Switch config format from YAML to TOML

Replaces gopkg.in/yaml.v3 with github.com/BurntSushi/toml. Updates
struct tags, default config path, Dockerfile CMD, README, and ships
config.example.toml in place of the YAML example. ${ENV_VAR}
expansion still runs on the raw file before parsing, so the behavior
is unchanged.

Dockerfile

@@ -18,4 +18,4 @@ COPY --from=build /out/bellhop /usr/local/bin/bellhop
 USER bellhop
 VOLUME ["/app/data"]
 ENTRYPOINT ["/usr/local/bin/bellhop"]
-CMD ["-config", "/app/config.yaml"]
+CMD ["-config", "/app/config.toml"]

README.md

@@ -19,7 +19,7 @@ Any member of an allowlisted room may issue commands. The bot auto-joins on invi
 
 ## Configuration
 
-Copy `config.example.yaml` to `config.yaml` and edit. The loader expands `${ENV_VAR}` references at load time, so secrets can come from the environment.
+Copy `config.example.toml` to `config.toml` and edit. The loader expands `${ENV_VAR}` references at load time, so secrets can come from the environment.
 
 Required:
 
@@ -43,7 +43,7 @@ curl -H "X-Api-Key: YOUR_KEY" https://radarr.example.com/api/v3/qualityprofile
 
 ```bash
 go build -tags goolm -o bellhop ./
-./bellhop -config config.yaml
+./bellhop -config config.toml
 ```
 
 The `goolm` tag uses the pure-Go olm implementation so libolm isn't needed.
@@ -54,7 +54,7 @@ The `goolm` tag uses the pure-Go olm implementation so libolm isn't needed.
 docker build -t bellhop .
 docker run -d \
   --name bellhop \
-  -v "$PWD/config.yaml:/app/config.yaml:ro" \
+  -v "$PWD/config.toml:/app/config.toml:ro" \
   -v bellhop-data:/app/data \
   bellhop
 ```
@@ -70,7 +70,7 @@ The bot bootstraps cross-signing on first run and persists Olm/Megolm sessions i
 ```
 main.go
 internal/
-  config/   — YAML loader with ${ENV_VAR} expansion
+  config/   — TOML loader with ${ENV_VAR} expansion
   matrix/   — mautrix client: login, device persistence, E2EE, sync loop
   arr/      — Radarr/Sonarr/Lidarr HTTP clients
   bot/      — command parser + dispatch + threaded replies

config.example.toml

@@ -0,0 +1,43 @@
+# Bellhop config. Values like ${ENV_VAR} are expanded from the environment
+# at load time so secrets can stay out of this file.
+
+[matrix]
+homeserver = "https://matrix.example.com"
+user_id = "@bellhop:example.com"
+password = "${BELLHOP_MATRIX_PASSWORD}"
+
+# Optional. Defaults shown.
+display_name = "Bellhop"
+data_dir = "./data"                  # device.json + crypto.db live here
+pickle_key = "${BELLHOP_PICKLE_KEY}" # encrypts the crypto store; pick something stable
+command_prefix = "!"
+
+# Rooms the bot will respond to commands in. Messages anywhere else are
+# ignored. The bot auto-joins on invite, but joining alone does not grant
+# command access — the room ID must appear here.
+allowed_rooms = [
+  "!room-id-one:example.com",
+  "!room-id-two:example.com",
+]
+
+# Configure any subset. Omit a section to disable that command:
+# leaving out [services.radarr] makes `!movie` reply "Radarr is not configured".
+
+[services.radarr]
+url = "https://radarr.example.com"
+api_key = "${RADARR_API_KEY}"
+quality_profile_id = 1
+root_folder = "/movies"
+
+[services.sonarr]
+url = "https://sonarr.example.com"
+api_key = "${SONARR_API_KEY}"
+quality_profile_id = 1
+root_folder = "/tv"
+
+[services.lidarr]
+url = "https://lidarr.example.com"
+api_key = "${LIDARR_API_KEY}"
+quality_profile_id = 1
+metadata_profile_id = 1   # required for Lidarr only
+root_folder = "/music"

config.example.yaml

@@ -1,42 +0,0 @@
-# Bellhop config. Values like ${ENV_VAR} are expanded from the environment
-# at load time so secrets can stay out of this file.
-
-matrix:
-  homeserver: https://matrix.example.com
-  user_id: "@bellhop:example.com"
-  password: ${BELLHOP_MATRIX_PASSWORD}
-
-  # Optional. Defaults shown.
-  display_name: Bellhop
-  data_dir: ./data            # device.json + crypto.db live here
-  pickle_key: ${BELLHOP_PICKLE_KEY}  # encrypts the crypto store; pick something stable
-  command_prefix: "!"
-
-  # Rooms the bot will respond to commands in. Messages anywhere else are
-  # ignored. The bot auto-joins on invite, but joining alone does not grant
-  # command access — the room ID must appear here.
-  allowed_rooms:
-    - "!room-id-one:example.com"
-    - "!room-id-two:example.com"
-
-# Configure any subset. Omit a block to disable that command:
-# leaving out `radarr` makes `!movie` reply "Radarr is not configured".
-services:
-  radarr:
-    url: https://radarr.example.com
-    api_key: ${RADARR_API_KEY}
-    quality_profile_id: 1
-    root_folder: /movies
-
-  sonarr:
-    url: https://sonarr.example.com
-    api_key: ${SONARR_API_KEY}
-    quality_profile_id: 1
-    root_folder: /tv
-
-  lidarr:
-    url: https://lidarr.example.com
-    api_key: ${LIDARR_API_KEY}
-    quality_profile_id: 1
-    metadata_profile_id: 1   # required for Lidarr only
-    root_folder: /music

