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, 89 deletions

diff --git a/lexers/vhdl.lua b/lexers/vhdl.lua
deleted file mode 100644
index 6bbba11..0000000
--- a/lexers/vhdl.lua
+++ /dev/null
@@ -1,89 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- VHDL 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 = 'vhdl'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, '--' * l.nonnewline^0)
-
--- Strings.
-local sq_str = l.delimited_range("'", true, true)
-local dq_str = l.delimited_range('"', true)
-local string = token(l.STRING, sq_str + dq_str)
-
--- Numbers.
-local number = token(l.NUMBER, l.float + l.integer)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match{
-  'access', 'after', 'alias', 'all', 'architecture', 'array', 'assert',
-  'attribute', 'begin', 'block', 'body', 'buffer', 'bus', 'case', 'component',
-  'configuration', 'constant', 'disconnect', 'downto', 'else', 'elsif', 'end',
-  'entity', 'exit', 'file', 'for', 'function', 'generate', 'generic', 'group',
-  'guarded', 'if', 'impure', 'in', 'inertial', 'inout', 'is', 'label',
-  'library', 'linkage', 'literal', 'loop', 'map', 'new', 'next', 'null', 'of',
-  'on', 'open', 'others', 'out', 'package', 'port', 'postponed', 'procedure',
-  'process', 'pure', 'range', 'record', 'register', 'reject', 'report',
-  'return', 'select', 'severity', 'signal', 'shared', 'subtype', 'then', 'to',
-  'transport', 'type', 'unaffected', 'units', 'until', 'use', 'variable',
-  'wait', 'when', 'while', 'with', 'note', 'warning', 'error', 'failure',
-  'and', 'nand', 'or', 'nor', 'xor', 'xnor', 'rol', 'ror', 'sla', 'sll', 'sra',
-  'srl', 'mod', 'rem', 'abs', 'not',
-  'false', 'true'
-})
-
--- Functions.
-local func = token(l.FUNCTION, word_match{
-  'rising_edge', 'shift_left', 'shift_right', 'rotate_left', 'rotate_right',
-  'resize', 'std_match', 'to_integer', 'to_unsigned', 'to_signed', 'unsigned',
-  'signed', 'to_bit', 'to_bitvector', 'to_stdulogic', 'to_stdlogicvector',
-  'to_stdulogicvector'
-})
-
--- Types.
-local type = token(l.TYPE, word_match{
-  'bit', 'bit_vector', 'character', 'boolean', 'integer', 'real', 'time',
-  'string', 'severity_level', 'positive', 'natural', 'signed', 'unsigned',
-  'line', 'text', 'std_logic', 'std_logic_vector', 'std_ulogic',
-  'std_ulogic_vector', 'qsim_state', 'qsim_state_vector', 'qsim_12state',
-  'qsim_12state_vector', 'qsim_strength', 'mux_bit', 'mux_vectory', 'reg_bit',
-  'reg_vector', 'wor_bit', 'wor_vector'
-})
-
--- Constants.
-local constant = token(l.CONSTANT, word_match{
-  'EVENT', 'BASE', 'LEFT', 'RIGHT', 'LOW', 'HIGH', 'ASCENDING', 'IMAGE',
-  'VALUE', 'POS', 'VAL', 'SUCC', 'VAL', 'POS', 'PRED', 'VAL', 'POS', 'LEFTOF',
-  'RIGHTOF', 'LEFT', 'RIGHT', 'LOW', 'HIGH', 'RANGE', 'REVERSE', 'LENGTH',
-  'ASCENDING', 'DELAYED', 'STABLE', 'QUIET', 'TRANSACTION', 'EVENT', 'ACTIVE',
-  'LAST', 'LAST', 'LAST', 'DRIVING', 'DRIVING', 'SIMPLE', 'INSTANCE', 'PATH'
-})
-
--- Identifiers.
-local word = (l.alpha + "'") * (l.alnum + "_" + "'")^1
-local identifier = token(l.IDENTIFIER, word)
-
--- Operators.
-local operator = token(l.OPERATOR, S('=/!:;<>+-/*%&|^~()'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'function', func},
-  {'type', type},
-  {'constant', constant},
-  {'identifier', identifier},
-  {'string', string},
-  {'comment', comment},
-  {'number', number},
-  {'operator', operator},
-}
-
-return M