feat(01-01): boot hello app and dispatch greeter:hello

- Add party plugin registry with Register-before-Boot activation
- Add backpack, compass, bonfire, and pact capability interfaces
- Add examples/hello with two compiled plugin modules

.gitignore

@@ -1,5 +1,6 @@
 # Go
 /bin/
+/examples/hello/bin/
 /dist/
 *.test
 *.out

backpack/app.go

@@ -0,0 +1,13 @@
+package backpack
+
+import "git.golem15.com/golem15/summercms/compass"
+
+// App is the per-instance application container. It must not import party.
+type App struct {
+	Config *compass.Config
+}
+
+// New returns an App that owns cfg.
+func New(cfg *compass.Config) *App {
+	return &App{Config: cfg}
+}

backpack/app_test.go

@@ -0,0 +1,37 @@
+package backpack
+
+import (
+	"go/parser"
+	"go/token"
+	"os"
+	"strconv"
+	"strings"
+	"testing"
+)
+
+func TestDoesNotImportParty(t *testing.T) {
+	entries, err := os.ReadDir(".")
+	if err != nil {
+		t.Fatal(err)
+	}
+	fset := token.NewFileSet()
+	for _, entry := range entries {
+		name := entry.Name()
+		if entry.IsDir() || !strings.HasSuffix(name, ".go") || strings.HasSuffix(name, "_test.go") {
+			continue
+		}
+		file, err := parser.ParseFile(fset, name, nil, parser.ImportsOnly)
+		if err != nil {
+			t.Fatal(err)
+		}
+		for _, spec := range file.Imports {
+			path, err := strconv.Unquote(spec.Path.Value)
+			if err != nil {
+				t.Fatal(err)
+			}
+			if path == "git.golem15.com/golem15/summercms/party" {
+				t.Fatalf("%s imports party", name)
+			}
+		}
+	}
+}

bonfire/command.go

@@ -0,0 +1,110 @@
+package bonfire
+
+import (
+	"context"
+	"fmt"
+	"io"
+
+	"github.com/spf13/cobra"
+)
+
+// Command is a console command value collected from plugins or the tool.
+type Command struct {
+	Name        string
+	Description string
+	Flags       []Flag
+	Args        []Arg
+	Run         func(ctx context.Context, in Input, out Output) error
+}
+
+// Flag describes a string flag passed to a command.
+type Flag struct {
+	Name        string
+	Shorthand   string
+	Description string
+	Default     string
+}
+
+// Arg describes a positional argument.
+type Arg struct {
+	Name        string
+	Description string
+	Required    bool
+}
+
+// Input is the parsed argument and flag view handed to Command.Run.
+type Input interface {
+	Args() []string
+	Argument(name string) (string, bool)
+	Flag(name string) (string, bool)
+}
+
+// Output is an injected writer used by commands instead of package-level stdout.
+type Output interface {
+	io.Writer
+	Println(a ...any)
+	Printf(format string, a ...any)
+}
+
+type cobraInput struct {
+	cmd  *cobra.Command
+	spec Command
+	args []string
+}
+
+func (in cobraInput) Args() []string { return in.args }
+
+func (in cobraInput) Argument(name string) (string, bool) {
+	for i, arg := range in.spec.Args {
+		if arg.Name == name {
+			if i < len(in.args) {
+				return in.args[i], true
+			}
+			return "", false
+		}
+	}
+	return "", false
+}
+
+func (in cobraInput) Flag(name string) (string, bool) {
+	if in.cmd == nil || in.cmd.Flags() == nil {
+		return "", false
+	}
+	if !in.cmd.Flags().Changed(name) {
+		val, err := in.cmd.Flags().GetString(name)
+		if err != nil || val == "" {
+			return "", false
+		}
+		return val, true
+	}
+	val, err := in.cmd.Flags().GetString(name)
+	if err != nil {
+		return "", false
+	}
+	return val, true
+}
+
+type writerOutput struct {
+	w io.Writer
+}
+
+func (o writerOutput) Write(p []byte) (int, error) {
+	if o.w == nil {
+		return 0, io.ErrClosedPipe
+	}
+	return o.w.Write(p)
+}
+
+func (o writerOutput) Println(a ...any) {
+	if o.w == nil {
+		return
+	}
+	fmt.Fprintln(o.w, a...)
+}
+
+func (o writerOutput) Printf(format string, a ...any) {
+	if o.w == nil {
+		return
+	}
+	fmt.Fprintf(o.w, format, a...)
+}

