feat: add explicit flag / arg definitions

cli/build.go

@@ -1,21 +1,27 @@
 package cli
 
 import (
+	"fmt"
 	"github.com/spf13/cobra"
 	"log"
 	podman "spud/podman"
 	service_definition "spud/service_definition"
 )
 
-var build = &cobra.Command{
+func getBuildCommand() *cobra.Command {
+	build := &cobra.Command{
 		Use:   "build",
 		Short: "Build service images.",
-	Run: func(cmd *cobra.Command, args []string) {
-		pathProvided := args[0]
+		RunE: func(cmd *cobra.Command, args []string) error {
+			pathProvided, err := cmd.PersistentFlags().GetString("definition")
+
+			if err != nil {
+				return fmt.Errorf("%+v", err)
+			}
 			def, err := service_definition.GetServiceDefinitionFromFile(pathProvided)
 
 			if err != nil {
-			log.Fatal(err)
+				return fmt.Errorf("Failed to read service definition from file: %+v", err)
 			}
 
 			imagesToBuild := def.Build.Images
@@ -27,5 +33,11 @@ var build = &cobra.Command{
 			for _, imageDef := range imagesToBuild {
 				podman.Build(imageDef)
 			}
+			return nil
 		},
 	}
+	build.PersistentFlags().StringP("definition", "d", "./service.yml", "Path to the service definition to use.")
+
+	return build
+
+}

cli/build_test.go

@@ -0,0 +1,37 @@
+package cli
+
+import (
+	"github.com/spf13/cobra"
+	"testing"
+)
+
+func TestCliBuildServiceDefinitionPathMustExist(t *testing.T) {
+	cli := GetCli()
+
+	cli.SetArgs([]string{"build", "-d", "./not-a-file.yml"})
+
+	outcome := cli.Execute()
+
+	if outcome == nil {
+		t.Errorf("Expected error, got nil.")
+	}
+}
+
+func TestCliBuildDefaultsServiceDefinitionPath(t *testing.T) {
+	cli := GetCli()
+
+	cli.SetArgs([]string{"build"})
+
+	startCommand, _, _ := cli.Find([]string{"build"})
+
+	startCommand.RunE = func(cmd *cobra.Command, args []string) error {
+		actual, _ := cmd.PersistentFlags().GetString("definition")
+		if actual != "./service.yml" {
+			t.Errorf("Unexpected default value for 'definition' / 'd' arg: %s", actual)
+		}
+
+		return nil
+	}
+
+	cli.Execute()
+}

cli/cli.go

@@ -5,15 +5,6 @@ import (
 	"github.com/spf13/cobra"
 )
 
-var allCommands = []*cobra.Command{
-	// cli/start_service.go
-	start,
-	// cli/stop_service.go
-	stop,
-	// cli/build.go
-	build,
-}
-
 // Creates the root of the CLI, with all available commands
 // added to it.
 func GetCli() *cobra.Command {
@@ -22,6 +13,15 @@ func GetCli() *cobra.Command {
 		Short: "A not-entirely-terrible-way to manage self-hosted services.",
 	}
 
+	allCommands := []*cobra.Command{
+		// cli/start_service.go
+		getStartCommand(),
+		// cli/stop_service.go
+		getStopCommand(),
+		// cli/build.go
+		getBuildCommand(),
+	}
+
 	for _, command := range allCommands {
 		cli.AddCommand(command)
 	}

cli/start_service.go

@@ -5,23 +5,36 @@
 package cli
 
 import (
+	"fmt"
 	"github.com/spf13/cobra"
-	"log"
 	service "spud/service"
 	service_definition "spud/service_definition"
 )
 
-var start = &cobra.Command{
+func getStartCommand() *cobra.Command {
+	start := &cobra.Command{
 		Use:   "start",
 		Short: "Creates or updates a service based on the provided definition.",
-	Run: func(cmd *cobra.Command, args []string) {
-		pathProvided := args[0]
+		RunE: func(cmd *cobra.Command, args []string) error {
+			pathProvided, err := cmd.PersistentFlags().GetString("definition")
+
+			if err != nil {
+				return fmt.Errorf("%+v", err)
+			}
+
 			def, err := service_definition.GetServiceDefinitionFromFile(pathProvided)
 
 			if err != nil {
-			log.Fatal(err)
+				return fmt.Errorf("Failed to read service definition from file: %+v", err)
 			}
 
 			service.CreateService(def)
+
+			return nil
 		},
 	}
+
+	start.PersistentFlags().StringP("definition", "d", "./service.yml", "Path to the service definition to use.")
+
+	return start
+}

cli/start_service_test.go

@@ -0,0 +1,37 @@
+package cli
+
+import (
+	"github.com/spf13/cobra"
+	"testing"
+)
+
+func TestCliStartServiceDefinitionPathMustExist(t *testing.T) {
+	cli := GetCli()
+
+	cli.SetArgs([]string{"start", "-d", "./not-a-file.yml"})
+
+	outcome := cli.Execute()
+
+	if outcome == nil {
+		t.Errorf("Expected error, got nil.")
+	}
+}
+
+func TestCliStartDefaultsServiceDefinitionPath(t *testing.T) {
+	cli := GetCli()
+
+	cli.SetArgs([]string{"start"})
+
+	startCommand, _, _ := cli.Find([]string{"start"})
+
+	startCommand.RunE = func(cmd *cobra.Command, args []string) error {
+		actual, _ := cmd.PersistentFlags().GetString("definition")
+		if actual != "./service.yml" {
+			t.Errorf("Unexpected default value for 'definition' / 'd' arg: %s", actual)
+		}
+
+		return nil
+	}
+
+	cli.Execute()
+}

cli/stop_service.go

@@ -4,15 +4,27 @@
 package cli
 
 import (
+	"fmt"
 	"github.com/spf13/cobra"
 	service "spud/service"
 )
 
-var stop = &cobra.Command{
-	Use:   "stop",
+func getStopCommand() *cobra.Command {
+	stop := &cobra.Command{
+		Use:   "stop [service-name]",
 		Short: "Stops a running service and all of its containers.",
-	Run: func(cmd *cobra.Command, args []string) {
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if len(args) == 0 {
+				return fmt.Errorf("Must specify a service using '--service'")
+			}
+
 			serviceName := args[0]
+
 			service.StopService(serviceName)
+
+			return nil
 		},
 	}
+
+	return stop
+}

cli/stop_service_test.go

@@ -0,0 +1,17 @@
+package cli
+
+import (
+	"testing"
+)
+
+func TestCliStopRequiresAServiceName(t *testing.T) {
+	cli := GetCli()
+
+	cli.SetArgs([]string{"stop"})
+
+	outcome := cli.Execute()
+
+	if outcome == nil {
+		t.Error("Expected error, got nil.")
+	}
+}

main.go

@@ -1,9 +1,12 @@
 package main
 
 import (
+	"os"
 	cli "spud/cli"
 )
 
 func main() {
-	cli.GetCli().Execute()
+	if err := cli.GetCli().Execute(); err != nil {
+		os.Exit(1)
+	}
 }