View source for Backup files on install, restore on uninstall

{{PageAuthor|Afrow UK}}

== Description ==

Here are 2 simple macros for backing up and restoring files.

== Usage ==
<highlight-nsis>
!insertmacro BackupFile "Dir with file in it" "File" "Backup to"
!insertmacro RestoreFile "Backup dir with file in it" "File" "Restore to"
</highlight-nsis>

== Example ==

<highlight-nsis>
Section "Install Files"
#Backup old copy
!insertmacro BackupFile "$INSTDIR" "blah1.nsi" "$INSTDIR\nsi-backup"
#Install new copy
 File "/oname=$INSTDIR" "blah1.nsi"
SectionEnd

Section "Uninstall"
#Remove installed copy
 Delete "$INSTDIR\blah1.nsi"
#Restore old copy
!insertmacro RestoreFile "$INSTDIR\nsi-backup" "blah1.nsi" "$INSTDIR"
SectionEnd
</highlight-nsis>

== The Macros ==

<highlight-nsis>
!macro BackupFile FILE_DIR FILE BACKUP_TO
 IfFileExists "${BACKUP_TO}\*.*" +2
  CreateDirectory "${BACKUP_TO}"
 IfFileExists "${FILE_DIR}\${FILE}" 0 +2
  Rename "${FILE_DIR}\${FILE}" "${BACKUP_TO}\${FILE}"
!macroend
</highlight-nsis>
<highlight-nsis>
!macro RestoreFile BUP_DIR FILE RESTORE_TO
 IfFileExists "${BUP_DIR}\${FILE}" 0 +2
  Rename "${BUP_DIR}\${FILE}" "${RESTORE_TO}\${FILE}"
!macroend
</highlight-nsis>

-Stu
<highlight-nsis>
Note: By using above macros, create BackupFile.nsh and RestoreFile.nsh and save it nsis\include folder.
Then this should be included in your .nsi file as well.
example:!include BackupFile.nsh and !include RestoreFile.nsh
</highlight-nsis>
Note Added by Satish Kumar Barla:

[[Category:Disk, Path & File Functions]]