Move all lua related files to lua/ subfolder

Also remove the lexers sub directory from the Lua search path.
As a result we attempt to open fewer files during startup:

 $ strace -e open -o log ./vis +q config.h && wc -l log

In order to avoid having to modifiy all lexers which `require('lexer')`
we instead place a symlink in the top level directory.

 $ ./configure --disable-lua
 $ rm -rf lua

Should result in a source tree with most lua specifc functionality
removed.

1 files changed, 15 insertions, 0 deletions

diff --git a/lua/visrc.lua b/lua/visrc.lua
new file mode 100644
index 0000000..95aa1c0
--- /dev/null
+++ b/lua/visrc.lua
@@ -0,0 +1,15 @@
+-- load standard vis module, providing parts of the Lua API
+require('vis')
+
+vis.events.start = function()
+	-- Your global configuration options e.g.
+	-- vis:command('map! normal j gj')
+end
+
+vis.events.win_open = function(win)
+	-- enable syntax highlighting for known file types
+	vis.filetype_detect(win)
+
+	-- Your per window configuration options e.g.
+	-- vis:command('set number')
+end