Update runtime files

runtime/syntax/scdoc.vim

@@ -0,0 +1,52 @@
+" Syntax file for scdoc files
+" Maintainer: Gregory Anders <greg@gpanders.com>
+" Last Updated: 2021-08-04
+
+if exists('b:current_syntax')
+    finish
+endif
+let b:current_syntax = 'scdoc'
+
+syntax match scdocFirstLineError "\%^.*$"
+syntax match scdocFirstLineValid "\%^\S\+(\d[0-9A-Za-z]*)\%(\s\+\"[^"]*\"\%(\s\+\"[^"]*\"\)\=\)\=$"
+
+syntax region scdocCommentError start="^;\S" end="$" keepend
+syntax region scdocComment start="^; " end="$" keepend
+
+syntax region scdocHeaderError start="^#\{3,}" end="$" keepend
+syntax region scdocHeader start="^#\{1,2}" end="$" keepend
+
+syntax match scdocIndentError "^[ ]\+"
+
+syntax match scdocLineBreak "++$"
+
+syntax match scdocOrderedListMarker "^\s*\.\%(\s\+\S\)\@="
+syntax match scdocListMarker "^\s*-\%(\s\+\S\)\@="
+
+syntax match scdocTableStartMarker "^[\[|\]][\[\-\]]"
+syntax match scdocTableMarker "^[|:][\[\-\] ]"
+
+syntax region scdocBold concealends matchgroup=scdocBoldDelimiter start="\\\@<!\*" end="\\\@<!\*"
+syntax region scdocUnderline concealends matchgroup=scdocUnderlineDelimiter start="\<\\\@<!_" end="\\\@<!_\>"
+syntax region scdocPre matchgroup=scdocPreDelimiter start="^\t*```" end="^\t*```"
+
+hi link scdocFirstLineValid     Comment
+hi link scdocComment            Comment
+hi link scdocHeader             Title
+hi link scdocOrderedListMarker  Statement
+hi link scdocListMarker         scdocOrderedListMarker
+hi link scdocLineBreak          Special
+hi link scdocTableMarker        Statement
+hi link scdocTableStartMarker   scdocTableMarker
+
+hi link scdocFirstLineError     Error
+hi link scdocCommentError       Error
+hi link scdocHeaderError        Error
+hi link scdocIndentError        Error
+
+hi link scdocPreDelimiter       Delimiter
+
+hi scdocBold term=bold cterm=bold gui=bold
+hi scdocUnderline term=underline cterm=underline gui=underline
+hi link scdocBoldDelimiter scdocBold
+hi link scdocUnderlineDelimiter scdocUnderline