refactor: add sabliercmd pkg (#727)

This will enable doc generation

cmd/sablier/cmd.go

@@ -1,173 +1,14 @@
 package main
 
 import (
-	"errors"
-	"fmt"
-	"log/slog"
 	"os"
-	"strings"
-	"time"
 
-	"github.com/sablierapp/sablier/cmd/healthcheck"
-	"github.com/sablierapp/sablier/cmd/version"
-	"github.com/sablierapp/sablier/pkg/config"
-	"github.com/spf13/cobra"
-	"github.com/spf13/pflag"
-	"github.com/spf13/viper"
+	"github.com/sablierapp/sablier/pkg/sabliercmd"
 )
 
-const (
-	// The name of our config file, without the file extension because viper supports many different config file languages.
-	defaultConfigFilename = "sablier"
-)
-
-var conf = config.NewConfig()
-var cfgFile string
-
 func main() {
-	cmd := NewRootCommand()
+	cmd := sabliercmd.NewRootCommand()
 	if err := cmd.Execute(); err != nil {
 		os.Exit(1)
 	}
 }
-
-func NewRootCommand() *cobra.Command {
-	rootCmd := &cobra.Command{
-		Use:   "sablier",
-		Short: "A webserver to start container on demand",
-		Long: `Sablier is an API that start containers on demand.
-It provides an integrations with multiple reverse proxies and different loading strategies.`,
-		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
-			// You can bind cobra and viper in a few locations, but PersistencePreRunE on the root command works well
-			return initializeConfig(cmd)
-		},
-	}
-
-	rootCmd.PersistentFlags().StringVar(&cfgFile, "configFile", "", "Config file path. If not defined, looks for sablier.(yml|yaml|toml) in /etc/sablier/ > $XDG_CONFIG_HOME > $HOME/.config/ and current directory")
-
-	startCmd := newStartCommand()
-	// Provider flags
-	startCmd.Flags().StringVar(&conf.Provider.Name, "provider.name", "docker", fmt.Sprintf("Provider to use to manage containers %v", config.GetProviders()))
-	_ = viper.BindPFlag("provider.name", startCmd.Flags().Lookup("provider.name"))
-	startCmd.Flags().BoolVar(&conf.Provider.AutoStopOnStartup, "provider.auto-stop-on-startup", true, "")
-	_ = viper.BindPFlag("provider.auto-stop-on-startup", startCmd.Flags().Lookup("provider.auto-stop-on-startup"))
-	startCmd.Flags().Float32Var(&conf.Provider.Kubernetes.QPS, "provider.kubernetes.qps", 5, "QPS limit for K8S API access client-side throttling")
-	_ = viper.BindPFlag("provider.kubernetes.qps", startCmd.Flags().Lookup("provider.kubernetes.qps"))
-	startCmd.Flags().IntVar(&conf.Provider.Kubernetes.Burst, "provider.kubernetes.burst", 10, "Maximum burst for K8S API acees client-side throttling")
-	_ = viper.BindPFlag("provider.kubernetes.burst", startCmd.Flags().Lookup("provider.kubernetes.burst"))
-	startCmd.Flags().StringVar(&conf.Provider.Kubernetes.Delimiter, "provider.kubernetes.delimiter", "_", "Delimiter used for namespace/resource type/name resolution. Defaults to \"_\" for backward compatibility. But you should use \"/\" or \".\"")
-	_ = viper.BindPFlag("provider.kubernetes.delimiter", startCmd.Flags().Lookup("provider.kubernetes.delimiter"))
-	startCmd.Flags().StringVar(&conf.Provider.Podman.Uri, "provider.podman.uri", "unix:///run/podman/podman.sock", "Uri is the URI to connect to the Podman service.")
-	_ = viper.BindPFlag("provider.podman.uri", startCmd.Flags().Lookup("provider.podman.uri"))
-
-	// Server flags
-	startCmd.Flags().IntVar(&conf.Server.Port, "server.port", 10000, "The server port to use")
-	_ = viper.BindPFlag("server.port", startCmd.Flags().Lookup("server.port"))
-	startCmd.Flags().StringVar(&conf.Server.BasePath, "server.base-path", "/", "The base path for the API")
-	_ = viper.BindPFlag("server.base-path", startCmd.Flags().Lookup("server.base-path"))
-	// Storage flags
-	startCmd.Flags().StringVar(&conf.Storage.File, "storage.file", "", "File path to save the state")
-	_ = viper.BindPFlag("storage.file", startCmd.Flags().Lookup("storage.file"))
-	// Sessions flags
-	startCmd.Flags().DurationVar(&conf.Sessions.DefaultDuration, "sessions.default-duration", time.Duration(5)*time.Minute, "The default session duration")
-	_ = viper.BindPFlag("sessions.default-duration", startCmd.Flags().Lookup("sessions.default-duration"))
-	startCmd.Flags().DurationVar(&conf.Sessions.ExpirationInterval, "sessions.expiration-interval", time.Duration(20)*time.Second, "The expiration checking interval. Higher duration gives less stress on CPU. If you only use sessions of 1h, setting this to 5m is a good trade-off.")
-	_ = viper.BindPFlag("sessions.expiration-interval", startCmd.Flags().Lookup("sessions.expiration-interval"))
-
-	// logging level
