fix(help): add HTTP serve subcommand

cmd/core/help/cmd.go

@@ -9,6 +9,10 @@ import (
 	"github.com/spf13/cobra"
 )
 
+var startHelpServer = func(catalog *gohelp.Catalog, addr string) error {
+	return gohelp.NewServer(catalog, addr).ListenAndServe()
+}
+
 func AddHelpCommands(root *cli.Command) {
 	var searchQuery string
 
@@ -37,6 +41,18 @@ func AddHelpCommands(root *cli.Command) {
 		},
 	}
 
+	var serveAddr string
+	serveCmd := &cli.Command{
+		Use:   "serve",
+		Short: "Serve help documentation over HTTP",
+		Args:  cobra.NoArgs,
+		RunE: func(cmd *cli.Command, args []string) error {
+			return startHelpServer(gohelp.DefaultCatalog(), serveAddr)
+		},
+	}
+	serveCmd.Flags().StringVar(&serveAddr, "addr", ":8080", "HTTP listen address")
+
+	helpCmd.AddCommand(serveCmd)
 	helpCmd.Flags().StringVarP(&searchQuery, "search", "s", "", "Search help topics")
 	root.AddCommand(helpCmd)
 }

cmd/core/help/cmd_test.go

@@ -59,6 +59,30 @@ func TestAddHelpCommands_Good(t *testing.T) {
 	assert.Contains(t, out, topics[0].ID)
 }
 
+func TestAddHelpCommands_Good_Serve(t *testing.T) {
+	root := &cli.Command{Use: "core"}
+	AddHelpCommands(root)
+
+	cmd, _, err := root.Find([]string{"help", "serve"})
+	require.NoError(t, err)
+	require.NotNil(t, cmd)
+
+	oldStart := startHelpServer
+	defer func() { startHelpServer = oldStart }()
+
+	var gotAddr string
+	startHelpServer = func(catalog *gohelp.Catalog, addr string) error {
+		require.NotNil(t, catalog)
+		gotAddr = addr
+		return nil
+	}
+
+	require.NoError(t, cmd.Flags().Set("addr", "127.0.0.1:9090"))
+	err = cmd.RunE(cmd, nil)
+	require.NoError(t, err)
+	assert.Equal(t, "127.0.0.1:9090", gotAddr)
+}
+
 func TestRenderSearchResults_Good(t *testing.T) {
 	out := captureOutput(t, func() {
 		err := renderSearchResults([]*gohelp.SearchResult{