Lua support - initial PR

examples/lua/Makefile

@@ -0,0 +1,65 @@
+APPLICATION = lua
+
+# If no BOARD is found in the environment, use this default:
+BOARD ?= native
+
+# This has to be the absolute path to the RIOT base directory:
+RIOTBASE ?= $(CURDIR)/../..
+
+BOARD_INSUFFICIENT_MEMORY := bluepill calliope-mini cc2650-launchpad \
+	                     cc2650stk maple-mini microbit nrf51dongle \
+			     nucleo-f030r8 nucleo-f031k6 nucleo-f042k6 \
+			     nucleo-f070rb nucleo-f072rb nucleo-f103rb \
+			     nucleo-f302r8 nucleo-f303k8 nucleo-f334r8 \
+			     nucleo-f410rb nucleo-l031k6 nucleo-l053r8 \
+			     opencm904 spark-core stm32f0discovery
+
+BOARD_BLACKLIST := arduino-duemilanove arduino-mega2560 arduino-uno \
+                   chronos jiminy-mega256rfr2 mega-xplained mips-malta \
+		   msb-430 msb-430h pic32-clicker pic32-wifire telosb \
+		   waspmote-pro wsn430-v1_3b wsn430-v1_4 z1
+
+
+# Comment this out to disable code in RIOT that does safety checking
+# which is not needed in a production environment but helps in the
+# development process:
+DEVELHELP ?= 1
+
+# Change this to 0 show compiler invocation lines by default:
+QUIET ?= 1
+
+USEMODULE += ps
+
+ifneq ($(BOARD),native)
+  # This stack size is large enough to run Lua print() functions of
+  # various lengths. Other functions untested.
+  CFLAGS += -DTHREAD_STACKSIZE_MAIN=4096
+endif
+
+USEPKG += lua
+
+include $(RIOTBASE)/Makefile.include
+
+# The code below generates a header file from any .lua scripts in the
+# example directory. The header file contains a byte array of the
+# ASCII characters in the .lua script.
+
+LUA_PATH := $(BINDIR)/lua
+
+# add directory of generated *.lua.h files to include path
+CFLAGS += -I$(LUA_PATH)
+
+# generate .lua.h header files of .lua files
+LUA = $(wildcard *.lua)
+
+LUA_H := $(LUA:%.lua=$(LUA_PATH)/%.lua.h)
+
+$(LUA_PATH)/:
+	@mkdir -p $@
+
+$(LUA_H): | $(LUA_PATH)/
+$(LUA_H): $(LUA_PATH)/%.lua.h: %.lua
+
+	xxd -i $< | sed 's/^unsigned/const/g' > $@
+
+$(RIOTBUILD_CONFIG_HEADER_C): $(LUA_H)

examples/lua/README.md

@@ -0,0 +1,22 @@
+### About
+
+This example shows how to write IoT applications using Lua.
+
+### Caveats
+
+Currently, the only actual function available is "print"
+
+### How to use
+
+Put your lua code into "main.lua" (check the example). The file will
+be included in your application as an ASCII byte array. This is done in the
+last 20 or so lines of the example's Makefile.
+
+The script will then be run immediately after RIOT has started up.
+
+### How to run
+
+Type `make flash term`
+
+Note: you may have to press `RESET` on the board (after the flash) if the board
+reboots faster than the terminal program can start..

examples/lua/main.c

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2018 FU Berlin
+ *
+ * This file is subject to the terms and conditions of the GNU Lesser
+ * General Public License v2.1. See the file LICENSE in the top level
+ * directory for more details.
+ */
+
+/**
+ * @ingroup     examples
+ * @{
+ *
+ * @file
+ * @brief       Basic lua example application
+ *
+ * @author      Daniel Petry <daniel.petry@fu-berlin.de>
+ *
+ * @}
+ */
+
+#include <stdio.h>
+#include <errno.h>
+#include "lauxlib.h"
+#include "lualib.h"
+
+#include "main.lua.h"
+
+int lua_run_script(const char *buffer, size_t buffer_len)
+{
+
+    lua_State *L = luaL_newstate();
+
+    if (L == NULL) {
+        puts("cannot create state: not enough memory");
+        return ENOMEM;
+    }
+
+    luaL_openlibs(L);
+    luaL_loadbuffer(L, buffer, buffer_len, "lua input script");
+
+    if (lua_pcall(L, 0, 0, 0) != LUA_OK){
+        puts("Lua script running failed");
+        return EINTR;
+    }
+
+    lua_close(L);
+    return 0;
+}
+
+int main(void)
+{
+    puts("Lua RIOT build");
+    lua_run_script(main_lua, main_lua_len);
+    return 0;
+}

examples/lua/main.lua

@@ -0,0 +1 @@
+print("Hello world, this is lua!")

