nvim: added viper highlighting

.config/nvim/lua/style.lua

@@ -129,3 +129,27 @@ 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,
+})