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# subtext -- text substitutor -*- awk -*-
# (C) C Duckworth <acdw@acdw.net>
BEGIN {
## Tuneables
postproc = get_value(postproc, "ST_POSTPROC", "shexpand")
bodyfunc = get_value(bodyfunc, "ST_BODYFUNC", "sub_text")
sopath = get_value(sopath, "ST_SOPATH", ".:"ENVIRON["HOME"]"/.subtext")
split(sopath, asopath, ":")
# postproc = postproc ? postproc : "shexpand"
# bodyfunc = bodyfunc ? bodyfunc : "sub_text"
## Globals
# Booleans
true = 1
false = 0
## Wrap the text in a function
pretext = "### begin text\n"bodyfunc"(){\n"
posttext = "}\n### end text"
## Prelude function strings
# 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/^/:/'"
htmlfix = "sed -E" \
" -e 's#([^\\\\]|^)&#\\1\\&#g'" \
" -e 's#([^\\\\]|^)<#\\1\\<#g'" \
" -e 's#([^\\\\]|^)>#\\1\\>#g'" \
" -e 's#\\\\([&<>])#\\1#g'";
## Prelude
par = "#!/bin/sh\n### kernel\n" \
"preface()(sed \"s/^/$1/\")\n" \
"unpreface()(sed \"s/^$1//\")\n" \
"shexpand()(eval \"$( (echo 'cat<<.';preface +;echo .)" \
" | unpreface + )\")\n" \
"### library\n" \
"shellfix()(" shellfix ")\n" \
"htmlfix()(" htmlfix ")\n" \
"### variables\n" \
"ST_POSTPROC=" postproc "\n" \
"ST_BODYFUNC=" bodyfunc "\n" \
"ST_SOPATH=" sopath "\n" \
"### header\n"
}
### End a block
end[endn] && $0 == end[endn] {
par = par "\n" end[endn--] "\n)"
printpar()
subdocp = false
next
}
### Line continuation
/\\$/ {
getline nl
sub(/\\$/,"")
$0 = $0 " " nl
}
### Special commands
## These call subtext-internal functions
/^\.so/ { # Insert $2 verbatim (if in sopath), else error
source($2)
next
}
### Escape sequences
/^\.\.\./ { # Delimit document (end is optional)
printpar()
docp = !docp
if (docp) print pretext "unpreface ':'<<'_'|eval \"$ST_POSTPROC\""
else end_text()
next
}
/^\.\./ && docp { # Begin a heredoc
# ..[<command>] [<options>] [<<delim]
## ends with DELIM or '..'
subdocp = true
end[++endn] = (match($0,"<<") ? substr($0,RSTART+RLENGTH) : "..")
command = substr($0, 3, RSTART ? RSTART - 2 : length)
$0 = "$$(" (command ? command : "cat") "<<" end[endn]
}
/^\./ && docp { # One-line command
# .<command> [<parameters>]
## wraps the line in $( ... ), basically (also quotes)
specialp = 2
gsub(/"/,"\\\\&")
ln = "$$(" substr($1, 2)
for (f=2;f<=NF;f++) ln = ln " \"" $f "\""
ln = ln ")"
$0 = ln
}
/^\\/ && docp { # \ at the beginning of a line escapes the next character
$0 = substr($0, 2)
}
### Book-keeping
/^$/ {
if (!par) next
printpar()
}
{ par = par (par?"\n":"") $0 }
{ if (--specialp < 0) specialp = 0 }
END {
if (dead) exit dead
if (par) printpar()
while (endn > 0)
print "\n" end[endn--] "\n)"
if (docp) end_text()
}
function end_text() {
print "_\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 = ""
}
function get_value(var, env_var, default) {
if (var) return var
else if (ENVIRON[env_var]) return ENVIRON[env_var]
else return default
}
function source(name) {
found = false
sp = ""
for (dir in asopath) {
fn = asopath[dir] "/" name
sp = asopath[dir] "\n\t" sp
while ((getline ln < fn) > 0) {
found = true
par = par (par?"\n":"") ln
}
if (found) break
}
if (!found)
die("Couldn't source " name "; looked in:\n\t" sp, 9)
}
function die(message, code) {
dead = code
print "!!" FILENAME ":" NR ": " message > "/dev/stderr"
exit
}
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