Add org mode, close #706

syntax/outline.vim

@@ -0,0 +1,43 @@
+if polyglot#init#is_disabled(expand('<sfile>:p'), 'org', 'syntax/outline.vim')
+  finish
+endif
+
+" Vim syntax file for GNU Emacs' Outline mode
+"
+" Maintainer:   Alex Vear <av@axvr.io>
+" License:      Vim (see `:help license`)
+" Location:     syntax/outline.vim
+" Website:      https://github.com/axvr/org.vim
+" Last Change:  2019-09-28
+"
+" Reference Specification: GNU Emacs Manual, section 'Outline Mode'
+"   GNU Info: `$ info Emacs Outline Mode`
+"   Web: <https://www.gnu.org/software/emacs/manual/html_node/emacs/Outline-Mode.html>
+
+if exists('b:current_syntax')
+    finish
+endif
+
+" Enable spell check for non syntax highlighted text
+syntax spell toplevel
+
+
+" Headings
+syntax match outlineHeading1 /^\s*\*\{1}\s\+.*$/ keepend contains=@Spell
+syntax match outlineHeading2 /^\s*\*\{2}\s\+.*$/ keepend contains=@Spell
+syntax match outlineHeading3 /^\s*\*\{3}\s\+.*$/ keepend contains=@Spell
+syntax match outlineHeading4 /^\s*\*\{4}\s\+.*$/ keepend contains=@Spell
+syntax match outlineHeading5 /^\s*\*\{5}\s\+.*$/ keepend contains=@Spell
+syntax match outlineHeading6 /^\s*\*\{6,}\s\+.*$/ keepend contains=@Spell
+
+syntax cluster outlineHeadingGroup contains=outlineHeading1,outlineHeading2,outlineHeading3,outlineHeading4,outlineHeading5,outlineHeading6
+
+hi def link outlineHeading1 Title
+hi def link outlineHeading2 outlineHeading1
+hi def link outlineHeading3 outlineHeading2
+hi def link outlineHeading4 outlineHeading3
+hi def link outlineHeading5 outlineHeading4
+hi def link outlineHeading6 outlineHeading5
+
+
+let b:current_syntax = 'outline'