breakablett.tex

\def\seqinsert{\ifmmode\allowbreak\else\hspace{0pt plus 0.02em}\fi}
\def\seqsplit#1{\SQSPL@scan#1\SQSPL@end}
\def\SQSPL@scan{\futurelet\SQSPL@next\SQSPL@scani}
\def\SQSPL@scani#1{%
  \ifx \SQSPL@end \SQSPL@next \def\SQSPL@process{\@gobble}%
  \else \ifx \@sptoken\SQSPL@next \def\SQSPL@process{\SQSPL@sp@doprocess}%
  \else \def\SQSPL@process{\SQSPL@doprocess}\fi\fi%
  \SQSPL@process{#1}}
\def\SQSPL@doprocess#1{#1\SQSPL@insert}
\def\SQSPL@sp@doprocess{◇\SQSPL@scan}
\def\SQSPL@insert{\futurelet\SQSPL@next\SQSPL@doinsert}
\def\SQSPL@doinsert{%
  \ifx \SQSPL@end \SQSPL@next \relax%
  \else \seqinsert \fi%
  \SQSPL@scan}
\def\HS{\space}
\DeclareRobustCommand{\breakablett}[1]{{\ttfamily\seqsplit{#1}}}

Based on seqsplit implementation.