bonfire/root.go

@@ -0,0 +1,58 @@
+package bonfire
+
+import (
+	"io"
+	"os"
+
+	"github.com/spf13/cobra"
+)
+
+// NewRoot builds the shared cobra root used by the summer tool and app binaries.
+// It accepts command values rather than a party registry to avoid an import cycle.
+func NewRoot(name string, commands []Command, out io.Writer) *cobra.Command {
+	if out == nil {
+		out = os.Stdout
+	}
+	root := &cobra.Command{
+		Use:           name,
+		SilenceUsage:  true,
+		SilenceErrors: true,
+		CompletionOptions: cobra.CompletionOptions{
+			DisableDefaultCmd: true,
+		},
+	}
+	root.SetOut(out)
+	root.SetErr(out)
+	for _, command := range commands {
+		root.AddCommand(wrap(command, out))
+	}
+	return root
+}
+
+func wrap(c Command, out io.Writer) *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   c.Name,
+		Short: c.Description,
+		Args:  cobra.ArbitraryArgs,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			if c.Run == nil {
+				return nil
+			}
+			writer := out
+			if cmd != nil {
+				if w := cmd.OutOrStdout(); w != nil {
+					writer = w
+				}
+			}
+			return c.Run(cmd.Context(), cobraInput{cmd: cmd, spec: c, args: args}, writerOutput{w: writer})
+		},
+	}
+	for _, flag := range c.Flags {
+		if flag.Shorthand != "" {
+			cmd.Flags().StringP(flag.Name, flag.Shorthand, flag.Default, flag.Description)
+			continue
+		}
+		cmd.Flags().String(flag.Name, flag.Default, flag.Description)
+	}
+	return cmd
+}

compass/config.go

@@ -0,0 +1,72 @@
+package compass
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/knadh/koanf/parsers/yaml"
+	"github.com/knadh/koanf/v2"
+)
+
+// Config is a YAML configuration tree with dot-path access.
+type Config struct {
+	k *koanf.Koanf
+}
+
+// Load reads config/<section>.yaml files from dir. Each filename stem becomes
+// the top-level section, so config/app.yaml key name is app.name.
+func Load(dir string) (*Config, error) {
+	k := koanf.New(".")
+	entries, err := os.ReadDir(dir)
+	if err != nil {
+		return nil, fmt.Errorf("compass: read config dir %s: %w", dir, err)
+	}
+	parser := yaml.Parser()
+	for _, entry := range entries {
+		if entry.IsDir() {
+			continue
+		}
+		name := entry.Name()
+		section, ok := sectionName(name)
+		if !ok {
+			continue
+		}
+		path := filepath.Join(dir, name)
+		raw, err := os.ReadFile(path)
+		if err != nil {
+			return nil, fmt.Errorf("compass: read %s: %w", path, err)
+		}
+		parsed, err := parser.Unmarshal(raw)
+		if err != nil {
+			return nil, fmt.Errorf("compass: parse %s: %w", path, err)
+		}
+		if parsed == nil {
+			parsed = map[string]any{}
+		}
+		if err := k.Set(section, parsed); err != nil {
+			return nil, fmt.Errorf("compass: set section %s: %w", section, err)
+		}
+	}
+	return &Config{k: k}, nil
+}
+
+// String returns the string value at path, or "" if unset.
+func (c *Config) String(path string) string {
+	if c == nil || c.k == nil {
+		return ""
+	}
+	return c.k.String(path)
+}
+
+func sectionName(filename string) (string, bool) {
+	switch {
+	case strings.HasSuffix(filename, ".yaml"):
+		return strings.TrimSuffix(filename, ".yaml"), true
+	case strings.HasSuffix(filename, ".yml"):
+		return strings.TrimSuffix(filename, ".yml"), true
+	default:
+		return "", false
+	}
+}

