Add Min function to sprig helmette

Min function is required for config map conversion.

Reference

https://github.com/redpanda-data/helm-charts/blob/dbb0f32801a85eca072bca6f401037d316df4470/charts/redpanda/templates/_configmap.tpl#L76

pkg/gotohelm/helmette/sprig.go

@@ -3,6 +3,7 @@ package helmette
 import (
 	"encoding/json"
 	"fmt"
+	"math"
 	"reflect"
 	"regexp"
 	"sort"
@@ -14,6 +15,18 @@ import (
 	"golang.org/x/exp/maps"
 )
 
+// Min is the go equivalent of sprig's `min`
+// +gotohelm:builtin=min
+func Min(in ...int) int {
+	result := math.MaxInt
+	for _, i := range in {
+		if i < result {
+			result = i
+		}
+	}
+	return result
+}
+
 // First function can not return `T` as sprig implementation
 // will return nil if array is of the size 0.
 //

pkg/gotohelm/testdata/src/example/sprig/sprig.go

@@ -27,6 +27,19 @@ func Sprig() map[string]any {
 		"len":      lenTest(),
 		"first":    first(),
 		"toString": toString(),
+		"min":     minFunc(),
+	}
+}
+
+func minFunc() []int {
+	return []int{
+		// spig Min function does not allow to not pass parameters. Error returned from helm template:
+		// wrong number of args for min: want at least 1 got 0
+		//helmette.Min(),
+		helmette.Min(-1, 0, 1),
+		helmette.Min(1),
+		helmette.Min(2, 1),
+		helmette.Min(1, 1, 2),
 	}
 }
 

pkg/gotohelm/testdata/src/example/sprig/sprig.rewritten.go

@@ -28,6 +28,19 @@ func Sprig() map[string]any {
 		"len":      lenTest(),
 		"first":    first(),
 		"toString": toString(),
+		"min":      minFunc(),
+	}
+}
+
+func minFunc() []int {
+	return []int{
+		// spig Min function does not allow to not pass parameters. Error returned from helm template:
+		// wrong number of args for min: want at least 1 got 0
+		//helmette.Min(),
+		helmette.Min(-1, 0, 1),
+		helmette.Min(1),
+		helmette.Min(2, 1),
+		helmette.Min(1, 1, 2),
 	}
 }
 

pkg/gotohelm/testdata/src/example/sprig/sprig.yaml

@@ -2,7 +2,14 @@
 
 {{- define "sprig.Sprig" -}}
 {{- range $_ := (list 1) -}}
-{{- (dict "r" (dict "concat" (get (fromJson (include "sprig.concat" (dict "a" (list ) ))) "r") "default" (get (fromJson (include "sprig.default_" (dict "a" (list ) ))) "r") "keys" (get (fromJson (include "sprig.keys" (dict "a" (list ) ))) "r") "empty" (get (fromJson (include "sprig.empty" (dict "a" (list ) ))) "r") "strings" (get (fromJson (include "sprig.stringsFunctions" (dict "a" (list ) ))) "r") "unset" (get (fromJson (include "sprig.unset" (dict "a" (list ) ))) "r") "regex" (get (fromJson (include "sprig.regex" (dict "a" (list ) ))) "r") "atoi" (get (fromJson (include "sprig.atoi" (dict "a" (list ) ))) "r") "float" (get (fromJson (include "sprig.float" (dict "a" (list ) ))) "r") "len" (get (fromJson (include "sprig.lenTest" (dict "a" (list ) ))) "r") "first" (get (fromJson (include "sprig.first" (dict "a" (list ) ))) "r") "toString" (get (fromJson (include "sprig.toString" (dict "a" (list ) ))) "r") )) | toJson -}}
+{{- (dict "r" (dict "concat" (get (fromJson (include "sprig.concat" (dict "a" (list ) ))) "r") "default" (get (fromJson (include "sprig.default_" (dict "a" (list ) ))) "r") "keys" (get (fromJson (include "sprig.keys" (dict "a" (list ) ))) "r") "empty" (get (fromJson (include "sprig.empty" (dict "a" (list ) ))) "r") "strings" (get (fromJson (include "sprig.stringsFunctions" (dict "a" (list ) ))) "r") "unset" (get (fromJson (include "sprig.unset" (dict "a" (list ) ))) "r") "regex" (get (fromJson (include "sprig.regex" (dict "a" (list ) ))) "r") "atoi" (get (fromJson (include "sprig.atoi" (dict "a" (list ) ))) "r") "float" (get (fromJson (include "sprig.float" (dict "a" (list ) ))) "r") "len" (get (fromJson (include "sprig.lenTest" (dict "a" (list ) ))) "r") "first" (get (fromJson (include "sprig.first" (dict "a" (list ) ))) "r") "toString" (get (fromJson (include "sprig.toString" (dict "a" (list ) ))) "r") "min" (get (fromJson (include "sprig.minFunc" (dict "a" (list ) ))) "r") )) | toJson -}}
+{{- break -}}
+{{- end -}}
+{{- end -}}
+
+{{- define "sprig.minFunc" -}}
+{{- range $_ := (list 1) -}}
+{{- (dict "r" (list (min -1 0 1) (min 1) (min 2 1) (min 1 1 2))) | toJson -}}
 {{- break -}}
 {{- end -}}
 {{- end -}}