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src/core/SaveData.lua

@@ -304,6 +304,10 @@ function SaveData.defaultOptions()
     -- options.lua written before this key keeps its exact meaning.  Read and
     -- written through SaveData.modEnabled / SaveData.setModEnabled.
     modsByVersion = {},
+    -- Set after the first per-game enablement migration.  Older options files
+    -- have only `mods`, so the migration copies each installed mod's current
+    -- answer to every game before game-specific toggles begin changing it.
+    modsByVersionMigrated = false,
     -- Named setups the player can switch between (#593; src/mods/ModProfile.lua
     -- owns the shape, src/mods/ManagerState.lua the UI): each row is
     -- { name, enabled = {id=bool}, options = {id={k=v}}, slots = {version=slotId} }.
@@ -563,19 +567,68 @@ end
 -- only holds the games the player actually chose for, so a mod set can differ
 -- between Red and Gold without either one owning the other's flags.
 
--- Whether a per-game answer is honoured at boot.  The loader reads the enable
--- flags once, before any entry chunk (src/mods/Loader.lua _loadState), so this
--- flips on with that read and not before: until then every writer keeps to the
--- shared flag and no surface promises what the boot does not do.
-SaveData.PER_VERSION_MODS = false
+-- Per-game answers are live.  Every reader and writer goes through modScope,
+-- so a choice made in the launcher is the choice the next boot loads.
+SaveData.PER_VERSION_MODS = true
 
--- The version a write should be scoped to: the game asked for once per-game
--- flags are live, nil (the shared flag) while they are only a preview.
+-- The version a write is scoped to: per-game controls name one game; a nil
+-- caller still addresses the legacy shared fallback.
 function SaveData.modScope(version)
   if SaveData.PER_VERSION_MODS then return version end
   return nil
 end
 
+-- Promote an installation that predates per-game flags.  `mods` may contain
+-- manifest rows ({ id, experimental }) or bare ids.  A mod with no old entry
+-- had the loader default: on, except for experimental mods.  Copy that answer
+-- to every game once, preserving any per-game overlay somebody imported before
+-- this feature shipped.  New installs need no rows here: an absent answer
+-- still defaults to enabled for every game.
+function SaveData.migrateModEnablement(options, mods)
+  if type(options) ~= "table" or options.modsByVersionMigrated then return false end
+  options.mods = type(options.mods) == "table" and options.mods or {}
+  options.modsByVersion = type(options.modsByVersion) == "table"
+    and options.modsByVersion or {}
+
+  local known = {}
+  for id in pairs(options.mods) do
+    if type(id) == "string" and id ~= "" then known[id] = { id = id } end
+  end
+  for version, bucket in pairs(options.modsByVersion) do
+    if GameVersion.VERSIONS[version] and type(bucket) == "table" then
+      for id in pairs(bucket) do
+        if type(id) == "string" and id ~= "" then known[id] = known[id] or { id = id } end
+      end
+    end
+  end
+  for _, mod in ipairs(mods or {}) do
+    local id = type(mod) == "table" and mod.id or mod
+    if type(id) == "string" and id ~= "" then
+      known[id] = type(mod) == "table" and mod or (known[id] or { id = id })
+    end
+  end
+
+  -- Do not create options.lua just to record an empty migration on a fresh
+  -- no-mod boot.  Keep it pending until there is a real installed or saved
+  -- mod answer to preserve.
+  if next(known) == nil then return false end
+
+  for id, mod in pairs(known) do
+    local shared = options.mods[id]
+    if type(shared) ~= "boolean" then shared = not (mod.experimental == true) end
+    for _, version in ipairs(GameVersion.ORDER) do
+      local bucket = options.modsByVersion[version]
+      if type(bucket) ~= "table" then
+        bucket = {}
+        options.modsByVersion[version] = bucket
+      end
+      if type(bucket[id]) ~= "boolean" then bucket[id] = shared end
+    end
+  end
+  options.modsByVersionMigrated = true
+  return true
+end
+
 -- true/false as chosen for `version`, else the shared flag, else nil -- the
 -- caller owns the default (the loader enables, the launcher keeps
 -- experimental mods off until asked).