Introduction
I am sorry for the long MWE, but I was not able to make it shorter and still illustrate my problem. Again I am working on streamlining the creation of exams for my university. In the example below the user can add more lectures using
\defineInfo{jane}{
name=Jane Doe,
phone=75123123,
}
(Where I got help creating the syntax in Contact list as dictionary) Add information about the exam using
\FrontpageUiTsetup{
contact = jane,
}
(Now with the help from Labeled input parameters) Where the last command of course has a lot more parameters, irrelevant to my question. Now, I want to combine these two answers, so I can refer to a lecturer using an ID, and then print the relevant parts in \FrontpageUiT.
I first tried writing
\ifx\@contact\@empty\else
\contactname & \contactInfo{\@contact}{name}\\%
\fi
However, it seems the \contactInfo command expands before \@contact so it outputs nothing. After a bit of googling I was able to use the following to expand \@contact first
\newcommand{\expandMacro}[1]{
\begingroup\edef\x{\endgroup
\noexpand#1%
}\x
}
Problem
So here comes my problem:
- I want the default value of @phone and @mobile to be defined by respectively the lines
\contactInfo{\@contact}{mobile}and\contactInfo{\@contact}{phone}
The problem comes when I want the line
\contactmobile & \@mobile
To be blank when no mobile number is given. Example:
mobile .tl_set:N = \@mobile,
mobile .initial:n = {\expandMacro{\contactInfo{\@contact}{mobile}}},
phone .tl_set:N = \@phone,
phone .initial:n = {\expandMacro{\contactInfo{\@contact}{phone}}},
.
.
.
\ifx\@contact\@empty\else
\contactname & \expandMacro{\contactInfo{\@contact}{name}}\\%
\fi
\ifx\@mobile\@empty\else
\contactmobile & \@mobile\\%
\fi
\ifx\@phone\@empty\else
\contactphone & \@phone\\%
.
.
.
\defineInfo{jane}{
name=Jane Doe,
phone=75123123,
}
\FrontpageUiTsetup{
contact = jane,
}
\begin{document}
\FrontpageUiT
\end{document}
As Jane has no mobile number, I would expect the output to be
Contact Jane Doe
Phone 75 12 31 23
Instead I am faced with
Contact Jane Doe
Mobile
Phone 75 12 31 23
The problem is that the code can not expand \contactInfo{\@contact}{mobile} fast enough to realize that it is empty. After a bit more googling I found
\newcommand{\IfNoText}[3]{%
\sbox0{#1}%
\ifdim\wd0=0pt %
{#2}% if #1 is empty
\else%
\ifdim0pt=\dimexpr\ht0+\dp0\relax
{#2}% if #1 is empty
\else
{#3}% if #1 is not empty
\fi
\fi%
}
That can detect if the output is blank. However, it does not support ampersand (&), so I can not use it in my table. E.G
\IfNoText{\@mobile}{}{Mobile & \@mobile \\}
throws me an error. I tried also to use \IfNoText earlier in my document to define toggles that expand to true or false based on the contents of \@mobile. However, these did not expand fast enough either.
- Is there a way to check that
\@mobileand@phoneis empty faster, when they are given in the terms of\contactInfo?
