237 lines
6.5 KiB
C++
237 lines
6.5 KiB
C++
#include "command.hpp"
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#include "misc.hpp"
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#include "zip.hpp"
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#include "globalwrap.hpp"
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#include <set>
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#include <map>
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namespace
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{
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globalwrap<std::map<std::string, command*>> commands;
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std::set<std::string> command_stack;
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std::map<std::string, std::list<std::string>> aliases;
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function_ptr_command<arg_filename> run_script("run-script", "run file as a script",
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"Syntax: run-script <file>\nRuns file <file> just as it would have been entered in the command line\n",
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[](arg_filename filename) throw(std::bad_alloc, std::runtime_error) {
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std::istream* o = NULL;
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try {
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o = &open_file_relative(filename, "");
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messages << "Running '" << std::string(filename) << "'" << std::endl;
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std::string line;
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while(std::getline(*o, line))
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command::invokeC(line);
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delete o;
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} catch(std::exception& e) {
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if(o)
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delete o;
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throw;
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}
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});
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function_ptr_command<> show_aliases("show-aliases", "show aliases",
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"Syntax: show-aliases\nShow expansions of all aliases\n",
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[]() throw(std::bad_alloc, std::runtime_error) {
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for(auto i : aliases)
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for(auto j = i.second.begin(); j != i.second.end(); j++)
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messages << "alias " << i.first << " " << *j << std::endl;
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});
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function_ptr_command<tokensplitter&> unalias_command("unalias-command", "unalias a command",
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"Syntax: unalias-command <aliasname>\nClear expansion of alias <aliasname>\n",
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[](tokensplitter& t) throw(std::bad_alloc, std::runtime_error) {
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std::string aliasname = t;
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if(t)
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throw std::runtime_error("This command only takes one argument");
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if(aliasname.length() == 0 || aliasname[0] == '?' || aliasname[0] == '*')
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throw std::runtime_error("Illegal alias name");
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aliases[aliasname].clear();
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messages << "Command '" << aliasname << "' unaliased" << std::endl;
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});
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function_ptr_command<tokensplitter&> alias_command("alias-command", "alias a command",
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"Syntax: alias-command <aliasname> <command>\nAppend <command> to expansion of alias <aliasname>\n"
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"Valid alias names can't be empty nor start with '*' or '?'\n",
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[](tokensplitter& t) throw(std::bad_alloc, std::runtime_error) {
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std::string aliasname = t;
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std::string command = t.tail();
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if(command == "")
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throw std::runtime_error("Alias name and command needed");
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if(aliasname.length() == 0 || aliasname[0] == '?' || aliasname[0] == '*')
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throw std::runtime_error("Illegal alias name");
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aliases[aliasname].push_back(command);
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messages << "Command '" << aliasname << "' aliased to '" << command << "'" << std::endl;
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});
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}
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command::command(const std::string& cmd) throw(std::bad_alloc)
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{
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if(commands().count(cmd))
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std::cerr << "WARNING: Command collision for " << cmd << "!" << std::endl;
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commands()[commandname = cmd] = this;
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}
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command::~command() throw()
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{
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commands().erase(commandname);
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}
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void command::invokeC(const std::string& cmd) throw()
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{
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try {
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std::string cmd2 = cmd;
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if(cmd2[cmd2.length() - 1] == '\r')
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cmd2 = cmd2.substr(0, cmd2.length() - 1);
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if(cmd2 == "?") {
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//The special ? command.
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for(auto i : commands())
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messages << i.first << ": " << i.second->get_short_help() << std::endl;
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return;
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}
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if(cmd2.length() > 1 && cmd2[0] == '?') {
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//?command.
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size_t split = cmd2.find_first_of(" \t");
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std::string rcmd;
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if(split >= cmd2.length())
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rcmd = cmd2.substr(1);
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else
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rcmd = cmd2.substr(1, split - 1);
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if(rcmd.length() > 0 && rcmd[0] != '*') {
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//This may be an alias.
