From 32ff674cefd8142f4e8c210b6fb3bd23eef7ab84 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Matej=20Jane=C5=BEi=C4=8D?= <janezic.mj@gmail.com>
Date: Tue, 7 Oct 2025 23:45:38 +0200
Subject: [PATCH] feat: add lsp config and neovim/nvim-lspconfig

---
 after/lsp/lua_ls.lua | 62 ++++++++++++++++++++++++++++++++++++++++++++
 lua/plugins/lsp.lua  | 50 +++++++++++++++++++++++++++++++++++
 2 files changed, 112 insertions(+)
 create mode 100644 after/lsp/lua_ls.lua

diff --git a/after/lsp/lua_ls.lua b/after/lsp/lua_ls.lua
new file mode 100644
index 0000000..26bb69d
--- /dev/null
+++ b/after/lsp/lua_ls.lua
@@ -0,0 +1,62 @@
+local filter_line_locations = function(locations)
+    local present, res = {}, {}
+    for _, l in ipairs(locations) do
+        local t = present[l.filename] or {}
+        if not t[l.lnum] then
+            table.insert(res, l)
+            t[l.lnum] = true
+        end
+        present[l.filename] = t
+    end
+    return res
+end
+
+local show_location = function(location)
+    local buf_id = location.bufnr or vim.fn.bufadd(location.filename)
+    vim.bo[buf_id].buflisted = true
+    vim.api.nvim_win_set_buf(0, buf_id)
+    vim.api.nvim_win_set_cursor(0, { location.lnum, location.col - 1 })
+    vim.cmd("normal! zv")
+end
+
+local on_list = function(args)
+    local items = filter_line_locations(args.items)
+    if #items > 1 then
+        vim.fn.setqflist({}, " ", { title = "LSP locations", items = items })
+        return vim.cmd("botright copen")
+    end
+    show_location(items[1])
+end
+
+local luals_unique_definition = function()
+    return vim.lsp.buf.definition({ on_list = on_list })
+end
+
+return {
+    on_attach = function(client, buf_id)
+        -- Reduce unnecessarily long list of completion triggers for better
+        -- 'mini.completion' experience
+        client.server_capabilities.completionProvider.triggerCharacters =
+            { ".", ":", "#", "(" }
+
+        -- Override global "Go to source" mapping with dedicated buffer-local
+        local opts = { buffer = buf_id, desc = "Lua source definition" }
+        vim.keymap.set("n", "<Leader>ls", luals_unique_definition, opts)
+    end,
+    settings = {
+        Lua = {
+            runtime = { version = "LuaJIT", path = vim.split(package.path, ";") },
+            diagnostics = {
+                -- Don't analyze whole workspace, as it consumes too much CPU and RAM
+                workspaceDelay = -1,
+            },
+            workspace = {
+                -- Don't analyze code from submodules
+                ignoreSubmodules = true,
+                -- Add Neovim's methods for easier code writing
+                library = { vim.env.VIMRUNTIME },
+            },
+            telemetry = { enable = false },
+        },
+    },
+}
diff --git a/lua/plugins/lsp.lua b/lua/plugins/lsp.lua
index efa064b..8a18536 100644
--- a/lua/plugins/lsp.lua
+++ b/lua/plugins/lsp.lua
@@ -13,4 +13,54 @@ later(function()
         "stylua",
         "lua_ls",
     })
+
+    vim.api.nvim_create_autocmd("LspAttach", {
+        callback = function(args)
+            local client = vim.lsp.get_client_by_id(args.data.client_id)
+            local bufnr = args.buf
+
+            ---@param keys string
+            ---@param func function
+            ---@param desc string
+            ---@param modes? string | table
+            local map_lsp = function(keys, func, desc, modes)
+                modes = modes or "n"
+                vim.keymap.set(
+                    modes,
+                    "<leader>l" .. keys,
+                    func,
+                    { buffer = bufnr, desc = "lsp: " .. desc }
+                )
+            end
+
+            local fzf = require("fzf-lua")
+
+            map_lsp("d", fzf.lsp_definitions, "definition")
+            map_lsp("D", fzf.lsp_declarations, "declaration")
+            map_lsp("i", fzf.lsp_implementations, "implementation")
+            map_lsp("r", fzf.lsp_references, "references")
+
+            map_lsp("t", fzf.lsp_typedefs, "type definition")
+
+            map_lsp("a", fzf.lsp_code_actions, "code action", { "n", "x" })
+            map_lsp("n", vim.lsp.buf.rename, "rename")
+
+            map_lsp("W", fzf.lsp_live_workspace_symbols, "workspace symbols")
+            map_lsp("L", fzf.lsp_document_symbols, "document symbols")
+
+            map_lsp("w", fzf.lsp_workspace_diagnostics, "workspace diagnostics")
+            map_lsp("l", fzf.lsp_document_diagnostics, "document diagnostics")
+
+            map_lsp(
+                "f",
+                function() vim.lsp.buf.format({ timeout_ms = 2000 }) end,
+                "format"
+            )
+
+            -- inlay hints
+            if client and client.server_capabilities.inlayHintProvider then
+                vim.lsp.inlay_hint.enable(true, { bufnr = bufnr })
+            end
+        end,
+    })
 end)