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, 166 insertions, 0 deletions

diff --git a/lua/lexers/css.lua b/lua/lexers/css.lua
new file mode 100644
index 0000000..cb3e26b
--- /dev/null
+++ b/lua/lexers/css.lua
@@ -0,0 +1,166 @@
+-- Copyright 2006-2016 Mitchell mitchell.att.foicica.com. See LICENSE.
+-- CSS LPeg lexer.
+
+local l = require('lexer')
+local token, word_match = l.token, l.word_match
+local P, R, S, V = lpeg.P, lpeg.R, lpeg.S, lpeg.V
+
+local M = {_NAME = 'css'}
+
+-- Whitespace.
+local ws = token(l.WHITESPACE, l.space^1)
+
+-- Comments.
+local comment = token(l.COMMENT, '/*' * (l.any - '*/')^0 * P('*/')^-1)
+
+-- Strings.
+local sq_str = l.delimited_range("'")
+local dq_str = l.delimited_range('"')
+local string = token(l.STRING, sq_str + dq_str)
+
+-- Numbers.
+local number = token(l.NUMBER, l.digit^1)
+
+-- Keywords.
+local css1_property = word_match({
+  'color', 'background-color', 'background-image', 'background-repeat',
+  'background-attachment', 'background-position', 'background', 'font-family',
+  'font-style', 'font-variant', 'font-weight', 'font-size', 'font',
+  'word-spacing', 'letter-spacing', 'text-decoration', 'vertical-align',
+  'text-transform', 'text-align', 'text-indent', 'line-height', 'margin-top',
+  'margin-right', 'margin-bottom', 'margin-left', 'margin', 'padding-top',
+  'padding-right', 'padding-bottom', 'padding-left', 'padding',
+  'border-top-width', 'border-right-width', 'border-bottom-width',
+  'border-left-width', 'border-width', 'border-top', 'border-right',
+  'border-bottom', 'border-left', 'border', 'border-color', 'border-style',
+  'width', 'height', 'float', 'clear', 'display', 'white-space',
+  'list-style-type', 'list-style-image', 'list-style-position', 'list-style'
+}, '-')
+local css1_value = word_match({
+  'auto', 'none', 'normal', 'italic', 'oblique', 'small-caps', 'bold', 'bolder',
+  'lighter', 'xx-small', 'x-small', 'small', 'medium', 'large', 'x-large',
+  'xx-large', 'larger', 'smaller', 'transparent', 'repeat', 'repeat-x',
+  'repeat-y', 'no-repeat', 'scroll', 'fixed', 'top', 'bottom', 'left', 'center',
+  'right', 'justify', 'both', 'underline', 'overline', 'line-through', 'blink',
+  'baseline', 'sub', 'super', 'text-top', 'middle', 'text-bottom', 'capitalize',
+  'uppercase', 'lowercase', 'thin', 'medium', 'thick', 'dotted', 'dashed',
+  'solid', 'double', 'groove', 'ridge', 'inset', 'outset', 'block', 'inline',
+  'list-item', 'pre', 'no-wrap', 'inside', 'outside', 'disc', 'circle',
+  'square', 'decimal', 'lower-roman', 'upper-roman', 'lower-alpha',
+  'upper-alpha', 'aqua', 'black', 'blue', 'fuchsia', 'gray', 'green', 'lime',
+  'maroon', 'navy', 'olive', 'purple', 'red', 'silver', 'teal', 'white',
+  'yellow'
+}, '-')
+local css2_property = word_match({
+  'border-top-color', 'border-right-color', 'border-bottom-color',
+  'border-left-color', 'border-color', 'border-top-style', 'border-right-style',
+  'border-bottom-style', 'border-left-style', 'border-style', 'top', 'right',
+  'bottom', 'left', 'position', 'z-index', 'direction', 'unicode-bidi',
+  'min-width', 'max-width', 'min-height', 'max-height', 'overflow', 'clip',
+  'visibility', 'content', 'quotes', 'counter-reset', 'counter-increment',
+  'marker-offset', 'size', 'marks', 'page-break-before', 'page-break-after',
+  'page-break-inside', 'page', 'orphans', 'widows', 'font-stretch',
+  'font-size-adjust', 'unicode-range', 'units-per-em', 'src', 'panose-1',
+  'stemv', 'stemh', 'slope', 'cap-height', 'x-height', 'ascent', 'descent',
+  'widths', 'bbox', 'definition-src', 'baseline', 'centerline', 'mathline',
+  'topline', 'text-shadow', 'caption-side', 'table-layout', 'border-collapse',
+  'border-spacing', 'empty-cells', 'speak-header', 'cursor', 'outline',
+  'outline-width', 'outline-style', 'outline-color', 'volume', 'speak',
+  'pause-before', 'pause-after', 'pause', 'cue-before', 'cue-after', 'cue',
