Issue 362 - sortNumeric

functions.go

@@ -22,8 +22,7 @@ import (
 //
 // Use this to pass the functions into the template engine:
 //
-// 	tpl := template.New("foo").Funcs(sprig.FuncMap()))
-//
+//	tpl := template.New("foo").Funcs(sprig.FuncMap()))
 func FuncMap() template.FuncMap {
 	return HtmlFuncMap()
 }
@@ -320,6 +319,7 @@ var genericMap = map[string]interface{}{
 	"mustLast":    mustLast,
 	"initial":     initial,
 	"mustInitial": mustInitial,
+	"sortNumeric": sortNumeric,
 	"reverse":     reverse,
 	"mustReverse": mustReverse,
 	"uniq":        uniq,
@@ -336,20 +336,20 @@ var genericMap = map[string]interface{}{
 	"mustChunk":   mustChunk,
 
 	// Crypto:
-	"bcrypt":            bcrypt,
-	"htpasswd":          htpasswd,
-	"genPrivateKey":     generatePrivateKey,
-	"derivePassword":    derivePassword,
-	"buildCustomCert":   buildCustomCertificate,
-	"genCA":             generateCertificateAuthority,
-	"genCAWithKey":      generateCertificateAuthorityWithPEMKey,
-	"genSelfSignedCert": generateSelfSignedCertificate,
+	"bcrypt":                   bcrypt,
+	"htpasswd":                 htpasswd,
+	"genPrivateKey":            generatePrivateKey,
+	"derivePassword":           derivePassword,
+	"buildCustomCert":          buildCustomCertificate,
+	"genCA":                    generateCertificateAuthority,
+	"genCAWithKey":             generateCertificateAuthorityWithPEMKey,
+	"genSelfSignedCert":        generateSelfSignedCertificate,
 	"genSelfSignedCertWithKey": generateSelfSignedCertificateWithPEMKey,
-	"genSignedCert":     generateSignedCertificate,
-	"genSignedCertWithKey": generateSignedCertificateWithPEMKey,
-	"encryptAES":        encryptAES,
-	"decryptAES":        decryptAES,
-	"randBytes":         randBytes,
+	"genSignedCert":            generateSignedCertificate,
+	"genSignedCertWithKey":     generateSignedCertificateWithPEMKey,
+	"encryptAES":               encryptAES,
+	"decryptAES":               decryptAES,
+	"randBytes":                randBytes,
 
 	// UUIDs:
 	"uuidv4": uuidv4,

list.go

@@ -243,6 +243,28 @@ func sortAlpha(list interface{}) []string {
 	return []string{strval(list)}
 }
 
+func sortNumeric(list interface{}) []string {
+	k := reflect.Indirect(reflect.ValueOf(list)).Kind()
+	switch k {
+	case reflect.Slice, reflect.Array:
+		switch v := list.(type) {
+		case []interface{}:
+			b := make([]int, 0, len(v))
+			for _, s := range v {
+				if s != nil {
+					b = append(b, toInt(s))
+				}
+			}
+			sort.IntSlice(b).Sort()
+			return strslice(b)
+		default:
+			return strslice(list)
+		}
+
+	}
+	return strslice(list)
+}
+
 func reverse(v interface{}) []interface{} {
 	l, err := mustReverse(v)
 	if err != nil {

list_test.go

@@ -188,6 +188,17 @@ func TestMustRest(t *testing.T) {
 	}
 }
 
+func TestSortNumeric(t *testing.T) {
+	// Named `append` in the function map
+	tests := map[string]string{
+		`{{ list 2 1 4 3 | sortNumeric }}`:       "[1 2 3 4]",
+		`{{ list 0 10 2 4 1 11 | sortNumeric }}`: "[0 1 2 4 10 11]",
+	}
+	for tpl, expect := range tests {
+		assert.NoError(t, runt(tpl, expect))
+	}
+}
+
 func TestReverse(t *testing.T) {
 	tests := map[string]string{
 		`{{ list 1 2 3 | reverse | first }}`:              "3",