Literate programming/Bird conversion via sed
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# bird2code.sed
/^>/ !p
/^>/ {
i\
\\begin{code}
:loop
N
/\n>[^\n]*$/{
b loop
}
s/^> //
s/\(\n\)> /\1/g
s/\n$//
a\
\\end{code}\
p
}
should be run as:
sed -nf bird2code.sed < code.lhs > code.tex
Note that the above sed script does not handle all input well. For example, if the last line of an input file is a line of bird-style code and there is no newline before end-of-file, than the last "/end{code}" is omitted. You are advised to consider using the alternative awk script.