URI: 
       Use sci-hub to fetch possible PDF - plumb - Open certain URL patterns with an ad-hoc opener (plumber)
  HTML hg clone https://bitbucket.org/iamleot/plumb
   DIR Log
   DIR Files
   DIR Refs
   DIR README
       ---
   DIR changeset ad9d22a08b9ac9c70ccccb3861c16b3a02b1cb82
   DIR parent d00746754e8c6eff8b066a1797f620147e566322
  HTML Author: Leonardo Taccari <iamleot@gmail.com>
       Date:   Thu, 13 Sep 2018 16:17:30 
       
       Use sci-hub to fetch possible PDF
       
       Diffstat:
        openers/doi |  19 +++++++++++++++++--
        1 files changed, 17 insertions(+), 2 deletions(-)
       ---
       diff -r d00746754e8c -r ad9d22a08b9a openers/doi
       --- a/openers/doi       Thu Sep 13 16:00:05 2018 +0200
       +++ b/openers/doi       Thu Sep 13 16:17:30 2018 +0200
       @@ -1,7 +1,22 @@
        #!/bin/sh
        
       +scihub_pdf()
       +{
       +       doi="$1"
       +
       +       curl -gs -L "http://sci-hub.tw/${doi}" |
       +           xmllint --html --xpath 'string(//iframe[@id="pdf"]/@src)' - 2>/dev/null |
       +           sed -e 's;^//;http://;' \
       +               -e 's/.pdf.*$/.pdf/'
       +}
       +
        for u in "$@"; do
               doi="${u#*://}"
       -       doiurl="https://doi.org/${doi}"
       -       plumb "${doiurl}"
       +       url="https://doi.org/${doi}"
       +       pdfurl=$(scihub_pdf "${doi}")
       +       if [ -n "${pdfurl}" ]; then
       +               url="${pdfurl}"
       +       fi
       +
       +       plumb "${url}"
        done