4 files changed, 170 insertions, 0 deletions
diff --git a/.config/nvim/lua/custom/configs/language-servers.lua b/.config/nvim/lua/custom/configs/language-servers.lua
new file mode 100644
index 0000000..78dd6e5
--- /dev/null
+++ b/.config/nvim/lua/custom/configs/language-servers.lua
@@ -0,0 +1,16 @@
+-- NOTE: A list of language servers (and potentially their config)
+-- Accepts either true to enable, false to disable or a table with settings
+return {
+    lua_ls = true,                 -- lua
+    clangd = true,                 -- C/C++
+    gradle_ls = true,              -- java package manager
+    jdtls = true,                  -- java eclipse lsp
+    kotlin_language_server = true, -- kotlin
+    pyright = true,                -- python
+    rust_analyzer = true,          -- rust
+    bashls = true,                 -- bash
+    taplo = true,                  -- toml
+    lemminx = true,                -- xml
+    yamlls = true,                 -- yaml
+    jsonls = true,                 -- json
+}
diff --git a/.config/nvim/lua/custom/configs/lsp-keymaps.lua b/.config/nvim/lua/custom/configs/lsp-keymaps.lua
new file mode 100644
index 0000000..f43a03e
--- /dev/null
+++ b/.config/nvim/lua/custom/configs/lsp-keymaps.lua
@@ -0,0 +1,58 @@
+local severity = vim.diagnostic.severity
+local function next_diagnostic(diagnostic_severity)
+    return function()
+        require('lspsaga.diagnostic'):goto_next({ severity = diagnostic_severity })
+    end
+end
+local function prev_diagnostic(diagnostic_severity)
+    return function()
+        require('lspsaga.diagnostic'):goto_prev({ severity = diagnostic_severity })
+    end
+end
+local function cursor_diagnostics()
+    vim.diagnostic.open_float({
+        scope = 'cursor',
+        border = 'single',
+    })
+end
+
+local keymaps = {
+    { 'n',          'gd',         '<cmd>Telescope lsp_definitions<cr>',       { desc = '[G]oto [D]efinition' } },
+    { 'n',          'gu',         '<cmd>Telescope lsp_references<cr>',        { desc = '[G]oto [U]sages' } },
+    { 'n',          'gi',         '<cmd>Telescope lsp_implementations<cr>',   { desc = '[G]oto [I]mplementations' } },
+    { 'n',          'gt',         '<cmd>Telescope lsp_type_definitions<cr>',  { desc = '[G]oto [T]ype Definitions' } },
+    { 'n',          '<leader>ds', '<cmd>Telescope lsp_document_symbols<cr>',  { desc = '[D]ocument [S]symbols' } },
+    { 'n',          '<leader>ps', '<cmd>Telescope lsp_workspace_symbols<cr>', { desc = '[P]roject [S]ymbols' } },
+    { { 'n', 'i' }, '<C-p>',      vim.lsp.buf.signature_help,                 { desc = 'Show [P]arameters' } },
+    { 'n',          'K',          '<cmd>Lspsaga hover_doc<cr>',               { desc = 'Documentation' } },
+    { 'n',          'R',          '<cmd>Lspsaga rename<cr>',                  { desc = '[R]ename' } },
+    { { 'n', 'i' }, '<M-Enter>',  '<cmd>Lspsaga code_action<cr>',             { desc = 'Code Actions' } },
+    { 'n',          '<leader>ca', '<cmd>Lspsaga code_action<cr><Esc>',        { desc = '[C]ode [A]ctions' } },
+    { 'n',          'ge',         next_diagnostic(severity.ERROR),            { desc = '[G]oto [E]rror' } },
+    { 'n',          'gE',         prev_diagnostic(severity.ERROR),            { desc = '[G]oto [E]rror (prev)' } },
+    { 'n',          'gw',         next_diagnostic(severity.ERROR),            { desc = '[G]oto [W]arning' } },
+    { 'n',          'gW',         prev_diagnostic(severity.ERROR),            { desc = '[G]oto [W]arning (prev)' } },
+    { 'n',          '<leader>D',  cursor_diagnostics,                         { desc = '[D]iagnostics under cursor' } },
+}
+
+local M = {}
