/*
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* =====================================================================================
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*
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* Filename: box.cpp
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*
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* Description:
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*
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* Version: 1.0
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* Created: 2021年04月13日 15时21分44秒
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* Revision: none
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* Compiler: gcc
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*
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* Author: Li Chao (), lichao@aiotlink.com
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* Organization:
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*
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* =====================================================================================
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*/
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#include "box.h"
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#include <boost/filesystem/path.hpp>
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#include <map>
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#include <unordered_map>
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namespace fs = boost::filesystem;
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namespace
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{
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class Box
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{
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public:
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bool Install(const std::string &name, MainFunc const &func, const std::string &desc)
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{
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return functions_.emplace(name, FuncInfo{name, func, desc}).second;
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}
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bool Find(const std::string &name, MainFunc &func)
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{
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auto pos = functions_.find(name);
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if (pos != functions_.end()) {
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func = pos->second.func_;
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return true;
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}
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return false;
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}
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void Apply(std::function<void(const std::string &id, const std::string &desc)> f) const
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{
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for (auto &kv : functions_) {
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f(kv.second.id_, kv.second.desc_);
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}
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}
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private:
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struct FuncInfo {
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std::string id_;
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MainFunc func_;
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std::string desc_;
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};
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std::unordered_map<std::string, FuncInfo> functions_;
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};
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Box &TheBox()
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{
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static Box box;
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return box;
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}
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} // namespace
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bool BoxInstall(const std::string &name, MainFunc const &func, const std::string &desc)
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{
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return TheBox().Install(name, func, desc);
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}
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bool BoxFind(const std::string &name, MainFunc &func)
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{
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return TheBox().Find(name, func);
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}
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const std::string kOrigName("bhshmqbox");
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inline void PrintLn() { putchar('\n'); }
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template <class... Params>
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void PrintLn(const char *fmt, Params &&...t)
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{
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printf(fmt, std::forward<decltype(t)>(t)...);
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PrintLn();
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}
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void Help()
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{
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PrintLn("%s : bhome shared memory message queue box application.", kOrigName.c_str());
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PrintLn("usage:");
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PrintLn("\t1) %s [function [options]...]", kOrigName.c_str());
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PrintLn("\t2) rename or link %s to a function name then run it directly.", kOrigName.c_str());
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PrintLn();
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PrintLn("supported functions:");
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std::map<std::string, std::string> funcs;
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auto getInfo = [&](const std::string &name, const std::string &desc) {
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funcs[name] = desc;
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};
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TheBox().Apply(getInfo);
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auto cmp_name_len = [](auto &a, auto &b) { return a.first.size() < b.first.size(); };
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int max_len = std::max_element(funcs.begin(), funcs.end(), cmp_name_len)->first.size();
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for (auto &kv : funcs) {
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int npad = max_len - kv.first.size();
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PrintLn();
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PrintLn("\t%s%s : %s", kv.first.c_str(), std::string(npad, ' ').c_str(), kv.second.c_str());
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}
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PrintLn();
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}
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int BoxMain(int argc, const char *argv[])
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{
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fs::path exe(argv[0]);
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auto name = exe.filename().string();
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MainFunc func;
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if (BoxFind(name, func)) {
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return func(argc, argv);
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} else {
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PrintLn("%s : function not found!", name.c_str());
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// Help();
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}
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return 0;
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}
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int main(int argc, const char *argv[])
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{
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BoxInstall(
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"help", [](int, const char **) { Help(); return 0; }, "show this help message.");
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fs::path exe(argv[0]);
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auto name = exe.filename().string();
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// PrintLn("name: %s", name.c_str());
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if (name == kOrigName) {
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if (argc > 1) {
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argc--;
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argv++;
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} else {
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Help();
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return 0;
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}
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}
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return BoxMain(argc, argv);
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}
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