View source for ReNamer:Pascal Script:FileName Utilities

==Basic FileName Utilities or How to skip extention==

A FileName variable is a string, so we can do with it anything that we could do with a string.

We already know how to concatenate (add together) strings. We did that in the previous chapter, when we were adding a prefix to a FileName. Let<nowiki>’</nowiki>s try to add a postfix now.

As before we will use a constant string ''<nowiki>’</nowiki>_part2<nowiki>’</nowiki>'' (constant strings in Pascal need to be enclosed in apostrophes) and concatenation operator (<nowiki>+</nowiki>).

<pre><nowiki>
begin
FileName:=FileName + '_part2';
end.
</nowiki></pre>

What we<nowiki>’</nowiki>ve got is ''<nowiki>’</nowiki>file.txt_part2<nowiki>’</nowiki>'' and that<nowiki>’</nowiki>s probably not what we expected, but it<nowiki>’</nowiki>s purely logical. We added together ''<nowiki>’</nowiki>file.txt<nowiki>’</nowiki>'' and ''<nowiki>’</nowiki>_part2<nowiki>’</nowiki>''. The result is correct.

So what we should do when we want to add something after the filename but before the extention. There is no <nowiki>’</nowiki>skip extention<nowiki>’</nowiki> option for PascalScript rules.

The answer is simple: we need to split the FileName into base filename and extention and insert ''<nowiki>’</nowiki>_part2<nowiki>’</nowiki>'' in between.

At that point ReNamer comes in hand with its standard procedures and functions. We will take a look on two main functions that you can find among FileName Utilities: WideExtractBaseName and WideExtractFileExt functions. I guess their names are clear enough. So let<nowiki>’</nowiki>s write our code.

<pre><nowiki>
begin
FileName:=WideExtractBaseName(FileName)+ '_part2'+ WideExtractFileExt(FileName);
end.
</nowiki></pre>

And that<nowiki>’</nowiki>s it. The result for ''<nowiki>’</nowiki>file.txt<nowiki>’</nowiki>'' is ''<nowiki>’</nowiki>file_part2.txt<nowiki>’</nowiki>''.