liveBackup.vbs (v1.1)

'Live File Backup Script v1.1
'Written by Aaron Loessberg-Zahl
'Last modified 11 Nov 2011
'
'Copies files from a source directory (or a single source file)
'to a backup destination as they are changed in the source.
'
'This script must be run from the command line.
'
'For comments/questions/bugs, please contact
'<[email protected]> or <[email protected]>.
'
' ----------------------------------------------------------------------------
' "THE BEER-WARE LICENSE" (Revision 2659):
' <[email protected]> wrote this file. As long as you retain this
' notice, you can do whatever you want with this stuff. If we meet some day,
' and you think this stuff is worth it, you can buy me a beer in return.
' ----------------------------------------------------------------------------
'
'Changelog:
'v1.1  11-11-2011  amloessb  Added check for non-numeric interval
'v1.0  11-09-2011  amloessb  First working version

Option Explicit

Dim objFSO, objSource, objDest, objChildren, objFiles, objDestFile, args
Dim strSource, strDest, strDestFile, strFilename, strChoice, strAnswer, strHeader
Dim subfolder, file, strDestFolder, objDestFolder, strNewFileList, strSize, strName
Dim dateSrcModified, dateDestModified, dateModified
Dim badAnswer, newFiles, isFileOp
Dim objSubFol, objSubFiles, oSrc, oDest
Dim intInterval
Dim DTab, TTab

'ynAnswer ()
'Purpose: Reads in an answer from StdIn, and loops if it is not "y" or "n"
'         The case of the user's answer does not matter.
'Returns: the answer "y" or "n"
Function ynAnswer ()
    badAnswer = True
    While badAnswer
        WScript.StdIn.Read(0)
        strChoice = WScript.StdIn.ReadLine()
        If Lcase(strChoice) = "n" Then
            ynAnswer = "n"
            badAnswer = False
        ElseIf Lcase(strChoice) = "y" Then
            ynAnswer = "y"
            badAnswer = False
        Else
            WScript.StdOut.Write "Please answer y or n > "
        End If
    WEnd
End Function

'confirmOp (src, dest, fileOp)
'Purpose: Asks the user to confirm the backup settings
'Returns: N/A
'Depends on ynAnswer
Function confirmOp (src, dest, fileOp)
    WScript.StdOut.Write "The script will now backup "
    If Not fileOp Then
        WScript.StdOut.Write "the contents of" & VBCrLf
    Else
        WScript.StdOut.Write VBCrLf
    End If
    WScript.Echo src
    WScript.Echo "to"
    WScript.Echo dest
    WScript.Echo ""
    WScript.StdOut.Write "Is this correct? [y/n] > "
    strAnswer = ynAnswer()
    If strAnswer = "n" Then
        WScript.Quit 0
    End If
End Function

'printCopyInfo (src)
'Purpose: Prints the time, name, and size of the given file or folder
'Returns: N/A
Function printCopyInfo (src)
    dateModified = src.DateLastModified
    strSize = FormatNumber((src.Size / 1024.0), 2)
    strName = src.Name
    'WScript.StdOut.Write VBCrLf
    WScript.Echo dateModified & VBTab & strName & VBTab & strSize & "K"
End Function

'compareDateModified (strSrc, strDest, strMsg)
'Purpose: Appends the file information to strMsg if the dest file is newer
'Returns: strMsg, with the file's entry appended if the dest file is newer
Function compareDateModified (strSrc, strDest, strMsg)
    If objFSO.FileExists(strDest) Then
        Set oDest = objFSO.GetFile(strDest)
        Set oSrc = objFSO.GetFile(objFSO.BuildPath(strSrc,oDest.Name))
        dateSrcModified = oSrc.DateLastModified
        dateDestModified = oDest.DateLastModified
        If dateDestModified > dateSrcModified Then
            compareDateModified = strMsg & oSrc.Name & DTab & dateSrcModified & _
                                  DTab & dateDestModified & VBCrLf
        End If
    End If
End Function

'folderCompareDateModified (strSrc, strDest, strMsg)
'Purpose: Recursive compareDateModified, by folder
'Returns: strMsg, appended to as necessary
Function folderCompareDateModified (strSrc, strDest, strMsg)
    If objFSO.FolderExists(strDest) Then
        Set oSrc = objFSO.GetFolder(strSrc)
        Set oDest = objFSO.GetFolder(strDest)
        For Each file In oSrc.Files
            strMsg = compareDateModified(strSrc, objFSO.BuildPath(strDestFolder, file.Name), strMsg)
        Next
        For Each subfolder In objFSO.GetFolder(strSrc).SubFolders
            strDestFolder = objFSO.BuildPath(strDest, subfolder.Name)
            strMsg = folderCompareDateModified (subfolder.Path, objFSO.BuildPath(strDestFolder, subfolder.Name), strMsg)
        Next
    End If
    folderCompareDateModified = strMsg
End Function

