feat(snacks): zen mode

lua/snacks/zen.lua

@@ -0,0 +1,91 @@
+---@class snacks.zen
+local M = {}
+
+---@class snacks.zen.Config
+local defaults = {}
+
+Snacks.config.style("zen", {
+  enter = true,
+  fixbuf = false,
+  minimal = false,
+  width = 120,
+  height = 0,
+  backdrop = { transparent = true, blend = 20 },
+  keys = { q = false },
+  wo = {
+    winhighlight = "NormalFloat:Normal",
+  },
+})
+
+Snacks.config.style("zoom", {
+  style = "zen",
+  backdrop = false,
+  width = 0,
+})
+
+---@param opts? snacks.win.Config
+function M.zen(opts)
+  -- close if already open
+  if vim.w[vim.api.nvim_get_current_win()].snacks_zen then
+    vim.cmd("close")
+    return
+  end
+
+  local parent_win = vim.api.nvim_get_current_win()
+  local buf = vim.api.nvim_get_current_buf()
+  local win = Snacks.win(Snacks.win.resolve({ style = "zen" }, opts, { buf = buf }))
+
+  vim.w[win.win].snacks_zen = true
+
+  -- update the buffer of the parent window
+  -- when the zen buffer changes
+  vim.api.nvim_create_autocmd("BufWinEnter", {
+    group = win.augroup,
+    callback = function()
+      vim.api.nvim_win_set_buf(parent_win, win.buf)
+    end,
+  })
+
+  -- close when entering another window
+  vim.api.nvim_create_autocmd("WinEnter", {
+    group = win.augroup,
+    callback = function()
+      local w = vim.api.nvim_get_current_win()
+      if w == win.win then
+        return
+      end
+      -- exit if other window is not a floating window
+      if vim.api.nvim_win_get_config(w).relative == "" then
+        win:close()
+      end
+    end,
+  })
+  return win
+end
+
+---@param opts? snacks.win.Config
+function M.zoom(opts)
+  opts = Snacks.win.resolve({
+    style = "zoom",
+    col = M.main().col,
+    height = function()
+      return M.main().height
+    end,
+  }, opts)
+  return M.zen(opts)
+end
+
+function M.main()
+  local bottom = vim.o.cmdheight + (vim.o.laststatus == 3 and 1 or 0)
+  local top = (vim.o.showtabline == 2 or (vim.o.showtabline == 1 and #vim.api.nvim_list_tabpages() > 1)) and 1 or 0
+  ---@class snacks.zen.Main values are 0-indexed
+  local ret = {
+    col = 0,
+    width = vim.o.columns,
+    row = top,
+    height = vim.o.lines - top - bottom,
+  }
+  return ret
+end
+
+return M