compass/config_test.go

@@ -0,0 +1,23 @@
+package compass
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestLoadStringFromAppSection(t *testing.T) {
+	dir := t.TempDir()
+	path := filepath.Join(dir, "app.yaml")
+	if err := os.WriteFile(path, []byte("name: hello-app\n"), 0o644); err != nil {
+		t.Fatal(err)
+	}
+
+	cfg, err := Load(dir)
+	if err != nil {
+		t.Fatalf("Load: %v", err)
+	}
+	if got := cfg.String("app.name"); got != "hello-app" {
+		t.Fatalf("String(app.name) = %q, want hello-app", got)
+	}
+}

examples/hello/config/app.yaml

@@ -0,0 +1 @@
+name: hello-app

examples/hello/go.mod

@@ -0,0 +1,30 @@
+module git.golem15.com/golem15/summercms/examples/hello
+
+go 1.27.0
+
+toolchain go1.27.0
+
+require (
+	git.golem15.com/golem15/summercms v0.0.0
+	git.golem15.com/golem15/summercms/examples/hello/plugins/base v0.0.0
+	git.golem15.com/golem15/summercms/examples/hello/plugins/greeter v0.0.0
+)
+
+require (
+	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/knadh/koanf/maps v0.1.2 // indirect
+	github.com/knadh/koanf/parsers/yaml v1.1.1 // indirect
+	github.com/knadh/koanf/v2 v2.3.6 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/spf13/cobra v1.10.2 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+)
+
+replace (
+	git.golem15.com/golem15/summercms => ../..
+	git.golem15.com/golem15/summercms/examples/hello/plugins/base => ./plugins/base
+	git.golem15.com/golem15/summercms/examples/hello/plugins/greeter => ./plugins/greeter
+)

examples/hello/go.sum

@@ -0,0 +1,37 @@
+github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-viper/mapstructure/v2 v2.4.0 h1:EBsztssimR/CONLSZZ04E8qAkxNYq4Qp9LvH92wZUgs=
+github.com/go-viper/mapstructure/v2 v2.4.0/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/knadh/koanf/maps v0.1.2 h1:RBfmAW5CnZT+PJ1CVc1QSJKf4Xu9kxfQgYVQSu8hpbo=
+github.com/knadh/koanf/maps v0.1.2/go.mod h1:npD/QZY3V6ghQDdcQzl1W4ICNVTkohC8E73eI2xW4yI=
+github.com/knadh/koanf/parsers/yaml v1.1.1 h1:u70vV5IyaM0HvONh8HoqBC97oTgO33KcpZbTLiKVinU=
+github.com/knadh/koanf/parsers/yaml v1.1.1/go.mod h1:HHmcHXUrp9cOPcuC+2wrr44GTUB0EC+PyfN3HZD9tFg=
+github.com/knadh/koanf/v2 v2.3.6 h1:JoQPSJmvS4aP0xNc8xMDr5tcrkSEInL23/Il7pITAKo=
+github.com/knadh/koanf/v2 v2.3.6/go.mod h1:gRb40VRAbd4iJMYYD5IxZ6hfuopFcXBpc9bbQpZwo28=
+github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
+github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/mitchellh/copystructure v1.2.0 h1:vpKXTN4ewci03Vljg/q9QvCGUDttBOGBIa15WveJJGw=
+github.com/mitchellh/copystructure v1.2.0/go.mod h1:qLl+cE2AmVv+CoeAwDPye/v+N2HKCj9FbZEVFJRxO9s=
+github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zxSIeXaQ=
+github.com/mitchellh/reflectwalk v1.0.2/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.10.2 h1:DMTTonx5m65Ic0GOoRY2c16WCbHxOOw6xxezuLaBpcU=
+github.com/spf13/cobra v1.10.2/go.mod h1:7C1pvHqHw5A4vrJfjNwvOdzYu0Gml16OCs2GRiTUUS4=
+github.com/spf13/pflag v1.0.9 h1:9exaQaMOCwffKiiiYk6/BndUBv+iRViNW+4lEMi0PvY=
+github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
+go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

examples/hello/hello_test.go

@@ -0,0 +1,17 @@
+package main
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+)
+
+func TestGreeterHelloPrintsAppName(t *testing.T) {
+	var buf bytes.Buffer
+	if err := run([]string{"greeter:hello"}, &buf); err != nil {
+		t.Fatalf("greeter:hello: %v", err)
+	}
+	if got := strings.TrimSpace(buf.String()); got != "hello-app" {
+		t.Fatalf("output = %q, want %q", got, "hello-app")
+	}
+}