-	rootCmd.PersistentFlags().StringVar(&conf.Logging.Level, "logging.level", strings.ToLower(slog.LevelInfo.String()), "The logging level. Can be one of [error, warn, info, debug]")
-	_ = viper.BindPFlag("logging.level", rootCmd.PersistentFlags().Lookup("logging.level"))
-
-	// strategy
-	startCmd.Flags().StringVar(&conf.Strategy.Dynamic.CustomThemesPath, "strategy.dynamic.custom-themes-path", "", "Custom themes folder, will load all .html files recursively")
-	_ = viper.BindPFlag("strategy.dynamic.custom-themes-path", startCmd.Flags().Lookup("strategy.dynamic.custom-themes-path"))
-	startCmd.Flags().StringVar(&conf.Strategy.Dynamic.DefaultTheme, "strategy.dynamic.default-theme", "hacker-terminal", "Default theme used for dynamic strategy")
-	_ = viper.BindPFlag("strategy.dynamic.default-theme", startCmd.Flags().Lookup("strategy.dynamic.default-theme"))
-	startCmd.Flags().BoolVar(&conf.Strategy.Dynamic.ShowDetailsByDefault, "strategy.dynamic.show-details-by-default", true, "Show the loading instances details by default")
-	_ = viper.BindPFlag("strategy.dynamic.show-details-by-default", startCmd.Flags().Lookup("strategy.dynamic.show-details-by-default"))
-	startCmd.Flags().DurationVar(&conf.Strategy.Dynamic.DefaultRefreshFrequency, "strategy.dynamic.default-refresh-frequency", 5*time.Second, "Default refresh frequency in the HTML page for dynamic strategy")
-	_ = viper.BindPFlag("strategy.dynamic.default-refresh-frequency", startCmd.Flags().Lookup("strategy.dynamic.default-refresh-frequency"))
-	startCmd.Flags().DurationVar(&conf.Strategy.Blocking.DefaultTimeout, "strategy.blocking.default-timeout", 1*time.Minute, "Default timeout used for blocking strategy")
-	_ = viper.BindPFlag("strategy.blocking.default-timeout", startCmd.Flags().Lookup("strategy.blocking.default-timeout"))
-	startCmd.Flags().DurationVar(&conf.Strategy.Blocking.DefaultRefreshFrequency, "strategy.blocking.default-refresh-frequency", 5*time.Second, "Default refresh frequency at which the instances status are checked for blocking strategy")
-	_ = viper.BindPFlag("strategy.blocking.default-refresh-frequency", startCmd.Flags().Lookup("strategy.blocking.default-refresh-frequency"))
-
-	rootCmd.AddCommand(startCmd)
-	rootCmd.AddCommand(version.NewCmd())
-
-	healthCmd := healthcheck.NewCmd()
-	healthCmd.Flags().String("url", "http://localhost:10000/health", "Sablier health endpoint")
-	rootCmd.AddCommand(healthCmd)
-
-	return rootCmd
-}
-
-func initializeConfig(cmd *cobra.Command) error {
-	v := viper.New()
-
-	// Set the base name of the config file, without the file extension.
-	v.SetConfigName(defaultConfigFilename)
-
-	v.AddConfigPath("/etc/sablier/")
-	v.AddConfigPath("$XDG_CONFIG_HOME")
-	v.AddConfigPath("$HOME/.config/")
-	v.AddConfigPath(".")
-
-	if cfgFile != "" {
-		v.SetConfigFile(cfgFile)
-	}
-
-	// Attempt to read the config file, gracefully ignoring errors
-	// caused by a config file not being found. Return an error
-	// if we cannot parse the config file.
-	if err := v.ReadInConfig(); err != nil {
-		// It's okay if there isn't a config file
-		var configFileNotFoundError viper.ConfigFileNotFoundError
-		if !errors.As(err, &configFileNotFoundError) {
-			return err
-		}
-	}
-
-	// Bind to environment variables
-	// Works great for simple config names, but needs help for names
-	// like --favorite-color which we fix in the bindFlags function
-	v.AutomaticEnv()
-
-	// Bind the current command's flags to viper
-	bindFlags(cmd, v)
-
-	return nil
-}
-
-// Bind each cobra flag to its associated viper configuration (config file and environment variable)
-func bindFlags(cmd *cobra.Command, v *viper.Viper) {
-	cmd.Flags().VisitAll(func(f *pflag.Flag) {
-		envVarSuffix := strings.ToUpper(strings.ReplaceAll(f.Name, "-", "_"))
-		envVarSuffix = strings.ToUpper(strings.ReplaceAll(envVarSuffix, ".", "_"))
-		_ = v.BindEnv(f.Name, envVarSuffix)
-
-		// Apply the viper config value to the flag when the flag is not set and viper has a value
-		if !f.Changed && v.IsSet(f.Name) {
-			val := v.Get(f.Name)
-			_ = cmd.Flags().Set(f.Name, fmt.Sprintf("%v", val))
-		}
-	})
-}
-
-var newStartCommand = func() *cobra.Command {
-	return &cobra.Command{
-		Use:   "start",
-		Short: "Start the Sablier server",
-		Run: func(cmd *cobra.Command, args []string) {
-			err := viper.Unmarshal(&conf)
-			if err != nil {
-				panic(err)
-			}
-
-			err = Start(cmd.Context(), conf)
-			if err != nil {
-				panic(err)
-			}
-		},
-	}
-}

