#! /bin/sh
# igawk --- like gawk but do @include processing
#
# Arnold Robbins, [email protected], Public Domain
# July 1993
# December 2010, minor edits

if [ "$1" = debug ]
then
set -x
shift
fi

# A literal newline, so that program text is formatted correctly
n='
'

# Initialize variables to empty
program=
opts=

while [ $# -ne 0 ] # loop over arguments
do
case $1 in
--) shift
break ;;

-W) shift
# The ${x?'message here'} construct prints a
# diagnostic if $x is the null string
set -- -W"${@?'missing operand'}"
continue ;;

-[vF]) opts="$opts $1 '${2?'missing operand'}'"
shift ;;

-[vF]*) opts="$opts '$1'" ;;

-f) program="$program$n@include ${2?'missing operand'}"
shift ;;

-f*) f=$(expr "$1" : '-f\(.*\)')
program="$program$n@include $f" ;;

-[W-]file=*)
f=$(expr "$1" : '-.file=\(.*\)')
program="$program$n@include $f" ;;

-[W-]file)
program="$program$n@include ${2?'missing operand'}"
shift ;;

-[W-]source=*)
t=$(expr "$1" : '-.source=\(.*\)')
program="$program$n$t" ;;

-[W-]source)
program="$program$n${2?'missing operand'}"
shift ;;

-[W-]version)
echo igawk: version 3.0 1>&2
gawk --version
exit 0 ;;

-[W-]*) opts="$opts '$1'" ;;

*) break ;;
esac
shift
done

if [ -z "$program" ]
then
program=${1?'missing program'}
shift
fi

# At this point, `program' has the program.
expand_prog='

function pathto(file, i, t, junk)
{
if (index(file, "/") != 0)
return file

if (file == "-")
return file

for (i = 1; i <= ndirs; i++) {
t = (pathlist[i] "/" file)
if ((getline junk < t) > 0) {
# found it
close(t)
return t
}
}
return ""
}
BEGIN {
path = ENVIRON["AWKPATH"]
ndirs = split(path, pathlist, ":")
for (i = 1; i <= ndirs; i++) {
if (pathlist[i] == "")
pathlist[i] = "."
}
stackptr = 0
input[stackptr] = ARGV[1] # ARGV[1] is first file

for (; stackptr >= 0; stackptr--) {
while ((getline < input[stackptr]) > 0) {
if (tolower($1) != "@include") {
print
continue
}
fpath = pathto($2)
if (fpath == "") {
printf("igawk:%s:%d: cannot find %s\n",
input[stackptr], FNR, $2) > "/dev/stderr"
continue
}
if (! (fpath in processed)) {
processed[fpath] = input[stackptr]
input[++stackptr] = fpath # push onto stack
} else
print $2, "included in", input[stackptr],
"already included in",
processed[fpath] > "/dev/stderr"
}
close(input[stackptr])
}
}' # close quote ends `expand_prog' variable

processed_program=$(gawk -- "$expand_prog" /dev/stdin << EOF
$program
EOF
)
eval gawk $opts -- '"$processed_program"' '"$@"'