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#!/bin/sh
{ excitable="text" "exec" "awk" "-f" "$0" "$@"; } # -*- awk -*-
# usage: et <file> | sh
BEGIN {
# Tuneables
postproc = postproc ? postproc : "shexpand"
bodyfunc = bodyfunc ? bodyfunc : "body"
# Globals
wrpfx = ";:"; shxpfx = "!shx!"; def_docend = "---end---"
pretext = bodyfunc"(){\n"; posttext = "}\n"bodyfunc
# Ask sed to do these b/c awk has no capture groups ;_;
shellfix = "sed -E" \
" -e 's/`/\\\\`/g'" \
" -e 's/(^|[^\\$])\\$([^\\$]|$)/\\1\\\\$\\2/g'" \
" -e 's/(^|[^\\$])\\$(\\$+)([^\\$]|$)/\\1\\2\\3/g'"
shxwrap = " -e 's/^/"wrpfx"/'"
htmlfix = "sed -E" \
" -e 's#([^\\\\]|^)&#\\1\\&#g'" \
" -e 's#([^\\\\]|^)<#\\1\\<#g'" \
" -e 's#([^\\\\]|^)>#\\1\\>#g'" \
" -e 's#\\\\([&<>])#\\1#g'"
true = 1 ; false = 0
print "### excitable text ###"
print "wrap()(sed \"s/^/$1/\");unwrap()(sed \"s/^$1//\")"
print "shexpand()(eval"\
" \"$(:;(echo 'cat<<.';sed 's/^/"shxpfx"/';echo .)"\
"|unwrap "shxpfx")\")"
print "shellfix()(" shellfix ")\nhtmlfix()(" htmlfix ")"
print "postproc=" postproc
}
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 ? $2 : def_docend
if (docp) print pretext "unwrap '" wrpfx "'" \
"<<'" docend "'|$postproc"
else end_text()
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) end_text()
}
function end_text() {
print docend "\n" posttext
}
function printpar() {
specialp = specialp || (match(par, /^[ ]*</))
if (docp) {
if (!subdocp && !specialp) par = "<p>" par "</p>"
shx = shellfix shxwrap
print par | shx
close(shx)
} else print par
par = ""
}
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