From d2f1bf38edb6c97b58a1d14e0ae3e7017a7345e6 Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 19 Nov 2025 20:59:55 +0000
Subject: [PATCH 1/2] Initial plan


From 1c85a549af429a56dacf20372f4f26037f007e6b Mon Sep 17 00:00:00 2001
From: "copilot-swe-agent[bot]" <198982749+Copilot@users.noreply.github.com>
Date: Wed, 19 Nov 2025 21:03:44 +0000
Subject: [PATCH 2/2] Migrate from ALE to Neovim LSP with completion and
 formatting

Co-authored-by: yangr0 <51311097+yangr0@users.noreply.github.com>
---
 nvim/init.lua                 |  15 +--
 nvim/lua/main/configs/ale.lua |  33 ------
 nvim/lua/main/configs/lsp.lua | 183 ++++++++++++++++++++++++++++++++++
 nvim/lua/main/init.lua        |   2 +-
 nvim/lua/main/packer.lua      |  18 +++-
 5 files changed, 209 insertions(+), 42 deletions(-)
 delete mode 100644 nvim/lua/main/configs/ale.lua
 create mode 100644 nvim/lua/main/configs/lsp.lua

diff --git a/nvim/init.lua b/nvim/init.lua
index 4a9a066..48858c1 100644
--- a/nvim/init.lua
+++ b/nvim/init.lua
@@ -1,21 +1,22 @@
 require("main")
 
 -- DEPENDENCIES
--- neovim
--- vimplug
+-- neovim >= 0.8.0
 -- python3
 -- cargo
--- flake8
--- black
+-- Node.js (for some LSP servers)
+-- pip
 