pkg/sabliercmd/cmd_test.go

@@ -1,4 +1,4 @@
-package main
+package sabliercmd_test
 
 import (
 	"bufio"
@@ -9,8 +9,7 @@ import (
 	"strings"
 	"testing"
 
-	"github.com/sablierapp/sablier/pkg/config"
-
+	"github.com/sablierapp/sablier/pkg/sabliercmd"
 	"github.com/spf13/cobra"
 	"github.com/spf13/viper"
 	"github.com/stretchr/testify/require"
@@ -25,11 +24,12 @@ func TestDefault(t *testing.T) {
 	require.NoError(t, err, "error reading test config file")
 
 	// CHANGE `startCmd` behavior to only print the config, this is for testing purposes only
-	newStartCommand = mockStartCommand
+	sabliercmd.SetStartCommand(mockStartCommand)
+	defer sabliercmd.ResetStartCommand()
 
 	t.Run("config file", func(t *testing.T) {
-		conf = config.NewConfig()
-		cmd := NewRootCommand()
+		sabliercmd.ResetConfig()
+		cmd := sabliercmd.NewRootCommand()
 		output := &bytes.Buffer{}
 		cmd.SetOut(output)
 		cmd.SetArgs([]string{
@@ -48,14 +48,15 @@ func TestPrecedence(t *testing.T) {
 	require.NoError(t, err, "error getting the current working directory")
 
 	// CHANGE `startCmd` behavior to only print the config, this is for testing purposes only
-	newStartCommand = mockStartCommand
+	sabliercmd.SetStartCommand(mockStartCommand)
+	defer sabliercmd.ResetStartCommand()
 
 	t.Run("config file", func(t *testing.T) {
 		wantConfig, err := os.ReadFile(filepath.Join(testDir, "testdata", "config_yaml_wanted.json"))
 		require.NoError(t, err, "error reading test config file")
 
