Add support to install requred and optional tools (#117)

pkg/cmd/init.go

@@ -0,0 +1,53 @@
+package cmd
+
+import (
+	"github.com/linuxsuren/http-downloader/pkg/installer"
+	"github.com/spf13/cobra"
+	"runtime"
+)
+
+type initOption struct {
+	require, optional, fetch bool
+
+	// inner fields
+	requireTools, optionalTools map[string]string
+}
+
+// NewInitCommand returns a command for init
+func NewInitCommand(requireTools, optionalTools map[string]string) (cmd *cobra.Command) {
+	opt := &initOption{
+		requireTools:  requireTools,
+		optionalTools: optionalTools,
+	}
+
+	cmd = &cobra.Command{
+		Use:   "init",
+		Short: "Init your command",
+		RunE:  opt.runE,
+	}
+
+	flags := cmd.Flags()
+	flags.BoolVarP(&opt.require, "require", "r", true,
+		"Indicate if you want to install required tools")
+	flags.BoolVarP(&opt.optional, "optional", "o", false,
+		"Indicate if you want to install optional tools")
+	flags.BoolVarP(&opt.fetch, "fetch", "", true,
+		"Indicate if fetch the latest config of tools")
+	return
+}
+
+func (o *initOption) runE(_ *cobra.Command, _ []string) (err error) {
+	is := installer.Installer{
+		Provider: "github",
+		OS:       runtime.GOOS,
+		Arch:     runtime.GOARCH,
+		Fetch:    o.fetch,
+	}
+	if o.require {
+		err = is.CheckDepAndInstall(o.requireTools)
+	}
+	if err == nil && o.optional {
+		err = is.CheckDepAndInstall(o.optionalTools)
+	}
+	return
+}