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/ada.lua b/lexers/ada.lua
deleted file mode 100644
index 7258431..0000000
--- a/lexers/ada.lua
+++ /dev/null
@@ -1,68 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- Ada 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 = 'ada'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, '--' * l.nonnewline^0)
-
--- Strings.
-local string = token(l.STRING, l.delimited_range('"', true, true))
-
--- Numbers.
-local hex_num = 'O' * S('xX') * (l.xdigit + '_')^1
-local integer = l.digit^1 * ('_' * l.digit^1)^0
-local float = integer^1 * ('.' * integer^0)^-1 * S('eE') * S('+-')^-1 * integer
-local number = token(l.NUMBER, hex_num + S('+-')^-1 * (float + integer) *
-                               S('LlUuFf')^-3)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'abort', 'abs', 'accept', 'all', 'and', 'begin', 'body', 'case', 'declare',
-  'delay', 'do', 'else', 'elsif', 'end', 'entry', 'exception', 'exit', 'for',
-  'generic', 'goto', 'if', 'in', 'is', 'loop', 'mod', 'new', 'not', 'null',
-  'or', 'others', 'out', 'protected', 'raise', 'record', 'rem', 'renames',
-  'requeue', 'reverse', 'select', 'separate', 'subtype', 'task', 'terminate',
-  'then', 'type', 'until', 'when', 'while', 'xor',
-  -- Preprocessor.
-  'package', 'pragma', 'use', 'with',
-  -- Function
-  'function', 'procedure', 'return',
-  -- Storage class.
-  'abstract', 'access', 'aliased', 'array', 'at', 'constant', 'delta', 'digits',
-  'interface', 'limited', 'of', 'private', 'range', 'tagged', 'synchronized',
-  -- Boolean.
-  'true', 'false'
-})
-
--- Types.
-local type = token(l.TYPE, word_match{
-  'boolean', 'character', 'count', 'duration', 'float', 'integer', 'long_float',
-  'long_integer', 'priority', 'short_float', 'short_integer', 'string'
-})
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local operator = token(l.OPERATOR, S(':;=<>&+-*/.()'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'type', type},
-  {'identifier', identifier},
-  {'string', string},
-  {'comment', comment},
-  {'number', number},
-  {'operator', operator},
-}
-
-return M