-		conf = config.NewConfig()
-		cmd := NewRootCommand()
+		sabliercmd.ResetConfig()
+		cmd := sabliercmd.NewRootCommand()
 		output := &bytes.Buffer{}
 		cmd.SetOut(output)
 		cmd.SetArgs([]string{
@@ -76,8 +77,8 @@ func TestPrecedence(t *testing.T) {
 		wantConfig, err := os.ReadFile(filepath.Join(testDir, "testdata", "config_env_wanted.json"))
 		require.NoError(t, err, "error reading test config file")
 
-		conf = config.NewConfig()
-		cmd := NewRootCommand()
+		sabliercmd.ResetConfig()
+		cmd := sabliercmd.NewRootCommand()
 		output := &bytes.Buffer{}
 		cmd.SetOut(output)
 		cmd.SetArgs([]string{
@@ -98,9 +99,9 @@ func TestPrecedence(t *testing.T) {
 		wantConfig, err := os.ReadFile(filepath.Join(testDir, "testdata", "config_cli_wanted.json"))
 		require.NoError(t, err, "error reading test config file")
 
-		cmd := NewRootCommand()
+		cmd := sabliercmd.NewRootCommand()
 		output := &bytes.Buffer{}
-		conf = config.NewConfig()
+		sabliercmd.ResetConfig()
 		cmd.SetOut(output)
 		cmd.SetArgs([]string{
 			"--configFile", filepath.Join(testDir, "testdata", "config.yml"),
@@ -174,7 +175,8 @@ func mockStartCommand() *cobra.Command {
 		Use:   "start",
 		Short: "InstanceStart the Sablier server",
 		Run: func(cmd *cobra.Command, args []string) {
-			_ = viper.Unmarshal(&conf)
+			conf := sabliercmd.GetConfig()
+			_ = viper.Unmarshal(conf)
 
 			out := cmd.OutOrStdout()
 

pkg/sabliercmd/healthcheck.go

@@ -1,11 +1,12 @@
-package healthcheck
+package sabliercmd
 
 import (
 	"fmt"
-	"github.com/spf13/cobra"
 	"io"
 	"net/http"
 	"os"
+
+	"github.com/spf13/cobra"
 )
 
 const (
@@ -33,7 +34,7 @@ func Health(url string) (string, bool) {
 	return string(body), healthy
 }
 
-func NewCmd() *cobra.Command {
+func NewHealthCmd() *cobra.Command {
 	return &cobra.Command{
 		Use:   "health",
 		Short: "Calls the health endpoint of a Sablier instance",

pkg/sabliercmd/logger.go

@@ -1,12 +1,13 @@
-package main
+package sabliercmd
 
 import (
-	"github.com/lmittmann/tint"
-	"github.com/sablierapp/sablier/pkg/config"
 	"log/slog"
 	"os"
 	"strings"
 	"time"
+
+	"github.com/lmittmann/tint"
+	"github.com/sablierapp/sablier/pkg/config"
 )
 
 func setupLogger(config config.Logging) *slog.Logger {

pkg/sabliercmd/provider.go

@@ -1,8 +1,10 @@
-package main
+package sabliercmd
 
 import (
 	"context"
 	"fmt"
+	"log/slog"
+
 	"github.com/containers/podman/v5/pkg/bindings"
 	"github.com/docker/docker/client"
 	"github.com/sablierapp/sablier/pkg/config"
@@ -13,7 +15,6 @@ import (
 	"github.com/sablierapp/sablier/pkg/sablier"
 	k8s "k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/rest"
-	"log/slog"
 )
 
 func setupProvider(ctx context.Context, logger *slog.Logger, config config.Provider) (sablier.Provider, error) {

