feat(nvim): nvim-ufo, indent-blankline, gitsigns

config/nvim/lua/plugins/ui.lua

@@ -38,6 +38,77 @@ return {
       background_colour = "#000000",
     },
   },
+  -- Not UFO in the sky, but an ultra fold in Neovim.
+  -- https://github.com/kevinhwang91/nvim-ufo/
+  {
+    "kevinhwang91/nvim-ufo",
+    lazy = false,
+    enabled = true,
+    dependencies = {
+      "kevinhwang91/promise-async",
+      { "nvim-treesitter/nvim-treesitter", run = ":TSUpdate" },
+    },
+    init = function()
+      vim.o.fillchars = [[eob: ,fold: ,foldopen:,foldsep: ,foldclose:]]
+      vim.o.foldcolumn = "1" -- '0' is not bad
+      vim.o.foldlevel = 99 -- Using ufo provider need a large value, feel free to decrease the value
+      vim.o.foldlevelstart = 99
+      vim.o.foldenable = true
+    end,
+    opts = {
+      open_fold_hl_timeout = 150,
+      close_fold_kinds = { "imports", "comment" },
+      preview = {
+        win_config = {
+          border = { "", "─", "", "", "", "─", "", "" },
+          winhighlight = "Normal:Folded",
+          winblend = 0,
+        },
+        mappings = {
+          scrollU = "<C-u>",
+          scrollD = "<C-d>",
+          jumpTop = "[",
+          jumpBot = "]",
+        },
+      },
+      provider_selector = function(bufnr, filetype, buftype)
+        return { "treesitter", "indent" }
+      end,
+      fold_virt_text_handler = function(virtText, lnum, endLnum, width, truncate)
+        local newVirtText = {}
+        local suffix = (" 󰁂 %d "):format(endLnum - lnum)
+        local sufWidth = vim.fn.strdisplaywidth(suffix)
+        local targetWidth = width - sufWidth
+        local curWidth = 0
+        for _, chunk in ipairs(virtText) do
+          local chunkText = chunk[1]
+          local chunkWidth = vim.fn.strdisplaywidth(chunkText)
+          if targetWidth > curWidth + chunkWidth then
+            table.insert(newVirtText, chunk)
+          else
+            chunkText = truncate(chunkText, targetWidth - curWidth)
+            local hlGroup = chunk[2]
+            table.insert(newVirtText, { chunkText, hlGroup })
+            chunkWidth = vim.fn.strdisplaywidth(chunkText)
+            -- str width returned from truncate() may less than 2nd argument, need padding
+            if curWidth + chunkWidth < targetWidth then
+              suffix = suffix .. (" "):rep(targetWidth - curWidth - chunkWidth)
+            end
+            break
+          end
+          curWidth = curWidth + chunkWidth
+        end
+        table.insert(newVirtText, { suffix, "MoreMsg" })
+        return newVirtText
+      end,
+    },
+  },
+  -- Indent guides for Neovim
+  -- https://github.com/lukas-reineke/indent-blankline.nvim
+  { "lukas-reineke/indent-blankline.nvim" },
+  -- Git integration for buffers
+  -- https://github.com/lewis6991/gitsigns.nvim
+  { "lewis6991/gitsigns.nvim" },
   -- Getting you where you want with the fewest keystrokes.
   -- https://github.com/ThePrimeagen/harpoon
   { "ThePrimeagen/harpoon" },