[msgformat] Add more mathematical functions

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

internal/template/numeric/numeric.go

@@ -1,10 +1,22 @@
 package numeric
 
-import "github.com/Luzifer/twitch-bot/plugins"
+import (
+	"math"
+
+	"github.com/Luzifer/twitch-bot/plugins"
+)
 
 func Register(args plugins.RegistrationArguments) error {
-	args.RegisterTemplateFunction("multiply", plugins.GenericTemplateFunctionGetter(multiply))
+	args.RegisterTemplateFunction("add", plugins.GenericTemplateFunctionGetter(add))
+	args.RegisterTemplateFunction("div", plugins.GenericTemplateFunctionGetter(div))
+	args.RegisterTemplateFunction("mul", plugins.GenericTemplateFunctionGetter(mul))
+	args.RegisterTemplateFunction("multiply", plugins.GenericTemplateFunctionGetter(mul)) // DEPRECATED
+	args.RegisterTemplateFunction("pow", plugins.GenericTemplateFunctionGetter(math.Pow))
+	args.RegisterTemplateFunction("sub", plugins.GenericTemplateFunctionGetter(sub))
 	return nil
 }
 
-func multiply(m1, m2 float64) float64 { return m1 * m2 }
+func add(m1, m2 float64) float64 { return m1 + m2 }
+func div(m1, m2 float64) float64 { return m1 / m2 }
+func mul(m1, m2 float64) float64 { return m1 * m2 }
+func sub(m1, m2 float64) float64 { return m1 - m2 }

wiki/Templating.md

@@ -25,6 +25,19 @@ Examples below are using this syntax in the code block:
 < Output from the template
 ```
 
+#### `add`
+
+Returns float from calculation: `float1 + float2`
+
+Syntax: `add <float1> <float2>`
+
+Example:
+
+```
+# {{ printf "%.0f" (add 1 2) }}%
+< 3
+```
+
 #### `arg`
 
 Takes the message sent to the channel, splits by space and returns the Nth element
@@ -104,6 +117,19 @@ Example:
 < Luziferus - foobar
 ```
 
+#### `div`
+
+Returns float from calculation: `float1 / float2`
+
+Syntax: `div <float1> <float2>`
+
+Example:
+
+```
+# {{ printf "%.0f" (div 27 9) }}%
+< 3
+```
+
 #### `fixUsername`
 
 Ensures the username no longer contains the `@` or `#` prefix
@@ -171,19 +197,32 @@ Example:
 < Last Quote: #32
 ```
 
-#### `multiply`
+#### `mul` (deprecated: `multiply`)
 
 Returns float from calculation: `float1 * float2`
 
-Syntax: `multiply <float1> <float2>`
+Syntax: `mul <float1> <float2>`
 
 Example:
 
 ```
-# {{ printf "%.0f" (multiply 100 (seededRandom "test")) }}%
+# {{ printf "%.0f" (mul 100 (seededRandom "test")) }}%
 < 35%
 ```
 
+#### `pow`
+
+Returns float from calculation: `float1 ** float2`
+
+Syntax: `pow <float1> <float2>`
+
+Example:
+
+```
+# {{ printf "%.0f" (pow 10 4) }}%
+< 10000
+```
+
 #### `recentGame`
 
 Returns the last played game name of the specified user (see shoutout example) or the `fallback` if the game could not be fetched. If no fallback was supplied the message will fail and not be sent.
@@ -223,6 +262,19 @@ Example:
 < Your int this hour: 17%
 ```
 
+#### `sub`
+
+Returns float from calculation: `float1 - float2`
+
+Syntax: `sub <float1> <float2>`
+
+Example:
+
+```
+# {{ printf "%.0f" (sub 10 4) }}%
+< 6
+```
+
 #### `tag`
 
 Takes the message sent to the channel, returns the value of the tag specified