\hline does not produce anything

Question

I am trying to create a simple table with visible lines and columns separators (horizontal and vertical lines).

The LaTeX code seems straightforward. To draw horizontal lines, you should insert the command "\hline". That's what I do. However, the lines are not visible. Please note that there are no warnings during the execution of LuaLatex (see the annexe for the versions).

The LaTeX code is very simple :

\documentclass{cv}

\begin{document}

   \begin{tabular}{c|c|c|c}
       \hline
       PHP5/7   & Expert & 20 ans & 100\% \\
       \hline
       PHP5/7   & Expert & 20 ans & 100\% \\
   \end{tabular}%

\end{document}

I also give you the code for the class "cv" : see the annexe.

I spent a day searching on the Internet... but I can't find any reason why the lines are not visible.

Any idea ?

Best regards,

Denis

ANNEXE

Versions

• I use TexLive version 6.2.1 (tex -x) on Ubuntu 16.04.4 LTS.
• I use LuaLatex (version beta-0.80.0) to produce the PDF document.

The class "cv"

% This file contains LaTeX configuration for all CV.

\NeedsTeXFormat{LaTeX2e}
\ProvidesClass{cv}[1995/10/30 Standard LaTeX minimal class]

% [geometry] This package provides a flexible and easy interface to page dimensions.
\usepackage[a4paper,
            % We set the dimensions of the left and right margins.
            left=1cm,
            right=1cm,
            % We set the dimensions of the top and bottom margins.
            top=2cm,
            bottom=2cm]{geometry}

% We (must) redefine the font size named "normalsize" (this is mandatory).
% Please note that LaTeX defines other names for font sizes (for example: tiny, small...).
% See https://www.sharelatex.com/learn/Font_sizes,_families,_and_styles#Reference_guide
% WARNING: Make sure to redefine the command "\normalsize" before loading the package "fontspec".
\renewcommand{\normalsize}{\fontsize{10pt}{12pt}\selectfont}

% This package allows users of LuaTeX to load OpenType fonts in a LaTeX document.
% Find the names of all fonts under Ubuntu:
% find /usr/share/texmf/fonts/ -name "*.otf" | xargs -n1 fc-scan --format "%{fullname}\n" | sed 's/,.\+$//'
% See https://ctan.org/pkg/fontspec
% WARNING: This package needs the font size named "normalsize" to be defined!
\usepackage{fontspec}

% This package allows the use of formatting features that are required to draw tables.
\usepackage{array}

The command I use to generate the PDF

This is a Makefile:

# This document illustrates the use of the "make" tool to produce PDF files from LaTeX sources.
# 
#      Generate the PDF file:                     make 
#      Clean all the temporary files:             make clean
#      Clean everything (including the PDF file): make clear

LATEX_EXE     = /usr/bin/lualatex
LATEX_OPTIONS = -halt-on-error -shell-escape -interaction=nonstopmode --output-format=pdf
PDF_VIEWER    = xdg-open

perso.pdf: perso.tex cv.cls
        ${LATEX_EXE} ${LATEX_OPTIONS} $< && echo "SUCCESS" && ${PDF_VIEWER} $@

all: perso.pdf

clean:
        rm -f *.log *.out *.aux

clear: clean
        rm -f *.pdf

Answer 1

The class is too scanty and doesn't set very important parameters, among which \arrayrulewidth and \tabcolsep.

\documentclass{cv}

\setlength{\arrayrulewidth}{0.4pt}
\setlength{\tabcolsep}{6pt}

\begin{document}

   \begin{tabular}{c|c|c|c}
       \hline
       PHP5/7   & Expert & 20 ans & 100\% \\
       \hline
       PHP5/7   & Expert & 20 ans & 100\% \\
   \end{tabular}%

\end{document}

Usually classes are built upon another one, such as article, not upon minimal (this class is only for experiments, not for producing actual documents, see Why should the minimal class be avoided?).

If I add \LoadClass{article} just after the \ProvidesClass line, the output of your unmodified example is