pkg/sabliercmd/root.go

@@ -0,0 +1,146 @@
+package sabliercmd
+
+import (
+	"errors"
+	"fmt"
+	"log/slog"
+	"strings"
+	"time"
+
+	"github.com/sablierapp/sablier/pkg/config"
+	"github.com/spf13/cobra"
+	"github.com/spf13/pflag"
+	"github.com/spf13/viper"
+)
+
+const (
+	// The name of our config file, without the file extension because viper supports many different config file languages.
+	defaultConfigFilename = "sablier"
+)
+
+var conf = config.NewConfig()
+var cfgFile string
+
+// NewRootCommand creates the root cobra command
+func NewRootCommand() *cobra.Command {
+	rootCmd := &cobra.Command{
+		Use:   "sablier",
+		Short: "A webserver to start container on demand",
+		Long: `Sablier is an API that starts containers on demand.
+It provides integrations with multiple reverse proxies and different loading strategies.`,
+		PersistentPreRunE: func(cmd *cobra.Command, args []string) error {
+			// You can bind cobra and viper in a few locations, but PersistencePreRunE on the root command works well
+			return initializeConfig(cmd)
+		},
+	}
+
+	rootCmd.PersistentFlags().StringVar(&cfgFile, "configFile", "", "Config file path. If not defined, looks for sablier.(yml|yaml|toml) in /etc/sablier/ > $XDG_CONFIG_HOME > $HOME/.config/ and current directory")
+
+	startCmd := newStartCommand()
+	// Provider flags
+	startCmd.Flags().StringVar(&conf.Provider.Name, "provider.name", "docker", fmt.Sprintf("Provider to use to manage containers %v", config.GetProviders()))
+	_ = viper.BindPFlag("provider.name", startCmd.Flags().Lookup("provider.name"))
+	startCmd.Flags().BoolVar(&conf.Provider.AutoStopOnStartup, "provider.auto-stop-on-startup", true, "")
+	_ = viper.BindPFlag("provider.auto-stop-on-startup", startCmd.Flags().Lookup("provider.auto-stop-on-startup"))
+	startCmd.Flags().Float32Var(&conf.Provider.Kubernetes.QPS, "provider.kubernetes.qps", 5, "QPS limit for K8S API access client-side throttling")
+	_ = viper.BindPFlag("provider.kubernetes.qps", startCmd.Flags().Lookup("provider.kubernetes.qps"))
+	startCmd.Flags().IntVar(&conf.Provider.Kubernetes.Burst, "provider.kubernetes.burst", 10, "Maximum burst for K8S API acees client-side throttling")
+	_ = viper.BindPFlag("provider.kubernetes.burst", startCmd.Flags().Lookup("provider.kubernetes.burst"))
+	startCmd.Flags().StringVar(&conf.Provider.Kubernetes.Delimiter, "provider.kubernetes.delimiter", "_", "Delimiter used for namespace/resource type/name resolution. Defaults to \"_\" for backward compatibility. But you should use \"/\" or \".\"")
+	_ = viper.BindPFlag("provider.kubernetes.delimiter", startCmd.Flags().Lookup("provider.kubernetes.delimiter"))
+	startCmd.Flags().StringVar(&conf.Provider.Podman.Uri, "provider.podman.uri", "unix:///run/podman/podman.sock", "Uri is the URI to connect to the Podman service.")
+	_ = viper.BindPFlag("provider.podman.uri", startCmd.Flags().Lookup("provider.podman.uri"))
+
+	// Server flags
+	startCmd.Flags().IntVar(&conf.Server.Port, "server.port", 10000, "The server port to use")
+	_ = viper.BindPFlag("server.port", startCmd.Flags().Lookup("server.port"))
+	startCmd.Flags().StringVar(&conf.Server.BasePath, "server.base-path", "/", "The base path for the API")
+	_ = viper.BindPFlag("server.base-path", startCmd.Flags().Lookup("server.base-path"))
+	// Storage flags
+	startCmd.Flags().StringVar(&conf.Storage.File, "storage.file", "", "File path to save the state")
+	_ = viper.BindPFlag("storage.file", startCmd.Flags().Lookup("storage.file"))
+	// Sessions flags
+	startCmd.Flags().DurationVar(&conf.Sessions.DefaultDuration, "sessions.default-duration", time.Duration(5)*time.Minute, "The default session duration")
+	_ = viper.BindPFlag("sessions.default-duration", startCmd.Flags().Lookup("sessions.default-duration"))
+	startCmd.Flags().DurationVar(&conf.Sessions.ExpirationInterval, "sessions.expiration-interval", time.Duration(20)*time.Second, "The expiration checking interval. Higher duration gives less stress on CPU. If you only use sessions of 1h, setting this to 5m is a good trade-off.")
+	_ = viper.BindPFlag("sessions.expiration-interval", startCmd.Flags().Lookup("sessions.expiration-interval"))
