I composed this reponse using your code... on Windoze even! I just downloaded the code as-is, and it works right out of the box.

I can vouch for basic functionality, and it seems straightforward to use. If you plan to add more capabilities, here is my wishlist:

• Save to a file
• Do not pre-fill code, paragraphs, etc.
• More formatting: bold, italics, blockquote, h1, etc.

Bug report:

• Why are the 'readmore' tags surrounded by double quotes?
• paragraph tags can not be inserted at the cursor; they always show up at the bottom

Code review

• When I see blocks of comments, I think "POD". This also allows you to use perldoc as a manpage for your code.
• You could check your code with perlcritic
• I ran your code through perltidy
• Is there any point to checking whether the required modules are installed? Once you hit the actual 'use', won't the code die anyway?
• I've never used the Tk modules, but there seem to be a lot of variables

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