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, 57 deletions

diff --git a/lexers/ledger.lua b/lexers/ledger.lua
deleted file mode 100644
index 1632241..0000000
--- a/lexers/ledger.lua
+++ /dev/null
@@ -1,57 +0,0 @@
--- Copyright 2015-2016 Charles Lehner. See LICENSE.
--- ledger journal LPeg lexer, see http://www.ledger-cli.org/
-
-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 = 'ledger'}
-
-local delim = P('\t') + P('  ')
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, S(';#') * l.nonnewline^0)
-
--- Strings.
-local sq_str = l.delimited_range("'")
-local dq_str = l.delimited_range('"')
-local label = l.delimited_range('[]', true, true)
-local string = token(l.STRING, sq_str + dq_str + label)
-
--- Date.
-local date = token(l.CONSTANT, l.starts_line((l.digit + S('/-')) ^1))
-
--- Account.
-local account = token(l.VARIABLE,
-                      l.starts_line(S(' \t')^1 * (l.print - delim)^1))
-
--- Amount.
-local amount = token(l.NUMBER, delim * (1 - S(';\r\n'))^1)
-
--- Automated transactions.
-local auto_tx = token(l.PREPROCESSOR, l.starts_line(S('=~') * l.nonnewline^0))
-
--- Directives.
-local directive_word = word_match{
-	'account', 'alias', 'assert', 'bucket', 'capture', 'check', 'comment',
-	'commodity', 'define', 'end', 'fixed', 'endfixed', 'include', 'payee',
-	'apply', 'tag', 'test', 'year'
-} + S('AYNDCIiOobh')
-local directive = token(l.KEYWORD, l.starts_line(S('!@')^-1 * directive_word))
-
-M._rules = {
-  {'account', account},
-  {'amount', amount},
-  {'comment', comment},
-  {'whitespace', ws},
-  {'date', date},
-  {'auto_tx', auto_tx},
-  {'directive', directive},
-}
-
-M._LEXBYLINE = true
-
-return M