%% biblatex-abs-annote.sty
%% A biblatex supplement for annotated bibliographies with abstracts and annotations.
%% Works on top of any biblatex style by patching bibliography drivers.
%%
%% Copyright (C) 2026 Cameron Wimpy <cwimpy@astate.edu>
%%
%% This work may be distributed and/or modified under the conditions of
%% the LaTeX Project Public License, either version 1.3c of this license
%% or (at your option) any later version. The latest version of this
%% license is in https://www.latex-project.org/lppl.txt and version 1.3c
%% or later is part of all distributions of LaTeX version 2008-05-04 or
%% later.
%%
%% This work has the LPPL maintenance status "maintained".
%% The Current Maintainer of this work is Cameron Wimpy.
%%
%% This work consists of the files biblatex-abs-annote.sty,
%% biblatex-abs-annote.tex, biblatex-abs-annote.pdf, and README.md.
%%
%% Usage:
%%   \usepackage[style=authoryear]{biblatex}
%%   \usepackage{biblatex-abs-annote}
%%
%% Options:
%%   abstract=true|false    (default: true)  — show abstract blocks
%%   annotation=true|false  (default: true)  — show annotation blocks
%%   labels=true|false      (default: true)  — show "Abstract:"/"Annotation:" headers
%%
\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{biblatex-abs-annote}[2026/04/19 v0.1.1 Annotated bibliography with abstracts and annotations]

%% Dependencies
\RequirePackage{xpatch}
\RequirePackage{changepage}

%% ----- Package options via kvoptions -----
\RequirePackage{kvoptions}
\SetupKeyvalOptions{family=aban,prefix=aban@}
\DeclareBoolOption[true]{abstract}
\DeclareBoolOption[true]{annotation}
\DeclareBoolOption[true]{labels}
\ProcessKeyvalOptions*

%% ----- User-customizable commands -----

% Labels
\newcommand{\abAnnotateAbstractLabel}{Abstract}
\newcommand{\abAnnotateAnnotationLabel}{Annotation}

% Fonts
\newcommand{\abAnnotateAbstractFont}{\small\itshape}
\newcommand{\abAnnotateAnnotationFont}{\small}

% Label font
\newcommand{\abAnnotateLabelFont}{\small\bfseries}

% Indentation (left margin for the block)
\newlength{\abAnnotateAbstractIndent}
\setlength{\abAnnotateAbstractIndent}{1.5em}

\newlength{\abAnnotateAnnotationIndent}
\setlength{\abAnnotateAnnotationIndent}{1.5em}

% Vertical skip before each block
\newlength{\abAnnotateBlockSkip}
\setlength{\abAnnotateBlockSkip}{0.5ex}

% Vertical skip between abstract and annotation when both present
\newlength{\abAnnotateInterSkip}
\setlength{\abAnnotateInterSkip}{0.3ex}

%% ----- Bibmacros -----

\newbibmacro{ab-annotate/abstract}{%
  \ifaban@abstract
    \iffieldundef{abstract}{}{%
      \par\vskip\abAnnotateBlockSkip
      \begin{adjustwidth}{\abAnnotateAbstractIndent}{0pt}%
        \noindent
        \ifaban@labels
          {\abAnnotateLabelFont\abAnnotateAbstractLabel:\space}%
        \fi
        {\abAnnotateAbstractFont\printfield{abstract}}%
      \end{adjustwidth}%
    }%
  \fi
}

\newbibmacro{ab-annotate/annotation}{%
  \ifaban@annotation
    \iffieldundef{annotation}{}{%
      \par\vskip\abAnnotateInterSkip
      \begin{adjustwidth}{\abAnnotateAnnotationIndent}{0pt}%
        \noindent
        \ifaban@labels
          {\abAnnotateLabelFont\abAnnotateAnnotationLabel:\space}%
        \fi
        {\abAnnotateAnnotationFont\printfield{annotation}}%
      \end{adjustwidth}%
    }%
  \fi
}

%% ----- Patch bibliography drivers -----
%% We patch each driver to insert our macros before finentry.
%% If a driver doesn't exist in the loaded style, xpatch silently fails.

\newcommand{\abAnnotatePatchDriver}[1]{%
  \xpatchbibdriver{#1}%
    {\usebibmacro{finentry}}%
    {\usebibmacro{ab-annotate/abstract}%
     \usebibmacro{ab-annotate/annotation}%
     \usebibmacro{finentry}}%
    {}%
    {}% silent failure
}

% Patch all standard drivers
\abAnnotatePatchDriver{article}
\abAnnotatePatchDriver{book}
\abAnnotatePatchDriver{booklet}
\abAnnotatePatchDriver{collection}
\abAnnotatePatchDriver{inbook}
\abAnnotatePatchDriver{incollection}
\abAnnotatePatchDriver{inproceedings}
\abAnnotatePatchDriver{manual}
\abAnnotatePatchDriver{misc}
\abAnnotatePatchDriver{online}
\abAnnotatePatchDriver{patent}
\abAnnotatePatchDriver{periodical}
\abAnnotatePatchDriver{proceedings}
\abAnnotatePatchDriver{report}
\abAnnotatePatchDriver{thesis}
\abAnnotatePatchDriver{unpublished}

\endinput