Avoid duplicated function code in NSIS

Question

Currently, I have the following scripts code.

Section "Uninstall"
...
...
Call un.DeleteDirIfEmpty 
SectionEnd


Function GetJRE
    ; Call must not be used with functions starting with "un." in the non-uninstall sections.
    Call
FunctionEnd


Function un.DeleteDirIfEmpty
...
...
FunctionEnd

Function DeleteDirIfEmpty
...
...
FunctionEnd

Note that, I need to provide 2 versions of DeleteDirIfEmpty, so that the same operation can be performed in non-uninstall section and uninstall section.

Their code is the same, just that the naming is different. un.DeleteDirIfEmpty and DeleteDirIfEmpty

How is it possible to have only 1 function, but is callable by any section?

Answer 1

Take a look at \Include\Util.nsh, it is used to turn a macro into a function:

!include Util.nsh

!macro MyFunction
MessageBox mb_ok "Hello World"
!macroend
!define MyFunction "${CallArtificialFunction} MyFunction"

Section
${MyFunction}
SectionEnd

Note: To delete a empty directory, just use RMDir (Without /r switch)