nvim: ui: install nvim-ufo and statuscol.nvim for better folds and status column.

nvim/lua/user/plugins/ui.lua

@@ -19,6 +19,50 @@ return {
             }
         }
     },
+    {
+        'kevinhwang91/nvim-ufo',
+        dependencies = {
+            'kevinhwang91/promise-async',
+        },
+        opts = {
+            fold_virt_text_handler = require("user.utils.ufo").foldtext
+        }
+    },
+    {
+        "luukvbaal/statuscol.nvim",
+        opts = function()
+            local builtin = require("statuscol.builtin")
+            return {
+                -- Align current relative number to the right.
+                relculright = true,
+                segments = {
+                    {
+                        click = "v:lua.ScSa",
+                        sign = {
+                            namespace = { "gitsigns" },
+                            maxwidth = 1,
+                            colwidth = 1,
+                        }
+                    },
+                    {
+                        click = "v:lua.ScSa",
+                        sign = {
+                            namespace = { "diagnostic/signs" },
+                            maxwidth = 1,
+                            colwidth = 3,
+                            -- auto = true,
+                        }
+                    },
+                    {
+                        text = { builtin.lnumfunc, " " },
+                        click = "v:lua.ScLa",
+                    },
+                    { text = { builtin.foldfunc, " " }, click = "v:lua.ScFa" },
+                    { text = { "│ " } },
+                }
+            }
+        end,
+    },
     -- File explorer
     {
         "nvim-neo-tree/neo-tree.nvim",

nvim/lua/user/utils/ufo.lua

@@ -0,0 +1,31 @@
+local M={}
+
+M.foldtext = 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
+
+return M