Conversion to pdf
=================

text/plain
text/csv
application/vnd.oasis.opendocument.text
application/msword
application/vnd.wordperfect
application/rtf
  unoconv -d document -f pdf --stdout -v '%f' > '%o'

image/png
image/jpg
image/jpeg
  convert -f pdf -density 300 '%f' '%o'

application/vnd.ms-powerpoint
application/vnd.openxmlformats-officedocument.presentationml.presentation
  unoconv -d presentation -f pdf --stdout -v '%f' > '%o'

application/vnd.ms-excel
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
  unoconv -d spreadsheet -f pdf --stdout -v '%f' > '%o'

Preview
========

image/jpg
image/jpeg
image/png
  convert -resize %wx '%f' '%o'

application/pdf
  gs -dBATCH -dNOPAUSE -sDEVICE=png16m -dPDFFitPage -r72x72 -sOutputFile=- -dFirstPage=1 -dLastPage=1 -q '%f' | convert -resize %wx png:- '%o'

text/plain
  a2ps -1 -a1 -R -B -o - '%f' | gs -dBATCH -dNOPAUSE -sDEVICE=png16m -dFirstPage=1 -dLastPage=1 -dPDFFitPage -r72x72 -sOutputFile=- -q - | convert -resize %wx png:- '%o'

application/msword
application/vnd.oasis.opendocument.spreadsheet
application/vnd.oasis.opendocument.text
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
application/vnd.ms-excel
application/vnd.openxmlformats-officedocument.wordprocessingml.document
application/rtf
application/vnd.ms-powerpoint
text/csv
application/vnd.wordperfect
  /usr/bin/unoconv -d document -e PageRange=1 -f pdf --stdout -v '%f' | gs -dBATCH -dNOPAUSE -sDEVICE=pngalpha -dPDFFitPage -r72x72 -sOutputFile=- -dFirstPage=1 -dLastPage=1 -q - | convert -resize %wx png:- '%o'