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, 78 insertions, 0 deletions

diff --git a/lua/lexers/pascal.lua b/lua/lexers/pascal.lua
new file mode 100644
index 0000000..6cb6a2e
--- /dev/null
+++ b/lua/lexers/pascal.lua
@@ -0,0 +1,78 @@
+-- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
+-- Pascal 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 = 'pascal'}
+
+-- Whitespace.
+local ws = token(l.WHITESPACE, l.space^1)
+
+-- Comments.
+local line_comment = '//' * l.nonnewline_esc^0
+local bblock_comment = '{' * (l.any - '}')^0 * P('}')^-1
+local pblock_comment = '(*' * (l.any - '*)')^0 * P('*)')^-1
+local comment = token(l.COMMENT, line_comment + bblock_comment + pblock_comment)
+
+-- Strings.
+local string = token(l.STRING, S('uUrR')^-1 *
+                               l.delimited_range("'", true, true))
+
+-- Numbers.
+local number = token(l.NUMBER, (l.float + l.integer) * S('LlDdFf')^-1)
+
+-- Keywords.
+local keyword = token(l.KEYWORD, word_match({
+  'and', 'array', 'as', 'at', 'asm', 'begin', 'case', 'class', 'const',
+  'constructor', 'destructor', 'dispinterface', 'div', 'do', 'downto', 'else',
+  'end', 'except', 'exports', 'file', 'final', 'finalization', 'finally', 'for',
+  'function', 'goto', 'if', 'implementation', 'in', 'inherited',
+  'initialization', 'inline', 'interface', 'is', 'label', 'mod', 'not',
+  'object', 'of', 'on', 'or', 'out', 'packed', 'procedure', 'program',
+  'property', 'raise', 'record', 'repeat', 'resourcestring', 'set', 'sealed',
+  'shl', 'shr', 'static', 'string', 'then', 'threadvar', 'to', 'try', 'type',
+  'unit', 'unsafe', 'until', 'uses', 'var', 'while', 'with', 'xor',
+  'absolute', 'abstract', 'assembler', 'automated', 'cdecl', 'contains',
+  'default', 'deprecated', 'dispid', 'dynamic', 'export', 'external', 'far',
+  'forward', 'implements', 'index', 'library', 'local', 'message', 'name',
+  'namespaces', 'near', 'nodefault', 'overload', 'override', 'package',
+  'pascal', 'platform', 'private', 'protected', 'public', 'published', 'read',
+  'readonly', 'register', 'reintroduce', 'requires', 'resident', 'safecall',
+  'stdcall', 'stored', 'varargs', 'virtual', 'write', 'writeln', 'writeonly',
+  'false', 'nil', 'self', 'true'
+}, nil, true))
+
+-- Functions.
+local func = token(l.FUNCTION, word_match({
+  'chr', 'ord', 'succ', 'pred', 'abs', 'round', 'trunc', 'sqr', 'sqrt',
+  'arctan', 'cos', 'sin', 'exp', 'ln', 'odd', 'eof', 'eoln'
+}, nil, true))
+
+-- Types.
+local type = token(l.TYPE, word_match({
+  'shortint', 'byte', 'char', 'smallint', 'integer', 'word', 'longint',
+  'cardinal', 'boolean', 'bytebool', 'wordbool', 'longbool', 'real', 'single',
+  'double', 'extended', 'comp', 'currency', 'pointer'
+}, nil, true))
+
+-- Identifiers.
+local identifier = token(l.IDENTIFIER, l.word)
+
+-- Operators.
+local operator = token(l.OPERATOR, S('.,;^@:=<>+-/*()[]'))
+
+M._rules = {
+  {'whitespace', ws},
+  {'keyword', keyword},
+  {'function', func},
+  {'type', type},
+  {'string', string},
+  {'identifier', identifier},
+  {'comment', comment},
+  {'number', number},
+  {'operator', operator},
+}
+
+return M