Add syntax and completion files

Syntax for vim (very minimalistic) and completions for zsh

share/Makefile

@@ -0,0 +1,8 @@
+PREFIX?=	/usr/local
+
+all:
+	@echo 'run `${MAKE} install` to install additional files'
+
+install:
+	install -m 644 completion-zsh.sh "${DESTDIR}${PREFIX}/share/zsh/site-functions/_omnilinter"
+	install -m 644 syntax.vim "${DESTDIR}${PREFIX}/share/vim/vimfiles/syntax/omnilinter.vim"

share/completion-zsh.sh

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+#compdef omnilinter
+
+_arguments \
+  '*'{-c+,--config=}'[Path(s) to configuration file(s)]:file:_files' \
+  '(-t --tags)'{-t+,--tags=}'[Only process rules tagged with these values]:tag:' \
+  '--skip-tags=[Ignore rules tagged with these values]:tag:' \
+  '(-f --format)'{-f+,--format=}'[Output format]:format:(by-root full-paths by-rule by-path json)' \
+  '--color=[Coloring]:mode:(auto always never)' \
+  '--palette=[Palette to use for rule coloring]:palette:(none simple severity true-color)' \
+  '--error-exitcode=[If any matches are found, exit with given code]:exit code:' \
+  {-j+,--jobs=}'[Number of target directories to process simultaneously]:number:' \
+  '(* -)'{-h,--help}'[Print help]' \
+  '(* -)'{-V,--version}'[Print version]' \
+  '*:directory:_files -/'

share/syntax.vim

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+" Vim syntax file
+"   Language: omnilinter config file
+" Maintainer: Dmitry Marakasov <[email protected]>
+
+if exists("b:current_syntax")
+  finish
+endif
+
+syn keyword omnilinterTodo      contained TODO FIXME XXX
+syn match   omnilinterIgnore    contained "omnilinter: ignore"
+syn match   omnilinterComment   "#.*" contains=omnilinterIgnore,omnilinterTodo,@Spell
+syn match   omnilinterTag       "[^ \t,]\+" contained
+
+syn region  omnilinterRuleTitle     skipwhite keepend start=+\[+ skip=+\]\]+ end=+\]+ 
+syn keyword omnilinterDirective     tags files nofiles match nomatch size lines
+syn region  omnilinterDirectiveTags matchgroup=omnilinterDirective start=+^\s*tags+ skip=+,+ end=+\s*$+ contains=omnilinterTag
+
+hi def link omnilinterComment       Comment
+hi def link omnilinterRuleTitle     Keyword
+hi def link omnilinterDirective     Identifier
+hi def link omnilinterIgnore        SpecialComment
+hi def link omnilinterTodo          Todo
+hi def link omnilinterTag           String
+
+let b:current_syntax = "omnilinter"