examples/hello/main.go

@@ -0,0 +1,43 @@
+// Code generated by summer build. DO NOT EDIT.
+
+package main
+
+import (
+	"fmt"
+	"io"
+	"os"
+
+	"git.golem15.com/golem15/summercms/backpack"
+	"git.golem15.com/golem15/summercms/bonfire"
+	"git.golem15.com/golem15/summercms/compass"
+	"git.golem15.com/golem15/summercms/pact"
+	"git.golem15.com/golem15/summercms/party"
+)
+
+func main() {
+	if err := run(os.Args[1:], os.Stdout); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+func run(args []string, out io.Writer) error {
+	cfg, err := compass.Load("config")
+	if err != nil {
+		return err
+	}
+	app := backpack.New(cfg)
+	plugins, err := party.Activate(app, PluginIDs)
+	if err != nil {
+		return err
+	}
+	var commands []bonfire.Command
+	for _, plugin := range plugins {
+		if hasCommands, ok := plugin.(pact.HasCommands); ok {
+			commands = append(commands, hasCommands.Commands()...)
+		}
+	}
+	root := bonfire.NewRoot("hello", commands, out)
+	root.SetArgs(args)
+	return root.Execute()
+}

examples/hello/plugins.gen.go

@@ -0,0 +1,14 @@
+// Code generated by summer build. DO NOT EDIT.
+
+package main
+
+import (
+	_ "git.golem15.com/golem15/summercms/examples/hello/plugins/base"
+	_ "git.golem15.com/golem15/summercms/examples/hello/plugins/greeter"
+)
+
+// PluginIDs is the ordered plugin list from summer.yaml.
+var PluginIDs = []string{
+	"golem15.hello",
+	"golem15.greeter",
+}

examples/hello/plugins/base/go.mod

@@ -0,0 +1,19 @@
+module git.golem15.com/golem15/summercms/examples/hello/plugins/base
+
+go 1.27.0
+
+toolchain go1.27.0
+
+require git.golem15.com/golem15/summercms v0.0.0
+
+require (
+	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
+	github.com/knadh/koanf/maps v0.1.2 // indirect
+	github.com/knadh/koanf/parsers/yaml v1.1.1 // indirect
+	github.com/knadh/koanf/v2 v2.3.6 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+)
+
+replace git.golem15.com/golem15/summercms => ../../../..

examples/hello/plugins/base/go.sum

@@ -0,0 +1,29 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
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+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/mitchellh/copystructure v1.2.0 h1:vpKXTN4ewci03Vljg/q9QvCGUDttBOGBIa15WveJJGw=
+github.com/mitchellh/copystructure v1.2.0/go.mod h1:qLl+cE2AmVv+CoeAwDPye/v+N2HKCj9FbZEVFJRxO9s=
+github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zxSIeXaQ=
+github.com/mitchellh/reflectwalk v1.0.2/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
+go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

examples/hello/plugins/base/plugin.go

@@ -0,0 +1,19 @@
+package base
+
+import (
+	"git.golem15.com/golem15/summercms/backpack"
+	"git.golem15.com/golem15/summercms/party"
+)
+
+// Plugin is the golem15.hello plugin.
+type Plugin struct{}
+
+func (p *Plugin) ID() string         { return "golem15.hello" }
+func (p *Plugin) Requires() []string { return nil }
+
+func (p *Plugin) Register(*backpack.App) error { return nil }
+func (p *Plugin) Boot(*backpack.App) error     { return nil }
+
+func init() {
+	party.Register(&Plugin{})
+}

examples/hello/plugins/greeter/go.mod

@@ -0,0 +1,22 @@
+module git.golem15.com/golem15/summercms/examples/hello/plugins/greeter
+
+go 1.27.0
+
+toolchain go1.27.0
+
+require git.golem15.com/golem15/summercms v0.0.0
+
+require (
+	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/knadh/koanf/maps v0.1.2 // indirect
+	github.com/knadh/koanf/parsers/yaml v1.1.1 // indirect
+	github.com/knadh/koanf/v2 v2.3.6 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/spf13/cobra v1.10.2 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+)
+
+replace git.golem15.com/golem15/summercms => ../../../..

