How to escape control characters?

[Salih Dincer]

On Tuesday, 23 August 2022 at 13:09:01 UTC, Steven Schveighoffer 
wrote:
> Without allocations. This took me longer than I had hoped it 
> would. It needs the 1-char buffer to avoid sending the 
> surrounding quotes.

Surely what Steve does is better. But for some reason I like 
simple and useful things.

I sometimes use custom string wrapping.  Maybe it will be useful 
for you, for example:

```d
struct String {
   string str;
   alias str this;
   import std.format, std.string;
   void toString(scope void delegate(const(char)[]) sink,
                 FormatSpec!char fmt)const
   {
     auto arr = str.lineSplitter;
     if(fmt.spec == 'n') {
       sink.formattedWrite("%-(%s\\n%)", arr);
     } else sink.formattedWrite("%s", str);
   }
} unittest {
   import std.stdio;
   auto str = `this
   is a
   string`;
   String Str; // simple constructor
   Str = str; // direct assign

   Str.writefln!"%n"; // "this\n  is a\n  string"
   Str.writefln!"%s"; /*
this
   is a
   string
*/
}
```

The nice thing here is that you can change the format specifiers 
as you wish.

Thank you all...

SDB at 79