 -- INSTALL
--- sudo pacman -S neovim python flake8 python-pip (arch)
--- sudo apt install neovim python3 flake8 python3-pip (debian)
+-- sudo pacman -S neovim python nodejs npm (arch)
+-- sudo apt install neovim python3 nodejs npm python3-pip (debian)
 -- pip3 install --user black neovim
 -- curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
 -- export PATH=$PATH:$HOME/.local/bin:$HOME/.cargo/bin
--- rustup component add rust-analyzer
+-- rustup component add rust-analyzer rustfmt clippy
 -- cargo install tree-sitter-cli
 -- git clone --depth=1 https://github.com/iinc0gnit0/dotfiles
 -- mkdir ~/.config
 -- cp -r dotfiles/nvim ~/.config
+-- Open neovim and run :PackerSync to install plugins
+-- LSP servers and formatters will be installed automatically via Mason
diff --git a/nvim/lua/main/configs/ale.lua b/nvim/lua/main/configs/ale.lua
deleted file mode 100644
index 2126187..0000000
--- a/nvim/lua/main/configs/ale.lua
+++ /dev/null
@@ -1,33 +0,0 @@
-vim.g.ale_use_neovim_diagnostics_api = 1
-vim.g.ale_completion_enabled = 1
-vim.g.ale_completion_autoimport = 1
-vim.g.ale_rust_cargo_use_clippy = 1
-vim.g.ale_set_loclist = 0
-vim.g.ale_set_highlights = 1
-vim.g.ale_python_flake8_options = "--ignore=W503,E501"
-vim.g.rustfmt_autosave = 1
-vim.g.ale_c_parse_compile_commands = 1
-vim.g.ale_fix_on_save = 1
-vim.g.ale_set_balloons = 1
-vim.g.ale_linters_explicit = 1
-vim.g.ale_linters = {
-  ["rust"] = {"cargo", "analyzer"},
-  ["python"] = {"flake8"},
-  ["javascript"] = {"eslint"},
-  ["javascriptreact"] = {"eslint"},
-  ["typescript"] = {"eslint"},
-  ["typescriptreact"] = {"eslint"},
-  ["cpp"] = {"clangd"},
-  ["terraform"] = {"checkov"}
-}
-vim.g.ale_fixers = {
-  ["*"] = {"remove_trailing_lines", "trim_whitespace"},
-  ["rust"] = {"rustfmt"},
-  ["python"] = {"black"},
-  ["javascript"] = {"eslint"},
-  ["javascriptreact"] = {"eslint"},
-  ["typescript"] = {"eslint"},
-  ["typescriptreact"] = {"eslint"},
-  ["cpp"] = {"clangtidy", "clang-format"},
-  ["terraform"] = {"terraform"}
-}
diff --git a/nvim/lua/main/configs/lsp.lua b/nvim/lua/main/configs/lsp.lua
new file mode 100644
index 0000000..c0c4270
--- /dev/null
+++ b/nvim/lua/main/configs/lsp.lua
@@ -0,0 +1,183 @@
+-- Mason setup for managing LSP servers
+require("mason").setup()
+require("mason-lspconfig").setup({
+  ensure_installed = {
+    "rust_analyzer",
+    "pyright",
+    "clangd",
+    "ts_ls",
+    "eslint",
+    "terraformls",
+  },
+  automatic_installation = true,
+})
+
+-- Completion setup
+local cmp = require("cmp")
+local luasnip = require("luasnip")
+
+cmp.setup({
+  snippet = {
+    expand = function(args)
+      luasnip.lsp_expand(args.body)
+    end,
+  },
+  mapping = cmp.mapping.preset.insert({
+    ['<C-b>'] = cmp.mapping.scroll_docs(-4),
+    ['<C-f>'] = cmp.mapping.scroll_docs(4),
+    ['<C-Space>'] = cmp.mapping.complete(),
+    ['<C-e>'] = cmp.mapping.abort(),
+    ['<CR>'] = cmp.mapping.confirm({ select = true }),
+    ['<Tab>'] = cmp.mapping(function(fallback)
+      if cmp.visible() then
+        cmp.select_next_item()
+      elseif luasnip.expand_or_jumpable() then
+        luasnip.expand_or_jump()
+      else
+        fallback()
+      end
+    end, { 'i', 's' }),
+    ['<S-Tab>'] = cmp.mapping(function(fallback)
+      if cmp.visible() then
+        cmp.select_prev_item()
+      elseif luasnip.jumpable(-1) then
+        luasnip.jump(-1)
+      else
+        fallback()
+      end
+    end, { 'i', 's' }),
+  }),
+  sources = cmp.config.sources({
+    { name = 'nvim_lsp' },
+    { name = 'luasnip' },
+  }, {
+    { name = 'buffer' },
+    { name = 'path' },
+  })
+})
+
+-- LSP capabilities for autocompletion
+local capabilities = require('cmp_nvim_lsp').default_capabilities()
+
+-- LSP keybindings
+local on_attach = function(client, bufnr)
+  local opts = { buffer = bufnr, noremap = true, silent = true }
+  
+  -- Keybindings
+  vim.keymap.set('n', 'gd', vim.lsp.buf.definition, opts)
+  vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, opts)
+  vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, opts)
