Merge pull request #76 from mnottale/inspect-nicer

inspect: Nicer output, also dump settings.

Author: mnottale

cmd/inspect.go

@@ -2,7 +2,7 @@ package cmd
 
 import (
 	"github.com/docker/cli/cli"
-	"github.com/docker/lunchbox/packager"
+	"github.com/docker/lunchbox/renderer"
 	"github.com/spf13/cobra"
 )
 
@@ -12,7 +12,7 @@ var inspectCmd = &cobra.Command{
 	Short: "Retrieve metadata for a given app package",
 	Args:  cli.RequiresMaxArgs(1),
 	RunE: func(cmd *cobra.Command, args []string) error {
-		return packager.Inspect(firstOrEmpty(args))
+		return renderer.Inspect(firstOrEmpty(args))
 	},
 }
 

packager/inspect.go

@@ -0,0 +1,55 @@
+package renderer
+
+import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+	"text/tabwriter"
+
+	"github.com/docker/lunchbox/packager"
+	"github.com/docker/lunchbox/types"
+	yaml "gopkg.in/yaml.v2"
+)
+
+// Inspect dumps the metadata of an app
+func Inspect(appname string) error {
+	appname, cleanup, err := packager.Extract(appname)
+	if err != nil {
+		return err
+	}
+	defer cleanup()
+	metaFile := filepath.Join(appname, "metadata.yml")
+	metaContent, err := ioutil.ReadFile(metaFile)
+	if err != nil {
+		return err
+	}
+	var meta types.AppMetadata
+	err = yaml.Unmarshal(metaContent, &meta)
+	if err != nil {
+		return err
+	}
+	// extract settings
+	settingsFile := filepath.Join(appname, "settings.yml")
+	settingsContent, err := ioutil.ReadFile(settingsFile)
+	if err != nil {
+		return err
+	}
+	settings, err := flattenYAML(settingsContent)
+	if err != nil {
+		return err
+	}
+	fmt.Printf("%s %s\n", meta.Name, meta.Version)
+	fmt.Printf("Maintained by: %s\n", meta.Author)
+	fmt.Println("")
+	fmt.Printf("%s\n", meta.Description)
+	fmt.Println("")
+	w := tabwriter.NewWriter(os.Stdout, 0, 0, 1, ' ', 0)
+	fmt.Fprintln(w, "Setting\tDefault")
+	fmt.Fprintln(w, "-------\t-------")
+	for k, v := range settings {
+		fmt.Fprintf(w, "%s\t%s\n", k, v)
+	}
+	w.Flush()
+	return nil
+}

renderer/inspect.go

@@ -17,6 +17,19 @@ import (
 	"gopkg.in/yaml.v2"
 )
 
+//flattenYAML reads a YAML file and return a flattened view
+func flattenYAML(content []byte) (map[string]string, error) {
+	in := make(map[interface{}]interface{})
+	if err := yaml.Unmarshal(content, in); err != nil {
+		return nil, err
+	}
+	out := make(map[string]interface{})
+	merge(out, in)
+	res := make(map[string]string)
+	flatten(out, res, "")
+	return res, nil
+}
+
 // flatten flattens a structure: foo.bar.baz -> foo_bar_baz
 func flatten(in map[string]interface{}, out map[string]string, prefix string) {
 	for k, v := range in {