Nvim: restructure all plugins configuration

.config/nvim/after/available/illuminate.rc.lua

@@ -0,0 +1,42 @@
+--require('illuminate').configure({
+--  large_file_cutoff = 3000
+--})
+
+HIGHLIGHT = 'highlight'
+vim.api.nvim_create_augroup(HIGHLIGHT, { clear = true })
+
+require('murmur').setup {
+  cursor_rgb = 'darkgreen', -- default to '#393939'
+  max_len = 80, -- maximum word-length to highlight
+  -- disable_on_lines = 2000, -- to prevent lagging on large files. Default to 2000 lines.
+  exclude_filetypes = {'log'},
+  callbacks = {
+    -- to trigger the close_events of vim.diagnostic.open_float.
+    function ()
+      -- Close floating diag. and make it triggerable again.
+      vim.cmd('doautocmd InsertEnter')
+      vim.w.diag_shown = false
+    end,
+  }
+}
+vim.api.nvim_create_autocmd('CursorHold', {
+  group = HIGHLIGHT,
+  pattern = '*',
+  callback = function ()
+    -- skip when a float-win already exists.
+    if vim.w.diag_shown then return end
+
+    -- open float-win when hovering on a cursor-word.
+    if vim.w.cursor_word ~= '' then
+      vim.diagnostic.open_float(nil, {
+        focusable = true,
+        close_events = { 'InsertEnter' },
+        border = 'rounded',
+        source = 'always',
+        prefix = ' ',
+        scope = 'cursor',
+      })
+      vim.w.diag_shown = true
+    end
+  end
+})