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, 76 deletions

diff --git a/lexers/fish.lua b/lexers/fish.lua
deleted file mode 100644
index 24ee2df..0000000
--- a/lexers/fish.lua
+++ /dev/null
@@ -1,76 +0,0 @@
--- Copyright 2015-2016 Jason Schindler. See LICENSE.
--- Fish (http://fishshell.com/) script 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 = 'fish'}
-
--- Whitespace.
-local ws = token(l.WHITESPACE, l.space^1)
-
--- shebang
-local shebang = token('shebang', '#!/' * l.nonnewline^0)
-
--- Comments.
-local comment = token(l.COMMENT, '#' * l.nonnewline^0)
-
--- Strings.
-local sq_str = l.delimited_range("'", false, true)
-local dq_str = l.delimited_range('"')
-
-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{
-  'alias', 'and', 'begin', 'bg', 'bind', 'block', 'break', 'breakpoint',
-  'builtin', 'case', 'cd', 'command', 'commandline', 'complete', 'contains',
-  'continue', 'count', 'dirh', 'dirs', 'echo', 'else', 'emit', 'end', 'eval',
-  'exec', 'exit', 'fg', 'fish', 'fish_config', 'fish_indent', 'fish_pager',
-  'fish_prompt', 'fish_right_prompt', 'fish_update_completions', 'fishd', 'for',
-  'funced', 'funcsave', 'function', 'functions', 'help', 'history', 'if', 'in',
-  'isatty', 'jobs', 'math', 'mimedb', 'nextd', 'not', 'open', 'or', 'popd',
-  'prevd', 'psub', 'pushd', 'pwd', 'random', 'read', 'return', 'set',
-  'set_color', 'source', 'status', 'switch', 'test', 'trap', 'type', 'ulimit',
-  'umask', 'vared', 'while'
-})
-
--- Identifiers.
-local identifier = token(l.IDENTIFIER, l.word)
-
--- Variables.
-local variable = token(l.VARIABLE,
-                       '$' * l.word + '$' * l.delimited_range('{}', true, true))
-
--- Operators.
-local operator = token(l.OPERATOR, S('=!<>+-/*^&|~.,:;?()[]{}'))
-
-M._rules = {
-  {'whitespace', ws},
-  {'shebang', shebang},
-  {'keyword', keyword},
-  {'identifier', identifier},
-  {'variable', variable},
-  {'string', string},
-  {'comment', comment},
-  {'number', number},
-  {'operator', operator},
-}
-
-M._tokenstyles = {
-  shebang = l.STYLE_LABEL
-}
-
-M._foldsymbols = {
-  _patterns = {'%l+'},
-  [l.KEYWORD] = {
-    begin = 1, ['for'] = 1, ['function'] = 1, ['if'] = 1, switch = 1,
-    ['while'] = 1, ['end'] = -1
-  }
-}
-
-return M