examples/hello/plugins/greeter/go.sum

@@ -0,0 +1,37 @@
+github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-viper/mapstructure/v2 v2.4.0 h1:EBsztssimR/CONLSZZ04E8qAkxNYq4Qp9LvH92wZUgs=
+github.com/go-viper/mapstructure/v2 v2.4.0/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
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+github.com/knadh/koanf/v2 v2.3.6/go.mod h1:gRb40VRAbd4iJMYYD5IxZ6hfuopFcXBpc9bbQpZwo28=
+github.com/kr/pretty v0.2.1 h1:Fmg33tUaq4/8ym9TJN1x7sLJnHVwhP33CNkpYV/7rwI=
+github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/mitchellh/copystructure v1.2.0 h1:vpKXTN4ewci03Vljg/q9QvCGUDttBOGBIa15WveJJGw=
+github.com/mitchellh/copystructure v1.2.0/go.mod h1:qLl+cE2AmVv+CoeAwDPye/v+N2HKCj9FbZEVFJRxO9s=
+github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zxSIeXaQ=
+github.com/mitchellh/reflectwalk v1.0.2/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
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+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.10.2 h1:DMTTonx5m65Ic0GOoRY2c16WCbHxOOw6xxezuLaBpcU=
+github.com/spf13/cobra v1.10.2/go.mod h1:7C1pvHqHw5A4vrJfjNwvOdzYu0Gml16OCs2GRiTUUS4=
+github.com/spf13/pflag v1.0.9 h1:9exaQaMOCwffKiiiYk6/BndUBv+iRViNW+4lEMi0PvY=
+github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
+go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

examples/hello/plugins/greeter/plugin.go

@@ -0,0 +1,43 @@
+package greeter
+
+import (
+	"context"
+
+	"git.golem15.com/golem15/summercms/backpack"
+	"git.golem15.com/golem15/summercms/bonfire"
+	"git.golem15.com/golem15/summercms/party"
+)
+
+// Plugin is the golem15.greeter plugin. It requires golem15.hello.
+type Plugin struct {
+	app *backpack.App
+}
+
+func (p *Plugin) ID() string         { return "golem15.greeter" }
+func (p *Plugin) Requires() []string { return []string{"golem15.hello"} }
+
+func (p *Plugin) Register(*backpack.App) error { return nil }
+
+func (p *Plugin) Boot(app *backpack.App) error {
+	p.app = app
+	return nil
+}
+
+func (p *Plugin) Commands() []bonfire.Command {
+	return []bonfire.Command{{
+		Name:        "greeter:hello",
+		Description: "Print the configured application name",
+		Run: func(ctx context.Context, in bonfire.Input, out bonfire.Output) error {
+			name := ""
+			if p.app != nil && p.app.Config != nil {
+				name = p.app.Config.String("app.name")
+			}
+			out.Println(name)
+			return nil
+		},
+	}}
+}
+
+func init() {
+	party.Register(&Plugin{})
+}

examples/hello/summer.yaml

@@ -0,0 +1,7 @@
+module: git.golem15.com/golem15/summercms/examples/hello
+binary: hello
+plugins:
+  - id: golem15.hello
+    module: git.golem15.com/golem15/summercms/examples/hello/plugins/base
+  - id: golem15.greeter
+    module: git.golem15.com/golem15/summercms/examples/hello/plugins/greeter

go.mod

@@ -1,3 +1,21 @@
 module git.golem15.com/golem15/summercms
 
 go 1.27.0
+
+toolchain go1.27.0
+
+require (
+	github.com/knadh/koanf/parsers/yaml v1.1.1
+	github.com/knadh/koanf/v2 v2.3.6
+	github.com/spf13/cobra v1.10.2
+)
+
+require (
+	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/knadh/koanf/maps v0.1.2 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+	go.yaml.in/yaml/v3 v3.0.4 // indirect
+)

