feat(picker): pin picker as a split to left/bottom/top/right with ctrl+z+(hjkl)

lua/snacks/picker/actions.lua

@@ -5,6 +5,9 @@ local M = {}
 ---@class snacks.picker.jump.Action: snacks.picker.Action
 ---@field cmd? snacks.picker.EditCmd
 
+---@class snacks.picker.layout.Action: snacks.picker.Action
+---@field layout? snacks.picker.layout.Config|string
+
 ---@enum (key) snacks.picker.EditCmd
 local edit_cmd = {
   edit = "buffer",
@@ -155,6 +158,27 @@ M.edit_split = M.split
 M.edit_vsplit = M.vsplit
 M.edit_tab = M.tab
 
+function M.layout(picker, _, action)
+  ---@cast action snacks.picker.layout.Action
+  assert(action.layout, "Layout action requires a layout")
+  local opts = type(action.layout) == "table" and { layout = action.layout } or action.layout
+  ---@cast opts snacks.picker.Config
+  local layout = Snacks.picker.config.layout(opts)
+  picker:set_layout(layout)
+  -- Adjust some options for split layouts
+  if (layout.layout.position or "float") ~= "float" then
+    picker.opts.auto_close = false
+    picker.opts.jump.close = false
+    picker:toggle_preview(false)
+    picker.list.win:focus()
+  end
+end
+
+M.layout_top = { action = "layout", layout = "top" }
+M.layout_bottom = { action = "layout", layout = "bottom" }
+M.layout_left = { action = "layout", layout = "left" }
+M.layout_right = { action = "layout", layout = "right" }
+
 function M.toggle_maximize(picker)
   picker.layout:maximize()
 end

lua/snacks/picker/config/defaults.lua

@@ -219,6 +219,14 @@ local defaults = {
         ["<c-s>"] = { "edit_split", mode = { "i", "n" } },
         ["<c-u>"] = { "list_scroll_up", mode = { "i", "n" } },
         ["<c-v>"] = { "edit_vsplit", mode = { "i", "n" } },
+        ["<c-z>h"] = { "layout_left", mode = { "i", "n" } },
+        ["<c-z><c-h>"] = { "layout_left", mode = { "i", "n" } },
+        ["<c-z>j"] = { "layout_bottom", mode = { "i", "n" } },
+        ["<c-z><c-j>"] = { "layout_bottom", mode = { "i", "n" } },
+        ["<c-z>k"] = { "layout_top", mode = { "i", "n" } },
+        ["<c-z><c-k>"] = { "layout_top", mode = { "i", "n" } },
+        ["<c-z>l"] = { "layout_right", mode = { "i", "n" } },
+        ["<c-z><c-l>"] = { "layout_right", mode = { "i", "n" } },
         ["?"] = "toggle_help_input",
         ["G"] = "list_bottom",
         ["gg"] = "list_top",
@@ -260,6 +268,14 @@ local defaults = {
         ["<c-s>"] = "edit_split",
         ["<c-u>"] = "list_scroll_up",
         ["<c-v>"] = "edit_vsplit",
+        ["<c-z>h"] = { "layout_left", mode = { "i", "n" } },
+        ["<c-z><c-h>"] = { "layout_left", mode = { "i", "n" } },
+        ["<c-z>j"] = { "layout_bottom", mode = { "i", "n" } },
+        ["<c-z><c-j>"] = { "layout_bottom", mode = { "i", "n" } },
+        ["<c-z>k"] = { "layout_top", mode = { "i", "n" } },
+        ["<c-z><c-k>"] = { "layout_top", mode = { "i", "n" } },
+        ["<c-z>l"] = { "layout_right", mode = { "i", "n" } },
+        ["<c-z><c-l>"] = { "layout_right", mode = { "i", "n" } },
         ["?"] = "toggle_help_list",
         ["G"] = "list_bottom",
         ["gg"] = "list_top",

lua/snacks/picker/config/init.lua

@@ -209,12 +209,20 @@ function M.layout(opts)
   end
 
   -- Resolve the preset
-  local preset = M.resolve(layout.preset or "custom", opts.source)
-  ---@type snacks.picker.layout.Config
-  local ret = vim.deepcopy(opts.layouts and opts.layouts[preset] or {})
+  local layouts = opts.layouts or M.get().layouts or {}
+  local done = {} ---@type table<string, boolean>
+  local todo = { layout } ---@type snacks.picker.layout.Config[]
+  while true do
+    local preset = M.resolve(todo[1].preset or "custom", opts.source)
+    if not preset or done[preset] or not layouts[preset] then
+      break
+    end
+    done[preset] = true
+    table.insert(todo, 1, vim.deepcopy(layouts[preset]))
+  end
 
   -- Merge and return the layout
-  return Snacks.config.merge(ret, layout)
+  return Snacks.config.merge(unpack(todo))
 end
 
 ---@generic T

lua/snacks/picker/config/layouts.lua

@@ -175,4 +175,9 @@ M.vscode = {
   },
 }
 
+M.left = M.sidebar
+M.right = { preset = "sidebar", layout = { position = "right" } }
+M.top = { preset = "ivy", layout = { position = "top" } }
+M.bottom = { preset = "ivy", layout = { position = "bottom" } }
+
 return M