From fceff74eae7daf2026a515448f62eb99ba1b83d6 Mon Sep 17 00:00:00 2001
From: Michael Forney <mforney@mforney.org>
Date: Fri, 18 Nov 2016 21:35:52 -0800
Subject: Allow building lpeg into vis

If lpeg is built statically, this allows for a completely static vis
binary that still supports syntax highlighting.
---
 Makefile  | 2 ++
 vis-lua.c | 9 +++++++++
 2 files changed, 11 insertions(+)

diff --git a/Makefile b/Makefile
index 962fb7e..2311f3d 100644
--- a/Makefile
+++ b/Makefile
@@ -16,6 +16,7 @@ MANPREFIX ?= ${PREFIX}/man
 VERSION = $(shell git describe --always 2>/dev/null || echo "0.2")
 
 CONFIG_LUA ?= 1
+CONFIG_BUILTIN_LPEG ?= 0
 CONFIG_ACL ?= 0
 CONFIG_SELINUX ?= 0
 
@@ -28,6 +29,7 @@ CFLAGS_VIS = $(CFLAGS_AUTO) $(CFLAGS_TERMKEY) $(CFLAGS_CURSES) $(CFLAGS_ACL) \
 
 CFLAGS_VIS += -DVIS_PATH=\"${SHAREPREFIX}/vis\"
 CFLAGS_VIS += -DCONFIG_LUA=${CONFIG_LUA}
+CFLAGS_VIS += -DCONFIG_BUILTIN_LPEG=${CONFIG_BUILTIN_LPEG}
 CFLAGS_VIS += -DCONFIG_SELINUX=${CONFIG_SELINUX}
 CFLAGS_VIS += -DCONFIG_ACL=${CONFIG_ACL}
 CFLAGS_VIS += ${CFLAGS_DEBUG}
diff --git a/vis-lua.c b/vis-lua.c
index 29e94ef..95cfe6e 100644
--- a/vis-lua.c
+++ b/vis-lua.c
@@ -1889,6 +1889,15 @@ void vis_lua_init(Vis *vis) {
 	vis->lua = L;
 	luaL_openlibs(L);
 
+#if CONFIG_BUILTIN_LPEG
+	extern int luaopen_lpeg(lua_State *L);
+	lua_getglobal(L, "package");
+	lua_getfield(L, -1, "preload");
+	lua_pushcfunction(L, luaopen_lpeg);
+	lua_setfield(L, -2, "lpeg");
+	lua_pop(L, 2);
+#endif
+
 	/* remove any relative paths from lua's default package.path */
 	vis_lua_path_strip(vis);
 
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