Make soul and texttt work together

I was trying to redefine texttt command to make it have background color using package soul. But it seems that it is harder than I thought.

texttt

My initial code is

documentclassarticle usepackagexcolor, soul colorletmycolorred!30 sethlcolormycolor letoldtexttttexttt renewcommandtexttt[1] hloldtexttt#1 begindocument textttcan we highlight enddocument

But it won't run, the error message is:

Argument of texttt has an extra }.

I searched and found this post. The post suggests to use soulregister command. So I add the following line before begindocument:

soulregister

begindocument

soulregistertexttt1

But the error persists. I also found this post, which further suggests to use DeclareRobustCommand. Now my code is

DeclareRobustCommand

documentclassarticle usepackagexcolor, soul colorletmycolorred!30 sethlcolormycolor letoldtexttttexttt % renewcommandtexttt[1] % hloldtexttt#1 % DeclareRobustCommandtexttt[1] hloldtexttt#1 soulregistertexttt1 begindocument textttcan we highlight enddocument

But it doesn't work. The error message is

TeX capacity exceeded, sorry [grouping levels=255]

It seems like rabbit hole of issues. Can you point out what has gone wrong? How to fix this seemingly simple problem?

Edit:

I am using Pandoc to convert Markdown file to PDF. The underlying LaTeX command for Markdown inline code is texttt. But there is no background color. That is why I want to combine soul and texttt.

texttt

I have tried the solution of @egreg and @daleif. They both work for standard alone tex code.

documentclassarticle usepackagexcolor, soul colorletmycolorred!30 sethlcolormycolor letoldtexttttexttt % renewcommandtexttt[1] % ttfamilyhl#1 % DeclareRobustCommandtexttt[1]% hlttfamily#1% begindocument textttcan we highlight enddocument

But if I put it in a file head.tex and compile Markdown to PDF, there are still errors. The content of head.tex is:

head.tex

usepackagexcolor, soul colorletmycolorred!30 sethlcolormycolor letoldtexttttexttt DeclareRobustCommandtexttt[1]% hlttfamily#1%

Content of test.md is

test.md

`some inline words`

If I try to generate PDF using the new header:

pandoc -H head.tex -s test.md -o test.pdf

there occurs another error:

Package soul Error: Reconstruction failed.

2 Answers
2

The soul macros are rather special, it works on a macro level this cannot handle that the contents has "macros" in it.

soul

I would not overload texttt like that, make a special macro for it.

texttt

BTW: This works ttfamilyhl#1

ttfamilyhl#1

The working of texttt is essentially absorbing its argument and issuing ttfamily.

texttt

ttfamily

documentclassarticle usepackagexcolor, soul colorletmycolorred!30 sethlcolormycolor DeclareRobustCommandtexttt[1]% hlttfamily#1% begindocument textttcan we highlight enddocument

enter image description here

On the other hand, it would be better to use a different command:

documentclassarticle usepackagexcolor, soul colorletmycolorred!30 sethlcolormycolor DeclareRobustCommandhltt[1]% hlttfamily#1% begindocument hlttcan we highlight enddocument

Don't forget to protect the end-of-lines.

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