int main(int argc, char *argv[])
{
if(argc < 2)
{
PrintHelp();
return 1;
}
map<string, string> systems;
DisjointSet links;
ifstream in(argv[1]);
string line;
string current;
while(getline(in, line))
{
// Skip blank lines.
if(IsEmpty(line))
continue;
// If this line is not indented, it starts a new root object.
if(line[0] > ' ')
current.clear();
if(Token(line, 0) == "system")
current = Token(line, 1);
else if(!current.empty() && Token(line, 0) == "link")
links.Join(current, Token(line, 1));
if(!current.empty())
{
systems[current] += line;
systems[current] += '\n';
}
}
vector<string> components;
for(char **it = argv + 2; *it; ++it)
components.push_back(*it);
for(const pair<string, string> &it : systems)
{
bool match = components.empty();
for(const string &component : components)
match |= links.IsJoined(it.first, component);
if(match)
cout << it.second << endl;
}
return 0;
}
