WIP: using formatter.nvim instead of neoformat (#781)

lua/lv-formatter/init.lua

@@ -0,0 +1,61 @@
+-- autoformat
+if O.format_on_save then
+  require("lv-utils").define_augroups {
+    autoformat = {
+      {
+        "BufWritePost",
+        "*",
+        "FormatWrite",
+      },
+    },
+  }
+end
+
+-- check if formatter has been defined for the language or not
+function formatter_exists(lang_formatter)
+  if lang_formatter == nil then
+    return false
+  end
+  if lang_formatter.exe == nil or lang_formatter.args == nil then
+    return false
+  end
+  return true
+end
+
+-- returns default formatter for given language
+function formatter_return(lang_formatter)
+  return {
+    exe = lang_formatter.exe,
+    args = lang_formatter.args,
+    stdin = not (lang_formatter.stdin ~= nil),
+  }
+end
+
+-- fill a table like this -> {rust: {exe:"sth",args:{"a","b"},stdin=true},go: {}...}
+local formatter_filetypes = {}
+for k, v in pairs(O.lang) do
+  if formatter_exists(v.formatter) then
+    local keys = v.filetypes
+    if keys == nil then
+      keys = {k}
+    end
+    for _, l in pairs(keys) do
+      formatter_filetypes[l] = {
+        function ()
+          return formatter_return(v.formatter)
+        end,
+      }
+    end
+  end
+end
+
+require("formatter").setup {
+  logging = false,
+  filetype = formatter_filetypes,
+}
+
+if not O.format_on_save then
+  vim.cmd [[if exists('#autoformat#BufWritePost')
+	:autocmd! autoformat
+	endif]]
+end