Relative jumps

Suppose you have a macro that consists of 5 lines.

You do a

IfFileExists "$ApplicationDir\${MY_DIR}\${MY_EXE}" 0 +1

!insertmacro UnselectSection ${MySec}

I don't think will work because the macro is expanded into 5 lines. The +1 will jump into the middle of the macro code.

Other than using a label for the jump, is there a way around this?

I have about 7-8 lines od code that need this logic and didn't want to use a lot of labels.

u could do:

function UnselectSectionFunc
!insertmacro UnselectSection ${MySec}
functionend

IfFileExists "$ApplicationDir\${MY_DIR}\${MY_EXE}" 0 +1
call UnselectSectionFunc

First of all it should be +2 instead of +1 to jump over the next line.

Second, you should use a label when jumping over macros. A function won't help if you have to insert a macro multiple times with different parameters.

I'm thinking of going with something like this for now.

!macro SetSection SectionName FileToCheck

   !insertmacro SelectSection ${SectionName}

   IfFileExists ${FileToCheck} 0 Skip${SectionName}

      !insertmacro UnselectSection ${SectionName}

Skip${SectionName}:

!macroend

Another option is LogicLib, which hopefully makes scripts more readable:

!include LogicLib.nsh



...



${If} ${FileExists} "$ApplicationDir\${MY_DIR}\${MY_EXE}"

  !insertmacro UnselectSection ${MySec}

${EndIf}