These manuals contain the definition of all the commands that Scrupp implements. The plugins written in Lua are documented as well.
As Scrupp uses Lua as scripting language, I recommend to use its Reference Manual and the book Programming in Lua, Second Edition. The first edition of this book is available online. The first edition is aimed at Lua 5.0 and not 5.1 which Scrupp is using. Nevertheless it's worth reading. Of course you can buy the second edition afterwards.
Select the version of Scrupp and the type of the manual:
|SVN (not necessarily complete or up to date)||Online||Single HTML file|
|0.4 (latest)||Online||Single HTML file|
|0.2||Online||Single HTML file|
|0.1||Online||Single HTML file|
All manuals are freely available under the terms of the Scrupp license.