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!include "WinMessages.nsh"

; see https://support.microsoft.com/en-us/kb/104011

!define Environ 'HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"'

; HKEY_LOCAL_MACHINE = 0x80000002

; AddToPath - Appends dir to PATH

; (does not work on Win9x/ME)

;

; Usage:

; Push "dir"

; Call AddToPath

Function AddToPath

Exch $0

Push $1

Push $2

Push $3

Push $4

; NSIS ReadRegStr returns empty string on string overflow

; Native calls are used here to check actual length of PATH

; $4 = RegOpenKey(HKEY_LOCAL_MACHINE, "SYSTEM\CurrentControlSet\Control\Session Manager\Environment", &$3)

System::Call "advapi32::RegOpenKey(i 0x80000002, t'SYSTEM\CurrentControlSet\Control\Session Manager\Environment', *i.r3) i.r4"

IntCmp $4 0 0 done done

; $4 = RegQueryValueEx($3, "PATH", (DWORD*)0, (DWORD*)0, &$1, ($2=NSIS_MAX_STRLEN, &$2))

; RegCloseKey($3)

System::Call "advapi32::RegQueryValueEx(i $3, t'PATH', i 0, i 0, t.r1, *i ${NSIS_MAX_STRLEN} r2) i.r4"

System::Call "advapi32::RegCloseKey(i $3)"

IntCmp $4 234 0 +4 +4 ; $4 == ERROR_MORE_DATA

DetailPrint "AddToPath: original length $2 > ${NSIS_MAX_STRLEN}"

MessageBox MB_OK "PATH not updated, original length $2 > ${NSIS_MAX_STRLEN}"

Goto done

IntCmp $4 0 +5 ; $4 != NO_ERROR

IntCmp $4 2 +3 ; $4 != ERROR_FILE_NOT_FOUND

DetailPrint "AddToPath: unexpected error code $4"

Goto done

StrCpy $1 ""

; Check if already in PATH

Push "$1;"

Push "$0;"

Call StrStr

Pop $2

StrCmp $2 "" 0 done

Push "$1;"

Push "$0\;"

Call StrStr

Pop $2

StrCmp $2 "" 0 done

; Prevent NSIS string overflow

StrLen $2 $0

StrLen $3 $1

IntOp $2 $2 + $3

IntOp $2 $2 + 2 ; $2 = strlen(dir) + strlen(PATH) + sizeof(";")

IntCmp $2 ${NSIS_MAX_STRLEN} +4 +4 0

DetailPrint "AddToPath: new length $2 > ${NSIS_MAX_STRLEN}"

MessageBox MB_OK "PATH not updated, new length $2 > ${NSIS_MAX_STRLEN}."

Goto done

; Append dir to PATH

DetailPrint "Add to PATH: $0"

StrCpy $2 $1 1 -1

StrCmp $2 ";" 0 +2

StrCpy $1 $1 -1 ; remove trailing ';'

StrCmp $1 "" +2 ; no leading ';'

StrCpy $0 "$1;$0"

WriteRegExpandStr ${Environ} "PATH" $0

SendMessage ${HWND_BROADCAST} ${WM_WININICHANGE} 0 "STR:Environment" /TIMEOUT=5000

done:

Pop $4

Pop $3

Pop $2

Pop $1

Pop $0

FunctionEnd

; RemoveFromPath - Removes dir from PATH

;

; Usage:

; Push "dir"

; Call RemoveFromPath

Function un.RemoveFromPath

Exch $0

Push $1

Push $2

Push $3

Push $4

Push $5

Push $6

; NSIS ReadRegStr returns empty string on string overflow

; Native calls are used here to check actual length of PATH

; $4 = RegOpenKey(HKEY_LOCAL_MACHINE, "SYSTEM\CurrentControlSet\Control\Session Manager\Environment", &$3)

System::Call "advapi32::RegOpenKey(i 0x80000002, t'SYSTEM\CurrentControlSet\Control\Session Manager\Environment', *i.r3) i.r4"

IntCmp $4 0 0 done done

; $4 = RegQueryValueEx($3, "PATH", (DWORD*)0, (DWORD*)0, &$1, ($2=NSIS_MAX_STRLEN, &$2))

; RegCloseKey($3)

System::Call "advapi32::RegQueryValueEx(i $3, t'PATH', i 0, i 0, t.r1, *i ${NSIS_MAX_STRLEN} r2) i.r4"

System::Call "advapi32::RegCloseKey(i $3)"

IntCmp $4 234 0 +4 +4 ; $4 == ERROR_MORE_DATA

DetailPrint "RemoveFromPath: original length $2 > ${NSIS_MAX_STRLEN}"

MessageBox MB_OK "PATH not updated, original length $2 > ${NSIS_MAX_STRLEN}"

Goto done

IntCmp $4 0 +5 ; $4 != NO_ERROR

IntCmp $4 2 +3 ; $4 != ERROR_FILE_NOT_FOUND

DetailPrint "RemoveFromPath: unexpected error code $4"

Goto done

StrCpy $1 ""

; length < ${NSIS_MAX_STRLEN} -> ReadRegStr can be used

ReadRegStr $1 ${Environ} "PATH"

StrCpy $5 $1 1 -1

StrCmp $5 ";" +2

StrCpy $1 "$1;" ; ensure trailing ';'

Push $1

Push "$0;"

Call un.StrStr

Pop $2 ; pos of our dir

StrCmp $2 "" done

DetailPrint "Remove from PATH: $0"

StrLen $3 "$0;"

StrLen $4 $2

StrCpy $5 $1 -$4 ; $5 is now the part before the path to remove

StrCpy $6 $2 "" $3 ; $6 is now the part after the path to remove

StrCpy $3 "$5$6"

StrCpy $5 $3 1 -1

StrCmp $5 ";" 0 +2

StrCpy $3 $3 -1 ; remove trailing ';'

WriteRegExpandStr ${Environ} "PATH" $3

SendMessage ${HWND_BROADCAST} ${WM_WININICHANGE} 0 "STR:Environment" /TIMEOUT=5000

done:

Pop $6

Pop $5

Pop $4

Pop $3

Pop $2

Pop $1

Pop $0

FunctionEnd