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, 59 deletions

diff --git a/lexers/taskpaper.lua b/lexers/taskpaper.lua
deleted file mode 100644
index 5652f3a..0000000
--- a/lexers/taskpaper.lua
+++ /dev/null
@@ -1,59 +0,0 @@
--- Copyright (c) 2016 Larry Hynes. See LICENSE.
--- Taskpaper LPeg lexer
-
-local l = require('lexer')
-local token = l.token
-local P, R, S = lpeg.P, lpeg.R, lpeg.S
-
-local M = {_NAME = 'taskpaper'}
-
-local delimiter = P('    ') + P('\t')
-
--- Whitespace
-local ws = token(l.WHITESPACE, l.space^1)
-
--- Tags
-local day_tag = token('day_tag', (P('@today') + P('@tomorrow')))
-
-local overdue_tag = token('overdue_tag', P('@overdue'))
-
-local plain_tag = token('plain_tag', P('@') * l.word)
-
-local extended_tag = token('extended_tag',
-                           P('@') * l.word * P('(') *
-                           (l.word + R('09') + P('-'))^1 * P(')'))
-
--- Projects
-local project = token('project',
-                      l.nested_pair(l.starts_line(l.alnum), ':') * l.newline)
-
--- Notes
-local note = token('note', delimiter^1 * l.alnum * l.nonnewline^0)
-
--- Tasks
-local task = token('task', delimiter^1 * P('-') + l.newline)
-
-M._rules = {
-  {'note', note},
-  {'task', task},
-  {'project', project},
-  {'extended_tag', extended_tag},
-  {'day_tag', day_tag},
-  {'overdue_tag', overdue_tag},
-  {'plain_tag', plain_tag},
-  {'whitespace', ws},
-}
-
-M._tokenstyles = {
-  note = l.STYLE_CONSTANT,
-  task = l.STYLE_FUNCTION,
-  project = l.STYLE_TAG,
-  extended_tag = l.STYLE_COMMENT,
-  day_tag = l.STYLE_CLASS,
-  overdue_tag = l.STYLE_PREPROCESSOR,
-  plain_tag = l.STYLE_COMMENT,
-}
-
-M._LEXBYLINE = true
-
-return M