#!/usr/bin/env bash
set -euo pipefail

cd "$(dirname "$0")"

if [[ "$#" -lt 2 || "$#" -gt 3 ]]; then
    echo "usage: $0 <set-name> <append-name> [relative-prefix]" >&2
    exit 1
fi

set_name=$1
append_name=$2
relative_prefix=${3:-}

awk -v set_name="$set_name" -v append_name="$append_name" -v relative_prefix="$relative_prefix" '
    $0 ~ "^[[:space:]]*set\\(" set_name "([[:space:]]|$)" {
        in_set = 1
        next
    }
    in_set && /^[[:space:]]*\)/ {
        in_set = 0
        next
    }
    $0 ~ "^[[:space:]]*list\\(APPEND " append_name "([[:space:]]|$)" {
        in_append = 1
        next
    }
    in_append && /^[[:space:]]*\)/ {
        in_append = 0
        next
    }
    in_set || in_append {
        line = $0
        sub(/^[[:space:]]*/, "", line)
        sub(/[[:space:]]*$/, "", line)
        if (line == "") {
            next
        }
        sub(/^\$\{CMAKE_CURRENT_SOURCE_DIR\}\//, "core/", line)
        if (line !~ /^core\// && relative_prefix != "") {
            line = relative_prefix line
        }
        print line
    }
' core/CMakeLists.txt