Keybindings and smaller ui related improvements

Options:

- lualine shows path of files
- added breadcrumbs to programming buffers as winbar

Plugins:

- added mrcjkb/rustaceanvim for improved rust support
- added lewis6991/gitsigns.nvim to show changes in files
- dropped lspkind, it had no visible effect and could not easily be
  fixed
- added j-hui/fidget.nvim to make $/progress messages (e.g. from lsp)
  visible

Keybindings:

- dropped unused and commented out keybindings
- <leader>fr to resume last fzf search
- <C-W>0, 1, 2, 3 to mimic emacs <C-x>.... window keys
- <esc><esc> to clear last search
- added desc field to many keybindings in lsp

lua/keybindings.lua

@@ -1,17 +1,18 @@
 -- Setup fzf-lua keybindings and some other searches
 local fzf = require('fzf-lua')
-vim.keymap.set('n', '<leader>ff', fzf.files, { desc = "Find file" })
+vim.keymap.set('n', '<leader>b', fzf.buffers, { desc = "Buffers" })
-vim.keymap.set('n', '<leader>fs', fzf.blines, { desc = "Search buffer" })
-vim.keymap.set('n', '<leader>fg', fzf.live_grep, { desc = "Grep" })
 vim.keymap.set('n', '<leader>fG', fzf.grep_cword, { desc = "Grep word under cursor" })
 vim.keymap.set('n', '<leader>fc', fzf.commands, { desc = "Commands" })
+vim.keymap.set('n', '<leader>ff', fzf.files, { desc = "Find file" })
+vim.keymap.set('n', '<leader>fg', fzf.live_grep, { desc = "Grep" })
 vim.keymap.set('n', '<leader>fm', fzf.manpages, { desc = "Manpages" })
-vim.keymap.set('n', '<leader>b', fzf.buffers, { desc = "Buffers" })
+vim.keymap.set('n', '<leader>fr', fzf.resume, { desc = "Resume last search" })
+vim.keymap.set('n', '<leader>fs', fzf.blines, { desc = "Search buffer" })
 
 vim.keymap.set('n', '<leader>ft', ":TodoFzfLua<CR>", { desc = "Todos" })
 
 -- use fzf buffer lines as default search
-vim.keymap.set('n', '/', fzf.blines, { desc = "Search buffer" })
+vim.keymap.set('n', '<C-/>', fzf.blines, { desc = "Search buffer" })
 vim.keymap.set('n', 'z=', fzf.spell_suggest, { desc = "Spelling suggestions" })
 
 -- open file manager and git
@@ -63,6 +64,9 @@ vim.keymap.set('n', '<space>mc', mywords.uhl_all, { desc = "Clear all highlights
 -- Shortcuts which are known from Emacs
 --
 ------------------------------------------
-vim.keymap.set('n', '<C-W>1', ":wincmd o<CR>", { desc = "Win: close others" })
+vim.keymap.set('n', '<C-W>0', ":hide<CR>", { desc = "Win: close current" })
-vim.keymap.set('n', '<C-W>0', ":only<CR>", { desc = "Win: close current" })
+vim.keymap.set('n', '<C-W>1', ":only<CR>", { desc = "Win: close others" })
+vim.keymap.set('n', '<C-W>2', ":split<CR>", { desc = "Win: split horizontally" })
+vim.keymap.set('n', '<C-W>2', ":vsplit<CR>", { desc = "Win: split vertically" })
 vim.keymap.set('n', '<space>q', "gwap", { desc = "Wrap paragraph" })
+vim.keymap.set('n', '<esc><esc>', ":silent! nohls<CR>", { desc = "Clear search" })

lua/lsp.lua

@@ -13,7 +13,7 @@ require('mason-lspconfig').setup({
   ensure_installed = {
     'pylsp',
     'lua_ls',
-    'rust_analyzer',
+    -- 'rust_analyzer', -- handled by rust mrcjkb/rustaceanvim
     'yamlls',
     'ts_ls',
     'gopls',
@@ -22,45 +22,33 @@ require('mason-lspconfig').setup({
   },
 })
 
