Have a look at TeX's \discretionary, Bogdan : this
may give you some ideas.
Philip Taylor
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Bogdan Butnaru wrote:
I was wondering if is it possible to do write a LaTeX command that
provides text alternatives when the line-breaking algorithm can’t find
good line breaks. For example, a command that for:
Pretext \alternate{something}{a thing} post-text.
runs the line-breaking algorithm for “Pretext something post-text.”
but if gets bad results (i.e., if it would report
an underful or overful hbox) tries again with “Pretext a thing
post-text.”
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