'compareAndCopy (oSrc, oDest, dest)
'Purpose: Copies oSrc to dest if oSrc is newer. 'dest' is the folder that oSrc
'         will be copied into, while oDest is the file/folder that oSrc will be
'         replacing.
'Returns: N/A
Function compareAndCopy (oSrc, oDest, dest)
    'Failsafe (source and destination names must match)
    If Not oSrc.Name = oDest.Name Then
        WScript.Echo "FAIL: " & oSrc.Name & " != " & oDest.Name
        WScript.Quit 2
    End If
    dateSrcModified = oSrc.DateLastModified
    dateDestModified = oDest.DateLastModified
    If dateSrcModified > dateDestModified Or Not oSrc.Size = oDest.Size Then
        oSrc.Copy dest, True
        Call printCopyInfo(oSrc)
    Else
        'WScript.StdOut.Write "."
    End If
End Function

'folderCompareAndCopy (oSrc, oDest, dest)
'Purpose: Recursive compareAndCopy, by folder
'Returns: N/A
'Depends on compareAndCopy
Function folderCompareAndCopy (oSrc, oDest, dest)
    'Failsafe (source and destination names must match)
    If Not oSrc.Name = oDest.Name Then
        WScript.Echo "FAIL: " & oSrc.Name & " != " & oDest.Name
        WScript.Quit 2
    End If
    Set objSubFol = oSrc.SubFolders
    Set objSubFiles = oSrc.Files
    'Recursion end case: individual files
    For Each file In objSubFiles
        strDestFolder = oDest.Path
        strDestFolder = fixFolderStr(strDestFolder)
        strDestFile = objFSO.BuildPath(oDest.Path, file.Name)
        If Not objFSO.FileExists(strDestFile) Then
            objFSO.CreateTextFile strDestFile
        End If
        Set objDestFile = objFSO.GetFile(strDestFile)
        Call compareAndCopy(file, objDestFile, strDestFolder)
    Next
    'Recurse through all subfolders
    For Each subfolder In objSubFol
        strDestFolder = objFSO.BuildPath(oDest.Path, subfolder.Name)
        If Not objFSO.FolderExists(strDestFolder) Then
            objFSO.CreateFolder(strDestFolder)
        End If
        Set objDestFolder = objFSO.GetFolder(strDestFolder)
        Call folderCompareAndCopy(subfolder, objDestFolder, oDest.Path)
    Next
End Function

'fixFolderStr (folder)
'Purpose: Put a trailing \ on the folder path if it's missing
'Returns: The correctrd path string
Function fixFolderStr (folder)
    If Not Mid(folder,Len(folder),1) = "\" Then
        fixFolderStr = folder & "\"
    Else
        fixFolderStr = folder
    End If
End Function

'---MAIN FUNCTION START---

Set args = WScript.Arguments
DTab = VBTab & VBTab
TTab = VBTab & VBTab & VBTab
badAnswer = True
newFiles = False
strHeader = "Name" & TTab & "Source Date"& TTab & "Destination Date"
strNewFileList = ""
intInterval = 5

'Print the usage statement
If Not (WScript.Arguments.Count = 2 Or WScript.Arguments.Count = 3) Then
    WScript.Echo ""
    WScript.Echo "Usage: cscript liveBackup.vbs <source> <destination> [interval]"
    WScript.Echo ""
    WScript.Echo "Checks the source every {interval} seconds for changes, and copies changed"
    WScript.Echo "files to the destination.  Folder hierarchies are preserved."
    WScript.Echo ""
    WScript.Echo "Arguments:"
    WScript.Echo "source      - the source directory or file to be backed up"
    WScript.Echo "destination - the destination directory where the backup will be saved"
    WScript.Echo "interval    - the frequency (in seconds) at which the script will check"
    WScript.Echo "              for changes in the source (default: 5)"
    WScript.Quit 1
End If

strSource = args(0)
strDest = args(1)

If IsNumeric(args(2)) Then
    intInterval = args(2)
Else
    WScript.Echo "The supplied interval is not a number."
    WScript.Echo "Using the default interval of 5 seconds."
End If

Set objFSO = CreateObject("Scripting.FileSystemObject")

