How can I create an Index of a pdf generated as below?

Question

I have a pdf generated as below. Now I would like to create the index which should be a page listing all the names of papers included, i.e. the names of sections, one row should be dedicated for each paper from the entire pdf. How could I achieve this ? Preferably in XeTeX.

\documentclass[landscape,a4paper]{article}
\usepackage{pdfpages}
\usepackage{pgfmath}
%\usepackage[margin=1cm,showframe]{geometry}% MWE only
\pgfmathsetmacro{\scale}{(\paperheight-2cm)/(\paperwidth-3cm)}% 1cm margin
\pgfmathsetlengthmacro{\delta}{\paperwidth-2cm-2\scale(\paperheight-3cm)-4mm}% 4mm fudge factor
\usepackage[footwidth=paper]{scrlayer-scrpage}
\pagestyle{plain}
\usepackage{polyglossia}
\usepackage{fontspec}
\setotherlanguage{hebrew}
\newfontfamily\hebrewfont{Arial}
\robustify{\thepage}
\renewcommand{\thepage}{\arabic{page} \ \roman{page}\ \texthebrew{\hebrewnumeral{\value{page}}}}
\newcommand\gettitle[1]{%
  \directlua{%
    local filename = kpse.find_file("#1", 'graphic/figure')
    doc = pdfe.open(filename)
    info = pdfe.getinfo(doc)
    title = info['Title']
    tex.print(title)
  }}
\begin{document}
%  \includepdf[scale=1.02, nup=2x1,pages=1-8,trim=2.5cm 2.5cm 5.5cm 7.0cmB]{sh1.pdf}
%pagecommand={\thispagestyle{plain}}
\includepdf[scale=\scale,noautoscale,nup=2x1,pages=1-,delta={\delta} 0pt,offset=0pt -3mm,% offset in reverse order
  trim=2.5cm 2.5cm 5.5cm 7.0cm,picturecommand={\put(.15\paperwidth,3.3cm){\thepage}}]{example-image-a4-numbered.pdf}
\includepdf[scale=\scale,noautoscale,nup=2x1,pages=1-,delta={\delta} 0pt,offset=0pt -3mm,% offset in reverse order
  trim=2.5cm 2.5cm 5.5cm 7.0cm,picturecommand={\put(.15\paperwidth,3.3cm){\thepage}}]{example-image-a4-numbered.pdf}
\includepdf[scale=\scale,noautoscale,nup=2x1,pages=1-,delta={\delta} 0pt,offset=0pt -3mm,% offset in reverse order
  trim=2.5cm 2.5cm 5.5cm 7.0cm,picturecommand={\put(.15\paperwidth,3.3cm){\thepage}}]{example-image-a4-numbered.pdf}
\end{document}

Answer 1

Consider the additions to your code example. This produces a list of documents on a separate page like the list of tables.

\documentclass[landscape,a4paper]{article}
\usepackage{pdfpages}
\usepackage{pgfmath}
%\usepackage[margin=1cm,showframe]{geometry}% MWE only
\pgfmathsetmacro{\scale}{(\paperheight-2cm)/(\paperwidth-3cm)}% 1cm margin
\pgfmathsetlengthmacro{\delta}{\paperwidth-2cm-2\scale(\paperheight-3cm)-4mm}% 4mm fudge factor
\usepackage[footwidth=paper]{scrlayer-scrpage}
\pagestyle{plain}
\usepackage{polyglossia}
\usepackage{fontspec}
\setotherlanguage{hebrew}
\newfontfamily\hebrewfont{Arial}
\robustify{\thepage}
\renewcommand{\thepage}{\arabic{page} \ \roman{page}\ \texthebrew{\hebrewnumeral{\value{page}}}}
% ======  added to the mwe code
\usepackage{xpatch}
\usepackage[titles]{tocloft}
\newlistof[section]{pdfdoc}{lop}{List of documents}
\newcommand{\pdfdoc}[1]{%
    \refstepcounter{pdfdoc}
    \addcontentsline{lop}{pdfdoc}{\protect\numberline{\thepdfdoc} \addvspace{1pt}\sffamily\small \textcolor{blue}{#1}}\par}
\xpatchcmd{\listofpdfdoc}{\chapter}{\section}{}{}
\cftsetindents{pdfdoc}{15mm}{10mm}
% ===== end of addition
\newcommand\gettitle[1]{%
    \directlua{%
    local filename = kpse.find_file("#1", 'graphic/figure')
    doc = pdfe.open(filename)
    info = pdfe.getinfo(doc)
    title = info['Title']
    tex.print(title)
    }}
\begin{document}
%  \includepdf[scale=1.02, nup=2x1,pages=1-8,trim=2.5cm 2.5cm 5.5cm 7.0cmB]{sh1.pdf}

%pagecommand={\thispagestyle{plain}}


% ===== added to print list of documents
    \listofpdfdoc
    \addcontentsline{toc}{section}{List of documents}
% =====
\includepdf[scale=\scale,noautoscale,nup=2x1,pages=1-,delta={\delta} 0pt,offset=0pt -3mm,% offset in reverse order
trim=2.5cm 2.5cm 5.5cm 7.0cm,picturecommand={\put(.15\paperwidth,3.3cm){\thepage}}]{example-image-a4-numbered.pdf}
\addcontentsline{lop}{pdfdoc}{example-image-a4-numbered - 1} % <- puts document name into list of documents


\includepdf[scale=\scale,noautoscale,nup=2x1,pages=1-,delta={\delta} 0pt,offset=0pt -3mm,% offset in reverse order
trim=2.5cm 2.5cm 5.5cm 7.0cm,picturecommand={\put(.15\paperwidth,3.3cm){\thepage}}]{example-image-a4-numbered.pdf}
\addcontentsline{lop}{pdfdoc}{example-image-a4-numbered - 2}

\includepdf[scale=\scale,noautoscale,nup=2x1,pages=1-,delta={\delta} 0pt,offset=0pt -3mm,% offset in reverse order
trim=2.5cm 2.5cm 5.5cm 7.0cm,picturecommand={\put(.15\paperwidth,3.3cm){\thepage}}]{example-image-a4-numbered.pdf}
\addcontentsline{lop}{pdfdoc}{example-image-a4-numbered - 3} \phantom{end} % <- needed to add the last entry to the list of documents


\end{document}

Note the addition of \phantom{end} to the last entry. Somehow that is needed to get the last entry into the list in your code. In my own document using the code to get a list of included documents that was not needed.