Background selector (#4519)

* UPDATE: select background method

* ADD: migration file for background selector

* Add symlink for background selector in walker-elephant.sh

Forgot about this file. Should be added to make sure the background selector feature available in the fresh install

* clean up the code a bit

Updated omarchy background selector to hide from provider list and removed subtext from entries.

* Make the background selector the default

* Fix migration

* FIX: typo on background symlink target

* UPDATE: add ~/.config/omarchy/backgrounds/theme.name

* UPDATE: Cache = false

* Fix escaping for all extensions

* Extract omarchy-theme-bg-set

---------

Co-authored-by: David Heinemeier Hansson <david@hey.com>

default/elephant/omarchy_background_selector.lua

@@ -0,0 +1,56 @@
+Name = "omarchyBackgroundSelector"
+NamePretty = "Omarchy Background Selector"
+Cache = false
+HideFromProviderlist = true
+SearchName = true
+
+function GetEntries()
+  local entries = {}
+  local home = os.getenv("HOME")
+
+  -- Read current theme name
+  local theme_name_file = io.open(home .. "/.config/omarchy/current/theme.name", "r")
+  local theme_name = theme_name_file and theme_name_file:read("*l") or nil
+  if theme_name_file then
+    theme_name_file:close()
+  end
+
+  -- Directories to search
+  local dirs = {
+    home .. "/.config/omarchy/current/theme/backgrounds",
+  }
+  if theme_name then
+    table.insert(dirs, home .. "/.config/omarchy/backgrounds/" .. theme_name)
+  end
+
+  -- Track added files to avoid duplicates
+  local seen = {}
+
+  for _, wallpaper_dir in ipairs(dirs) do
+    local handle = io.popen(
+      "find '"
+        .. wallpaper_dir
+        .. "' -maxdepth 1 -type f \\( -name '*.jpg' -o -name '*.jpeg' -o -name '*.png' -o -name '*.gif' -o -name '*.bmp' -o -name '*.webp' \\) 2>/dev/null"
+    )
+    if handle then
+      for background in handle:lines() do
+        local filename = background:match("([^/]+)$")
+        if filename and not seen[filename] then
+          seen[filename] = true
+          table.insert(entries, {
+            Text = filename,
+            Value = background,
+            Actions = {
+              activate = "omarchy-theme-bg-set '" .. background .. "'",
+            },
+            Preview = background,
+            PreviewType = "file",
+          })
+        end
+      end
+      handle:close()
+    end
+  end
+
+  return entries
+end