refactor: switch config format from YAML to TOML

- Replace gopkg.in/yaml.v3 with github.com/BurntSushi/toml
- Update struct tags from yaml to toml
- Update config tests to use TOML syntax
- Add testdata/config.toml, update Helm configmap template

config.toml

@@ -0,0 +1,24 @@
+[server]
+addr = ":8080"
+
+[git]
+type = "gitea"
+base_url = "https://git.example.com"
+token = "test-token"
+
+[cluster]
+kubeconfig = "/dev/null"
+namespace = "proto-gen"
+job_timeout = 600
+max_concurrent = 2
+
+toolchain_registry = "registry.example.com/proto-gen"
+target_repo_template = "{proto_repo}-gen-{lang}"
+
+[[plugins]]
+language = "go"
+image = "proto-gen-go:v1.34.2"
+
+[[plugins]]
+language = "nodejs"
+image = "proto-gen-ts:v0.9.0"

deploy/helm/proto-gen/templates/configmap.yaml

@@ -3,22 +3,26 @@ kind: ConfigMap
 metadata:
   name: {{ .Release.Name }}-config
 data:
-  config.yaml: |
+  config.toml: |
-    server:
+    [server]
-      addr: ":8080"
+    addr = ":8080"
-    git:
+
-      type: gitea
+    [git]
-      base_url: "{{ .Values.git.baseUrl }}"
+    type = "gitea"
-      token: "${GIT_TOKEN}"
+    base_url = "{{ .Values.git.baseUrl }}"
-    cluster:
+    token = "${GIT_TOKEN}"
-      kubeconfig: /etc/proto-gen/kubeconfig
+
-      namespace: {{ .Values.cluster.namespace }}
+    [cluster]
-      job_timeout: {{ .Values.cluster.jobTimeout }}
+    kubeconfig = "/etc/proto-gen/kubeconfig"
-      max_concurrent: {{ .Values.cluster.maxConcurrent }}
+    namespace = "{{ .Values.cluster.namespace }}"
-    toolchain_registry: "{{ .Values.toolchainRegistry }}"
+    job_timeout = {{ .Values.cluster.jobTimeout }}
-    target_repo_template: "{{ .Values.targetRepoTemplate }}"
+    max_concurrent = {{ .Values.cluster.maxConcurrent }}
-    plugins:
+
-      {{- range .Values.plugins }}
+    toolchain_registry = "{{ .Values.toolchainRegistry }}"
-      - language: {{ .language }}
+    target_repo_template = "{{ .Values.targetRepoTemplate }}"
-        image: "{{ .image }}"
+
-      {{- end }}
+    {{- range .Values.plugins }}
+    [[plugins]]
+    language = "{{ .language }}"
+    image = "{{ .image }}"
+    {{- end }}

go.mod

@@ -3,9 +3,9 @@ module proto-gen
 go 1.26.5
 
 require (
+	github.com/BurntSushi/toml v1.6.0
 	github.com/go-chi/chi/v5 v5.3.1
 	github.com/google/uuid v1.6.0
-	gopkg.in/yaml.v3 v3.0.1
 	k8s.io/api v0.36.3
 	k8s.io/apimachinery v0.36.3
 	k8s.io/client-go v0.36.3
@@ -44,6 +44,7 @@ require (
 	google.golang.org/protobuf v1.36.12-0.20260120151049-f2248ac996af // indirect
 	gopkg.in/evanphx/json-patch.v4 v4.13.0 // indirect
 	gopkg.in/inf.v0 v0.9.1 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/klog/v2 v2.140.0 // indirect
 	k8s.io/kube-openapi v0.0.0-20260317180543-43fb72c5454a // indirect
 	k8s.io/utils v0.0.0-20260210185600-b8788abfbbc2 // indirect

go.sum

@@ -1,3 +1,5 @@
+github.com/BurntSushi/toml v1.6.0 h1:dRaEfpa2VI55EwlIW72hMRHdWouJeRF7TPYhI+AUQjk=
+github.com/BurntSushi/toml v1.6.0/go.mod h1:ukJfTF/6rtPPRCnwkur4qwRxa8vTRFBF0uk2lLoLwho=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=

internal/config/config.go

@@ -6,39 +6,39 @@ import (
 	"regexp"
 	"strings"
 
-	"gopkg.in/yaml.v3"
+	"github.com/BurntSushi/toml"
 )
 
 type Config struct {
-	Server ServerConfig `yaml:"server"`
+	Server             ServerConfig   `toml:"server"`
-	Git    GitConfig    `yaml:"git"`
+	Git                GitConfig      `toml:"git"`
-	Cluster ClusterConfig `yaml:"cluster"`
+	Cluster            ClusterConfig  `toml:"cluster"`
-	ToolchainRegistry string `yaml:"toolchain_registry"`
+	ToolchainRegistry  string         `toml:"toolchain_registry"`
-	TargetRepoTemplate string `yaml:"target_repo_template"`
+	TargetRepoTemplate string         `toml:"target_repo_template"`
-	Plugins []PluginConfig `yaml:"plugins"`
+	Plugins            []PluginConfig `toml:"plugins"`
 }
 
 type ServerConfig struct {
-	Addr      string `yaml:"addr"`
+	Addr      string `toml:"addr"`
-	PublicURL string `yaml:"public_url"`
+	PublicURL string `toml:"public_url"`
 }
 
