concat

docs/templatefuncs.md

@@ -10,6 +10,16 @@
 [one three]
 ```
 
+## `concat` *list*...
+
+`concat` concatenates *list*s into a new list.
+
+```text
+{{ concat (list 0 1 2) (list "a" "b" "c") }}
+
+[0 1 2 a b c]
+```
+
 ## `contains` *substring* *string*
 
 `contains` returns whether *substring* is in *string*.

go.mod

@@ -1,6 +1,6 @@
 module github.com/chezmoi/templatefuncs
 
-go 1.21
+go 1.22
 
 require github.com/alecthomas/assert/v2 v2.9.0
 

templatefuncs.go

@@ -33,6 +33,7 @@ var fileModeTypeNames = map[fs.FileMode]string{
 func NewFuncMap() template.FuncMap {
 	return template.FuncMap{
 		"compact":          compactTemplateFunc,
+		"concat":           slices.Concat[[]any],
 		"contains":         reverseArgs2(strings.Contains),
 		"eqFold":           eqFoldTemplateFunc,
 		"fromJSON":         eachByteSliceErr(fromJSONTemplateFunc),

templatefuncs_test.go

@@ -54,6 +54,10 @@ func TestFuncMap(t *testing.T) {
 			template: `{{ list "one" "" list "three" | compact }}`,
 			expected: `[one three]`,
 		},
+		{
+			template: `{{ concat (list 0 1 2) (list "a" "b" "c") }}`,
+			expected: "[0 1 2 a b c]",
+		},
 		{
 			template: `{{ "abc" | contains "bc" }}`,
 			expected: "true",