[init,main,package] split initialization in early and late stage

This is a big move. Due to the restructuring of the initialization we
can now separate the early tasks -- mostly dirty stuff like writing
globals -- from the later stage where we actually inject the actual font
loader. As a consequence, the basic configuration is now present before
the font loader is injected. It’s not complete, though, in that the
reconfiguration step must still be executed after the font loader is
there, since some config variables require values to be set up by the
loader. A decision is pending regarding how we address the situation;
possible approaches are, in order of increasing complexity:

    * reconfigure twice, skip some of the steps the first time through
    * split reconfiguration into two stages
    * make configuration independent of fontloader values

Design-wise, the last point would be the most desirable, naturally.
Though the fontloader has been known to require extensive static
preparation which might very well make that strategy impossible or
unjustifiably demanding. We’ll see how it plays out …

3 files changed, 22 insertions, 6 deletions

diff --git a/src/fontloader/luaotfload-package.lua b/src/fontloader/luaotfload-package.lua
index b60ae17..725c498 100644
--- a/src/fontloader/luaotfload-package.lua
+++ b/src/fontloader/luaotfload-package.lua
@@ -63,12 +63,16 @@ loadmodule "l-boolean.lua"
 loadmodule "l-math.lua"
 loadmodule "util-str.lua"
 
+--- Another file containing auxiliary definitions must be present
+--- prior to initialization of the configuration.
+
+loadmodule "luatex-basics-gen.lua"
+
 --- The files below constitute the “fontloader proper”. Some of the
 --- functionality like file resolvers is overloaded later by
 --- Luaotfload. Consequently, the resulting package is pretty
 --- bare-bones and not usable independently.
 
-loadmodule("luatex-basics-gen.lua")
 loadmodule("data-con.lua")
 loadmodule("luatex-basics-nod.lua")
 loadmodule("font-ini.lua")
diff --git a/src/luaotfload-init.lua b/src/luaotfload-init.lua
index ac27b2c..0ef968d 100644
--- a/src/luaotfload-init.lua
+++ b/src/luaotfload-init.lua
@@ -65,7 +65,7 @@ local logreport  --- filled in after loading the log module
 --doc]]--
 
 
-local init_pre = function ()
+local init_early = function ()
 
   local store                  = { }
   config                       = config or { } --- global
@@ -74,6 +74,7 @@ local init_pre = function ()
   config.lualibs.verbose       = false
   config.lualibs.prefer_merged = true
   config.lualibs.load_extended = true
+  fonts                        = fonts or { }
 
   require "lualibs"
 
@@ -131,8 +132,10 @@ local init_pre = function ()
     return number
   end
 
+  luaotfload.loaders.fontloader "basics-gen"
+
   return store
-end --- [init_pre]
+end --- [init_early]
 
 --[[doc--
 
@@ -345,6 +348,13 @@ local init_post_load_agl = function ()
     return
   end
 
+  if next (fonts.encodings.agl) then
+      --- unnecessary because the file shouldn’t be loaded at this time
+      --- but we’re just making sure
+      fonts.encodings.agl = nil
+      collectgarbage"collect"
+  end
+
   local agl_init = { }      --- start out empty, fill on demand
   encodings.agl  = agl_init --- ugh, replaced again later
 
@@ -408,9 +418,9 @@ local init_post = function ()
 end --- [init_post]
 
 return {
-  init = function ()
+  early = init_early,
+  main = function (store)
     local starttime = os.gettimeofday ()
-    local store = init_pre ()
     store.our_environment, store.context_environment = init_adapt ()
     init_main ()
     init_cleanup (store)
diff --git a/src/luaotfload-main.lua b/src/luaotfload-main.lua
index 2a49686..5ac1421 100644
--- a/src/luaotfload-main.lua
+++ b/src/luaotfload-main.lua
@@ -153,8 +153,8 @@ luaotfload.loaders.luaotfload = load_luaotfload_module
 luaotfload.loaders.fontloader = load_fontloader_module
 
 luaotfload.init = load_luaotfload_module "init" --- fontloader initialization
-luaotfload.init.init ()
 
+local store           = luaotfload.init.early ()
 local log             = luaotfload.log
 local logreport       = log.report
 
@@ -171,6 +171,8 @@ if not config.actions.apply_defaults () then
     logreport ("log", 0, "load", "Configuration unsuccessful.")
 end
 
+luaotfload.init.main (store)
+
 load_luaotfload_module "loaders"         --- Type1 font wrappers
 load_luaotfload_module "database"        --- Font management.
 load_luaotfload_module "colors"          --- Per-font colors.