From 1bb39eba8717f62336cc98c5bb7cfbef194f3626 Mon Sep 17 00:00:00 2001
From: Wim <wim@42.be>
Date: Sat, 23 Feb 2019 16:39:44 +0100
Subject: Add scripting (tengo) support for every incoming message (#731)

TengoModifyMessage allows you to specify the location of a tengo (https://github.com/d5/tengo/) script.
This script will receive every incoming message and can be used to modify the Username and the Text of that message.
The script will have the following global variables:
to modify: msgUsername and msgText
to read: msgChannel and msgAccount

The script is reloaded on every message, so you can modify the script on the fly.

Example script can be found in https://github.com/42wim/matterbridge/tree/master/gateway/bench.tengo
and https://github.com/42wim/matterbridge/tree/master/contrib/example.tengo

The example below will check if the text contains blah and if so, it'll replace the text and the username of that message.
text := import("text")
if text.re_match("blah",msgText) {
    msgText="replaced by this"
    msgUsername="fakeuser"
}

More information about tengo on: https://github.com/d5/tengo/blob/master/docs/tutorial.md and
https://github.com/d5/tengo/blob/master/docs/stdlib.md
---
 .../github.com/d5/tengo/objects/builtin_print.go   | 75 ++++++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 vendor/github.com/d5/tengo/objects/builtin_print.go

(limited to 'vendor/github.com/d5/tengo/objects/builtin_print.go')

diff --git a/vendor/github.com/d5/tengo/objects/builtin_print.go b/vendor/github.com/d5/tengo/objects/builtin_print.go
new file mode 100644
index 00000000..c5fe36db
--- /dev/null
+++ b/vendor/github.com/d5/tengo/objects/builtin_print.go
@@ -0,0 +1,75 @@
+package objects
+
+import (
+	"fmt"
+)
+
+// print(args...)
+func builtinPrint(args ...Object) (Object, error) {
+	for _, arg := range args {
+		if str, ok := arg.(*String); ok {
+			fmt.Println(str.Value)
+		} else {
+			fmt.Println(arg.String())
+		}
+	}
+
+	return nil, nil
+}
+
+// printf("format", args...)
+func builtinPrintf(args ...Object) (Object, error) {
+	numArgs := len(args)
+	if numArgs == 0 {
+		return nil, ErrWrongNumArguments
+	}
+
+	format, ok := args[0].(*String)
+	if !ok {
+		return nil, ErrInvalidArgumentType{
+			Name:     "format",
+			Expected: "string",
+			Found:    args[0].TypeName(),
+		}
+	}
+	if numArgs == 1 {
+		fmt.Print(format)
+		return nil, nil
+	}
+
+	formatArgs := make([]interface{}, numArgs-1, numArgs-1)
+	for idx, arg := range args[1:] {
+		formatArgs[idx] = objectToInterface(arg)
+	}
+
+	fmt.Printf(format.Value, formatArgs...)
+
+	return nil, nil
+}
+
+// sprintf("format", args...)
+func builtinSprintf(args ...Object) (Object, error) {
+	numArgs := len(args)
+	if numArgs == 0 {
+		return nil, ErrWrongNumArguments
+	}
+
+	format, ok := args[0].(*String)
+	if !ok {
+		return nil, ErrInvalidArgumentType{
+			Name:     "format",
+			Expected: "string",
+			Found:    args[0].TypeName(),
+		}
+	}
+	if numArgs == 1 {
+		return format, nil // okay to return 'format' directly as String is immutable
+	}
+
+	formatArgs := make([]interface{}, numArgs-1, numArgs-1)
+	for idx, arg := range args[1:] {
+		formatArgs[idx] = objectToInterface(arg)
+	}
+
+	return &String{Value: fmt.Sprintf(format.Value, formatArgs...)}, nil
+}
-- 
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