diff -urNp a/extensions/goat-exercises/goat-exercise-lua.lua b/extensions/goat-exercises/goat-exercise-lua.lua

--- a/extensions/goat-exercises/goat-exercise-lua.lua	2022-03-09 09:39:44.007314944 +0100

+++ b/extensions/goat-exercises/goat-exercise-lua.lua	1970-01-01 01:00:00.000000000 +0100

@@ -1,184 +0,0 @@

-#!/usr/bin/env luajit

-

--- GIMP - The GNU Image Manipulation Program

--- Copyright (C) 1995 Spencer Kimball and Peter Mattis

---

--- goat-exercise-lua.lua

--- Copyright (C) Jehan

---

--- This program is free software: you can redistribute it and/or modify

--- it under the terms of the GNU General Public License as published by

--- the Free Software Foundation; either version 3 of the License, or

--- (at your option) any later version.

---

--- This program is distributed in the hope that it will be useful,

--- but WITHOUT ANY WARRANTY; without even the implied warranty of

--- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

--- GNU General Public License for more details.

---

--- You should have received a copy of the GNU General Public License

--- along with this program.  If not, see <https://www.gnu.org/licenses/>.

-

-local lgi = require 'lgi'

-

-local GLib    = lgi.GLib

-local GObject = lgi.GObject

-local Gio     = lgi.Gio

-local Gegl    = lgi.Gegl

-local Gimp    = lgi.Gimp

-local GimpUi  = lgi.GimpUi

-local Gtk     = lgi.Gtk

-local Gdk     = lgi.Gdk

-

-local Goat = lgi.package 'Goat'

-local Goat = lgi.Goat

-

-function run(procedure, run_mode, image, drawables, args, run_data)

-  -- procedure:new_return_values() crashes LGI so we construct the

-  -- GimpValueArray manually.

-  local retval = Gimp.ValueArray(1)

-

-  if table.getn(drawables) ~= 1 then

-    local calling_err = GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.CALLING_ERROR)

-    local msg         = "Procedure '%s' only works with one drawable."

-

-    msg = string.format(msg, procedure:get_name())

-

-    retval:append(calling_err)

-    retval:append(GObject.Value(GObject.Type.STRING, msg))

-    return retval

-  end

-

-  local drawable = drawables[1]

-

-  -- Not sure why run_mode has become a string instead of testing

-  -- against Gimp.RunMode.INTERACTIVE.

-  if run_mode == "INTERACTIVE" then

-    GimpUi.init("goat-exercise-lua");

-    local dialog = GimpUi.Dialog {

-      title          = "Exercise a goat (Lua)",

-      role           = "goat-exercise-Lua",

-      use_header_bar = 1

-    }

-    dialog:add_button("_Cancel", Gtk.ResponseType.CANCEL);

-    dialog:add_button("_Source", Gtk.ResponseType.APPLY);

-    dialog:add_button("_OK", Gtk.ResponseType.OK);

-

-    local geometry = Gdk.Geometry()

-    geometry.min_aspect = 0.5;

-    geometry.max_aspect = 1.0;

-    dialog:set_geometry_hints (nil, geometry, Gdk.WindowHints.ASPECT);

-

-    local box = Gtk.Box {

-      orientation = Gtk.Orientation.VERTICAL,

-      spacing     = 2

-    }

-    dialog:get_content_area():add(box)

-    box:show()

-

-    local lang = "Lua"

-    local head_text = "This plug-in is an exercise in '%s' to demo plug-in creation.\n" ..

-                      "Check out the last version of the source code online by clicking the \"Source\" button."

-

-    local label = Gtk.Label { label = string.format(head_text, lang) }

-    box:pack_start(label, false, false, 1)

-    label:show()

-

-    local contents = GLib.file_get_contents(arg[0])

-    if (contents) then

-      local scrolled = Gtk.ScrolledWindow()

-      scrolled:set_vexpand (true)

-      box:pack_start(scrolled, true, true, 1)

-      scrolled:show()

-

-      local view = Gtk.TextView()

-      view:set_wrap_mode(Gtk.WrapMode.WORD)

-      view:set_editable(false)

-      local buffer = view:get_buffer()

-      buffer:set_text(contents, -1)

-      scrolled:add(view)

-      view:show()

-    end

-

-    while (true) do

-      local response = dialog:run()

-      local url = 'https://gitlab.gnome.org/GNOME/gimp/blob/master/extensions/goat-exercises/goat-exercise-lua.lua'

-

-      if response == Gtk.ResponseType.OK then

-        dialog:destroy()

-        break

-      elseif (response == Gtk.ResponseType.APPLY)  then

-        Gio.app_info_launch_default_for_uri(url, nil);

-      else -- CANCEL, CLOSE, DELETE_EVENT

-        dialog:destroy()

-        local cancel = GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.CANCEL)

-        retval:append(cancel)

-        return retval

-      end

-    end

-  end

-

-  local x, y, width, height = drawable:mask_intersect()

-  if width ~= nill and height ~= nil and width > 0 and height > 0 then

-    Gegl.init(nil)

-

-    local buffer = drawable:get_buffer()

-    local shadow_buffer = drawable:get_shadow_buffer()

-

-    local graph = Gegl.Node()

-    local input = graph:create_child("gegl:buffer-source")

-    input:set_property("buffer", GObject.Value(Gegl.Buffer, buffer))