go.sum

@@ -0,0 +1,37 @@
+github.com/cpuguy83/go-md2man/v2 v2.0.6/go.mod h1:oOW0eioCTA6cOiMLiUPZOpcVxMig6NIQQ7OS05n1F4g=
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/go-viper/mapstructure/v2 v2.4.0 h1:EBsztssimR/CONLSZZ04E8qAkxNYq4Qp9LvH92wZUgs=
+github.com/go-viper/mapstructure/v2 v2.4.0/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
+github.com/inconshreveable/mousetrap v1.1.0 h1:wN+x4NVGpMsO7ErUn/mUI3vEoE6Jt13X2s0bqwp9tc8=
+github.com/inconshreveable/mousetrap v1.1.0/go.mod h1:vpF70FUmC8bwa3OWnCshd2FqLfsEA9PFc4w1p2J65bw=
+github.com/knadh/koanf/maps v0.1.2 h1:RBfmAW5CnZT+PJ1CVc1QSJKf4Xu9kxfQgYVQSu8hpbo=
+github.com/knadh/koanf/maps v0.1.2/go.mod h1:npD/QZY3V6ghQDdcQzl1W4ICNVTkohC8E73eI2xW4yI=
+github.com/knadh/koanf/parsers/yaml v1.1.1 h1:u70vV5IyaM0HvONh8HoqBC97oTgO33KcpZbTLiKVinU=
+github.com/knadh/koanf/parsers/yaml v1.1.1/go.mod h1:HHmcHXUrp9cOPcuC+2wrr44GTUB0EC+PyfN3HZD9tFg=
+github.com/knadh/koanf/v2 v2.3.6 h1:JoQPSJmvS4aP0xNc8xMDr5tcrkSEInL23/Il7pITAKo=
+github.com/knadh/koanf/v2 v2.3.6/go.mod h1:gRb40VRAbd4iJMYYD5IxZ6hfuopFcXBpc9bbQpZwo28=
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+github.com/kr/pretty v0.2.1/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI=
+github.com/kr/text v0.2.0 h1:5Nx0Ya0ZqY2ygV366QzturHI13Jq95ApcVaJBhpS+AY=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
+github.com/mitchellh/copystructure v1.2.0 h1:vpKXTN4ewci03Vljg/q9QvCGUDttBOGBIa15WveJJGw=
+github.com/mitchellh/copystructure v1.2.0/go.mod h1:qLl+cE2AmVv+CoeAwDPye/v+N2HKCj9FbZEVFJRxO9s=
+github.com/mitchellh/reflectwalk v1.0.2 h1:G2LzWKi524PWgd3mLHV8Y5k7s6XUvT0Gef6zxSIeXaQ=
+github.com/mitchellh/reflectwalk v1.0.2/go.mod h1:mSTlrgnPZtwu0c4WaC2kGObEpuNDbx0jmZXqmk4esnw=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
+github.com/spf13/cobra v1.10.2 h1:DMTTonx5m65Ic0GOoRY2c16WCbHxOOw6xxezuLaBpcU=
+github.com/spf13/cobra v1.10.2/go.mod h1:7C1pvHqHw5A4vrJfjNwvOdzYu0Gml16OCs2GRiTUUS4=
+github.com/spf13/pflag v1.0.9 h1:9exaQaMOCwffKiiiYk6/BndUBv+iRViNW+4lEMi0PvY=
+github.com/spf13/pflag v1.0.9/go.mod h1:McXfInJRrz4CZXVZOBLb0bTZqETkiAhM9Iw0y3An2Bg=
+github.com/stretchr/testify v1.8.4 h1:CcVxjf3Q8PM0mHUKJCdn+eZZtm5yQwehR5yeSVQQcUk=
+github.com/stretchr/testify v1.8.4/go.mod h1:sz/lmYIOXD/1dqDmKjjqLyZ2RngseejIcXlSw2iwfAo=
+go.yaml.in/yaml/v3 v3.0.4 h1:tfq32ie2Jv2UxXFdLJdh3jXuOzWiL1fo0bu/FbuKpbc=
+go.yaml.in/yaml/v3 v3.0.4/go.mod h1:DhzuOOF2ATzADvBadXxruRBLzYTpT36CKvDb3+aBEFg=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15 h1:YR8cESwS4TdDjEe65xsg0ogRM/Nc3DYOhEAlW+xobZo=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

go.work

@@ -0,0 +1,10 @@
+go 1.27.0
+
+toolchain go1.27.0
+
+use (
+	.
+	./examples/hello
+	./examples/hello/plugins/base
+	./examples/hello/plugins/greeter
+)

