Wrote quick neovim list ranker

fst/him/nvim-nrw/lua/handdara/config/commands.lua

@@ -1,8 +1,12 @@
+
 return function()
-  vim.api.nvim_create_user_command('W', 'write', {})
-  vim.api.nvim_create_user_command('Wq', 'wq', {})
-  vim.api.nvim_create_user_command('Q', 'quit', {})
-  vim.api.nvim_create_user_command('Qa', 'qall', {})
-  vim.api.nvim_create_user_command('Wqa', 'wqall', {})
-  vim.api.nvim_create_user_command('FO', 'Fo', {})
+    vim.api.nvim_create_user_command('W', 'write', {})
+    vim.api.nvim_create_user_command('Wq', 'wq', {})
+    vim.api.nvim_create_user_command('Q', 'quit', {})
+    vim.api.nvim_create_user_command('Qa', 'qall', {})
+    vim.api.nvim_create_user_command('Wqa', 'wqall', {})
+    vim.api.nvim_create_user_command('FO', 'Fo', {})
+    vim.api.nvim_create_user_command('Ranker', function (opts)
+        require('handdara.util.ranker').ranker(opts.line1, opts.line2)
+    end , { range = true })
 end

fst/him/nvim-nrw/lua/handdara/util/init.lua

@@ -1,5 +1,7 @@
+local M = {}
+
 -- datetime number to string
-local function dtnum2str(x)
+function M.dtnum2str(x)
     local xs = tostring(x)
     if x < 10 then
         return '0' .. xs
@@ -8,7 +10,7 @@ local function dtnum2str(x)
     end
 end
 
-local function timestamp()
+function M.timestamp()
     local ts = os.date('*t')
     local months = { 'jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec' }
     local weekdays = { 'Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat' }
@@ -19,12 +21,9 @@ local function timestamp()
         mo_num = ts.month,
         wd = weekdays[ts.wday],
         wd_num = ts.wday,
-        hr = dtnum2str(ts.hour),
-        mi = dtnum2str(ts.min),
+        hr = M.dtnum2str(ts.hour),
+        mi = M.dtnum2str(ts.min),
     }
 end
 
-return {
-    timestamp = timestamp,
-    dtnum2str = dtnum2str,
-}
+return M

fst/him/nvim-nrw/lua/handdara/util/ranker.lua

@@ -0,0 +1,72 @@
+local M = {}
+
+local function user_cmp_sync(prompt, x, y)
+    -- Create a placeholder for the input result
+    local result = nil
+
+    -- Create a coroutine
+    local co = coroutine.running()
+    if not co then
+        error("This function must be called from within a coroutine")
+    end
+    vim.ui.select({ x, y }, {
+        prompt = prompt,
+        format_item = function(item)
+            return '- ' .. item
+        end,
+    }, function(choice)
+        result = choice
+        coroutine.resume(co)
+    end)
+    -- Yield control until the coroutine is resumed
+    coroutine.yield()
+    return result
+end
+
+local function sort(xs, cmp)
+    if #xs <= 1 then
+        return
+    else
+        local left, right = {}, {}
+        local pivot = xs[1]
+        for i = 2, #xs do
+            -- cmp  ~  <
+            if cmp(pivot, xs[i]) then
+                table.insert(right, xs[i])
+            else
+                table.insert(left, xs[i])
+            end
+        end
+        sort(left, cmp)
+        sort(right, cmp)
+        for j, v in ipairs(left) do
+            xs[j] = v
+        end
+        xs[#left + 1] = pivot
+        for j, v in ipairs(right) do
+            xs[j + 1 + #left] = v
+        end
+    end
+end
+
+-- Example usage
+local function rank(items, line1, line2)
+    local cmp = function(x, y)
+        local result = user_cmp_sync("Pick better:", x, y)
+        if result then
+            return x == result
+        else
+            vim.notify("cancelled ranker")
+            error("cancelled sort")
+        end
+    end
+    sort(items, cmp)
+    vim.api.nvim_buf_set_lines(0, line1 - 1, line2, false, items)
+end
+
+function M.ranker(line1, line2)
+    local items = vim.api.nvim_buf_get_lines(0, line1 - 1, line2, false)
+    coroutine.wrap(rank)(items, line1, line2)
+end
+
+return M