[tex-eplain] Poetry environment

[John Frampton]

Sorry, I didn't get what you wanted.  How about?

\def\poem{\line\bgroup
    \hfil
    \vtop\bgroup
       \halign\bgroup ##\hfil\cr
}
\def\midpoem{\egroup\egroup \hfil
    \vtop\bgroup
       \halign\bgroup ##\hfil\cr
}
\def\endpoem{\egroup\egroup \hfil\egroup}

\poem
I wandered lonely as a cloud\cr
That floats on high o'er vales and hills,\cr
When all at once I saw a crowd,\cr
A host, of golden daffodils;\cr
Beside the lake, beneath the trees,\cr
Fluttering and dancing in the breeze.\cr
\midpoem
Continuous as the stars that shine\cr
And twinkle on the milky way,\cr
They stretched in never-ending line\cr
Along the margin of a bay:\cr
Ten thousand saw I at a glance,\cr
Tossing their heads in sprightly dance.\cr
\endpoem