I would like to prompt the user for extra information if a certain component is selected, but I'm not really sure how to check that a given component is selected. It seems like http://nsis.sourceforge.net/Docs/Chapter4.html#4.9.13.2 might be somehow related, but I was under the impression that a section is a group of components...
Given help from Anders I have this that works:
!include MUI.nsh
!include nsDialogs.nsh
!include LogicLib.nsh
!include sections.nsh
Name A
InstProgressFlags smooth colored
LicenseBkColor /windows
OutFile A.exe
InstallDir $PROGRAMFILES\A
Var Dialog
Section "A" SEC_A
SectionEnd
Section "B" SEC_B
SectionEnd
!insertmacro MUI_PAGE_COMPONENTS
Page custom getA setA # {{{
!insertmacro MUI_PAGE_DIRECTORY # {{{ install
Function getA
${Unless} ${SectionIsSelected} ${SEC_A}
Abort
${EndUnless}
nsDialogs::Create 1018
Pop $Dialog
${If} $Dialog == error
Abort
${EndIf}
${NSD_CreateLabel} 0 0 100% 12u "Test"
nsDialogs::Show
FunctionEnd
Function setA
MessageBox MB_OK "clicked?"
FunctionEnd
# }}}
!insertmacro MUI_PAGE_INSTFILES
!insertmacro MUI_UNPAGE_CONFIRM
!insertmacro MUI_UNPAGE_INSTFILES