how do I export all sheets from a spreadsheet ?

edit

The solution is to iterate through the available sheets, making each active in sequence, and for each execute the storeToURL method while applying the filter "Text - txt - csv (StarCalc)". The following code example does this. Edit the file path to conform to your own situation:

REM  *****  BASIC  *****

Sub convertSheetsToCSVs
Dim fileProps(0) as new com.sun.star.beans.PropertyValue
sheets = ThisComponent.Sheets

fileProps(0).Name = "FilterName"
fileProps(0).Value = "Text - txt - csv (StarCalc)"

i = 0

Do While sheets.Count > i
  sheet = sheets.getByIndex(i)
  cntrllr = ThisComponent.CurrentController
  cntrllr.setActiveSheet(sheet)
  sURL = "file:///home/doug/Documents/test_macro" & sheets.ElementNames(i) & ".csv"
  ThisComponent.storeToURL(sURL, fileProps())
  i = i + 1
Loop
End Sub

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In @doug 's answer, be sure to set a location in your machine. To save output in your Documents folder:

sURL= "file:///home/your-machine-name/Documents/" & sheets.ElementNames(i) & ".csv"