local nvim_lsp = require('lspconfig')
local on_attach = function(client, bufnr)
    local function buf_set_keymap(...) vim.api.nvim_buf_set_keymap(bufnr, ...) end
    local function buf_set_option(...) vim.api.nvim_buf_set_option(bufnr, ...) end

    buf_set_option('omnifunc', 'v:lua.vim.lsp.omnifunc')

    -- Mappings.
    local bufopts = { noremap=true, silent=true, buffer=bufnr }
    vim.keymap.set('n', 'gD', vim.lsp.buf.declaration, bufopts)
    vim.keymap.set('n', 'gd', vim.lsp.buf.definition, bufopts)
    vim.keymap.set('n', 'K', vim.lsp.buf.hover, bufopts)
    vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, bufopts)
    vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, bufopts)

    local opts = { noremap=true, silent=true }
    vim.keymap.set('n', '<space>d', vim.diagnostic.open_float, 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', '<space>q', vim.diagnostic.setloclist, opts)
    vim.keymap.set('n', '<space>D', vim.lsp.buf.type_definition, bufopts)
end

local servers = { "hls", "rnix", "bashls" }
for _, lsp in ipairs(servers) do
    nvim_lsp[lsp].setup {
        on_attach = on_attach,
    }
end

local capabilities = require('cmp_nvim_lsp')
    .update_capabilities(vim.lsp.protocol.make_client_capabilities())

capabilities.textDocument.completion.completionItem.snippetSupport = true

nvim_lsp.rust_analyzer.setup {
    on_attach = on_attach,
    settings = {
        ["rust-analyzer"] = {
            procMacro = {
                enable = true
            },
            cargo = {
                allFeatures = true,
            },
        },
    },
}

nvim_lsp.ccls.setup {
    capabilities = capabilities, 
    on_attach = on_attach,
    init_options = {
        index = {
            threads = 0;
        };
        clang = {
            extraArgs = { "-fopenmp" };
            excludeArgs = { "-frounding-math" } ;
        };
    }
}