+  'play-during', 'azimuth', 'elevation', 'speech-rate', 'voice-family', 'pitch',
+  'pitch-range', 'stress', 'richness', 'speak-punctuation', 'speak-numeral'
+}, '-')
+local css2_value = word_match({
+  'inherit', 'run-in', 'compact', 'marker', 'table', 'inline-table',
+  'table-row-group', 'table-header-group', 'table-footer-group', 'table-row',
+  'table-column-group', 'table-column', 'table-cell', 'table-caption', 'static',
+  'relative', 'absolute', 'fixed', 'ltr', 'rtl', 'embed', 'bidi-override',
+  'visible', 'hidden', 'scroll', 'collapse', 'open-quote', 'close-quote',
+  'no-open-quote', 'no-close-quote', 'decimal-leading-zero', 'lower-greek',
+  'lower-latin', 'upper-latin', 'hebrew', 'armenian', 'georgian',
+  'cjk-ideographic', 'hiragana', 'katakana', 'hiragana-iroha', 'katakana-iroha',
+  'landscape', 'portrait', 'crop', 'cross', 'always', 'avoid', 'wider',
+  'narrower', 'ultra-condensed', 'extra-condensed', 'condensed',
+  'semi-condensed', 'semi-expanded', 'expanded', 'extra-expanded',
+  'ultra-expanded', 'caption', 'icon', 'menu', 'message-box', 'small-caption',
+  'status-bar', 'separate', 'show', 'hide', 'once', 'crosshair', 'default',
+  'pointer', 'move', 'text', 'wait', 'help', 'e-resize', 'ne-resize',
+  'nw-resize', 'n-resize', 'se-resize', 'sw-resize', 's-resize', 'w-resize',
+  'ActiveBorder', 'ActiveCaption', 'AppWorkspace', 'Background', 'ButtonFace',
+  'ButtonHighlight', 'ButtonShadow', 'InactiveCaptionText', 'ButtonText',
+  'CaptionText', 'GrayText', 'Highlight', 'HighlightText', 'InactiveBorder',
+  'InactiveCaption', 'InfoBackground', 'InfoText', 'Menu', 'MenuText',
+  'Scrollbar', 'ThreeDDarkShadow', 'ThreeDFace', 'ThreeDHighlight',
+  'ThreeDLightShadow', 'ThreeDShadow', 'Window', 'WindowFrame', 'WindowText',
+  'silent', 'x-soft', 'soft', 'medium', 'loud', 'x-loud', 'spell-out', 'mix',
+  'left-side', 'far-left', 'center-left', 'center-right', 'far-right',
+  'right-side', 'behind', 'leftwards', 'rightwards', 'below', 'level', 'above',
+  'higher', 'lower', 'x-slow', 'slow', 'medium', 'fast', 'x-fast', 'faster',
+  'slower', 'male', 'female', 'child', 'x-low', 'low', 'high', 'x-high', 'code',
+  'digits', 'continous'
+}, '-')
+local property = token(l.KEYWORD, css1_property + css2_property)
+local value = token('value', css1_value + css2_value)
+local keyword = property + value
+
+-- Identifiers.
+local identifier = token(l.IDENTIFIER, l.alpha * (l.alnum + S('_-'))^0)
+
+-- Operators.
+local operator = token(l.OPERATOR, S('~!#*>+=|.,:;()[]{}'))
+
+-- At rule.
+local at_rule = token('at_rule', P('@') * word_match{
+  'charset', 'font-face', 'media', 'page', 'import'
+})
+
+-- Colors.
+local xdigit = l.xdigit
+local hex_color = '#' * xdigit * xdigit * xdigit * (xdigit * xdigit * xdigit)^-1
+local color_name = word_match{
+  'aqua', 'black', 'blue', 'fuchsia', 'gray', 'green', 'lime', 'maroon', 'navy',
+  'olive', 'orange', 'purple', 'red', 'silver', 'teal', 'white', 'yellow'
+}
+local color = token('color', hex_color + color_name)
+
+-- Pseudo.
+local pseudo = token(l.CONSTANT, word_match({
+  -- Pseudo elements.
+  'first-line', 'first-letter', 'before', 'after',
+  -- Pseudo classes.
+  'first-child', 'link', 'visited', 'hover', 'active', 'focus', 'lang',
+}, '-'))
+
+-- Units.
+local unit = token('unit', word_match{
+  'em', 'ex', 'px', 'pt', 'pc', 'in', 'ft', 'mm', 'cm', 'kHz', 'Hz', 'deg',
+  'rad', 'grad', 'ms', 's'
+} + '%')
+
+M._rules = {
+  {'whitespace', ws},
+  {'keyword', keyword},
+  {'pseudo', pseudo},
+  {'color', color},
+  {'identifier', identifier},
+  {'string', string},
+  {'comment', comment},
+  {'number', number * unit^-1},
+  {'operator', operator},
+  {'at_rule', at_rule},
+}
+
+M._tokenstyles = {
+  unit = l.STYLE_LABEL,
+  value = l.STYLE_CONSTANT,
+  color = l.STYLE_NUMBER,
+  at_rule = l.STYLE_PREPROCESSOR
+}
+
+M._foldsymbols = {
+  _patterns = {'[{}]', '/%*', '%*/'},
+  [l.OPERATOR] = {['{'] = 1, ['}'] = -1},
+  [l.COMMENT] = {['/*'] = 1, ['*/'] = -1}
+}
+
+return M