Control TUI, port, config with env vars

src/cmd/root.go

@@ -3,8 +3,11 @@ package cmd
 import (
 	"github.com/f1bonacc1/process-compose/src/api"
 	"github.com/f1bonacc1/process-compose/src/loader"
+	"github.com/rs/zerolog/log"
 	"github.com/spf13/cobra"
 	"os"
+	"strconv"
+	"strings"
 )
 
 var (
@@ -17,12 +20,19 @@ var (
 		Use:   "process-compose",
 		Short: "Processes scheduler and orchestrator",
 		Run: func(cmd *cobra.Command, args []string) {
+			if !cmd.Flags().Changed("tui") {
+				isTui = getTuiDefault()
+			}
 			api.StartHttpServer(!isTui, port)
 			runProject([]string{}, false)
 		},
 	}
 )
 
+const (
+	defaultPortNum = 8080
+)
+
 // Execute adds all child commands to the root command and sets flags appropriately.
 // This is called by main.main(). It only needs to happen once to the rootCmd.
 func Execute() {
@@ -36,7 +46,34 @@ func init() {
 	opts = &loader.LoaderOptions{
 		FileNames: []string{},
 	}
+
 	rootCmd.Flags().BoolVarP(&isTui, "tui", "t", true, "disable tui (-t=false)")
-	rootCmd.PersistentFlags().IntVarP(&port, "port", "p", 8080, "port number")
-	rootCmd.PersistentFlags().StringArrayVarP(&opts.FileNames, "config", "f", []string{}, "path to config files to load")
+	rootCmd.PersistentFlags().IntVarP(&port, "port", "p", getPortDefault(), "port number")
+	rootCmd.PersistentFlags().StringArrayVarP(&opts.FileNames, "config", "f", getConfigDefault(), "path to config files to load")
+}
+
+func getTuiDefault() bool {
+	_, found := os.LookupEnv("PC_DISABLE_TUI")
+	return !found
+}
+
+func getPortDefault() int {
+	val, found := os.LookupEnv("PC_PORT_NUM")
+	if found {
+		port, err := strconv.Atoi(val)
+		if err != nil {
+			log.Fatal().Msgf("Invalid port number: %s", val)
+			return defaultPortNum
+		}
+		return port
+	}
+	return defaultPortNum
+}
+
+func getConfigDefault() []string {
+	val, found := os.LookupEnv("PC_CONFIG_FILES")
+	if found {
+		return strings.Split(val, ",")
+	}
+	return []string{}
 }