+
+	// logging level
+	rootCmd.PersistentFlags().StringVar(&conf.Logging.Level, "logging.level", strings.ToLower(slog.LevelInfo.String()), "The logging level. Can be one of [error, warn, info, debug]")
+	_ = viper.BindPFlag("logging.level", rootCmd.PersistentFlags().Lookup("logging.level"))
+
+	// strategy
+	startCmd.Flags().StringVar(&conf.Strategy.Dynamic.CustomThemesPath, "strategy.dynamic.custom-themes-path", "", "Custom themes folder, will load all .html files recursively")
+	_ = viper.BindPFlag("strategy.dynamic.custom-themes-path", startCmd.Flags().Lookup("strategy.dynamic.custom-themes-path"))
+	startCmd.Flags().StringVar(&conf.Strategy.Dynamic.DefaultTheme, "strategy.dynamic.default-theme", "hacker-terminal", "Default theme used for dynamic strategy")
+	_ = viper.BindPFlag("strategy.dynamic.default-theme", startCmd.Flags().Lookup("strategy.dynamic.default-theme"))
+	startCmd.Flags().BoolVar(&conf.Strategy.Dynamic.ShowDetailsByDefault, "strategy.dynamic.show-details-by-default", true, "Show the loading instances details by default")
+	_ = viper.BindPFlag("strategy.dynamic.show-details-by-default", startCmd.Flags().Lookup("strategy.dynamic.show-details-by-default"))
+	startCmd.Flags().DurationVar(&conf.Strategy.Dynamic.DefaultRefreshFrequency, "strategy.dynamic.default-refresh-frequency", 5*time.Second, "Default refresh frequency in the HTML page for dynamic strategy")
+	_ = viper.BindPFlag("strategy.dynamic.default-refresh-frequency", startCmd.Flags().Lookup("strategy.dynamic.default-refresh-frequency"))
+	startCmd.Flags().DurationVar(&conf.Strategy.Blocking.DefaultTimeout, "strategy.blocking.default-timeout", 1*time.Minute, "Default timeout used for blocking strategy")
+	_ = viper.BindPFlag("strategy.blocking.default-timeout", startCmd.Flags().Lookup("strategy.blocking.default-timeout"))
+	startCmd.Flags().DurationVar(&conf.Strategy.Blocking.DefaultRefreshFrequency, "strategy.blocking.default-refresh-frequency", 5*time.Second, "Default refresh frequency at which the instances status are checked for blocking strategy")
+	_ = viper.BindPFlag("strategy.blocking.default-refresh-frequency", startCmd.Flags().Lookup("strategy.blocking.default-refresh-frequency"))
+
+	rootCmd.AddCommand(startCmd)
+	rootCmd.AddCommand(NewVersionCmd())
+
+	healthCmd := NewHealthCmd()
+	healthCmd.Flags().String("url", "http://localhost:10000/health", "Sablier health endpoint")
+	rootCmd.AddCommand(healthCmd)
+
+	return rootCmd
+}
+
+func initializeConfig(cmd *cobra.Command) error {
+	v := viper.New()
+
+	// Set the base name of the config file, without the file extension.
+	v.SetConfigName(defaultConfigFilename)
+
+	v.AddConfigPath("/etc/sablier/")
+	v.AddConfigPath("$XDG_CONFIG_HOME")
+	v.AddConfigPath("$HOME/.config/")
+	v.AddConfigPath(".")
+
+	if cfgFile != "" {
+		v.SetConfigFile(cfgFile)
+	}
+
+	// Attempt to read the config file, gracefully ignoring errors
+	// caused by a config file not being found. Return an error
+	// if we cannot parse the config file.
+	if err := v.ReadInConfig(); err != nil {
+		// It's okay if there isn't a config file
+		var configFileNotFoundError viper.ConfigFileNotFoundError
+		if !errors.As(err, &configFileNotFoundError) {
+			return err
+		}
+	}
+
+	// Bind to environment variables
+	// Works great for simple config names, but needs help for names
+	// like --favorite-color which we fix in the bindFlags function
+	v.AutomaticEnv()
+
+	// Bind the current command's flags to viper
+	bindFlags(cmd, v)
+
+	return nil
+}
+
+// Bind each cobra flag to its associated viper configuration (config file and environment variable)
+func bindFlags(cmd *cobra.Command, v *viper.Viper) {
+	cmd.Flags().VisitAll(func(f *pflag.Flag) {
+		envVarSuffix := strings.ToUpper(strings.ReplaceAll(f.Name, "-", "_"))
+		envVarSuffix = strings.ToUpper(strings.ReplaceAll(envVarSuffix, ".", "_"))
+		_ = v.BindEnv(f.Name, envVarSuffix)
+
+		// Apply the viper config value to the flag when the flag is not set and viper has a value
+		if !f.Changed && v.IsSet(f.Name) {
+			val := v.Get(f.Name)
+			_ = cmd.Flags().Set(f.Name, fmt.Sprintf("%v", val))
+		}
+	})
+}