+  vim.keymap.set('n', 'gr', vim.lsp.buf.references, opts)
+  vim.keymap.set('n', 'K', vim.lsp.buf.hover, opts)
+  vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, opts)
+  vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, opts)
+  vim.keymap.set('n', '<leader>ca', vim.lsp.buf.code_action, opts)
+  vim.keymap.set('n', '<leader>f', function() vim.lsp.buf.format({ async = true }) end, opts)
+  vim.keymap.set('n', '[d', vim.diagnostic.goto_prev, opts)
+  vim.keymap.set('n', ']d', vim.diagnostic.goto_next, opts)
+  vim.keymap.set('n', '<leader>e', vim.diagnostic.open_float, opts)
+  vim.keymap.set('n', '<leader>q', vim.diagnostic.setloclist, opts)
+end
+
+-- Configure diagnostics
+vim.diagnostic.config({
+  virtual_text = true,
+  signs = true,
+  update_in_insert = false,
+  underline = true,
+  severity_sort = true,
+  float = {
+    border = 'rounded',
+    source = 'always',
+  },
+})
+
+-- Diagnostic signs
+local signs = { Error = "✘", Warn = "▲", Hint = "⚑", Info = "»" }
+for type, icon in pairs(signs) do
+  local hl = "DiagnosticSign" .. type
+  vim.fn.sign_define(hl, { text = icon, texthl = hl, numhl = hl })
+end
+
+-- LSP server configurations
+local lspconfig = require("lspconfig")
+
+-- Rust
+lspconfig.rust_analyzer.setup({
+  on_attach = on_attach,
+  capabilities = capabilities,
+  settings = {
+    ['rust-analyzer'] = {
+      cargo = {
+        allFeatures = true,
+      },
+      checkOnSave = {
+        command = "clippy",
+      },
+    },
+  },
+})
+
+-- Python
+lspconfig.pyright.setup({
+  on_attach = on_attach,
+  capabilities = capabilities,
+})
+
+-- C/C++
+lspconfig.clangd.setup({
+  on_attach = on_attach,
+  capabilities = capabilities,
+})
+
+-- TypeScript/JavaScript
+lspconfig.ts_ls.setup({
+  on_attach = on_attach,
+  capabilities = capabilities,
+})
+
+-- ESLint
+lspconfig.eslint.setup({
+  on_attach = function(client, bufnr)
+    on_attach(client, bufnr)
+    -- Auto-fix on save
+    vim.api.nvim_create_autocmd("BufWritePre", {
+      buffer = bufnr,
+      command = "EslintFixAll",
+    })
+  end,
+  capabilities = capabilities,
+})
+
+-- Terraform
+lspconfig.terraformls.setup({
+  on_attach = on_attach,
+  capabilities = capabilities,
+})
+
+-- Formatting setup with conform.nvim
+require("conform").setup({
+  formatters_by_ft = {
+    rust = { "rustfmt" },
+    python = { "black" },
+    javascript = { "eslint_d" },
+    javascriptreact = { "eslint_d" },
+    typescript = { "eslint_d" },
+    typescriptreact = { "eslint_d" },
+    cpp = { "clang_format" },
+    c = { "clang_format" },
+    terraform = { "terraform_fmt" },
+  },
+  format_on_save = {
+    timeout_ms = 500,
+    lsp_fallback = true,
+  },
+})
+
+-- Also format on save for all files (trim whitespace, etc)
+vim.api.nvim_create_autocmd("BufWritePre", {
+  pattern = "*",
+  callback = function(args)
+    require("conform").format({ bufnr = args.buf })
+  end,
+})
diff --git a/nvim/lua/main/init.lua b/nvim/lua/main/init.lua
index 3903799..3472aa7 100644
--- a/nvim/lua/main/init.lua
+++ b/nvim/lua/main/init.lua
@@ -2,7 +2,7 @@ require("main.packer")
 require("main.set")
 require("main.autocmd")
 require("main.configs.ts")
-require("main.configs.ale")
+require("main.configs.lsp")
 require("main.configs.gruvbox")
 require("main.configs.lualine")
 require("main.configs.indent-blankline")
diff --git a/nvim/lua/main/packer.lua b/nvim/lua/main/packer.lua
index b081325..89a8d5d 100644
--- a/nvim/lua/main/packer.lua
+++ b/nvim/lua/main/packer.lua
@@ -16,7 +16,23 @@ require("packer").startup(function(use)
     "nvim-treesitter/nvim-treesitter",
     run = ":TSUpdate"
   })
-  use("dense-analysis/ale")
+  
+  -- LSP Support
+  use("neovim/nvim-lspconfig")
+  use("williamboman/mason.nvim")
+  use("williamboman/mason-lspconfig.nvim")
+  
+  -- Autocompletion
+  use("hrsh7th/nvim-cmp")
+  use("hrsh7th/cmp-nvim-lsp")
+  use("hrsh7th/cmp-buffer")
+  use("hrsh7th/cmp-path")
+  use("L3MON4D3/LuaSnip")
+  use("saadparwaiz1/cmp_luasnip")
+  
+  -- Formatting
+  use("stevearc/conform.nvim")
+  
   use({
     "ellisonleao/gruvbox.nvim",
     as = "gruvbox"