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# subtext -*- awk -*-
# (C) C Duckworth <acdw@acdw.net>
## Subtext is an awk program that converts roff-like input to a shell script
## that can output markup. Lines prefixed with . are wrapped in $(...)
## constructs within the `body' function, but lines prefixed with # are
## transported to the top of the file, where they're executed within the shell
## environment.
BEGIN {
## Tuneables
dryrun = dryrun ? dryrun : 0
sopath = sopath ? sopath : "."
sofile = sofile ? sofile : ""
shxend = shxend ? shxend : "%%end"
## Shellfix: escape ` and $ in input
# 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/(^|[^\\$])\\$(\\$+)([^\\$]|$)/\\1\\2\\3/g'"
}
/\\$/ { # line continuation
getline nl
sub(/\\$/, "")
$0 = $0 " " nl
}
### AWK layer
/^%so/ { # source a file
pushpar()
source($2)
next
}
/^%/ { next } # comments
### Shell layer
/^#/ { # head lines
sub(/^#+[ ]*/,"")
head = head (head?"\n":"") $0
next
}
### Text layer
end[endn] && $0 == end[endn] {
par = par "\n" end[endn--] "\n)"
next
}
/^\.\./ { # block
if (match($0, /[ ]*<<[ ]*/))
end[++endn] = substr($0, RSTART+RLENGTH)
else
end[++endn] = ".."
$0 = substr($0, 3, RSTART?RSTART-3:length)
par = par (par?"\n":"") \
"$$(" ($1 ? $1 " " shquote(2) : "") " << " end[endn]
# par = par (par?"\n":"") \
# "$$(unquote + << .." \
# (length>2 ? " | " substr($1,3) " " shquote(2) : "") \
# slurp("..") \
# "..\n)"
next
}
/^\.$/ { next } # continuation line
/^\./ { # line
par = par (body?"\n":"") \
"$$(" substr($1, 2) " " shquote(2) ")"
next
}
/^\\/ { # special line escape
$0 = substr($0, 2)
}
/^$/ { # blank line
if (!pushpar()) next
}
{ # regular text
par = par (par?"\n":"") $0
}
END {
if (dead) exit dead
print "#!/bin/sh"
print "### generated with subtext"
print "quote()(sed \"s/^/$1/\")"
print "unquote()(sed \"s/^$1//\")"
printf "shexpand()(eval \"$(echo 'cat<<%s';cat;echo '%s')\")\n", \
shxend, shxend
printf "shellfix()(%s)\n", shellfix
print "echo()(printf '%s\\n' \"$@\")"
print "handle_input()("\
"test -n \"$1\" && printf '%s' \"$*\";"\
"if read -r first_line;"\
"then echo \"$first_line\";cat;return 0;"\
"else echo;return 1;fi)"
printf "ST_SOPATH=%s\n", sopath
if (sofile) source(sofile)
print "### head"
print head
print "### body"
print "body(){ unquote : << \\_ | shexpand"
pushpar()
shfq = shellfix " -e 's/^/:/'"
print body | shfq
close(shfq)
print "_"
print "}"
if (!dryrun) print "body"
}
function shquote(begin, end, quoted, out) {
if (!begin) begin = 1
if (!end) end = NF
for (i=begin; i<=NF; i++) {
if ($i ~ /^\$/) {
quoted = 1
out = out (out?" ":"") "\"" $i
continue
}
if (($i ~ /\)$/) && quoted) {
quoted = 0
out = out (out?" ":"") $i "\""
continue
}
if (!quoted) {
gsub(/"/, "\\\"", $i)
out = out (out?" ":"") "\"" $i "\""
} else out = out (out?" ":"") $i
}
return out
}
function slurp(to, out, nl) {
while (nl != to) {
getline nl
out = out "\n+" nl
}
sub("\\+"to"$", "", out)
return out
}
function pushpar() {
if (!par) return 0
if (!match(par, /^[ \t\n]*[<$]/)) {
par = "$$(p<<../p\n" par "\n../p\n)"
}
body = body (body?"\n":"") par
par = ""
return 1
}
function source(name, found, sp) {
split(sopath, asopath, ":")
for (dir in asopath) {
fn = asopath[dir] "/" name
sp = asopath[dir] "\n\t" sp
while ((getline ln < fn) > 0) {
found = 1
head = head (head?"\n":"") ln
}
close(fn)
if (found) break
}
if (!found) {
printf "Couldn't source %s; looked in:\n\t%s", name, sp
dead = 127
exit
}
}
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