Add some C/C++ snippets

snippets/c.lua

@@ -0,0 +1,25 @@
+# C LuaSnip Snippets
+
+local luasnip = require('luasnip')
+local snip = luasnip.snippet
+local text = luasnip.text_node
+local insert = luasnip.insert_node
+local func = luasnip.function_node
+local key = require("luasnip.nodes.key_indexer").new_key
+
+local snippets = {
+  snip('#include', {
+    text('#include '),
+    insert(1, '<', { key = 'open' }),
+    insert(2, 'header'),
+    func(function(args)
+      if args[1][1] == '<' then
+        return '>'
+      else
+        return '"'
+      end
+    end, key('open')),
+  }),
+}
+
+return snippets