\usepackage{hyperref}
\hypersetup{hidelinks}
\usepackage{fontawesome}
\usepackage{xifthen}% provides \isempty test
\newcommand\pdfref[3]{%
  \href{phd://open-paper?id=#1&page=#2}{%
  \textup{[\textbf{\ifthenelse{\isempty{#3}}{here}{#3}}]}}%
}
\newcommand\urlref[2]{%
  \href{#1}{\raisebox{0.15ex}{\scriptsize \faLink}\:\textup{\textbf{#2}}}%
}
\newcommand\absolutefileref[2]{%
  \href{run:#1}{\raisebox{0.15ex}{\scriptsize \faFile}\:\textup{\textbf{#2}}}%
}

% this will contain the current date in yyyy-mm-dd format
\def\formatteddate{}
\newcommand\fileref[2]{
  \IfFileExists{./\formatteddate/#1}{
    \absolutefileref{./\formatteddate/#1}{#2}
  }{
    \textcolor{gray}{\absolutefileref{./\formatteddate/#1}{#2}}
  }
}
\newcommand{\xournal}{\fileref{note.xopp}{Handwritten notes}}%