If objFSO.FolderExists(strDest) Then
    Set objDest = objFSO.GetFolder(strDest)
    If objFSO.FolderExists(strSource) Then
        'Directory backup mode
        isFileOp = False
        Set objDest = objFSO.GetFolder(strDest)
        Set objSource = objFSO.GetFolder(strSource)
        Set objChildren = objSource.SubFolders
        Set objFiles = objSource.Files
        'Check for new folders in the destination
        For Each subfolder In objChildren
            strDestFolder = objFSO.BuildPath(strDest, subfolder.Name)
            strNewFileList = folderCompareDateModified (subfolder.Path, strDestFolder, strNewFileList)
        Next
        'Check for new files in the destination
        For Each file In objFiles
            strDestFile = objFSO.BuildPath(strDest, file.Name)
            strNewFileList = compareDateModified (strSource, strDestFile, strNewFileList)
        Next
        'If there are newer folders/files in the dest, print list
        If Not strNewFileList = "" Then
            WScript.Echo strHeader
            WScript.Echo strNewFileList
            WScript.Echo "The above files are newer at the destination then at the source."
            WScript.Echo "You will lose any changes you have made to the destination files"
            WScript.Echo "if you choose to continue."
            WScript.Echo ""
            WScript.StdOut.Write "Would you like to continue anyway? [y/n] > "
            strAnswer = ynAnswer()
            If strAnswer = "n" Then
                WScript.Quit 0
            End If
        End If
        'Put a trailing \ on the destination path if it's missing
        strDest = fixFolderStr(strDest)
        'Confirm the operation
        Call confirmOp(strSource, strDest, isFileOp)
        'Do the initial copy
        For Each subfolder In objChildren
            subfolder.Copy strDest, True
        Next
        For Each file In objFiles
            file.Copy strDest, True
        Next
        WScript.Echo "The script is now actively backing up your files."
        WScript.Echo "Press ^C to stop."
        'MAIN BACKUP LOOP (directory mode)
        While True
            For Each subfolder In objChildren
                strDestFolder = objFSO.BuildPath(strDest, subfolder.Name)
                If Not objFSO.FolderExists(strDestFolder) Then
                    objFSO.CreateFolder(strDestFolder)
                End If
                Set objDestFolder = objFSO.GetFolder(strDestFolder)
                Call folderCompareAndCopy(subfolder, objDestFolder, strDest)
            Next
            For Each file In objFiles
                strDestFile = objFSO.BuildPath(strDest, file.Name)
                If Not objFSO.FileExists(strDestFile) Then
                    objFSO.CreateTextFile strDestFile
                End If
                Set objDestFile = objFSO.GetFile(strDestFile)
                Call compareAndCopy(file, objDestFile, strDest)
            Next
            'WScript.StdOut.Write "."
            WScript.Sleep(1000 * intInterval)
        WEnd

    ElseIf objFSO.FileExists(strSource) Then
        'File backup mode
        isFileOp = True
        Set objSource = objFSO.GetFile(strSource)
        strFilename = objSource.Name
        strDestFile = objFSO.BuildPath(strDest, strFilename)
        'Check for a newer file in the destination
        strNewFileList = compareDateModified (strSource, strDestFile, strNewFileList)
        If Not strNewFileList = "" Then
            'Destination file is newer than the source
            WScript.Echo strHeader
            WScript.Echo strNewFileList
            WScript.Echo "The above files are newer at the destination then at the source."
            WScript.Echo "You will lose any changes you have made to the destination files"
            WScript.Echo "if you choose to continue."
            WScript.Echo ""
            WScript.StdOut.Write "Would you like to continue anyway? [y/n] > "
            strAnswer = ynAnswer()
            If strAnswer = "n" Then
                WScript.Quit 0
            End If
        End If
        'Put a trailing \ on the destination path if it's missing
        strDest = fixFolderStr(strDest)
        'Confirm the operation
        Call confirmOp(strSource, strDest, isFileOp)
        'Do the initial copy
        objSource.Copy strDest, True
        Set objDestFile = objFSO.GetFile(strDestFile)
        WScript.Echo "The script is now actively backing up your files."
        WScript.Echo "Press ^C to stop."
        'MAIN BACKUP LOOP (file mode)
        While True
            Call compareAndCopy(objSource, objDestFile, strDest)
            'WScript.StdOut.Write "."
            WScript.Sleep(1000 * intInterval)
        WEnd
    End If
Else
    WScript.Echo "The destination directory does not exist or is not a directory."
    WScript.Echo strDest
    WScript.Quit 1
End If