refactor: Rewrote in golang.

cmd/check.go

@@ -0,0 +1,51 @@
+package cmd
+
+import (
+	"os"
+
+	"github.com/olekukonko/tablewriter"
+	"github.com/sbrow/envr/app"
+	"github.com/spf13/cobra"
+)
+
+var checkCmd = &cobra.Command{
+	Use:   "check",
+	Short: "Check for missing binaries",
+	Long: `envr relies on external binaries for certain functionality.
+
+The check command reports on which binaries are available and which are not.`,
+	RunE: func(cmd *cobra.Command, args []string) error {
+		db, err := app.Open()
+		if err != nil {
+			return err
+		} else {
+			defer db.Close(app.ReadOnly)
+			features := db.Features()
+
+			table := tablewriter.NewWriter(os.Stdout)
+			table.Header([]string{"Feature", "Status"})
+
+			// Check Git
+			if features&app.Git == 1 {
+				table.Append([]string{"Git", "✓ Available"})
+			} else {
+				table.Append([]string{"Git", "✗ Missing"})
+			}
+
+			// Check fd
+			if features&app.Fd == 1 {
+				table.Append([]string{"fd", "✓ Available"})
+			} else {
+				table.Append([]string{"fd", "✗ Missing"})
+			}
+
+			table.Render()
+
+			return nil
+		}
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(checkCmd)
+}