Switch on (enable) global hyphenation in Index: in the first line and in \texttt

Question

hyphenation{} does not work in Index in the first line and in \texttt.

How can I switch it on?

How can we prevent new column when the hyphenation is switched on?

Only Index settings of hyphenation are preferable.

The problem is discussed on the base of the following MWE:

Remove (delete) unexpected new line when the word in index is long (hyphenation)

\documentclass{memoir}
\usepackage{imakeidx}
\usepackage{blindtext}
\makeindex[program=makeindex,
options=-s myindex.ist,
title={First},
name=first]


%https://tex.stackexchange.com/a/392783/44348
\usepackage{tempora} %TemporaLGCUni of Times type
\usepackage{newtxmath} %math font of Times type
% need to set the monospace=typewritter font
%https://tex.stackexchange.com/questions/213835/using-many-typewriter-fonts-in-a-single-document
\makeatletter %load fonts for cmtt
\providecommand{\EC@ttfamily}[5]{%
    \DeclareFontShape{#1}{#2}{#3}{#4}{
        <-8.5>#50800
        <8.5-9.5>#50900
        <9.5-10.5>#51000
        <10.5-11.5>#51095
        <11.5-13>#51200
        <13-15.5>#51440
        <15.5-18.5>#51728
        <18.5-22>#52074
        <22-27>#52488
        <27-32>#52986
        <32->#53583}{}}
\DeclareFontFamily{T2A}{cmtt}{\hyphenchar\font\m@ne}
\EC@ttfamily{T2A}{cmtt}{m}{n}{latt}
\EC@ttfamily{T2A}{cmtt}{m}{sl}{last}
\EC@ttfamily{T2A}{cmtt}{m}{it}{lait}
\EC@ttfamily{T2A}{cmtt}{m}{sc}{latc}
\DeclareFontShape{T2A}{cmtt}{bx}{n}%
{<->ssub*cmtt/m/n}{}
\DeclareFontShape{T2A}{cmtt}{bx}{it}%
{<->ssub*cmtt/m/it}{}
\makeatletter
\renewcommand{\ttdefault}{cmtt}


%       https://tex.stackexchange.com/a/132415/44348
\makeatletter
% we don't want a page break before a subitem
\renewcommand\subitem{\@idxitem\nobreak\hspace*{20\p@}}
\makeatother


%does not work 
%\hyphenation{foofoofoo-foofoofoo-foofoofoo-foofoofoofoofo-ofoofoofoo-foo}
\hyphenation{barbarbar-barbarbarbar-barbarbarbarbarbar-barbarbarbarbar}
\hyphenation{Diag-nos-tic-Tests-Sca-ling-And-In-fer-ring}




\begin{document}
Einstein\index[first]{Einstein\-EinsteinEinstein\-Einstein\-Einstein!NewLine}
Heisenberg\index[first]{Heisenberg} % Person index

\blindtext


barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar
\blindtext[4]



Einstein\index[first]{Einstein\-EinsteinEinstein\-Einstein\-Einstein!NewLine}
\index[first]{foofoofoofoo\-foofoofoofoofoofoo\-foofoofoofoofoo\-foofoofoo}

\index[first]{barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar}

%       \index[first]{algorithm!barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar}

%\index[first]{barbarbar\-barbarbarbar\-barbarbarbarbarbar\-barbarbarbarbar}
\index[first]{algorithm!\texttt{DiagnosticTestsScalingAndInferring}} 

\blindtext


\printindex[first] 

\end{document}

PDF

UDT

Additional question "How to force word Newline after Einstein not to go to the next column?" can be solved using this answer https://tex.stackexchange.com/a/132415/44348

However with these commands "last" Einstein go to the new line.

Answer 1

In order to hyphenate monospaced text, load the fonts without \hyphenchar\font=-1; in order to allow hyphenation in the first word, modify \@idxitem adding \hspace{0pt}\ignorespaces at the end.

