[wip] Makefile bootstrap script

1 files changed, 160 insertions, 0 deletions

diff --git a/src/main.c b/src/main.c
new file mode 100644
index 00000000..6cefe212
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,160 @@
+#include <lua.h>
+#include <lualib.h>
+#include <lauxlib.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+typedef struct {
+   char* module_name;
+   char* source_name;
+   int length;
+   const unsigned char* code;
+} Gen;
+
+#include "gen/gen.h"
+#include "gen/libraries.h"
+
+static const char* progname = "luarocks";
+
+/* portable alerts, from srlua */
+#ifdef _WIN32
+#include <windows.h>
+#define alert(message)  MessageBox(NULL, message, progname, MB_ICONERROR | MB_OK)
+#define getprogname()   char name[MAX_PATH]; argv[0]= GetModuleFileName(NULL,name,sizeof(name)) ? name : NULL;
+#else
+#define alert(message)  fprintf(stderr,"%s: %s\n", progname, message)
+#define getprogname()
+#endif
+
+static int registry_key;
+
+/* fatal error, from srlua */
+static void fatal(const char* message) {
+   alert(message);
+   exit(EXIT_FAILURE);
+}
+
+static void load_main(lua_State* L) {
+   #include "gen/main.h"
+
+   if (luaL_loadbuffer(L, luarocks_gen_main, sizeof(luarocks_gen_main), progname) != LUA_OK) {
+      fatal(lua_tostring(L, -1));
+   }
+}
+
+
+static void declare_modules(lua_State* L) {
+   lua_settop(L, 0);                                /* */
+   lua_newtable(L);                                 /* modules */
+   lua_pushlightuserdata(L, (void*) &registry_key); /* modules registry_key */
+   lua_pushvalue(L, 1);                             /* modules registry_key modules */
+   lua_rawset(L, LUA_REGISTRYINDEX);                /* modules */
+
+   for (int i = 0; GEN[i].module_name; i++) {
+      const Gen* entry = &GEN[i];
+      luaL_loadbuffer(L, entry->code, entry->length, entry->source_name);
+      lua_setfield(L, 1, entry->module_name);
+   }
+}
+
+
+/* custom package loader */
+static int pkg_loader(lua_State* L) {
+   lua_pushlightuserdata(L, (void*) &registry_key); /* modname ? registry_key */
+   lua_rawget(L, LUA_REGISTRYINDEX);                /* modname ? modules */
+   lua_pushvalue(L, -1);                            /* modname ? modules modules */
+   lua_pushvalue(L, 1);                             /* modname ? modules modules modname */
+   lua_gettable(L, -2);                             /* modname ? modules mod */
+   if (lua_type(L, -1) == LUA_TNIL) {
+      lua_pop(L, 1);                                /* modname ? modules */
+      lua_pushvalue(L, 1);                          /* modname ? modules modname */
+      lua_pushliteral(L, ".init");                  /* modname ? modules modname ".init" */
+      lua_concat(L, 2);                             /* modname ? modules modname..".init" */
+      lua_gettable(L, -2);                          /* modname ? mod */
+   }
+   return 1;
+}
+
+static void install_pkg_loader(lua_State* L) {
+   lua_settop(L, 0);                                /* */
+   lua_getglobal(L, "table");                       /* table */
+   lua_getfield(L, -1, "insert");                   /* table table.insert */
+   lua_getglobal(L, "package");                     /* table table.insert package */
+   lua_getfield(L, -1, "searchers");                /* table table.insert package package.searchers */
+   if (lua_type(L, -1) == LUA_TNIL) {
+      lua_pop(L, 1);
+      lua_getfield(L, -1, "loaders");               /* table table.insert package package.loaders */
+   }
+   lua_copy(L, 4, 3);                               /* table table.insert package.searchers */
+   lua_settop(L, 3);                                /* table table.insert package.searchers */
+   lua_pushnumber(L, 1);                            /* table table.insert package.searchers 1 */
+   lua_pushcfunction(L, pkg_loader);                /* table table.insert package.searchers 1 pkg_loader */
+   lua_call(L, 3, 0);                               /* table */
+   lua_settop(L, 0);                                /* */
+}
+
+/* main script launcher, from srlua */
+static int pmain(lua_State *L) {
+   int argc = lua_tointeger(L, 1);
+   char** argv = lua_touserdata(L, 2);
+   int i;
+   load_main(L);
+   lua_createtable(L, argc, 0);
+   for (i = 0; i < argc; i++) {
+      lua_pushstring(L, argv[i]);
+      lua_rawseti(L, -2, i);
+   }
+   lua_setglobal(L, "arg");
+   luaL_checkstack(L, argc - 1, "too many arguments to script");
+   for (i = 1; i < argc; i++) {
+      lua_pushstring(L, argv[i]);
+   }
+   lua_call(L, argc - 1, 0);
+   return 0;
+}
+
+/* error handler, from luac */
+static int msghandler (lua_State *L) {
+   /* is error object not a string? */
+   const char *msg = lua_tostring(L, 1);
+   if (msg == NULL) {
+      /* does it have a metamethod that produces a string */
+      if (luaL_callmeta(L, 1, "__tostring") && lua_type(L, -1) == LUA_TSTRING) {
+         /* then that is the message */
+         return 1;
+      } else {
+         msg = lua_pushfstring(L, "(error object is a %s value)", luaL_typename(L, 1));
+      }
+   }
+   /* append a standard traceback */
+   luaL_traceback(L, L, msg, 1);
+   return 1;
+}
+
+/* main function, from srlua */
+int main(int argc, char** argv) {
+   lua_State* L;
+   getprogname();
+   if (argv[0] == NULL) {
+      fatal("cannot locate this executable");
+   }
+   L = luaL_newstate();
+   if (L == NULL) {
+      fatal("not enough memory for state");
+   }
+   luaL_openlibs(L);
+   install_pkg_loader(L);
+   declare_libraries(L);
+   declare_modules(L);
+   lua_pushcfunction(L, &msghandler);
+   lua_pushcfunction(L, &pmain);
+   lua_pushinteger(L, argc);
+   lua_pushlightuserdata(L, argv);
+   if (lua_pcall(L, 2, 0, -4) != 0) {
+      fatal(lua_tostring(L, -1));
+   }
+   lua_close(L);
+   return EXIT_SUCCESS;
+}
+