[template] Add inList function

Signed-off-by: Knut Ahlers <knut@ahlers.me>

internal/template/slice/slice.go

@@ -0,0 +1,11 @@
+package slice
+
+import (
+	"github.com/Luzifer/go_helpers/v2/str"
+	"github.com/Luzifer/twitch-bot/plugins"
+)
+
+func Register(args plugins.RegistrationArguments) error {
+	args.RegisterTemplateFunction("inList", plugins.GenericTemplateFunctionGetter(str.StringInSlice))
+	return nil
+}

plugins_core.go

@@ -27,6 +27,7 @@ import (
 	"github.com/Luzifer/twitch-bot/internal/apimodules/overlays"
 	"github.com/Luzifer/twitch-bot/internal/template/numeric"
 	"github.com/Luzifer/twitch-bot/internal/template/random"
+	"github.com/Luzifer/twitch-bot/internal/template/slice"
 	"github.com/Luzifer/twitch-bot/plugins"
 	"github.com/Luzifer/twitch-bot/twitch"
 )
@@ -52,6 +53,7 @@ var (
 		// Template functions
 		numeric.Register,
 		random.Register,
+		slice.Register,
 
 		// API-only modules
 		customevent.Register,

wiki/Templating.md

@@ -184,6 +184,21 @@ Example:
 < test - oops
 ```
 
+#### `inList`
+
+Tests whether a string is in a given list of strings (for conditional templates).
+
+Syntax: `inList "search" "item1" "item2" [...]`
+
+Example:
+
+```
+! !command (.*)
+> !command foo
+# {{ inList (group 1) "foo" "bar" }}
+< true
+```
+
 #### `lastQuoteIndex`
 
 Gets the last quote index in the quote database for the current channel