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// Copyright (C) by Josh Blum. See LICENSE.txt for licensing information.
#include <gras/gras.hpp>
#include <boost/filesystem.hpp>
#include <boost/tokenizer.hpp>
#include <boost/foreach.hpp>
#include <stdexcept>
#include <iostream>
#include <cstdlib>
namespace fs = boost::filesystem;
#ifdef BOOST_WINDOWS_API
#include <windows.h>
static const char *SEP = ";";
static bool load_module_in_path(const char *path)
{
return LoadLibrary(path) != NULL;
}
#else
#include <dlfcn.h>
static const char *SEP = ":";
static bool load_module_in_path(const char *path)
{
return dlopen(path, RTLD_LAZY) != NULL;
}
#endif
static void load_all_modules_in_path(const fs::path &path)
{
if (not fs::exists(path)) return;
if (fs::is_regular_file(path))
{
const std::string mod_path = path.string();
if (not load_module_in_path(mod_path.c_str()))
{
std::cerr << "GRAS Module loader fail: " << mod_path << std::endl;
}
return;
}
if (fs::is_directory(path)) for(
fs::directory_iterator dir_itr(path);
dir_itr != fs::directory_iterator();
++dir_itr
) load_all_modules_in_path(dir_itr->path());
}
static void load_modules_from_paths(const std::string &paths, const fs::path &suffix)
{
if (paths.empty()) return;
BOOST_FOREACH(const std::string &path, boost::tokenizer<boost::char_separator<char> > (paths, boost::char_separator<char>(SEP)))
{
if (path.empty()) continue;
load_all_modules_in_path(fs::path(path) / suffix);
}
}
static std::string my_get_env(const std::string &name, const std::string &defalt)
{
const char *env_var = std::getenv(name.c_str());
return (env_var != NULL)? env_var : defalt;
}
GRAS_STATIC_BLOCK(gras_module_loader)
{
//!search the GRAS_ROOT directory for this install
load_modules_from_paths(my_get_env("GRAS_ROOT", "@GRAS_ROOT@"), fs::path("") / "lib@LIB_SUFFIX@" / "gras" / "modules");
//!search the GRAS_PATH search directories for modules
load_modules_from_paths(my_get_env("GRAS_PATH", ""), fs::path("") / "lib@LIB_SUFFIX@" / "gras" / "modules");
//!search the explicit module paths
load_modules_from_paths(my_get_env("GRAS_MODULE_PATH", ""), fs::path(""));
}
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