pkg/sabliercmd/start.go

@@ -1,21 +1,42 @@
-package main
+package sabliercmd
 
 import (
 	"context"
 	"fmt"
-	"github.com/sablierapp/sablier/internal/api"
-	"github.com/sablierapp/sablier/pkg/config"
-	"github.com/sablierapp/sablier/pkg/sablier"
-	"github.com/sablierapp/sablier/pkg/store/inmemory"
-	"github.com/sablierapp/sablier/pkg/version"
 	"log/slog"
 	"os/signal"
 	"syscall"
 	"time"
 
+	"github.com/sablierapp/sablier/internal/api"
 	"github.com/sablierapp/sablier/internal/server"
+	"github.com/sablierapp/sablier/pkg/config"
+	"github.com/sablierapp/sablier/pkg/sablier"
+	"github.com/sablierapp/sablier/pkg/store/inmemory"
+	"github.com/sablierapp/sablier/pkg/version"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
 )
 
+var newStartCommand = func() *cobra.Command {
+	return &cobra.Command{
+		Use:   "start",
+		Short: "Start the Sablier server",
+		Run: func(cmd *cobra.Command, args []string) {
+			err := viper.Unmarshal(&conf)
+			if err != nil {
+				panic(err)
+			}
+
+			err = Start(cmd.Context(), conf)
+			if err != nil {
+				panic(err)
+			}
+		},
+	}
+}
+
+// Start starts the Sablier server
 func Start(ctx context.Context, conf config.Config) error {
 	// Create context that listens for the interrupt signal from the OS.
 	ctx, stop := signal.NotifyContext(ctx, syscall.SIGINT, syscall.SIGTERM)

pkg/sabliercmd/testing.go

@@ -0,0 +1,29 @@
+package sabliercmd
+
+import (
+	"github.com/sablierapp/sablier/pkg/config"
+	"github.com/spf13/cobra"
+)
+
+// NewStartCommand is a variable that allows mocking the start command for testing
+var NewStartCommand = newStartCommand
+
+// SetStartCommand allows tests to override the start command
+func SetStartCommand(cmd func() *cobra.Command) {
+	newStartCommand = cmd
+}
+
+// ResetStartCommand resets the start command to the default
+func ResetStartCommand() {
+	newStartCommand = NewStartCommand
+}
+
+// GetConfig returns the current configuration (for testing)
+func GetConfig() *config.Config {
+	return &conf
+}
+
+// ResetConfig resets the configuration to a new instance (for testing)
+func ResetConfig() {
+	conf = config.NewConfig()
+}

pkg/sabliercmd/theme.go

@@ -1,11 +1,12 @@
-package main
+package sabliercmd
 
 import (
 	"context"
-	"github.com/sablierapp/sablier/pkg/config"
-	"github.com/sablierapp/sablier/pkg/theme"
 	"log/slog"
 	"os"
+
+	"github.com/sablierapp/sablier/pkg/config"
+	"github.com/sablierapp/sablier/pkg/theme"
 )
 
 func setupTheme(ctx context.Context, conf config.Config, logger *slog.Logger) (*theme.Themes, error) {

pkg/sabliercmd/version.go

@@ -1,13 +1,14 @@
-package version
+package sabliercmd
 
 import (
 	"fmt"
+
 	"github.com/sablierapp/sablier/pkg/version"
 
 	"github.com/spf13/cobra"
 )
 
-func NewCmd() *cobra.Command {
+func NewVersionCmd() *cobra.Command {
 	return &cobra.Command{
 		Use:   "version",
 		Short: "Print the version Sablier",