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#!/bin/sh
set -euo pipefail
ON_EXIT_ITEMS=()
on_exit() {
while [ ${#ON_EXIT_ITEMS[*]} -ne 0 ]; do
eval "${ON_EXIT_ITEMS[${#ON_EXIT_ITEMS[@]}-1]}"
unset ON_EXIT_ITEMS[${#ON_EXIT_ITEMS[@]}-1]
done
}
add_on_exit() {
local N=${#ON_EXIT_ITEMS[*]}
ON_EXIT_ITEMS["${N}"]="$*"
if [[ "${N}" -eq 0 ]]; then
trap on_exit EXIT
fi
}
TARGETFILE="$1"
HEADER="$2"
TMPFILE=$(mktemp)
add_on_exit "rm -f '${TMPFILE}'"
cat "$HEADER" > "$TMPFILE"
awk '
BEGIN { state = 0 }
/^\/\*/ {
if (state == 0) {
state = 1
}
}
/\*\// {
if (state == 1) {
$0 = substr($0, index($0, "*/") + 2)
sub(/^[[:blank:]]*/, "")
state = 2
}
}
{
if (state != 1) {
print
state = 2
}
}
' "$TARGETFILE" | \
awk '
BEGIN { state = 0 }
/^[[:blank:]]*$/ { if (state == 1) print }
/[^[:blank:]]/ { state = 1; print }
' >> "$TMPFILE"
cp -f "$TMPFILE" "$TARGETFILE"
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