go.mod

@@ -3,7 +3,7 @@ module bellhop
 go 1.25.0
 
 require (
-	gopkg.in/yaml.v3 v3.0.1
+	github.com/BurntSushi/toml v1.6.0
 	maunium.net/go/mautrix v0.28.0
 )
 

go.sum

@@ -1,5 +1,7 @@
 filippo.io/edwards25519 v1.2.0 h1:crnVqOiS4jqYleHd9vaKZ+HKtHfllngJIiOpNpoJsjo=
 filippo.io/edwards25519 v1.2.0/go.mod h1:xzAOLCNug/yB62zG1bQ8uziwrIqIuxhctzJT18Q77mc=
+github.com/BurntSushi/toml v1.6.0 h1:dRaEfpa2VI55EwlIW72hMRHdWouJeRF7TPYhI+AUQjk=
+github.com/BurntSushi/toml v1.6.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
 github.com/DATA-DOG/go-sqlmock v1.5.2 h1:OcvFkGmslmlZibjAjaHm3L//6LiuBgolP7OputlJIzU=
 github.com/DATA-DOG/go-sqlmock v1.5.2/go.mod h1:88MAG/4G7SMwSE3CeA0ZKzrT5CiOU3OJ+JlNzwDqpNU=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -41,8 +43,6 @@ golang.org/x/sys v0.44.0 h1:ildZl3J4uzeKP07r2F++Op7E9B29JRUy+a27EibtBTQ=
 golang.org/x/sys v0.44.0/go.mod h1:4GL1E5IUh+htKOUEOaiffhrAeqysfVGipDYzABqnCmw=
 golang.org/x/text v0.37.0 h1:Cqjiwd9eSg8e0QAkyCaQTNHFIIzWtidPahFWR83rTrc=
 golang.org/x/text v0.37.0/go.mod h1:a5sjxXGs9hsn/AJVwuElvCAo9v8QYLzvavO5z2PiM38=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
-gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/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=
 maunium.net/go/mautrix v0.28.0 h1:vBakLzf8MAdfED3NzAKiMeKQbc3AQ4EAS03NC+TVMXQ=

internal/config/config.go

@@ -6,42 +6,42 @@ import (
 	"os"
 	"regexp"
 
-	"gopkg.in/yaml.v3"
+	"github.com/BurntSushi/toml"
 )
 
 var envBracketRe = regexp.MustCompile(`\$\{([^}]+)\}`)
 
 type Config struct {
-	Matrix   MatrixConfig   `yaml:"matrix"`
+	Matrix   MatrixConfig   `toml:"matrix"`
-	Services ServicesConfig `yaml:"services"`
+	Services ServicesConfig `toml:"services"`
 }
 
 type MatrixConfig struct {
-	Homeserver  string   `yaml:"homeserver"`
+	Homeserver    string `toml:"homeserver"`
-	UserID      string   `yaml:"user_id"`
+	UserID        string `toml:"user_id"`
-	Password    string   `yaml:"password"`
+	Password      string `toml:"password"`
-	PickleKey   string   `yaml:"pickle_key"`
+	PickleKey     string `toml:"pickle_key"`
-	DisplayName string   `yaml:"display_name"`
+	DisplayName   string `toml:"display_name"`
-	DataDir     string   `yaml:"data_dir"`
+	DataDir       string `toml:"data_dir"`
-	CommandPrefix string `yaml:"command_prefix"`
+	CommandPrefix string `toml:"command_prefix"`
 	// AllowedRooms is the set of room IDs the bot listens for commands in.
 	// Messages in any other room are ignored.
-	AllowedRooms []string `yaml:"allowed_rooms"`
+	AllowedRooms []string `toml:"allowed_rooms"`
 }
 
 type ServicesConfig struct {
-	Radarr *ArrConfig `yaml:"radarr"`
+	Radarr *ArrConfig `toml:"radarr"`
-	Sonarr *ArrConfig `yaml:"sonarr"`
+	Sonarr *ArrConfig `toml:"sonarr"`
-	Lidarr *ArrConfig `yaml:"lidarr"`
+	Lidarr *ArrConfig `toml:"lidarr"`
 }
 
 type ArrConfig struct {
-	URL              string `yaml:"url"`
+	URL              string `toml:"url"`
-	APIKey           string `yaml:"api_key"`
+	APIKey           string `toml:"api_key"`
-	QualityProfileID int    `yaml:"quality_profile_id"`
+	QualityProfileID int    `toml:"quality_profile_id"`
-	RootFolder       string `yaml:"root_folder"`
+	RootFolder       string `toml:"root_folder"`
 	// MetadataProfileID is required by Lidarr; ignored by Radarr/Sonarr.
-	MetadataProfileID int `yaml:"metadata_profile_id"`
+	MetadataProfileID int `toml:"metadata_profile_id"`
 }
 
 func Load(path string) (*Config, error) {
@@ -60,7 +60,7 @@ func Load(path string) (*Config, error) {
 	})
 
 	var cfg Config
-	if err := yaml.Unmarshal([]byte(expanded), &cfg); err != nil {
+	if _, err := toml.Decode(expanded, &cfg); err != nil {
 		return nil, fmt.Errorf("parse config: %w", err)
 	}
 

main.go

@@ -15,7 +15,7 @@ import (
 )
 
 func main() {
-	configPath := flag.String("config", "config.yaml", "path to config file")
+	configPath := flag.String("config", "config.toml", "path to config file")
 	flag.Parse()
 
 	slog.SetDefault(slog.New(slog.NewTextHandler(os.Stderr, &slog.HandlerOptions{Level: slog.LevelInfo})))