Shrink binary by replacing Helm engine dependency

.goreleaser.yaml

@@ -1,6 +1,8 @@
 builds:
   - env:
       - CGO_ENABLED=0
+    flags:
+      - -trimpath
     goos:
       - linux
       - windows

format.go

@@ -7,9 +7,7 @@ import (
 	"strings"
 	"text/template"
 
-	_ "unsafe"
-
-	_ "helm.sh/helm/v3/pkg/engine" // Import to work with Helm's private functions (via go linkname)
+	"github.com/Masterminds/sprig/v3"
 )
 
 // Типы токенов для ясности, что мы нашли
@@ -42,8 +40,37 @@ var (
 	firstWordRe = regexp.MustCompile(`^\s*(\w+)`)
 )
 
-//go:linkname helmFuncMap helm.sh/helm/v3/pkg/engine.funcMap
-func helmFuncMap() template.FuncMap
+// helmFuncMap mirrors the function set registered by Helm's template engine
+// (helm.sh/helm/v3/pkg/engine.funcMap): Sprig's text function map, minus the
+// env/expandenv functions Helm removes, plus Helm's own additions. Only the
+// presence of each name matters for parse-time syntax validation, so the
+// non-Sprig additions are no-op placeholders that are never executed.
+func helmFuncMap() template.FuncMap {
+	f := sprig.TxtFuncMap()
+	delete(f, "env")
+	delete(f, "expandenv")
+
+	extra := template.FuncMap{
+		"toToml":        func(interface{}) string { return "" },
+		"fromToml":      func(string) map[string]interface{} { return nil },
+		"toYaml":        func(interface{}) string { return "" },
+		"toYamlPretty":  func(interface{}) string { return "" },
+		"fromYaml":      func(string) map[string]interface{} { return nil },
+		"fromYamlArray": func(string) []interface{} { return nil },
+		"toJson":        func(interface{}) string { return "" },
+		"fromJson":      func(string) map[string]interface{} { return nil },
+		"fromJsonArray": func(string) []interface{} { return nil },
+		"include":       func(string, interface{}) string { return "" },
+		"tpl":           func(string, interface{}) interface{} { return nil },
+		"required":      func(string, interface{}) (interface{}, error) { return nil, nil },
+		"lookup":        func(string, string, string, string) (map[string]interface{}, error) { return nil, nil },
+	}
+	for k, v := range extra {
+		f[k] = v
+	}
+
+	return f
+}
 
 // validateTemplateSyntax validates the given template source string using
 // Helm function set. Returns an error if the template has invalid syntax.

go.mod

@@ -3,65 +3,28 @@ module github.com/digitalstudium/helmfmt
 go 1.25.1
 
 require (
+	github.com/Masterminds/sprig/v3 v3.3.0
 	github.com/spf13/cobra v1.10.1
 	gopkg.in/yaml.v3 v3.0.1
-	helm.sh/helm/v3 v3.19.0
 )
 
 require (
 	dario.cat/mergo v1.0.1 // indirect
-	github.com/BurntSushi/toml v1.5.0 // indirect
 	github.com/Masterminds/goutils v1.1.1 // indirect
 	github.com/Masterminds/semver/v3 v3.4.0 // indirect
-	github.com/Masterminds/sprig/v3 v3.3.0 // indirect
-	github.com/cyphar/filepath-securejoin v0.4.1 // indirect
 	github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc // indirect
-	github.com/emicklei/go-restful/v3 v3.12.2 // indirect
-	github.com/fxamacker/cbor/v2 v2.9.0 // indirect
-	github.com/go-logr/logr v1.4.2 // indirect
-	github.com/go-openapi/jsonpointer v0.21.0 // indirect
-	github.com/go-openapi/jsonreference v0.20.2 // indirect
-	github.com/go-openapi/swag v0.23.0 // indirect
-	github.com/gobwas/glob v0.2.3 // indirect
-	github.com/gogo/protobuf v1.3.2 // indirect
-	github.com/google/gnostic-models v0.7.0 // indirect
+	github.com/google/go-cmp v0.7.0 // indirect
 	github.com/google/uuid v1.6.0 // indirect
 	github.com/huandu/xstrings v1.5.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/josharian/intern v1.0.0 // indirect
-	github.com/json-iterator/go v1.1.12 // indirect
-	github.com/mailru/easyjson v0.7.7 // indirect
 	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/reflectwalk v1.0.2 // indirect
-	github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect
-	github.com/modern-go/reflect2 v1.0.3-0.20250322232337-35a7c28c31ee // indirect
-	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
-	github.com/pkg/errors v0.9.1 // indirect
-	github.com/santhosh-tekuri/jsonschema/v6 v6.0.2 // indirect
+	github.com/pmezard/go-difflib v1.0.1-0.20181226105442-5d4384ee4fb2 // indirect
+	github.com/rogpeppe/go-internal v1.13.1 // indirect
 	github.com/shopspring/decimal v1.4.0 // indirect
 	github.com/spf13/cast v1.7.0 // indirect
 	github.com/spf13/pflag v1.0.9 // indirect
-	github.com/x448/float16 v0.8.4 // indirect
-	go.yaml.in/yaml/v2 v2.4.2 // indirect
-	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	github.com/stretchr/testify v1.11.1 // indirect
 	golang.org/x/crypto v0.42.0 // indirect
-	golang.org/x/net v0.43.0 // indirect
-	golang.org/x/oauth2 v0.30.0 // indirect
-	golang.org/x/sys v0.36.0 // indirect
-	golang.org/x/term v0.35.0 // indirect
-	golang.org/x/text v0.29.0 // indirect
-	golang.org/x/time v0.12.0 // indirect
-	google.golang.org/protobuf v1.36.5 // indirect
-	gopkg.in/inf.v0 v0.9.1 // indirect
-	k8s.io/api v0.34.0 // indirect
-	k8s.io/apiextensions-apiserver v0.34.0 // indirect
-	k8s.io/apimachinery v0.34.0 // indirect
-	k8s.io/client-go v0.34.0 // indirect
-	k8s.io/klog/v2 v2.130.1 // indirect
-	k8s.io/kube-openapi v0.0.0-20250710124328-f3f2b991d03b // indirect
-	k8s.io/utils v0.0.0-20250604170112-4c0f3b243397 // indirect
-	sigs.k8s.io/json v0.0.0-20241014173422-cfa47c3a1cc8 // indirect
-	sigs.k8s.io/randfill v1.0.0 // indirect
-	sigs.k8s.io/structured-merge-diff/v6 v6.3.0 // indirect
-	sigs.k8s.io/yaml v1.6.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
 )