Add lspsaga and configure it with our current lsp setup

lua/core/plugin_config/lsp_config.lua

@@ -1,22 +1,27 @@
-require("mason").setup()
 require("mason-lspconfig").setup({
   ensure_installed = { "sumneko_lua", "solargraph" }
 })
 
-local on_attach = function(_, _)
-  vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, {})
-  vim.keymap.set('n', '<leader>ca', vim.lsp.buf.code_action, {})
+local capabilities = require('cmp_nvim_lsp').default_capabilities(vim.lsp.protocol.make_client_capabilities())
 
-  vim.keymap.set('n', 'gd', vim.lsp.buf.definition, {})
-  vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, {})
-  vim.keymap.set('n', 'gr', require('telescope.builtin').lsp_references, {})
-  vim.keymap.set('n', 'K', vim.lsp.buf.hover, {})
-end
+local saga = require 'lspsaga'
+saga.init_lsp_saga({
+  code_action_icon = "💡",
+  symbol_in_winbar = {
+    in_custom = false,
+    enable = true,
+    separator = ' ',
+    show_file = true,
+    file_formatter = ""
+  },
+})
 
-local capabilities = require('cmp_nvim_lsp').default_capabilities()
+vim.keymap.set("n", "gd", "<cmd>Lspsaga lsp_finder<CR>", { silent = true })
+vim.keymap.set('n', 'K', '<Cmd>Lspsaga hover_doc<cr>', { silent = true })
+vim.keymap.set({"n","v"}, "<leader>ca", "<cmd>Lspsaga code_action<CR>", { silent = true })
+vim.keymap.set("n", "<leader>rn", "<cmd>Lspsaga rename<CR>", { silent = true })
 
 require("lspconfig").sumneko_lua.setup {
-  on_attach = on_attach,
   capabilities = capabilities,
   settings = {
     Lua = {
@@ -34,6 +39,5 @@ require("lspconfig").sumneko_lua.setup {
 }
 
 require("lspconfig").solargraph.setup {
-  on_attach = on_attach,
   capabilities = capabilities,
 }

lua/core/plugins.lua

@@ -35,7 +35,9 @@ return require('packer').startup(function(use)
     "williamboman/mason.nvim",
     "williamboman/mason-lspconfig.nvim",
     "neovim/nvim-lspconfig",
+    "glepnir/lspsaga.nvim",
   }
+
   use {
 	  'nvim-telescope/telescope.nvim',
 	  tag = '0.1.0',