Purpose

Using TextPad to log projects or task progress.  Need to insert calendar into the editing text file.

Investigation

• addon - just an console external tool
• macros - recorded actions
• clips - .tcl, but it's not tcl code.  just some format with pre-defined text.

Conclusion

With TextPad, only possibility to achieve the goal is to use addon.  Create custom addon to output calendar, and running it will output to a separate document window.  And just copy and paste the generated text.  It's not ideal, but there is no way to manipulate existing text.

Misc

Install macros

1. From the Configure menu, choose Preferences.
2. Select "Macros" on the Preferences dialog box.
3. Select the macro from the list of available macros.
4. Click Add.
5. Click OK.

Install addon utilities

1. Configure->Preferences and selecting Tools in the tree. 
2. Click Add-> Program and select the target program.
3. Check HELP document for available parameters.

http://unxutils.sourceforge.net/
https://sourceforge.net/projects/unxutils/
Install, just add to path.  E.g. http://www.redantigua.com/unxutils-win.html


READ diff btw UnxUtils and GnuWin32:
https://superuser.com/questions/168202/difference-between-unxutils-and-gnuwin32