vis: refactor Lua integration

Lua support can now be disabled at compile time using:

 $ make CONFIG_LUA=0

This commit also adds an initial Lua API and provides a few
default hooks.

We now also require Lua >= 5.2 due to the uservalue constructs.
In principle the same functionality could be implemented using
function environments from Lua 5.1.

1 files changed, 4 insertions, 4 deletions

diff --git a/Makefile b/Makefile
index 16d62cb..5e71790 100644
--- a/Makefile
+++ b/Makefile
@@ -21,10 +21,10 @@ LIBTERMKEY_SHA1 = 0a78ba7aaa2f3b53f2273268366fef349c9be4ab
 
 #LIBLUA = lua-5.3.1
 #LIBLUA_SHA1 = 1676c6a041d90b6982db8cef1e5fb26000ab6dee
-#LIBLUA = lua-5.2.4
-#LIBLUA_SHA1 = ef15259421197e3d85b7d6e4871b8c26fd82c1cf
-LIBLUA = lua-5.1.5
-LIBLUA_SHA1 = b3882111ad02ecc6b972f8c1241647905cb2e3fc
+LIBLUA = lua-5.2.4
+LIBLUA_SHA1 = ef15259421197e3d85b7d6e4871b8c26fd82c1cf
+#LIBLUA = lua-5.1.5
+#LIBLUA_SHA1 = b3882111ad02ecc6b972f8c1241647905cb2e3fc
 
 LIBLPEG = lpeg-1.0.0
 LIBLPEG_SHA1 = 64a0920c9243b624a277c987d2219b6c50c43971