pkg/lua/Makefile

@@ -0,0 +1,12 @@
+PKG_NAME=lua
+PKG_URL=https://github.com/lua/lua.git
+PKG_VERSION=e354c6355e7f48e087678ec49e340ca0696725b1
+PKG_LICENSE=MIT
+
+.PHONY: all
+
+all:
+	@cp Makefile.lua $(PKG_BUILDDIR)
+	"$(MAKE)" -C $(PKG_BUILDDIR) -f Makefile.lua
+
+include $(RIOTBASE)/pkg/pkg.mk

pkg/lua/Makefile.include

@@ -0,0 +1 @@
+INCLUDES += -I$(PKGDIRBASE)/lua

pkg/lua/Makefile.lua

@@ -0,0 +1,9 @@
+SRC := $(filter-out lua.c luac.c,$(wildcard *.c))
+
+# This builds for native using POSIX system calls and some extra libraries, and
+# removes a compiler warning that warns against using tmpnam().
+ifeq ($(BOARD),native)
+  CFLAGS += -DLUA_USE_LINUX
+endif
+
+include $(RIOTBASE)/Makefile.base

pkg/lua/doc.txt

@@ -0,0 +1,6 @@
+/**
+ * @defgroup pkg_lua Lua ported to RIOT
+ * @ingroup  pkg
+ * @brief    Provides Lua support for RIOT
+ * @see      https://github.com/lua/lua
+ */

pkg/lua/patches/0001-Remove-dependency-on-nonexistent-RIOT-syscalls.patch

@@ -0,0 +1,62 @@
+From b681cb20ee6bfc31b8ba23ec321140aae6e53e9d Mon Sep 17 00:00:00 2001
+From: danpetry <daniel.petry@fu-berlin.de>
+Date: Wed, 23 May 2018 14:09:17 +0200
+Subject: [PATCH 1/1] Remove dependency on nonexistent RIOT syscalls
+
+Os.rename and os.clock, in Lua, now always return an error message.
+Also, l_randomizePivot, which is used by table.sort, will always
+supply 0 rather than a pseudorandom number.
+---
+ loslib.c  | 7 ++-----
+ ltablib.c | 4 +++-
+ 2 files changed, 5 insertions(+), 6 deletions(-)
+
+diff --git a/loslib.c b/loslib.c
+index dd2bb378..f9e5cbd2 100644
+--- a/loslib.c
++++ b/loslib.c
+@@ -157,9 +157,7 @@ static int os_remove (lua_State *L) {
+
+
+ static int os_rename (lua_State *L) {
+-  const char *fromname = luaL_checkstring(L, 1);
+-  const char *toname = luaL_checkstring(L, 2);
+-  return luaL_fileresult(L, rename(fromname, toname) == 0, NULL);
++  return luaL_error(L, "This function is not implemented in RIOT yet");
+ }
+
+
+@@ -181,8 +179,7 @@ static int os_getenv (lua_State *L) {
+
+
+ static int os_clock (lua_State *L) {
+-  lua_pushnumber(L, ((lua_Number)clock())/(lua_Number)CLOCKS_PER_SEC);
+-  return 1;
++  return luaL_error(L, "This function is not implemented in RIOT yet");
+ }
+
+
+diff --git a/ltablib.c b/ltablib.c
+index 588bf40d..8895b653 100644
+--- a/ltablib.c
++++ b/ltablib.c
+@@ -235,13 +235,15 @@ static int unpack (lua_State *L) {
+ /* type for array indices */
+ typedef unsigned int IdxT;
+
+-
+ /*
+ ** Produce a "random" 'unsigned int' to randomize pivot choice. This
+ ** macro is used only when 'sort' detects a big imbalance in the result
+ ** of a partition. (If you don't want/need this "randomness", ~0 is a
+ ** good choice.)
+ */
++
++#define l_randomizePivot() 0
++
+ #if !defined(l_randomizePivot)		/* { */
+
+ #include <time.h>
+-- 
+2.17.0
+