := range args {
+		info := getVersionInfoFor(s)
+		if info.err != nil {
+			fmt.Printf("%s: %s\n", s, info.err)
+		} else {
+			fmt.Println(info.formatString())
+		}
+	}
+
+	return nil
+}
+
+// This is a wrapper for Ls which allow to mock Ls functionality for tests
+var ls = func() ([]*semver.Version, error) { return Ls() }
+
+// This is a wrapper for Ls which allow to mock LsRemote functionality for tests
+var lsRemote = func() (map[*semver.Version]string, error) {
+	return LsRemote(runtime.GOOS, runtime.GOARCH)
+}
+
+func getVersionInfoFor(selector string) *versionInfo {
+	ver, err := semver.ParseVersion(selector)
+	if err != nil {
+		return &versionInfo{err: fmt.Errorf("%s is not a valid version", selector)}
+	}
+	info := newVeriosnInfo(selector)
+	installed, err := ls()
+	for _, v := range installed {
+		if v.Equals(ver) {
+			info.isInstalled = true
+			info.javaMajorVersion = fmt.Sprintf("%d.%d", v.Major(), v.Minor())
+		}
+	}
+	releaseMap, _ := lsRemote()
+	for v, url := range releaseMap {
+		if v.Equals(ver) {
+			info.downloadURL = strings.Join(strings.Split(url, "+")[1:], "")
+			info.vendor = getVendor(info.downloadURL)
+			info.javaMajorVersion = fmt.Sprintf("%d.%d", v.Major(), v.Minor())
+		}
+	}
+	return info
+}
+
+func getVendor(uri string) string {
+	u, err := url.Parse(uri)
+	if err != nil {
+		return ""
+	}
+	parts := strings.Split(u.Hostname(), ".")
+	fmt.Println(parts)
+	domain := parts[len(parts)-2] + "." + parts[len(parts)-1]
+	return domain
+}

jabba.go

@@ -150,6 +150,15 @@ func main() {
 			return nil
 		},
 	}
+	showCmd := &cobra.Command{
+		Use:   "show [name]",
+		Short: "Show information about given version",
+		RunE: func(cmd *cobra.Command, args []string) error {
+			return command.Show(args)
+		},
+		Example: "  jabba show openjdk@1.12.0\n" +
+			"  jabba show 1.12.0 openjdk@1.9.0",
+	}
 	lsRemoteCmd := &cobra.Command{
 		Use:   "ls-remote",
 		Short: "List remote versions available for install",
@@ -282,6 +291,7 @@ func main() {
 			},
 		},
 		lsCmd,
+		showCmd,
 		lsRemoteCmd,
 		&cobra.Command{
 			Use:   "deactivate",