nvim: moved viper highlighting to separate repository and imported it

.config/nvim/lua/plugins/viper-nvim.lua

@@ -0,0 +1,8 @@
+return {
+  -- highlighting for the viper verification language
+  "tiyn/viper.nvim",
+  event = { "BufReadPre *.vpr", "FileType viper" },
+  config = function()
+    require("viper").setup()
+  end,
+}

.config/nvim/lua/style.lua

@@ -129,27 +129,3 @@ vim.opt_local.colorcolumn = "+" .. vim.fn.join(vim.fn.range(0, 254), ",+")
 vim.o.list = true
 vim.opt.listchars:append("space:" .. Space_sign)
 vim.opt.listchars:append("eol:" .. Return_sign)
-
--- custom viper-highlighting
-local viper_group = vim.api.nvim_create_augroup("ViperSyntax", { clear = true })
-vim.api.nvim_create_autocmd("FileType", {
-  group = viper_group,
-  pattern = "viper",
-  callback = function()
-    vim.cmd("syntax enable")
-    vim.cmd([[
-      syntax keyword viperKeyword method function returns requires ensures invariant
-      syntax keyword viperKeyword if else while var field predicate
-      syntax keyword viperKeyword assert
-
-      syntax keyword viperType Int Bool Ref
-
-      syntax match viperComment "//.*$"
-      syntax match viperNumber "\v\d+"
-    ]])
-    vim.api.nvim_set_hl(0, "viperKeyword", { link = "Keyword" })
-    vim.api.nvim_set_hl(0, "viperType", { link = "Type" })
-    vim.api.nvim_set_hl(0, "viperComment", { link = "Comment" })
-    vim.api.nvim_set_hl(0, "viperNumber", { link = "Number" })
-  end,
-})