 type GitConfig struct {
-	Type    string `yaml:"type"`
+	Type    string `toml:"type"`
-	BaseURL string `yaml:"base_url"`
+	BaseURL string `toml:"base_url"`
-	Token   string `yaml:"token"`
+	Token   string `toml:"token"`
 }
 
 type ClusterConfig struct {
-	Kubeconfig     string `yaml:"kubeconfig"`
+	Kubeconfig    string `toml:"kubeconfig"`
-	Namespace      string `yaml:"namespace"`
+	Namespace     string `toml:"namespace"`
-	JobTimeout     int    `yaml:"job_timeout"`
+	JobTimeout    int    `toml:"job_timeout"`
-	MaxConcurrent  int    `yaml:"max_concurrent"`
+	MaxConcurrent int    `toml:"max_concurrent"`
 }
 
 type PluginConfig struct {
-	Language string `yaml:"language"`
+	Language string `toml:"language"`
-	Image    string `yaml:"image"`
+	Image    string `toml:"image"`
 }
 
 var envVarRegex = regexp.MustCompile(`\$\{(\w+)\}`)
@@ -52,7 +52,7 @@ func Load(path string) (*Config, error) {
 	expanded := expandEnvVars(string(data))
 
 	var cfg Config
-	if err := yaml.Unmarshal([]byte(expanded), &cfg); err != nil {
+	if _, err := toml.Decode(expanded, &cfg); err != nil {
 		return nil, fmt.Errorf("parsing config: %w", err)
 	}
 

internal/config/config_test.go

@@ -7,20 +7,22 @@ import (
 )
 
 func TestLoad_MissingFile(t *testing.T) {
-	_, err := Load("/nonexistent/config.yaml")
+	_, err := Load("/nonexistent/config.toml")
 	if err == nil {
 		t.Fatal("expected error for missing file")
 	}
 }
 
 func TestLoad_MissingGitToken(t *testing.T) {
-	cfg := `server:
+	cfg := `[server]
-  addr: ":8080"
+addr = ":8080"
-git:
+
-  type: gitea
+[git]
-  base_url: "https://git.example.com"
+type = "gitea"
-cluster:
+base_url = "https://git.example.com"
-  namespace: proto-gen`
+
+[cluster]
+namespace = "proto-gen"`
 	path := writeTempConfig(t, cfg)
 	os.Setenv("GIT_TOKEN", "")
 	_, err := Load(path)
@@ -33,19 +35,22 @@ func TestLoad_ValidConfig(t *testing.T) {
 	os.Setenv("GIT_TOKEN", "test-token")
 	defer os.Unsetenv("GIT_TOKEN")
 
-	cfg := `server:
+	cfg := `[server]
-  addr: ":9090"
+addr = ":9090"
-git:
+
-  type: gitea
+[git]
-  base_url: "https://git.example.com"
+type = "gitea"
-  token: ${GIT_TOKEN}
+base_url = "https://git.example.com"
-cluster:
+token = "${GIT_TOKEN}"
-  namespace: proto-gen
+
-  job_timeout: 300
+[cluster]
-  max_concurrent: 3
+namespace = "proto-gen"
-plugins:
+job_timeout = 300
-  - language: go
+max_concurrent = 3
-    image: "proto-gen-go:v1.0"`
+
+[[plugins]]
+language = "go"
+image = "proto-gen-go:v1.0"`
 	path := writeTempConfig(t, cfg)
 
 	got, err := Load(path)
@@ -73,12 +78,13 @@ func TestLoad_DefaultValues(t *testing.T) {
 	os.Setenv("GIT_TOKEN", "test-token")
 	defer os.Unsetenv("GIT_TOKEN")
 
-	cfg := `git:
+	cfg := `[git]
-  type: gitea
+type = "gitea"
-  base_url: "https://git.example.com"
+base_url = "https://git.example.com"
-  token: ${GIT_TOKEN}
+token = "${GIT_TOKEN}"
-cluster:
+
-  namespace: proto-gen`
+[cluster]
+namespace = "proto-gen"`
 	path := writeTempConfig(t, cfg)
 
 	got, err := Load(path)
@@ -119,7 +125,7 @@ func TestGetPluginByLanguage(t *testing.T) {
 func writeTempConfig(t *testing.T, content string) string {
 	t.Helper()
 	dir := t.TempDir()
-	path := filepath.Join(dir, "config.yaml")
+	path := filepath.Join(dir, "config.toml")
 	if err := os.WriteFile(path, []byte(content), 0644); err != nil {
 		t.Fatalf("writing temp config: %v", err)
 	}

testdata/config.toml

@@ -0,0 +1,25 @@
+[server]
+addr = ":8080"
+public_url = "https://gen.example.com"
+
+[git]
+type = "gitea"
+base_url = "https://git.example.com"
+token = "${GIT_TOKEN}"
+
+[cluster]
+kubeconfig = "/etc/proto-gen/kubeconfig"
+namespace = "proto-gen"
+job_timeout = 600
+max_concurrent = 2
+
+toolchain_registry = "registry.example.com/proto-gen"
+target_repo_template = "{proto_repo}-gen-{lang}"
+
+[[plugins]]
+language = "go"
+image = "proto-gen-go:v1.34.2"
+
+[[plugins]]
+language = "nodejs"
+image = "proto-gen-ts:v0.9.0"