Initial neovim configuration

lua/plugins/lsp.lua

@@ -0,0 +1,248 @@
+-- Neovim 0.11+ LSP configuration
+-- Uses nvim-lspconfig for server definitions + vim.lsp.enable() API
+
+-- Detect NixOS (Mason doesn't work on NixOS due to FHS issues)
+local is_nixos = vim.fn.filereadable("/etc/NIXOS") == 1
+
+-- Servers to ensure are installed via Mason (non-NixOS only)
+-- On NixOS, install these via extraPackages or per-project devShells
+local mason_ensure_installed = {
+  "lua_ls",       -- Neovim config
+  "nil_ls",       -- Nix
+  "bashls",       -- Shell scripts
+  "jsonls",       -- JSON configs
+}
+
+return {
+  {
+    "nvim-treesitter/nvim-treesitter",
+    build = ":TSUpdate",
+    config = function()
+      require('nvim-treesitter.configs').setup({
+        ensure_installed = {
+          "lua",
+          "c",
+          "cpp",
+          "python",
+          "nix",
+          "rust",
+          "bash",
+          "markdown",
+          "html",
+          "javascript",
+          "css",
+
+          "vim",
+
+          "git_config",
+          "git_rebase",
+          "gitattributes",
+          "gitcommit",
+          "gitignore"
+        },
+        auto_install = true,
+        sync_install = true,
+        highlight = {
+          enable = true,
+        }
+      })
+    end
+  },
+
+  {
+    "m4xshen/autoclose.nvim",
+    config = function()
+      require("autoclose").setup()
+    end
+  },
+
+  {
+    "hrsh7th/nvim-cmp",
+    dependencies = {
+      {
+        "L3MON4D3/LuaSnip",
+        version = "v2.*",
+        build = "make install_jsregexp",
+      },
+      "saadparwaiz1/cmp_luasnip",
+      "hrsh7th/cmp-nvim-lsp"
+    },
+
+    config = function()
+      local cmp = require("cmp")
+      cmp.setup({
+        enabled = function()
+          local context = require("cmp.config.context")
+          if vim.api.nvim_get_mode().mode == "c" then
+            return true
+          else
+            return not context.in_treesitter_capture("comment") and not context.in_syntax_group("comment")
+          end
+        end,
+
+        snippet = {
+          expand = function(args)
+            require('luasnip').lsp_expand(args.body)
+          end
+        },
+
+        mapping = cmp.mapping.preset.insert({
+          ["<C-k>"] = cmp.mapping.select_prev_item(),
+          ["<C-j>"] = cmp.mapping.select_next_item(),
+          ["<C-d>"] = cmp.mapping.scroll_docs(-4),
+          ["<C-f>"] = cmp.mapping.scroll_docs(4),
+          ["<C-e>"] = cmp.mapping.abort(),
+          ["<C-y>"] = cmp.mapping.confirm(),
+          ["<CR>"] = cmp.mapping(function(fallback)
+            fallback()
+          end, { "i", "s" }),
+        }),
+
+        sources = cmp.config.sources({
+          { name = 'nvim_lsp' },
+          { name = 'luasnip' },
+        }, {
+          { name = 'buffer' }
+        }),
+      })
+    end
+  },
+
+  -- Mason: portable LSP installer (disabled on NixOS where it doesn't work)
+  {
+    "williamboman/mason.nvim",
+    enabled = not is_nixos,
+    config = function()
+      require("mason").setup()
+    end
+  },
+  {
+    "williamboman/mason-lspconfig.nvim",
+    enabled = not is_nixos,
+    dependencies = { "williamboman/mason.nvim" },
+    config = function()
+      require("mason-lspconfig").setup({
+        ensure_installed = mason_ensure_installed,
+        automatic_installation = false,  -- Only install what's in ensure_installed
+      })
+    end
+  },
+
+  {
+    "neovim/nvim-lspconfig",
+    dependencies = {
+      "hrsh7th/cmp-nvim-lsp",
+    },
+    config = function()
+      local lspconfig = require('lspconfig')
+
+      -- Get all known server names by scanning lspconfig's lsp directory
+      local function get_all_servers()