\documentclass{memoir}
\usepackage[T2A,T1]{fontenc}
\usepackage{imakeidx}
\usepackage{blindtext}
\makeindex[program=makeindex,
%options=-s myindex.ist,
title={First},
name=first]


%https://tex.stackexchange.com/a/392783/44348
\usepackage{tempora} %TemporaLGCUni of Times type
\usepackage{newtxmath} %math font of Times type
% need to set the monospace=typewritter font
%https://tex.stackexchange.com/questions/213835/using-many-typewriter-fonts-in-a-single-document
\makeatletter %load fonts for cmtt
\providecommand{\EC@ttfamily}[5]{%
    \DeclareFontShape{#1}{#2}{#3}{#4}{
        <-8.5>#50800
        <8.5-9.5>#50900
        <9.5-10.5>#51000
        <10.5-11.5>#51095
        <11.5-13>#51200
        <13-15.5>#51440
        <15.5-18.5>#51728
        <18.5-22>#52074
        <22-27>#52488
        <27-32>#52986
        <32->#53583}{}}
\DeclareFontFamily{T1}{cmtt}{}
\DeclareFontFamily{T2A}{cmtt}{}
\EC@ttfamily{T1}{cmtt}{m}{n}{ectt}
\EC@ttfamily{T1}{cmtt}{m}{sl}{ecst}
\EC@ttfamily{T1}{cmtt}{m}{it}{ecit}
\EC@ttfamily{T1}{cmtt}{m}{sc}{ectc}
\DeclareFontShape{T1}{cmtt}{bx}{n}%
  {<->ssub*cmtt/m/n}{}
\DeclareFontShape{T1}{cmtt}{bx}{it}%
  {<->ssub*cmtt/m/it}{}
\EC@ttfamily{T2A}{cmtt}{m}{n}{latt}
\EC@ttfamily{T2A}{cmtt}{m}{sl}{last}
\EC@ttfamily{T2A}{cmtt}{m}{it}{lait}
\EC@ttfamily{T2A}{cmtt}{m}{sc}{latc}
\DeclareFontShape{T2A}{cmtt}{bx}{n}%
{<->ssub*cmtt/m/n}{}
\DeclareFontShape{T2A}{cmtt}{bx}{it}%
{<->ssub*cmtt/m/it}{}
\makeatletter
\renewcommand{\ttdefault}{cmtt}


%       https://tex.stackexchange.com/a/132415/44348
\makeatletter
% we want hyphenation also in the first word
\renewcommand{\@idxitem}{\par\hangindent40\p@\hspace{0pt}\ignorespaces}
% we don't want a page break before a subitem
\renewcommand\subitem{\@idxitem\nobreak\hspace*{20\p@}}
\makeatother


%does not work 
%\hyphenation{foofoofoo-foofoofoo-foofoofoo-foofoofoofoofo-ofoofoofoo-foo}
\hyphenation{barbarbar-barbarbarbar-barbarbarbarbarbar-barbarbarbarbar}
\hyphenation{Diag-nos-tic-Tests-Sca-ling-And-In-fer-ring}




\begin{document}
Einstein\index[first]{Einstein\-EinsteinEinstein\-Einstein\-Einstein!NewLine}
Heisenberg\index[first]{Heisenberg} % Person index

\blindtext


barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar
\blindtext[4]



Einstein\index[first]{Einstein\-EinsteinEinstein\-Einstein\-Einstein!NewLine}
\index[first]{foofoofoofoo\-foofoofoofoofoofoo\-foofoofoofoofoo\-foofoofoo}

\index[first]{barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar}

%       \index[first]{algorithm!barbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbarbar}

%\index[first]{barbarbar\-barbarbarbar\-barbarbarbarbarbar\-barbarbarbarbar}
\index[first]{algorithm!\texttt{DiagnosticTestsScalingAndInferring}} 

\blindtext


\printindex[first] 

\end{document}