--- Customized on_attach function
--- See `:help vim.diagnostic.*` for documentation on any of the below functions
-local opts = { noremap = true, silent = true }
-vim.keymap.set('n', '<space>e', vim.diagnostic.open_float, { noremap = true, silent = true, desc = "Popup diagnostics" })
--- 2024-09-23 - currently unused
--- vim.keymap.set('n', '<space>q', vim.diagnostic.setloclist, opts)
-vim.keymap.set('n', '[d', vim.diagnostic.goto_prev, opts)
-vim.keymap.set('n', ']d', vim.diagnostic.goto_next, opts)
 
 -- 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')
+  -- 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', 'gD', vim.lsp.buf.declaration, bufopts)
+  vim.keymap.set('n', 'K', vim.lsp.buf.hover, { desc = "LSP show signature", unpack(bufopts) })
-  vim.keymap.set('n', 'gd', vim.lsp.buf.definition, bufopts)
+  vim.keymap.set('n', '<space>wa', vim.lsp.buf.add_workspace_folder,
-  vim.keymap.set('n', 'K', vim.lsp.buf.hover, bufopts)
+    { desc = "Workspace add folder", unpack(bufopts) })
-  vim.keymap.set('n', 'gi', vim.lsp.buf.implementation, bufopts)
+  vim.keymap.set('n', '<space>wr', vim.lsp.buf.remove_workspace_folder,
-  vim.keymap.set('n', '<C-k>', vim.lsp.buf.signature_help, bufopts)
+    { desc = "Workspace remove folder", unpack(bufopts) })
-  vim.keymap.set('n', '<space>wa', vim.lsp.buf.add_workspace_folder, bufopts)
-  vim.keymap.set('n', '<space>wr', vim.lsp.buf.remove_workspace_folder, bufopts)
   vim.keymap.set('n', '<space>wl', function()
     print(vim.inspect(vim.lsp.buf.list_workspace_folders()))
-  end, bufopts)
+  end, { desc = "Workspace list folders", unpack(bufopts) })
-  -- vim.keymap.set('n', '<space>D', vim.lsp.buf.type_definition, bufopts)
+  vim.keymap.set('n', '<space>rn', vim.lsp.buf.rename, { desc = "LSP Rename", unpack(bufopts) })
-  vim.keymap.set('n', '<space>rn', vim.lsp.buf.rename, bufopts)
-  -- vim.keymap.set('n', '<space>ca', vim.lsp.buf.code_action, bufopts)
   vim.keymap.set("n", "<space>f", function()
     vim.lsp.buf.format({ async = true })
-  end, bufopts)
+  end, { desc = "LSP Format buffer", unpack(bufopts) })
 
   -- 2024-09-09 - some ccflow commands
-
   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', 'gr', vim.lsp.buf.references, bufopts)
@@ -69,7 +57,7 @@ local on_attach = function(client, bufnr)
 end
 
 -- Set different settings for different languages' LSP
--- LSP list: https://github.com/neovim/nvim-lspconfig/blob/master/doc/server_configurations.md
+-- 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
@@ -108,3 +96,12 @@ require('mason-lspconfig').setup_handlers({
     end
   end
 })
+
+
+-- use on_attach to get lsp related shortcuts
+vim.g.rustaceanvim = {
+  -- LSP configuration
+  server = {
+    on_attach = on_attach
+  }
+}

lua/plugins.lua

@@ -12,17 +12,10 @@ end
 vim.opt.rtp:prepend(lazypath)
 
 require("lazy").setup({
-  -- Vscode-like pictograms
-  {
-    "onsails/lspkind.nvim",
-    event = { "VimEnter" },
-  },
-
   -- Auto-completion engine
   {
     "hrsh7th/nvim-cmp",
     dependencies = {
-      "lspkind.nvim",
       "hrsh7th/cmp-nvim-lsp",     -- lsp auto-completion
       "hrsh7th/cmp-buffer",       -- buffer auto-completion
       "hrsh7th/cmp-path",         -- path auto-completion
@@ -49,6 +42,16 @@ require("lazy").setup({
   "williamboman/mason.nvim",
   "williamboman/mason-lspconfig.nvim",
   "neovim/nvim-lspconfig",
+
+  -- Nice plugin to show what LSPs are doing in the background (and others
+  -- using $/progress and vim.notify())
+  {
+    "j-hui/fidget.nvim",
+    opts = {
+      -- options
+    },
+  },
+
   -- show lsp signature while coding
   {
     "ray-x/lsp_signature.nvim",
@@ -94,6 +97,9 @@ require("lazy").setup({
     end,
   },
 
