Append sprig template functions with sprig prefix

go.mod

@@ -1,9 +1,12 @@
 module github.com/kelseyhightower/confd
 
-go 1.19
+go 1.23.0
+
+toolchain go1.23.5
 
 require (
 	github.com/BurntSushi/toml v0.3.1
+	github.com/Masterminds/sprig/v3 v3.2.3
 	github.com/aws/aws-sdk-go v1.44.107
 	github.com/fsnotify/fsnotify v1.5.4
 	github.com/garyburd/redigo v1.6.4
@@ -17,6 +20,10 @@ require (
 )
 
 require (
+	github.com/Masterminds/goutils v1.1.1 // indirect
+	github.com/Masterminds/semver v1.5.0 // indirect
+	github.com/Masterminds/semver/v3 v3.2.0 // indirect
+	github.com/Masterminds/sprig v2.22.0+incompatible // indirect
 	github.com/armon/go-metrics v0.3.10 // indirect
 	github.com/armon/go-radix v1.0.0 // indirect
 	github.com/cenkalti/backoff/v3 v3.0.0 // indirect
@@ -26,6 +33,7 @@ require (
 	github.com/gogo/protobuf v1.3.2 // indirect
 	github.com/golang/protobuf v1.5.2 // indirect
 	github.com/golang/snappy v0.0.4 // indirect
+	github.com/google/uuid v1.6.0 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
 	github.com/hashicorp/go-hclog v0.16.2 // indirect
@@ -45,27 +53,31 @@ require (
 	github.com/hashicorp/serf v0.9.7 // indirect
 	github.com/hashicorp/vault/sdk v0.6.0 // indirect
 	github.com/hashicorp/yamux v0.0.0-20180604194846-3520598351bb // indirect
+	github.com/huandu/xstrings v1.5.0 // indirect
+	github.com/imdario/mergo v0.3.16 // indirect
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/konsorten/go-windows-terminal-sequences v1.0.3 // indirect
 	github.com/mattn/go-colorable v0.1.6 // indirect
 	github.com/mattn/go-isatty v0.0.12 // indirect
-	github.com/mitchellh/copystructure v1.0.0 // indirect
+	github.com/mitchellh/copystructure v1.2.0 // indirect
 	github.com/mitchellh/go-homedir v1.1.0 // indirect
 	github.com/mitchellh/go-testing-interface v1.0.0 // indirect
 	github.com/mitchellh/mapstructure v1.5.0 // indirect
-	github.com/mitchellh/reflectwalk v1.0.0 // indirect
+	github.com/mitchellh/reflectwalk v1.0.2 // indirect
 	github.com/oklog/run v1.0.0 // indirect
 	github.com/pierrec/lz4 v2.5.2+incompatible // indirect
 	github.com/ryanuber/go-glob v1.0.0 // indirect
+	github.com/shopspring/decimal v1.2.0 // indirect
+	github.com/spf13/cast v1.3.1 // indirect
 	go.etcd.io/etcd/api/v3 v3.5.5 // indirect
 	go.etcd.io/etcd/client/pkg/v3 v3.5.5 // indirect
 	go.uber.org/atomic v1.9.0 // indirect
 	go.uber.org/multierr v1.6.0 // indirect
 	go.uber.org/zap v1.17.0 // indirect
-	golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97 // indirect
-	golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd // indirect
-	golang.org/x/sys v0.0.0-20220412211240-33da011f77ad // indirect
-	golang.org/x/text v0.3.7 // indirect
+	golang.org/x/crypto v0.39.0 // indirect
+	golang.org/x/net v0.21.0 // indirect
+	golang.org/x/sys v0.33.0 // indirect
+	golang.org/x/text v0.26.0 // indirect
 	golang.org/x/time v0.0.0-20200416051211-89c76fbcd5d1 // indirect
 	google.golang.org/genproto v0.0.0-20210602131652-f16073e35f0c // indirect
 	google.golang.org/grpc v1.41.0 // indirect

resource/template/resource.go

@@ -15,6 +15,7 @@ import (
 	"text/template"
 
 	"github.com/BurntSushi/toml"
+	"github.com/Masterminds/sprig/v3"
 	"github.com/kelseyhightower/confd/backends"
 	"github.com/kelseyhightower/confd/log"
 	util "github.com/kelseyhightower/confd/util"
@@ -85,6 +86,12 @@ func NewTemplateResource(path string, config Config) (*TemplateResource, error)
 	tr.funcMap = newFuncMap()
 	tr.store = memkv.New()
 	tr.syncOnly = config.SyncOnly
+	sprigFuncMap := sprig.TxtFuncMap()
+
+	for funcName, sprigFunc := range sprigFuncMap {
+		addFunc(tr.funcMap, "sprig"+strings.Title(funcName), sprigFunc)
+	}
+
 	addFuncs(tr.funcMap, tr.store.FuncMap)
 
 	if config.Prefix != "" {

resource/template/template_funcs.go

@@ -54,6 +54,10 @@ func newFuncMap() map[string]interface{} {
 	return m
 }
 
+func addFunc(out map[string]interface{}, fName string, fBody interface{}) {
+	out[fName] = fBody
+}
+
 func addFuncs(out, in map[string]interface{}) {
 	for name, fn := range in {
 		out[name] = fn