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, 31 insertions, 0 deletions

diff --git a/lua/themes/dark-16.lua b/lua/themes/dark-16.lua
new file mode 100644
index 0000000..986c4b3
--- /dev/null
+++ b/lua/themes/dark-16.lua
@@ -0,0 +1,31 @@
+-- Eight-color scheme
+local lexers = vis.lexers
+-- dark
+lexers.STYLE_DEFAULT = 'back:black,fore:white'
+lexers.STYLE_NOTHING = 'back:black'
+lexers.STYLE_CLASS = 'fore:yellow,bold'
+lexers.STYLE_COMMENT = 'fore:blue,bold'
+lexers.STYLE_CONSTANT = 'fore:cyan,bold'
+lexers.STYLE_DEFINITION = 'fore:blue,bold'
+lexers.STYLE_ERROR = 'fore:red,italics'
+lexers.STYLE_FUNCTION = 'fore:blue,bold'
+lexers.STYLE_KEYWORD = 'fore:yellow,bold'
+lexers.STYLE_LABEL = 'fore:green,bold'
+lexers.STYLE_NUMBER = 'fore:red,bold'
+lexers.STYLE_OPERATOR = 'fore:cyan,bold'
+lexers.STYLE_REGEX = 'fore:green,bold'
+lexers.STYLE_STRING = 'fore:red,bold'
+lexers.STYLE_PREPROCESSOR = 'fore:magenta,bold'
+lexers.STYLE_TAG = 'fore:red,bold'
+lexers.STYLE_TYPE = 'fore:green,bold'
+lexers.STYLE_VARIABLE = 'fore:blue,bold'
+lexers.STYLE_WHITESPACE = ''
+lexers.STYLE_EMBEDDED = 'back:blue,bold'
+lexers.STYLE_IDENTIFIER = 'fore:white'
+
+lexers.STYLE_LINENUMBER = 'fore:white'
+lexers.STYLE_CURSOR = 'reverse'
+lexers.STYLE_CURSOR_PRIMARY = lexers.STYLE_CURSOR..',fore:yellow'
+lexers.STYLE_CURSOR_LINE = 'underlined'
+lexers.STYLE_COLOR_COLUMN = 'back:red'
+lexers.STYLE_SELECTION = 'back:white'