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#!/bin/sh
{ excitable="text" "exec" "awk" "-f" "$0" "$@"; } # -*- awk -*-
# usage: et <file> | sh
BEGIN {
xend = xend ? xend : "...end...shexpand..."
dend = dend ? dend : "...end...document..."
# We shell out to sed for this because awk doesn't do capture groups ;-;
shellfix = "sed -E" \
" -e 's/`/\\\\`/g'" \
" -e 's/(^|[^\\$])\\$([^\\$]|$)/\\1\\\\$\\2/g'" \
" -e 's/(^|[^\\$])\\$(\\$+)([^\\$]|$)/\\1\\2\\3/g'"
htmlfix = "sed -E" \
" -e 's#([^\\\\]|^)&#\\1\\&#g;'" \
" -e 's#([^\\\\]|^)<#\\1\\<#g;'" \
" -e 's#([^\\\\]|^)>#\\1\\>#g;'" \
" -e 's#\\\\([&<>])#\\1#g;'"
true = 1 ; false = 0
print "shexpand()(eval \"$(echo \"cat<<'"xend"'\";cat;echo "xend")\")"
print "shellfix()(" shellfix ")"
print "htmlfix()(" htmlfix ")"
}
end[endn] && $0 == end[endn] {
par = par "\n" end[endn--] "\n)"
printpar()
subdocp = false
next
}
/\\$/ {
getline nl
sub(/\\$/,"")
$0 = $0 " " nl
}
/^\.\.\./ {
printpar()
docp = !docp
docend = $2 ? $2 : dend
if (docp)
print "shexpand<<" docend
else
print docend "\n"
next
}
/^\.\./ && docp {
subdocp = true
end[++endn] = (match($0,"<<") ? substr($0,RSTART+RLENGTH) : "..")
command = substr($0, 3, RSTART ? RSTART - 2 : length)
$0 = "$$(" (command ? command : "cat") "<<" end[endn]
}
/^\./ && docp {
specialp = 2
gsub(/"/,"\\\\&")
ln = "$$(" substr($1, 2)
for (f=2;f<=NF;f++)
ln = ln " \"" $f "\""
ln = ln ")"
$0 = ln
}
/^$/ {
if (!par) next
printpar()
}
{ par = par (par?"\n":"") $0 }
{ if (--specialp < 0) specialp = 0 }
END {
if (par) printpar()
if (docp) print docend
}
function printpar() {
specialp = specialp || (match(par, /^[ ]*</))
if (docp) {
if (!subdocp && !specialp)
par = "<p>" par "</p>"
print par | shellfix
print ""
close(shellfix)
} else
print par
par = ""
}
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