+  -- comfortable table editing, esp. used in orgmode
+  { 'dhruvasagar/vim-table-mode' },
+
   -- fzf-lua
   {
     "ibhagwan/fzf-lua",
@@ -107,7 +113,7 @@ require("lazy").setup({
     end
   },
 
-  -- whichkey
+  -- which-key
   {
     "folke/which-key.nvim",
     event = "VeryLazy",
@@ -161,6 +167,34 @@ require("lazy").setup({
     'nvim-lualine/lualine.nvim',
     dependencies = { 'nvim-tree/nvim-web-devicons' },
     config = function()
+      -- an alternative might be:
+      -- https://github.com/nvim-treesitter/nvim-treesitter-context
+      local function breadcrumb()
+        local result = require 'nvim-treesitter'.statusline(
+          {
+            type_patterns = {
+              "class",
+              "impl",
+              "function",
+              "method",
+              "import",
+              "for",
+              "if",
+              "while",
+              "variable",
+              "comment",
+            },
+            separator = " ▶ "
+          }
+        )
+        if result == "" then
+          result = ' '
+        elseif result == nil then
+          result = ''
+        end
+        return result
+      end
+
       require("lualine").setup {
         options = {
           icons_enabled = false,
@@ -181,7 +215,7 @@ require("lazy").setup({
           }
         },
         sections = {
-          lualine_a = { 'filename' },
+          lualine_a = { { 'filename', path = 1, shorting_target = 50 } },
           lualine_b = { 'branch', 'diff', 'diagnostics' },
           lualine_c = {},
           lualine_x = { 'encoding', 'fileformat', 'filetype' },
@@ -189,16 +223,25 @@ require("lazy").setup({
           lualine_z = { 'progress', 'location' }
         },
         inactive_sections = {
-          lualine_a = {},
+          lualine_a = { { 'filename', path = 1, shorting_target = 50 } },
           lualine_b = {},
-          lualine_c = { 'filename' },
+          lualine_c = {},
-          lualine_x = { 'location' },
+          -- lualine_x = { 'encoding', 'fileformat', 'filetype' },
-          lualine_y = {},
+          lualine_x = {},
-          lualine_z = {}
+          lualine_y = { 'filesize' },
+          lualine_z = { 'location' }
         },
         tabline = {},
-        winbar = {},
+        winbar = {
-        inactive_winbar = {},
+          lualine_a = {
+            { breadcrumb,
+              color = { bg = '#101010', fg = '#568200' },
+            },
+          },
+        },
+        inactive_winbar = {
+          lualine_a = { breadcrumb },
+        },
         extensions = {}
       }
     end
@@ -247,9 +290,6 @@ require("lazy").setup({
     "PhilRunninger/cmp-rpncalc",
   },
 
-  -- comfortable table editing, esp. used in orgmode
-  { 'dhruvasagar/vim-table-mode' },
-
   -- TODO, WARN, HACK, PERF, NOTE, TEST and others highlighting and searching
   {
     "folke/todo-comments.nvim",
@@ -275,8 +315,8 @@ require("lazy").setup({
   { "cpkio/nvim-treesitter-asciidoc" },
 
 
+  -- Greeter to run on NeoVim startup
   {
-
     'goolord/alpha-nvim',
     dependencies = {
       'nvim-tree/nvim-web-devicons',
@@ -384,5 +424,18 @@ require("lazy").setup({
     end,
   },
 
+  -- improved Rust support
+  {
+    'mrcjkb/rustaceanvim',
+    version = '^5', -- Recommended
+    lazy = false,   -- This plugin is already lazy
+  },
 
+  -- show git changes on the left
+  {
+    "lewis6991/gitsigns.nvim",
+    config = function()
+      require('gitsigns').setup()
+    end,
+  },
 })