pact/capabilities.go

@@ -0,0 +1,34 @@
+package pact
+
+import (
+	"io/fs"
+
+	"git.golem15.com/golem15/summercms/bonfire"
+)
+
+// HasCommands is implemented by plugins that register console commands.
+type HasCommands interface {
+	Commands() []bonfire.Command
+}
+
+// HasConfig is implemented by plugins that ship default YAML configuration.
+// ConfigFS should contain files such as config/config.yaml, merged later at
+// the plugin ID path.
+type HasConfig interface {
+	ConfigFS() fs.FS
+}
+
+// Reserved KERN-03 capability names, declared when their first consumers exist:
+//
+//	HasModels
+//	HasMigrations
+//	HasRoutes
+//	HasMiddleware
+//	HasJobs
+//	HasListeners
+//	HasAdminControllers
+//	HasNavigation
+//	HasPermissions
+//	HasSchedule
+//	HasMailTemplates
+//	HasLang

party/registry.go

@@ -0,0 +1,195 @@
+package party
+
+import (
+	"fmt"
+	"strings"
+	"sync"
+
+	"git.golem15.com/golem15/summercms/backpack"
+)
+
+// Plugin is the required descriptor every compiled plugin implements.
+type Plugin interface {
+	ID() string
+	Requires() []string
+	Register(app *backpack.App) error
+	Boot(app *backpack.App) error
+}
+
+var (
+	mu      sync.Mutex
+	plugins []Plugin
+)
+
+// Register appends a plugin to the process-wide registry. Plugins call this
+// from init() after a blank import; Activate selects and orders them.
+func Register(p Plugin) {
+	if p == nil {
+		return
+	}
+	mu.Lock()
+	defer mu.Unlock()
+	plugins = append(plugins, p)
+}
+
+func snapshot() []Plugin {
+	mu.Lock()
+	defer mu.Unlock()
+	out := make([]Plugin, len(plugins))
+	copy(out, plugins)
+	return out
+}
+
+// Activate resolves ids in manifest order, topologically sorts Requires(),
+// then runs every Register before any Boot.
+func Activate(app *backpack.App, ids []string) ([]Plugin, error) {
+	if app == nil {
+		return nil, fmt.Errorf("party: app is nil")
+	}
+	return activate(snapshot(), app, ids)
+}
+
+func activate(registered []Plugin, app *backpack.App, ids []string) ([]Plugin, error) {
+	byID := make(map[string]Plugin, len(registered))
+	for _, p := range registered {
+		if p == nil {
+			continue
+		}
+		id := p.ID()
+		if id == "" {
+			return nil, fmt.Errorf("party: registered plugin has empty id")
+		}
+		if _, exists := byID[id]; exists {
+			return nil, fmt.Errorf("party: duplicate plugin id %q", id)
+		}
+		byID[id] = p
+	}
+
+	seen := make(map[string]struct{}, len(ids))
+	selected := make([]Plugin, 0, len(ids))
+	index := make(map[string]int, len(ids))
+	for _, id := range ids {
+		if id == "" {
+			return nil, fmt.Errorf("party: empty plugin id in manifest")
+		}
+		if _, dup := seen[id]; dup {
+			return nil, fmt.Errorf("party: duplicate plugin id %q", id)
+		}
+		seen[id] = struct{}{}
+		p, ok := byID[id]
+		if !ok {
+			return nil, fmt.Errorf("party: plugin %q is not registered", id)
+		}
+		index[id] = len(selected)
+		selected = append(selected, p)
+	}
+
+	for _, p := range selected {
+		for _, req := range p.Requires() {
+			if _, ok := seen[req]; !ok {
+				return nil, fmt.Errorf("party: plugin %q requires %q, which is not registered", p.ID(), req)
+			}
+		}
+	}
+
+	ordered, err := topoSort(selected, index)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, p := range ordered {
+		if err := p.Register(app); err != nil {
+			return nil, fmt.Errorf("party: register %s: %w", p.ID(), err)
+		}
+	}
+	for _, p := range ordered {
+		if err := p.Boot(app); err != nil {
+			return nil, fmt.Errorf("party: boot %s: %w", p.ID(), err)
+		}
+	}
+	return ordered, nil
+}
+
+func topoSort(plugins []Plugin, index map[string]int) ([]Plugin, error) {
+	byID := make(map[string]Plugin, len(plugins))
+	indeg := make(map[string]int, len(plugins))
+	dependents := make(map[string][]string, len(plugins))
+	for _, p := range plugins {
+		byID[p.ID()] = p
+		indeg[p.ID()] = 0
+	}
+	for _, p := range plugins {
+		seenReq := make(map[string]struct{})
+		for _, req := range p.Requires() {
+			if _, ok := seenReq[req]; ok {
+				continue
+			}
+			seenReq[req] = struct{}{}
+			if _, ok := byID[req]; !ok {
+				continue
+			}
+			indeg[p.ID()]++
+			dependents[req] = append(dependents[req], p.ID())
+		}
+	}
+
+	ready := make([]string, 0, len(plugins))
+	for _, p := range plugins {
+		if indeg[p.ID()] == 0 {
+			ready = append(ready, p.ID())
+		}
+	}
+
+	out := make([]Plugin, 0, len(plugins))
+	for len(ready) > 0 {
+		id := ready[0]
+		ready = ready[1:]
+		out = append(out, byID[id])
+		next := append([]string(nil), dependents[id]...)
+		sortByIndex(next, index)
+		for _, dep := range next {
+			indeg[dep]--
+			if indeg[dep] == 0 {
+				ready = insertByIndex(ready, dep, index)
+			}
+		}
+	}
+	if len(out) != len(plugins) {
+		leftover := make([]string, 0)
+		done := make(map[string]struct{}, len(out))
+		for _, p := range out {
+			done[p.ID()] = struct{}{}
+		}
+		for _, p := range plugins {
+			if _, ok := done[p.ID()]; !ok {
+				leftover = append(leftover, p.ID())
+			}
+		}
+		return nil, fmt.Errorf("party: dependency cycle involving %s", strings.Join(leftover, ", "))
+	}
+	return out, nil
+}
+
+func sortByIndex(ids []string, index map[string]int) {
+	for i := 1; i < len(ids); i++ {
+		j := i
+		for j > 0 && index[ids[j]] < index[ids[j-1]] {
+			ids[j], ids[j-1] = ids[j-1], ids[j]
+			j--
+		}
+	}
+}
+
+func insertByIndex(ready []string, id string, index map[string]int) []string {
+	at := len(ready)
+	for i, existing := range ready {
+		if index[id] < index[existing] {
+			at = i
+			break
+		}
+	}
+	ready = append(ready, "")
+	copy(ready[at+1:], ready[at:])
+	ready[at] = id
+	return ready
+}