Code
\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage{xparse}
\usepackage{xfp}
\newcommand{\IfNoText}[3]{%
\sbox0{#1}%
\ifdim\wd0=0pt %
{#2}% if #1 is empty
\else%
\ifdim0pt=\dimexpr\ht0+\dp0\relax
{#2}% if #1 is empty
\else
{#3}% if #1 is not empty
\fi
\fi%
}
\newcommand{\expandMacro}[1]{
\begingroup\edef\x{\endgroup
\noexpand#1%
}\x
}
\ExplSyntaxOn
\NewDocumentCommand{\defineInfo}{mm}
{
\prop_new:c { \__nebu_contact_prop:n { #1 } }
\prop_gset_from_keyval:cn { \__nebu_contact_prop:n { #1 } } { #2 }
}
\NewDocumentCommand{\contactInfo}{mm}
{
\str_case:nnF { #2 }
{
{phone} { \nebu_phone:e { \prop_item:cn { \__nebu_contact_prop:n { #1 } } { #2 } } }
{mobile} { \nebu_phone:e { \prop_item:cn { \__nebu_contact_prop:n { #1 } } { #2 } } }
}
{ \prop_item:cn { \__nebu_contact_prop:n { #1 } } { #2 } }
}
% syntactic sugar
\cs_new:Nn \__nebu_contact_prop:n
{
g_nebu_contact_\str_lower_case:n { #1 }_prop
}
%%% formatting phone numbers
\NewDocumentCommand{\phone}{m}
{
\nebu_phone:n { #1 }
}
\tl_new:N \l__nebu_phone_tl
\cs_new_protected:Nn \nebu_phone:n
{
\tl_set:Nn \l__nebu_phone_tl { #1 }
\tl_remove_all:Nn \l__nebu_phone_tl { ~ }
\int_compare:nTF { \tl_count:N \l__nebu_phone_tl = 8 }
{
\__nebu_phone_eight:V \l__nebu_phone_tl
}
{
\tl_use:N \l__nebu_phone_tl
}
}
\cs_generate_variant:Nn \nebu_phone:n { e }
\cs_new:Nn \__nebu_phone_eight:n
{
\str_case_e:nnF { \tl_head:n { #1 } }
{
{4}{ \__nebu_phone_iii_ii_iii:nnnnnnnn #1 }
{8}{ \__nebu_phone_iii_ii_iii:nnnnnnnn #1 }
{9}{ \__nebu_phone_iii_ii_iii:nnnnnnnn #1 }
}
{
\__nebu_phone_ii:nnnnnnnn #1
}
}
\cs_generate_variant:Nn \__nebu_phone_eight:n { V }
\cs_new:Nn \__nebu_phone_iii_ii_iii:nnnnnnnn { #1#2#3\hspace{1ex}#4#5\hspace{1ex}#6#7#8 }
\cs_new:Nn \__nebu_phone_ii:nnnnnnnn { #1#2\hspace{0.6666ex}#3#4\hspace{0.6666ex}#5#6\hspace{0.6666ex}#7#8 }
\ExplSyntaxOff
% https://tex.stackexchange.com/a/504129/8306
%
% This creates the backbone for the frontpage. One can add new keys here
\makeatletter
% Provide commands.
\ExplSyntaxOn
% Provide keys.
\keys_define:nn { babylonia }
{
contact .tl_set:N = \@contact,
mobile .tl_set:N = \@mobile,
mobile .initial:n = {\expandMacro{\contactInfo{\@contact}{mobile}}},
phone .tl_set:N = \@phone,
phone .initial:n = {\expandMacro{\contactInfo{\@contact}{phone}}},
}
% Provide key setting command.
\NewDocumentCommand\FrontpageUiTsetup{ m }{
\keys_set:nn { babylonia } { #1 }
}
\ExplSyntaxOff
% Provide names.
\newcommand*\contactname{Contact}
\newcommand*\contactmobile{Mobile}
\newcommand*\contactphone{Phone}
% The typesetting command.
\newcommand\FrontpageUiT{%
\noindent
\begin{tabular}{p{0.2\textwidth} p{\dimexpr 0.8\textwidth - 4\tabcolsep}}
\ifx\@contact\@empty\else
\contactname & \expandMacro{\contactInfo{\@contact}{name}}\\%
\fi
\ifx\@mobile\@empty\else
\contactmobile & \@mobile\\%
\fi
\ifx\@phone\@empty\else
\contactphone & \@phone\\%
\fi
\end{tabular}%
}
\makeatother
% ==============================================================================
% User interface below here
% ==============================================================================
% This adds contacts to be used in the UiT frontpage
% Example:
%
% \defineInfo{joe}{
% name=Joe Doe, mobile=32132132, phone=93123123,
% }
\defineInfo{jane}{
name=Jane Doe,
phone=75123123,
}
\FrontpageUiTsetup{
contact = jane,
}
\begin{document}
\FrontpageUiT
\end{document}
