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, 82 deletions

diff --git a/lexers/powershell.lua b/lexers/powershell.lua
deleted file mode 100644
index 4a3ba07..0000000
--- a/lexers/powershell.lua
+++ /dev/null
@@ -1,82 +0,0 @@
--- Copyright 2015-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- PowerShell LPeg lexer.
--- Contributed by Jeff Stone.
-
-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 = 'powershell'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local comment = token(l.COMMENT, '#' * l.nonnewline^0)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match({
-  'Begin', 'Break', 'Continue', 'Do', 'Else', 'End', 'Exit', 'For', 'ForEach',
-  'ForEach-Object', 'Get-Date', 'Get-Random', 'If', 'Param', 'Pause',
-  'Powershell', 'Process', 'Read-Host', 'Return', 'Switch', 'While',
-  'Write-Host'
-}, '-', true))
-
--- Comparison Operators.
-local comparison = token(l.KEYWORD, '-' * word_match({
-  'and', 'as', 'band', 'bor', 'contains', 'eq', 'ge', 'gt', 'is', 'isnot', 'le',
-  'like', 'lt', 'match', 'ne', 'nomatch', 'not', 'notcontains', 'notlike', 'or',
-  'replace'
-}, nil, true))
-
--- Parameters.
-local parameter = token(l.KEYWORD, '-' * word_match({
-  'Confirm', 'Debug', 'ErrorAction', 'ErrorVariable', 'OutBuffer',
-  'OutVariable', 'Verbose', 'WhatIf'
-}, nil, true))
-
--- Properties.
-local property = token(l.KEYWORD, '.' * word_match({
-  'day', 'dayofweek', 'dayofyear', 'hour', 'millisecond', 'minute', 'month',
-  'second', 'timeofday', 'year'
-}, nil, true))
-
--- Types.
-local type = token(l.KEYWORD, '[' * word_match({
-  'array', 'boolean', 'byte', 'char', 'datetime', 'decimal', 'double',
-  'hashtable', 'int', 'long', 'single', 'string', 'xml'
-}, nil, true) * ']')
-
--- Variables.
-local variable = token(l.VARIABLE, '$' * (l.digit^1 + l.word +
-                                          l.delimited_range('{}', true, true)))
-
--- Strings.
-local string = token(l.STRING, l.delimited_range('"', true))
-
--- Numbers.
-local number = token(l.NUMBER, l.float + l.integer)
-
--- Operators.
-local operator = token(l.OPERATOR, S('=!<>+-/*^&|~.,:;?()[]{}%`'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'comment', comment},
-  {'keyword', keyword},
-  {'comparison', comparison},
-  {'parameter', parameter},
-  {'property', property},
-  {'type', type},
-  {'variable', variable},
-  {'string', string},
-  {'number', number},
-  {'operator', operator},
-}
-
-M._foldsymbols = {
-  _patterns = {'[{}]'},
-  [l.OPERATOR] = {['{'] = 1, ['}'] = -1}
-}
-
-return M