party/registry_test.go

@@ -0,0 +1,56 @@
+package party
+
+import (
+	"strings"
+	"testing"
+
+	"git.golem15.com/golem15/summercms/backpack"
+	"git.golem15.com/golem15/summercms/compass"
+)
+
+type tracePlugin struct {
+	id  string
+	req []string
+	log *[]string
+}
+
+func (p *tracePlugin) ID() string         { return p.id }
+func (p *tracePlugin) Requires() []string { return p.req }
+
+func (p *tracePlugin) Register(*backpack.App) error {
+	*p.log = append(*p.log, p.id+":register")
+	return nil
+}
+
+func (p *tracePlugin) Boot(*backpack.App) error {
+	*p.log = append(*p.log, p.id+":boot")
+	return nil
+}
+
+func TestActivateRunsAllRegisterBeforeAnyBoot(t *testing.T) {
+	var log []string
+	hello := &tracePlugin{id: "golem15.hello", log: &log}
+	greeter := &tracePlugin{id: "golem15.greeter", req: []string{"golem15.hello"}, log: &log}
+	app := backpack.New(&compass.Config{})
+
+	got, err := activate([]Plugin{greeter, hello}, app, []string{"golem15.greeter", "golem15.hello"})
+	if err != nil {
+		t.Fatalf("activate: %v", err)
+	}
+	if len(got) != 2 {
+		t.Fatalf("got %d plugins, want 2", len(got))
+	}
+	if got[0].ID() != "golem15.hello" || got[1].ID() != "golem15.greeter" {
+		t.Fatalf("order = %s, %s", got[0].ID(), got[1].ID())
+	}
+
+	want := []string{
+		"golem15.hello:register",
+		"golem15.greeter:register",
+		"golem15.hello:boot",
+		"golem15.greeter:boot",
+	}
+	if strings.Join(log, ",") != strings.Join(want, ",") {
+		t.Fatalf("lifecycle = %v, want %v", log, want)
+	}
+}