' this code extracts text from PPT(X) and saves to latex beamer body
' Provided for free with no guarantees or promises
'WARNING: this will overwrite files in the powerpoint file's folder if there are name collisiona
' Original version by Louis from StackExchange (https://tex.stackexchange.com/users/6321/louis) available here: (https://tex.stackexchange.com/questions/66007/any-way-of-converting-ppt-or-odf-to-beamer-or-org)
' Modified by Jason Kerwin (www.jasonkerwin.com) on 20 February 2018:
    ' Takes out extra text that printed in the title line
    ' Switches titles to \frametitle{} instead of including them on the \begin{frame} line (sometimes helps with compiling)
    ' Changes the image names to remove original filename, which might have spaces
    ' Removes "\subsection{}" which was printing before each slide
'NB you must convert your slides to .ppt format before running this code

Public Sub ConvertToBeamer()
    Dim objPresentation As Presentation
    Set objPresentation = Application.ActivePresentation

    Dim objSlide As Slide
    Dim objshape As Shape
    Dim objShape4Note As Shape
    Dim hght As Long, wdth As Long
    Dim objFileSystem
    Dim objTextFile
    Dim objGrpItem As Shape

    Dim Name As String, Pth As String, Dest As String, IName As String, ln As String, ttl As String, BaseName As String
    Dim txt As String
    Dim p As Integer, l As Integer, ctr As Integer, i As Integer, j As Integer
    Dim il As Long, cl As Long
    Dim Pgh As TextRange

    Name = Application.ActivePresentation.Name
    p = InStr(Name, ".ppt")
    l = Len(Name)
    If p + 3 = l Then
      Mid(Name, p) = ".txt"
    Else
      Name = Name & ".txt"
    End If
    BaseName = Left(Name, l - 4)
    Pth = Application.ActivePresentation.Path
    Dest = Pth & "\" & Name
    ctr = 0
    Set objFileSystem = CreateObject("Scripting.FileSystemObject")

    Set objTextFile = objFileSystem.CreateTextFile(Dest, True, True)
    objTextFile.WriteLine "\section{" & Name & "}"
    With Application.ActivePresentation.PageSetup
        wdth = .SlideWidth
        hght = .SlideHeight
    End With


    For Each objSlide In objPresentation.Slides
        objTextFile.WriteLine ""
        ttl = "No Title"
        If objSlide.Shapes.HasTitle Then
          ttl = objSlide.Shapes.Title.TextFrame.TextRange.Text
        End If
        ' objTextFile.WriteLine "\subsection{" & ttl & "}"
        objTextFile.WriteLine "\begin{frame}"
        objTextFile.WriteLine "\frametitle{" & ttl & "}"
       
        For Each objshape In objSlide.Shapes

            If objshape.HasTextFrame = True Then
                If Not objshape.TextFrame.TextRange Is Nothing Then
                    il = 0
                    For Each Pgh In objshape.TextFrame.TextRange.Paragraphs

                        If Not objshape.TextFrame.TextRange.Text = ttl Then
                            cl = Pgh.Paragraphs.IndentLevel
                            txt = Pgh.TrimText
                            txt = Replace(txt, "&", "\&")
                            If cl > il Then
                               objTextFile.WriteLine "\begin{itemize}"
                                il = cl
                            ElseIf cl < il Then
                                objTextFile.WriteLine "\end{itemize}"
                                il = cl
                            End If
                            If il = 0 Then
                                objTextFile.WriteLine txt
                            Else
                                objTextFile.WriteLine "\item " + txt
                            End If
                        End If
                    Next Pgh
                    If il > 0 Then
                      For i = 1 To il
                        objTextFile.WriteLine "\end{itemize}"
                      Next i
                    End If
                End If
            ElseIf objshape.HasTable Then
              ln = "\begin{tabular}{|"
              For j = 1 To objshape.Table.Columns.Count
              ln = ln & "l|"
              Next j
              ln = ln & "} \hline"
              objTextFile.WriteLine ln
              With objshape.Table
                For i = 1 To .Rows.Count
                    If .Cell(i, 1).Shape.HasTextFrame Then
                        ln = .Cell(i, 1).Shape.TextFrame.TextRange.Text
                    End If

                    For j = 2 To .Columns.Count
                        If .Cell(i, j).Shape.HasTextFrame Then
                            ln = ln & " & " & .Cell(i, j).Shape.TextFrame.TextRange.Text
                        End If
                    Next j
                    ln = ln & "  \\ \hline"
                    objTextFile.WriteLine ln
                Next i
                objTextFile.WriteLine "\end{tabular}" & vbCrLf
              End With
            ElseIf (objshape.Type = msoGroup) Then
                For Each objGrpItem In objshape.GroupItems
                    If objGrpItem.HasTextFrame = True Then
                        If Not objGrpItem.TextFrame.TextRange Is Nothing Then
                           shpx = objGrpItem.Top / hght
                           shpy = objGrpItem.Left / wdth
                           ' this could need adjustment (Footers textblocks)
                           If shpx < 0.1 And shpy > 0.5 Then
                            objTextFile.WriteLine ("%BookTitle: " & objGrpItem.TextFrame.TextRange.Text)
                            ElseIf shpx < 0.1 And shpy < 0.5 Then
                            objTextFile.WriteLine ("%FrameTitle: " & objGrpItem.TextFrame.TextRange.Text)
                            Else
                            objTextFile.WriteLine ("%PartTitle: " & objGrpItem.TextFrame.TextRange.Text)
                           End If
                        End If
                    End If
                 Next objGrpItem
            ElseIf (objshape.Type = msoPicture) Then
                IName = "img" & Format(ctr, "0000") & ".png"
                objTextFile.WriteLine "\includegraphics{" & IName & "}"
                Call objshape.Export(Pth & "\" & IName, ppShapeFormatPNG, , , ppRelativeToSlide)
                ctr = ctr + 1
            ElseIf objshape.Type = msoEmbeddedOLEObject Then
                If objshape.OLEFormat.ProgID = "Equation.3" Then
                    IName = "img" & Format(ctr, "0000") & ".png"
                    objTextFile.WriteLine "\includegraphic{" & IName & "}"
                    Call objshape.Export(Pth & "\" & IName, ppShapeFormatPNG, , , ppRelativeToSlide)
                    ctr = ctr + 1
                End If
            End If
        Next objshape


        objTextFile.WriteLine vbCrLf & "\end{frame}" & vbCrLf
        'to test on the first 3 slides
        'If objSlide.SlideIndex >= 3 Then
        '    Exit For
        'End If
    Next objSlide

    objTextFile.Close
    Set objTextFile = Nothing
    Set objFileSystem = Nothing
End Sub