Add Remove All Whitespace in Pascal

archive/p/pascal/remove_all_whitespace.pas

@@ -0,0 +1,47 @@
+program RemoveAllWhitespace;
+
+{$mode objfpc}{$H+}
+
+uses
+   SysUtils;
+
+procedure ShowUsage;
+begin
+   Writeln('Usage: please provide a string');
+   Halt(1);
+end;
+
+function RemoveWhitespace(const S: string): string;
+var
+   builder: TStringBuilder;
+   ch: char;
+begin
+   builder := TStringBuilder.Create;
+   try
+      for ch in S do
+         case ch of
+            ' ', #9, #10, #13: Continue;
+            else
+               builder.Append(ch);
+         end;
+
+      Result := builder.ToString;
+   finally
+      builder.Free;
+   end;
+end;
+
+var
+   Input: string;
+   Output: string;
+begin
+   if ParamCount <> 1 then
+      ShowUsage;
+
+   Input := ParamStr(1);
+   if Input = '' then
+      ShowUsage;
+
+   Output := RemoveWhitespace(Input);
+   Writeln(Output);
+end.