Cfrgtkky

I would like to create a list of references ordered from the most recent to the oldest.

The MWE bellow gives a basic solution:

documentclass{article}

usepackage[style=authoryear,sorting=ydnt]{biblatex}

usepackage{filecontents}



begin{filecontents}{jobname.bib}

@book{Rabelais1532,

  author = {Rabelais, Franc{c}ois},

  date = {1532},

  title = {Pantagruel},

  keywords = {1532},

}

@book{Hugo1862,

  author = {Hugo, Victor},

  date = {1862},

  title = {Les Mis'{e}rables},

  keywords = {1862},

}

@book{Hugo1831,

  author = {Hugo, Victor},

  date = {1831},

  title = {Notre-Dame de Paris},

  keywords = {1831},

}

@book{Zola1885,

  author = {Zola, '{E}mile},

  date = {1885},

  title = {Germinal},

  keywords = {1885},

}

@book{Balzac1831,

  author = {de Balzac, Honor'{e}},

  date = {1831},

  title = {The Skin of Sorrow},

  keywords = {1831},

}

end{filecontents}



addbibresource{jobname.bib}



begin{document}

nocite{*}

printbibliography[title=References (default)]

end{document}

However I would like to create some parts in the list, each part corresponding to a year, something like this:

printbibliography[keyword=1885, title=1885]

printbibliography[keyword=1862, title=1862]

printbibliography[keyword=1831, title=1831]

printbibliography[keyword=1532, title=1532]

I have tried to define filters in the preamble, modified from the biblatex documentation (§3.7.9, p. 89):

defbibfilter{1885}{%

    date=1885

}%

and to add the following code:

printbibliography[filter=1885, title=1885]

but the log file indicates:

Package biblatex Error: Invalid filter expression.

Package biblatex Error: Filter '1885' not found.

Is it possible, using filter commands for example, to automate the process with references ordered by year decreasing?

I assume it would be nicer if the year lists would be generated automatically, so you don't have to write printbibliography[keyword=1885, title=1885] etc.

The problem with your filter was that date=1885 is not a valid filter expression. A filter can only have (not)type, (not)subtype, (not)keyword and (not)field (pure existence) expressions. For more complicated beasts you need a bibcheck. Indeed, this is what we use below. The bibcheck thisyear checks if an entry dates to a certain year.

Here I'm using LaTeX3 code to sort the list of all years easily.

documentclass{article}

usepackage[style=authoryear,sorting=ydnt]{biblatex}



usepackage{xparse}



ExplSyntaxOn

seq_new:N g__blxbibbyyear_yearlist_seq



cs_new:Npn __blxbibbyyear_seq_gput_right_once:Nn #1 #2

  {

    seq_if_in:NnF #1 {#2}

      { seq_gput_right:Nn #1 {#2} }

  }



cs_generate_variant:Nn __blxbibbyyear_seq_gput_right_once:Nn { NV, Nx }





prg_new_conditional:Nnn blx_field_if_undef:n { p, T, F , TF }

  {

    use:c { iffieldundef } { #1 } { prg_return_true: } { prg_return_false: }

  }



% unfortunately, iffieldint is not expandable, so no p version for us, boo

prg_new_protected_conditional:Nnn blx_field_if_int:n { T, F , TF }

  {

    iffieldint { #1 } { prg_return_true: } { prg_return_false: }

  }



AtDataInput

  {

    blx_field_if_undef:nF { labeldatesource }

      { 

        blx_field_if_undef:nTF { thefield{labeldatesource}year }

          {

            blx_field_if_undef:nF { thefield{labeldatesource} }

              {

                blx_field_if_int:nT { thefield{labeldatesource} }

                  {

                    __blxbibbyyear_seq_gput_right_once:Nx g__blxbibbyyear_yearlist_seq

                      { thefield{thefield{labeldatesource}} }

                  }

              }

          }

          {

            __blxbibbyyear_seq_gput_right_once:Nx g__blxbibbyyear_yearlist_seq

              { thefield{thefield{labeldatesource}year} }

          }

      }

  }



cs_new:Npn blxbibbyyear_seq_sort_bydirection:NN #1 #2

  {

    seq_gsort:Nn #2

      {

         int_compare:nNnTF { ##1 } #1 { ##2 }

          { sort_return_swapped: }

          { sort_return_same: }

      }

  }



cs_new:Nn blxbibbyyear_seq_sort_descending:N

  {

    blxbibbyyear_seq_sort_bydirection:NN < #1

  }



cs_new_nopar:Npn blxbibbyyear_print_yearbib:nn #1 #2

  {

    defbibcheck{thisyear}

      {

        blx_field_if_int:nTF { labelyear }

          {

            int_compare:nNnF { thefield{labelyear} } = { #1 }

              { skipentry }

          }

          { skipentry }

      }

    printbibliography[heading=subbibliography, title=#1, check=thisyear, #2]

  }





DeclareDocumentCommand{printbibbyyear}{O{}}

  {

    blxbibbyyear_seq_sort_descending:N g__blxbibbyyear_yearlist_seq

    seq_map_inline:Nn g__blxbibbyyear_yearlist_seq

      { blxbibbyyear_print_yearbib:nn {##1} {#1} }

  }

ExplSyntaxOff



usepackage{filecontents}

begin{filecontents}{jobname.bib}

@book{Rabelais1532,

  author = {Rabelais, Franc{c}ois},

  date = {1532},

  title = {Pantagruel},

}

@book{Hugo1862,

  author = {Hugo, Victor},

  date = {1862},

  title = {Les Mis'{e}rables},

}

@book{Hugo1831,

  author = {Hugo, Victor},

  date = {1831},

  title = {Notre-Dame de Paris},

}

@book{Zola1885,

  author = {Zola, '{E}mile},

  date = {1885},

  title = {Germinal},

}

@book{Balzac1831,

  author = {de Balzac, Honor'{e}},

  year = {1831},

  title = {The Skin of Sorrow},

}

end{filecontents}

addbibresource{jobname.bib}



begin{document}

nocite{*}

printbibheading

printbibbyyear

end{document}