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, 79 deletions

diff --git a/lexers/sql.lua b/lexers/sql.lua
deleted file mode 100644
index 7ea207f..0000000
--- a/lexers/sql.lua
+++ /dev/null
@@ -1,79 +0,0 @@
--- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
--- SQL 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 = 'sql'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Comments.
-local line_comment = (P('--') + '#') * l.nonnewline^0
-local block_comment = '/*' * (l.any - '*/')^0 * P('*/')^-1
-local comment = token(l.COMMENT, line_comment + block_comment)
-
--- Strings.
-local sq_str = l.delimited_range("'")
-local dq_str = l.delimited_range('"')
-local bt_str = l.delimited_range('`')
-local string = token(l.STRING, sq_str + dq_str + bt_str)
-
--- Numbers.
-local number = token(l.NUMBER, l.float + l.integer)
-
--- Keywords.
-local keyword = token(l.KEYWORD, word_match({
-  'add', 'all', 'alter', 'analyze', 'and', 'as', 'asc', 'asensitive', 'before',
-  'between', 'bigint', 'binary', 'blob', 'both', 'by', 'call', 'cascade',
-  'case', 'change', 'char', 'character', 'check', 'collate', 'column',
-  'condition', 'connection', 'constraint', 'continue', 'convert', 'create',
-  'cross', 'current_date', 'current_time', 'current_timestamp', 'current_user',
-  'cursor', 'database', 'databases', 'day_hour', 'day_microsecond',
-  'day_minute', 'day_second', 'dec', 'decimal', 'declare', 'default', 'delayed',
-  'delete', 'desc', 'describe', 'deterministic', 'distinct', 'distinctrow',
-  'div', 'double', 'drop', 'dual', 'each', 'else', 'elseif', 'enclosed',
-  'escaped', 'exists', 'exit', 'explain', 'false', 'fetch', 'float', 'for',
-  'force', 'foreign', 'from', 'fulltext', 'goto', 'grant', 'group', 'having',
-  'high_priority', 'hour_microsecond', 'hour_minute', 'hour_second', 'if',
-  'ignore', 'in', 'index', 'infile', 'inner', 'inout', 'insensitive', 'insert',
-  'int', 'integer', 'interval', 'into', 'is', 'iterate', 'join', 'key', 'keys',
-  'kill', 'leading', 'leave', 'left', 'like', 'limit', 'lines', 'load',
-  'localtime', 'localtimestamp', 'lock', 'long', 'longblob', 'longtext', 'loop',
-  'low_priority', 'match', 'mediumblob', 'mediumint', 'mediumtext', 'middleint',
-  'minute_microsecond', 'minute_second', 'mod', 'modifies', 'natural', 'not',
-  'no_write_to_binlog', 'null', 'numeric', 'on', 'optimize', 'option',
-  'optionally', 'or', 'order', 'out', 'outer', 'outfile', 'precision',
-  'primary', 'procedure', 'purge', 'read', 'reads', 'real', 'references',
-  'regexp', 'rename', 'repeat', 'replace', 'require', 'restrict', 'return',
-  'revoke', 'right', 'rlike', 'schema', 'schemas', 'second_microsecond',
-  'select', 'sensitive', 'separator', 'set', 'show', 'smallint', 'soname',
-  'spatial', 'specific', 'sql', 'sqlexception', 'sqlstate', 'sqlwarning',
-  'sql_big_result', 'sql_calc_found_rows', 'sql_small_result', 'ssl',
-  'starting', 'straight_join', 'table', 'terminated', 'text', 'then',
-  'tinyblob', 'tinyint', 'tinytext', 'to', 'trailing', 'trigger', 'true',
-  'undo', 'union', 'unique', 'unlock', 'unsigned', 'update', 'usage', 'use',
-  'using', 'utc_date', 'utc_time', 'utc_timestamp', 'values', 'varbinary',
-  'varchar', 'varcharacter', 'varying', 'when', 'where', 'while', 'with',
-  'write', 'xor', 'year_month', 'zerofill'
-}, nil, true))
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Operators.
-local operator = token(l.OPERATOR, S(',()'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'keyword', keyword},
-  {'identifier', identifier},
-  {'string', string},
-  {'comment', comment},
-  {'number', number},
-  {'operator', operator},
-}
-
-return M