neovim-configuration/lua/lsp.lua

require('mason').setup({
  ui = {
    icons = {
      package_installed = "✓",
      package_pending = "➜",
      package_uninstalled = "✗"
    }
  }
})

require('mason-lspconfig').setup({
  -- A list of servers to automatically install if they're not already installed
  ensure_installed = {
    'lua_ls',
    -- 'rust_analyzer', -- handled by rust mrcjkb/rustaceanvim
    'yamlls',
    'ts_ls',
    'gopls',
    'clangd',
  },
})

-- lsp format selected range
function LSPRangeFormatFunction()
  vim.lsp.buf.format({
    async = true,
    range = {
      ["start"] = vim.api.nvim_buf_get_mark(0, "<"),
      ["end"] = vim.api.nvim_buf_get_mark(0, ">"),
    }
  })
end

-- Use an on_attach function to only map the following keys
-- after the language server attaches to the current buffer
local on_attach = function(client, bufnr)
  -- Enable completion triggered by <c-x><c-o>
  -- vim.api.nvim_buf_set_option(bufnr, 'omnifunc', 'v:lua.vim.lsp.omnifunc')

  -- See `:help vim.lsp.*` for documentation on any of the below functions
  local bufopts = { noremap = true, silent = true, buffer = bufnr }
  vim.keymap.set('n', 'K', vim.lsp.buf.hover, { desc = "LSP show signature", unpack(bufopts) })
  vim.keymap.set('n', '<space>wa', vim.lsp.buf.add_workspace_folder,
    { desc = "Workspace add folder", unpack(bufopts) })
  vim.keymap.set('n', '<space>wr', vim.lsp.buf.remove_workspace_folder,
    { desc = "Workspace remove folder", unpack(bufopts) })
  vim.keymap.set('n', '<space>wl', function()
    print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
  end, { desc = "Workspace list folders", unpack(bufopts) })
  vim.keymap.set('n', '<space>rn', vim.lsp.buf.rename, { desc = "LSP Rename", unpack(bufopts) })
  vim.keymap.set("n", "<space>f", function()
    vim.lsp.buf.format({ async = true })
  end, { desc = "LSP Format buffer", unpack(bufopts) })
  vim.keymap.set("v", "<space>f", LSPRangeFormatFunction, { desc = "LSP Format region" })

  -- 2024-09-09 - some ccflow commands for diagnostics, symbols and code actions
  local fzf = require('fzf-lua')
  vim.keymap.set('n', '<space>d', fzf.diagnostics_document, { desc = "Document diagnostics" })
  vim.keymap.set('n', '<space>D', fzf.diagnostics_workspace, { desc = "Workspace diagnostics" })
  vim.keymap.set('n', '<space>e', vim.diagnostic.open_float, { desc = "Popup diagnostics" })
  vim.keymap.set('n', '<space>s', fzf.lsp_document_symbols, { desc = "Doc symbols" })
  vim.keymap.set('n', '<space>c', fzf.lsp_code_actions, { desc = "Code Actions" })
  vim.keymap.set('n', '<space>[', vim.diagnostic.goto_prev, { desc = "Previous diagnostics" })
  vim.keymap.set('n', '<space>]', vim.diagnostic.goto_next, { desc = "Previous diagnostics" })

  local gitsigns = require('gitsigns')
  vim.keymap.set('n', '<space>==', gitsigns.preview_hunk_inline, { desc = "Git hunk preview" })
  vim.keymap.set('n', '<space>=B', gitsigns.blame, { desc = "Git blame file" })
  vim.keymap.set('n', '<space>=D', function() gitsigns.diffthis('~') end, { desc = "Git diff this (~)" })
  vim.keymap.set('n', '<space>=R', gitsigns.reset_buffer, { desc = "Git reset file" })
  vim.keymap.set('n', '<space>=S', gitsigns.stage_buffer, { desc = "Git stage file" })
  vim.keymap.set('n', '<space>=[', gitsigns.prev_hunk, { desc = "Git previous hunk" })
  vim.keymap.set('n', '<space>=]', gitsigns.next_hunk, { desc = "Git next hunk" })
  vim.keymap.set('n', '<space>=b', gitsigns.blame_line, { desc = "Git blame line" })
  vim.keymap.set('n', '<space>=d', gitsigns.diffthis, { desc = "Git diff this" })
  vim.keymap.set('n', '<space>=r', gitsigns.reset_hunk, { desc = "Git reset hunk" })
  vim.keymap.set('n', '<space>=s', gitsigns.stage_hunk, { desc = "Git stage hunk" })

  -- vim.keymap.set('n', 'gr', vim.lsp.buf.references, bufopts)
  vim.keymap.set('n', '<C-,>', fzf.lsp_references, { desc = "Find References" })
  vim.keymap.set('n', '<C-.>', fzf.lsp_definitions, { desc = "Find References" })
end

-- Set different settings for different languages' LSP
-- LSP list: https://github.com/neovim/nvim-lspconfig/blob/master/doc/configs.md
-- How to use setup({}): https://github.com/neovim/nvim-lspconfig/wiki/Understanding-setup-%7B%7D
--     - the settings table is sent to the LSP
--     - on_attach: a lua callback function to run after LSP attaches to a given buffer
local lspconfig = require('lspconfig')

-- from :h mason-lspconfig-automatic-server-setup
require('mason-lspconfig').setup_handlers({
  -- The first entry (without a key) will be the default handler
  -- and will be called for each installed server that doesn't have
  -- a dedicated handler.
  function(server_name) -- default handler (optional)

    -- 2024-10-29 Solargraph shall handle ruby AND sonicpi files, add on_init according to documentation
    if server_name == "solargraph" then
      lspconfig[server_name].setup {
        on_attach = on_attach,
        config = {
          on_init = function(client)
            require('sonicpi').lsp_on_init(client, {})
          end
        },
        filetypes = { 'ruby', 'sonicpi' },
      }
    end

    if server_name == 'ts_ls' then
      -- taken from https://github.com/vuejs/language-tools
      -- If you are using mason.nvim, you can get the ts_plugin_path like this
      local mason_registry = require('mason-registry')
      local vue_language_server_path = mason_registry.get_package('vue-language-server'):get_install_path() ..
          '/node_modules/@vue/language-server'

      lspconfig[server_name].setup {
        on_attach = on_attach,
        init_options = {
          plugins = {
            {
              name = '@vue/typescript-plugin',
              location = vue_language_server_path,
              languages = { 'vue' },
            },
          },
        },
        filetypes = { 'typescript', 'javascript', 'javascriptreact', 'typescriptreact', 'vue' },
      }
    else
      lspconfig[server_name].setup {
        on_attach = on_attach
      }
    end
  end
})


-- use on_attach to get lsp related shortcuts
vim.g.rustaceanvim = {
  -- LSP configuration
  server = {
    on_attach = on_attach
  }
}