+
+--- Registers LSP keymaps for the given buffer
+---@param bufnr number: the id of the buffer
+M.setup = function(bufnr)
+    for _, keymap in ipairs(keymaps) do
+        local mode = keymap[1]
+        local lhs = keymap[2]
+        local rhs = keymap[3]
+        local opts = keymap[4]
+
+        if not opts then
+            opts = {}
+        end
+
+        opts.buffer = bufnr
+        vim.keymap.set(mode, lhs, rhs, opts)
+    end
+end
+
+return M
diff --git a/.config/nvim/lua/custom/configs/lsp.lua b/.config/nvim/lua/custom/configs/lsp.lua
new file mode 100644
index 0000000..afae5af
--- /dev/null
+++ b/.config/nvim/lua/custom/configs/lsp.lua
@@ -0,0 +1,63 @@
+local capabilities = require('cmp_nvim_lsp').default_capabilities()
+local servers = require('custom.configs.language-servers')
+
+local lspconfig = require('lspconfig')
+for name, config in pairs(servers) do
+    if config == true then
+        ---@diagnostic disable-next-line: cast-local-type
+        config = {}
+    end
+    ---@diagnostic disable-next-line: cast-local-type
+    config = vim.tbl_deep_extend('force', {}, {
+        capabilities = capabilities,
+    }, config)
+
+    lspconfig[name].setup(config)
+end
+
+vim.api.nvim_create_autocmd('LspAttach', {
+    callback = function(args)
+        local bufnr = args.buf
+        local client = assert(vim.lsp.get_client_by_id(args.data.client_id), 'must have valid client')
+
+        local settings = servers[client.name]
+        if type(settings) ~= 'table' then
+            ---@diagnostic disable-next-line: cast-local-type
+            settings = {}
+        end
+
+        -- Override server capabilities
+        if settings.server_capabilities then
+            for k, v in pairs(settings.server_capabilities) do
+                if v == vim.NIL then
+                    v = nil
+                end
+                client.server_capabilities[k] = v
+            end
+        end
+
+        -- Register LSP keymaps local to buffer
+        require('custom.configs.lsp-keymaps').setup(bufnr)
+    end,
+})
+
+-- TODO: Decide if you want to use conform or not
+--
+-- -- Autoformatting Setup
+-- require('conform').setup({
+--     formatters_by_ft = {
+--         lua = { 'stylua' },
+--     },
+-- })
+--
+-- vim.api.nvim_create_autocmd('BufWritePre', {
+--     callback = function(args)
+--         require('conform').format({
+--             bufnr = args.buf,
+--             lsp_fallback = true,
+--             quiet = true,
+--         })
+--     end,
+-- })
+
+vim.diagnostic.config({ virtual_text = false })
diff --git a/.config/nvim/lua/custom/configs/mason.lua b/.config/nvim/lua/custom/configs/mason.lua
new file mode 100644
index 0000000..d7a537b
--- /dev/null
+++ b/.config/nvim/lua/custom/configs/mason.lua
@@ -0,0 +1,33 @@
+-- NOTE: Not language servers but still make sure mason installs them
+local ensure_installed = {
+    stylua = true, -- lua formatting
+}
+local servers = require('custom.configs.language-servers')
+
+require('mason').setup({
+    ui = {
+        icons = {
+            package_installed = '✓',
+            package_pending = '➜',
+            package_uninstalled = '✗',
+        },
+    },
+})
+
+local servers_to_install = vim.tbl_filter(function(key)
+    local server = servers[key]
+    if type(server) == 'table' then
+        return true
+    else
+        return server
+    end
+end, vim.tbl_keys(servers))
+
+vim.list_extend(ensure_installed, servers_to_install)
+require('mason-lspconfig').setup({ ensure_installed = servers_to_install })
+
+require('mason-tool-installer').setup({
+    ensure_installed = {
+        'stylua', -- lua formatter
+    },
+})