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, 0 insertions, 68 deletions

diff --git a/lexers/toml.lua b/lexers/toml.lua
deleted file mode 100644
index 5a27c97..0000000
--- a/lexers/toml.lua
+++ /dev/null
@@ -1,68 +0,0 @@
--- Copyright 2015-2016 Alejandro Baez (https://keybase.io/baez). See LICENSE.
--- TOML LPeg lexer.
-
-local l = require("lexer")
-local token, word_match = l.token, l.word_match
-local P, R, S = lpeg.P, lpeg.R, lpeg.S
-
-local M = {_NAME = 'toml'}
-
--- Whitespace
-local indent = #l.starts_line(S(' \t')) *
-               (token(l.WHITESPACE, ' ') + token('indent_error', '\t'))^1
-local ws = token(l.WHITESPACE, S(' \t')^1 + l.newline^1)
-
--- Comments.
-local comment = token(l.COMMENT, '#' * l.nonnewline^0)
-
--- Strings.
-local string = token(l.STRING, l.delimited_range("'") + l.delimited_range('"'))
-
--- Numbers.
-local number = token(l.NUMBER, l.float + l.integer)
-
--- Datetime.
-local ts = token('timestamp', l.digit * l.digit * l.digit * l.digit * -- year
-                              '-' * l.digit * l.digit^-1 * -- month
-                              '-' * l.digit * l.digit^-1 * -- day
-                              ((S(' \t')^1 + S('tT'))^-1 * -- separator
-                               l.digit * l.digit^-1 * -- hour
-                               ':' * l.digit * l.digit * -- minute
-                               ':' * l.digit * l.digit * -- second
-                               ('.' * l.digit^0)^-1 * -- fraction
-                               ('Z' + -- timezone
-                                S(' \t')^0 * S('-+') * l.digit * l.digit^-1 *
-                                (':' * l.digit * l.digit)^-1)^-1)^-1)
-
--- kewwords.
-local keyword = token(l.KEYWORD, word_match{
-  'true', 'false'
-})
-
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local operator = token(l.OPERATOR, S('#=+-,.{}[]()'))
-
-M._rules = {
-  {'indent', indent},
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'identifier', identifier},
-  {'operator', operator},
-  {'string', string},
-  {'comment', comment},
-  {'number', number},
-  {'timestamp', ts},
-}
-
-M._tokenstyles = {
-  indent_error = 'back:red',
-  timestamp = l.STYLE_NUMBER,
-}
-
-M._FOLDBYINDENTATION = true
-
-return M