feat: order/delay in service files, enable cmd, --all on unit commands

- install/uninstall/start/stop/enable take <name> or --all; *all kept as shortcuts
- add enable (enable at boot + start); startall no longer enables
- order/delay resolved by config.ResolveOrder and written into systemd,
  OpenRC and runit service files (After=/sleep), so they apply at boot
- install --all stops and disables units before removing their files
- update regenerates all installed, enabled units and removes disabled ones
- edit creates the config dir; docs and man page updated
- tests: fake Init for cmd, ResolveOrder, backend ordering output

cmd/start.go

@@ -2,49 +2,52 @@ package cmd
 
 import (
 	"fmt"
+	"io"
+	"os"
 
 	"github.com/spf13/cobra"
 	"github.com/warkanum/unitdore/config"
 	"github.com/warkanum/unitdore/initsys"
 )
 
+var startAll bool
+
 var startCmd = &cobra.Command{
-	Use:   "start <name>",
-	Short: "Start a unit by name",
-	Args:  cobra.ExactArgs(1),
-	RunE:  runStart,
+	Use:   "start <name> | --all",
+	Short: "Start a unit by name (or all with --all)",
+	Long: `Start starts the named installed unit without enabling it at boot.
+
+With --all (same as 'startall') it starts every enabled, installed unit in
+startup order: equal 'order' values in parallel, groups one after another.
+'delay' is waited inside the generated service.`,
+	Args: nameOrAll(&startAll),
+	RunE: func(cmd *cobra.Command, args []string) error {
+		cfg, ini, err := loadInit()
+		if err != nil {
+			return err
+		}
+		if startAll {
+			bulkStart(cfg, ini, os.Stdout, initsys.Init.Start, "started")
+			return nil
+		}
+		return startOne(cfg, ini, args[0], os.Stdout)
+	},
 }
 
 func init() {
+	startCmd.Flags().BoolVar(&startAll, "all", false, "start all enabled, installed units")
 	rootCmd.AddCommand(startCmd)
 }
 
-func runStart(cmd *cobra.Command, args []string) error {
-	cfg, err := config.Load(configPath)
+func startOne(cfg *config.Config, ini initsys.Init, name string, w io.Writer) error {
+	u, err := installedUnit(cfg, ini, name)
 	if err != nil {
 		return err
 	}
-
-	name := args[0]
-	u := cfg.FindUnit(name)
-	if u == nil {
-		return fmt.Errorf("unit %q not found", name)
-	}
-
-	prefix, suffix := cfg.Prefix, cfg.Suffix
-	ini, err := initsys.New(cfg)
-	if err != nil {
+	fmt.Fprintf(w, "  ▶ starting %s...\n", ini.ServiceName(*u, cfg.Prefix, cfg.Suffix))
+	if err := ini.Start(*u, cfg.Prefix, cfg.Suffix); err != nil {
 		return err
 	}
-
-	if !ini.IsInstalled(*u, prefix, suffix) {
-		return fmt.Errorf("%s is not installed — run 'unitdore install' first", name)
-	}
-
-	fmt.Printf("  ▶ starting %s...\n", ini.ServiceName(*u, prefix, suffix))
-	if err := ini.Start(*u, prefix, suffix); err != nil {
-		return err
-	}
-	fmt.Printf("  ✓ started: %s\n", name)
+	fmt.Fprintf(w, "  ✓ started: %s\n", name)
 	return nil
 }