Add vis editor syntax highlighter

Replace tabs with spaces

syntax-highlight/vis/README.md

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+# hush.lua
+
+Vis editor syntax highlighting for _Hush_.
+
+## Installation
+
+Copy hush.lua into $XDG\_CONFIG\_HOME/vis/lexers, copy hush\_detect.lua into $XDG\_CONFIG\_HOME/vis, and add require("hush\_detect") to your visrc.

syntax-highlight/vis/hush.lua

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+-- ? 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 = 'hush'}
+
+local comment = token(l.COMMENT, '#' * l.nonnewline_esc^0)
+
+local constant = token(l.CONSTANT, word_match{
+  'true', 'false',
+})
+
+local identifier = token(l.IDENTIFIER, l.word)
+
+local keyword = token(l.KEYWORD, word_match{
+  'let', 'if', 'then', 'else', 'elseif', 'end', 'for', 'in', 'do', 'while',
+  'function', 'return', 'not', 'and', 'or', 'true', 'false', 'nil', 'break',
+  'self',
+})
+
+local operator = token(l.OPERATOR, word_match{
+  'and', 'or', 'not',
+} + S('+-/*%<>!=[]'))
+
+local number = token(l.NUMBER, l.float + l.integer)
+
+local sq_str = l.delimited_range("'", true)
+local dq_str = l.delimited_range('"', true)
+local string = token(l.STRING, sq_str + dq_str)
+
+local type = token(l.TYPE, word_match{
+  'int', 'char', 'float', 'string', 'bool', 'array', 'dict',
+})
+
+local ws = token(l.WHITESPACE, l.space^1)
+
+M._rules = {
+  {'constant', constant},
+  {'comment', comment},
+  {'keyword', keyword},
+  {'number', number},
+  {'operator', operator},
+  {'string', string},
+  {'type', type},
+  {'whitespace', ws},
+  {'identifier', identifier},
+}
+
+return M

syntax-highlight/vis/hush_detect.lua

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+vis.ftdetect.filetypes.hush = {
+  ext = { "%.hsh$" },
+}