+        local servers = {}
+        local lsp_path = vim.fn.stdpath('data') .. '/lazy/nvim-lspconfig/lsp'
+        local files = vim.fn.globpath(lsp_path, '*.lua', false, true)
+        for _, file in ipairs(files) do
+          local server = vim.fn.fnamemodify(file, ':t:r')
+          table.insert(servers, server)
+        end
+        return servers
+      end
+
+      local all_servers = get_all_servers()
+
+      -- local navic = require('nvim-navic')
+      local capabilities = require('cmp_nvim_lsp').default_capabilities()
+
+      -- Global config applied to all servers
+      vim.lsp.config('*', {
+        autostart = false,  -- Don't auto-attach, use <leader>css to start manually
+        capabilities = capabilities,
+        -- on_attach = function(client, bufnr)
+        --   if client.server_capabilities.documentSymbolProvider then
+        --     navic.attach(client, bufnr)
+        --   end
+        -- end,
+      })
+
+      -- Server-specific settings (merged with lspconfig defaults)
+      vim.lsp.config.lua_ls = {
+        settings = {
+          Lua = {
+            diagnostics = {
+              globals = { 'vim' }
+            }
+          }
+        }
+      }
+
+      -- Check if server binary is available
+      local function is_server_installed(config)
+        if config.default_config and config.default_config.cmd then
+          local cmd = config.default_config.cmd[1]
+          return vim.fn.executable(cmd) == 1
+        end
+        return false
+      end
+
+      -- Find and start LSP server(s) for current filetype
+      local function lsp_start_smart()
+        local ft = vim.bo.filetype
+        if ft == '' then
+          vim.notify("No filetype detected", vim.log.levels.WARN)
+          return
+        end
+
+        -- Find all matching servers (filetype match + binary installed)
+        local matching = {}
+        for _, server in ipairs(all_servers) do
+          local ok, config = pcall(require, 'lspconfig.configs.' .. server)
+          if ok and config.default_config and config.default_config.filetypes then
+            if vim.tbl_contains(config.default_config.filetypes, ft) and is_server_installed(config) then
+              table.insert(matching, server)
+            end
+          end
+        end
+
+        -- Sort for consistent ordering
+        table.sort(matching)
+
+        local function start_server(server)
+          vim.lsp.enable(server)  -- Register on-demand
+          vim.cmd('LspStart ' .. server)
+        end
+
+        if #matching == 0 then
+          vim.notify("No LSP server installed for filetype: " .. ft, vim.log.levels.WARN)
+        elseif #matching == 1 then
+          start_server(matching[1])
+        else
+          vim.ui.select(matching, {
+            prompt = "Select LSP server:",
+          }, function(choice)
+            if choice then
+              start_server(choice)
+            end
+          end)
+        end
+      end
+
+      -- LSP keybindings
+      require("which-key").add({
+        { "<leader>cs",  group = "LSP Commands" },
+        { "<leader>cf",  function() vim.lsp.buf.format() end, desc = "Code Format" },
+        { "<leader>csi", ":checkhealth vim.lsp<CR>",          desc = "LSP Info" },
+        { "<leader>csr", ":LspRestart<CR>",                   desc = "LSP Restart" },
+        { "<leader>css", lsp_start_smart,                     desc = "LSP Start" },
+        { "<leader>csx", ":LspStop<CR>",                      desc = "LSP Stop" },
+      })
+    end
+  },
+
+  {
+    "taproot-wizards/bitcoin-script-hints.nvim",
+    dependencies = { "nvim-treesitter/nvim-treesitter" },
+    config = function()
+      require("bitcoin-script-hints").setup()
+    end
+  }
+}