tex4ht driver is broken

[hmenke]

Making the tex4ht documentation currently fails with

! Missing number, treated as zero.
<to be read again> 
                   X
l.11 \begin{document}

A little more insight can be gained by adding \tracingall to the pgfmanual.tex file.

diff --git a/doc/generic/pgf/version-for-tex4ht/en/pgfmanual.tex b/doc/generic/pgf/version-for-tex4ht/en/pgfmanual.tex
index 4bc4b274..9ef5a922 100644
--- a/doc/generic/pgf/version-for-tex4ht/en/pgfmanual.tex
+++ b/doc/generic/pgf/version-for-tex4ht/en/pgfmanual.tex
@@ -12,5 +12,6 @@
 % pgf version is defined in \pgfversion in file
 % generic/pgf/utilities/pgfrcs.code.tex 
 
+\tracingall
 \input{../pgfmanual-tex4ht.cfg}
 \input{../../text-en/pgfmanual-en-main.tex}

Then it seems like there is a problem with xcolor.

\colornameprefix ->XC@
! Missing number, treated as zero.
<to be read again> 
                   X
\colornameprefix ->X
                    C@
\XC@c@lcD #1#2#3#4->\dimen@ #3
                              \p@ \rdivide \dimen@ {#1}\edef #4{\strip@pt \d...

\HColor!gray ...\XC@c@lcD \rangeGray {}{#1}\@@tmp 
                                                  \int:of \:tempa {255}{\@@t...

\XC@definec@lor ...sname HColor!#4\endcsname #3!//
                                                  \edef \:temp {{HColor}{#1}...

\:begindocumenthook ...efinecolor {gray}{gray}{.5}
                                                   \definecolor {darkgreen}{...

\@begindocumenthook ...csname \:begindocumenthook 
                                                  \csname b:AtBeginDocument\...

\document ...ent \@firstofone \@begindocumenthook 
                                                  \ifdim \topskip <1sp\globa...

\document ... \let \no@document \:UnDef \document 
                                                  \at:startdoc 
\:temp ...:opt }\csname begin\endcsname {document}
                                                  \EndPreamble 
\document ...nput \config:file \relax }\fi \:temp 
                                                  \let \@latex@error \:latex...
l.11 \begin{document}

[hmenke]

xcolor problem confirmed. MWE:

\documentclass{article}
\usepackage{xcolor}
\AtBeginDocument{\definecolor{gray}{gray}{.5}}
\begin{document}
\end{document}

[hmenke]

Corresponding thread on the tex4ht list: https://tug.org/pipermail/tex4ht/2019q2/002242.html

[samcarter]

For me the color problems was caused by a local color.cfg within the pgf documentation tree.

Without this file I can run tex4ht in the version-for-pdftex folder. There a few minor issues with the code of the text itself, but if I temporally remove them, I can create an html version of the manual. (I did not yet test in the version-for-tex4ht folder due to long compilation time)

[hmenke]

Since the manual compiles now (at least it doesn't cause errors) I'm closing this.