Ritchie Cunningham
267d2477de
OK, this commit finally implements the Copy-on-Write architecure I spoke
about in previous commits.. It also refactors command execution to be
safer and more extensible.
To enable CoW and centralise state-changing, command scripts no longer
modify the VFS directly. Instead, they return a table describing their
intended action '{ action = "rm", target = "file.txt" }'. The C++
CommandProcessor is then responsible for interpreting this and executing
it safely.
37 lines
1.2 KiB
C++
37 lines
1.2 KiB
C++
#include "lua_processor.h"
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#include <sol/forward.hpp>
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#include "vfs.h"
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LuaProcessor::LuaProcessor(void) {
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_lua.open_libraries(sol::lib::base, sol::lib::string, sol::lib::io);
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/* Expose vfs_node struct members to Lua. */
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_lua.new_usertype<vfs_node>("vfs_node",
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"name", &vfs_node::name,
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"type", &vfs_node::type,
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"children", &vfs_node::children,
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"read_only", &vfs_node::read_only); }
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LuaProcessor::~LuaProcessor(void) {}
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sol::object LuaProcessor::execute(const std::string& script, vfs_node* current_dir,
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const std::vector<std::string>& args) {
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try {
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/* Pass C++ objects/points into the Lua env. */
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_lua["current_dir"] = current_dir;
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/* Create and populate the 'arg' table for the script. */
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sol::table arg_table = _lua.create_table();
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for(size_t i = 0; i < args.size(); ++i) {
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arg_table[i+1] = args[i]; /* Lua arrays 1-indexed. */
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}
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_lua["arg"] = arg_table;
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return _lua.script(script);
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} catch(const sol::error& e) {
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/* Return the error message as a string in a sol::object. */
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return sol::make_object(_lua, e.what());
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}
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}
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