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std::string aname = cmd2.substr(1);
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if(aliases.count(aname)) {
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//Yup.
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messages << aname << " is an alias for: " << std::endl;
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size_t j = 0;
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for(auto i : aliases[aname])
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messages << "#" + (++j) << ": " << i << std::endl;
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return;
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}
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}
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if(rcmd.length() > 0 && rcmd[0] == '*')
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rcmd = rcmd.substr(1);
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if(!commands().count(rcmd)) {
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if(rcmd != "")
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messages << "Unknown command '" << rcmd << "'" << std::endl;
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return;
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}
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messages << commands()[rcmd]->get_long_help() << std::endl;
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return;
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}
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bool may_be_alias_expanded = true;
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if(cmd2.length() > 0 && cmd2[0] == '*') {
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may_be_alias_expanded = false;
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cmd2 = cmd2.substr(1);
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}
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if(may_be_alias_expanded && aliases.count(cmd2)) {
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for(auto i : aliases[cmd2])
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invokeC(i);
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return;
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}
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try {
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size_t split = cmd2.find_first_of(" \t");
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std::string rcmd;
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if(split >= cmd2.length())
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rcmd = cmd2;
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else
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rcmd = cmd2.substr(0, split);
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split = cmd2.find_first_not_of(" \t", split);
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std::string args;
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if(split < cmd2.length())
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args = cmd2.substr(split);
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command* cmdh = NULL;
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if(commands().count(rcmd))
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cmdh = commands()[rcmd];
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if(!cmdh) {
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messages << "Unknown command '" << rcmd << "'" << std::endl;
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return;
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}
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if(command_stack.count(cmd2))
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throw std::runtime_error("Recursive command invocation");
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command_stack.insert(cmd2);
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cmdh->invoke(args);
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command_stack.erase(cmd2);
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return;
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} catch(std::bad_alloc& e) {
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OOM_panic();
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} catch(std::exception& e) {
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messages << "Error: " << e.what() << std::endl;
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command_stack.erase(cmd2);
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return;
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}
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} catch(std::bad_alloc& e) {
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OOM_panic();
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}
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}
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std::string command::get_short_help() throw(std::bad_alloc)
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{
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return "No description available";
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}
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std::string command::get_long_help() throw(std::bad_alloc)
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{
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return "No help available on command " + commandname;
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}
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tokensplitter::tokensplitter(const std::string& _line) throw(std::bad_alloc)
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{
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line = _line;
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position = 0;
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}
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tokensplitter::operator bool() throw()
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{
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return (position < line.length());
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}
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tokensplitter::operator std::string() throw(std::bad_alloc)
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{
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size_t nextp, oldp = position;
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nextp = line.find_first_of(" \t", position);
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if(nextp > line.length()) {
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position = line.length();
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return line.substr(oldp);
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} else {
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position = nextp;
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while(position < line.length() && (line[position] == ' ' || line[position] == '\t'))
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position++;
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return line.substr(oldp, nextp - oldp);
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}
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}
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std::string tokensplitter::tail() throw(std::bad_alloc)
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{
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return line.substr(position);
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}
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template<>
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void invoke_command_fn(void (*fn)(const std::string& args), const std::string& args)
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{
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fn(args);
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}
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template<>
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void invoke_command_fn(void (*fn)(), const std::string& args)
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{
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if(args != "")
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throw std::runtime_error("This command does not take arguments");
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fn();
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}
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template<>
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void invoke_command_fn(void (*fn)(struct arg_filename a), const std::string& args)
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{
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if(args == "")
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throw std::runtime_error("Filename required");
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arg_filename b;
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b.v = args;
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fn(b);
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}
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template<>
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void invoke_command_fn(void (*fn)(tokensplitter& a), const std::string& args)
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{
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tokensplitter t(args);
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fn(t);
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}
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