-    local invert = graph:create_child("gegl:invert")

-    local output = graph:create_child("gegl:write-buffer")

-    output:set_property("buffer", GObject.Value(Gegl.Buffer, shadow_buffer))

-    input:link(invert)

-    invert:link(output)

-    output:process()

-

-    shadow_buffer:flush()

-

-    drawable:merge_shadow(true)

-    drawable:update(x, y, width, height)

-    Gimp.displays_flush()

-  end

-

-  local success = GObject.Value(Gimp.PDBStatusType, Gimp.PDBStatusType.SUCCESS)

-  retval:append(success)

-  return retval

-end

-

-Goat:class('Exercise', Gimp.PlugIn)

-

-function Goat.Exercise:do_query_procedures()

-  return { 'plug-in-goat-exercise-lua' }

-end

-

-function Goat.Exercise:do_create_procedure(name)

-  local procedure = Gimp.ImageProcedure.new(self, name,

-                                            Gimp.PDBProcType.PLUGIN,

-                                            run, nil)

-

-  procedure:set_image_types("*");

-  procedure:set_sensitivity_mask(Gimp.ProcedureSensitivityMask.DRAWABLE);

-

-  procedure:set_menu_label("Exercise a Lua goat");

-  procedure:set_icon_name(GimpUi.ICON_GEGL);

-  procedure:add_menu_path('<Image>/Filters/Development/Goat exercises/');

-

-  procedure:set_documentation("Exercise a goat in the Lua language",

-                              "Takes a goat for a walk in Lua",

-                              name);

-  procedure:set_attribution("Jehan", "Jehan", "2019");

-

-  return procedure

-end

-

--- 'arg' is a Lua table. When automatically converted to an array, the

--- value 0 is deleted (because Lua arrays start at 1!), which breaks

--- Gimp.main() call. So let's create our own array starting at 1.

-argv = {}

-for k, v in pairs(arg) do

-  argv[k+1] = v

-end

-

-Gimp.main(GObject.Type.name(Goat.Exercise), argv)

diff -urNp a/extensions/goat-exercises/Makefile.am b/extensions/goat-exercises/Makefile.am

--- a/extensions/goat-exercises/Makefile.am	2022-03-09 09:39:44.007314944 +0100

+++ b/extensions/goat-exercises/Makefile.am	2022-03-09 10:27:14.623108639 +0100

@@ -72,10 +72,10 @@ endif

 # Lua (lua-jit + LGI) version.

-if BUILD_LUA

-goat_exercise_luadir = $(goat_exercise_c_libexecdir)

-goat_exercise_lua_SCRIPTS = goat-exercise-lua.lua

-endif

+#if BUILD_LUA

+#goat_exercise_luadir = $(goat_exercise_c_libexecdir)

+#goat_exercise_lua_SCRIPTS = goat-exercise-lua.lua

+#endif

 # Python 3 (pygobject) version.

@@ -135,7 +135,6 @@ org.gimp.extension.goat-exercises.metain

 EXTRA_DIST = \

 	goat-exercise-gjs.js	\

-	goat-exercise-lua.lua	\

 	goat-exercise-py3.py	\

 	$(appstream_in_files)

diff -urNp a/extensions/goat-exercises/Makefile.in b/extensions/goat-exercises/Makefile.in

--- a/extensions/goat-exercises/Makefile.in	2022-03-09 09:39:44.006314936 +0100

+++ b/extensions/goat-exercises/Makefile.in	2022-03-09 10:28:59.224986448 +0100

@@ -118,7 +118,6 @@ CONFIG_CLEAN_VPATH_FILES =

 am__installdirs = "$(DESTDIR)$(goat_exercise_c_libexecdir)" \

 	"$(DESTDIR)$(goat_exercise_vala_libexecdir)" \

 	"$(DESTDIR)$(goat_exercise_gjsdir)" \

-	"$(DESTDIR)$(goat_exercise_luadir)" \

 	"$(DESTDIR)$(goat_exercise_py3dir)" "$(DESTDIR)$(appdatadir)" \

 	"$(DESTDIR)$(goat_exercise_c_libexecdir)" \

 	"$(DESTDIR)$(goat_exercise_vala_libexecdir)"

@@ -183,7 +182,7 @@ am__uninstall_files_from_dir = { \

     || { echo " ( cd '$$dir' && rm -f" $$files ")"; \

          $(am__cd) "$$dir" && rm -f $$files; }; \

   }

-SCRIPTS = $(goat_exercise_gjs_SCRIPTS) $(goat_exercise_lua_SCRIPTS) \

+SCRIPTS = $(goat_exercise_gjs_SCRIPTS) \

 	$(goat_exercise_py3_SCRIPTS)

 AM_V_P = $(am__v_P_@AM_V@)

 am__v_P_ = $(am__v_P_@AM_DEFAULT_V@)

@@ -753,8 +752,8 @@ goat_exercise_c_LDADD = \

 @BUILD_JAVASCRIPT_TRUE@goat_exercise_gjs_SCRIPTS = goat-exercise-gjs.js

 # Lua (lua-jit + LGI) version.

-@BUILD_LUA_TRUE@goat_exercise_luadir = $(goat_exercise_c_libexecdir)

-@BUILD_LUA_TRUE@goat_exercise_lua_SCRIPTS = goat-exercise-lua.lua

+#@BUILD_LUA_TRUE@goat_exercise_luadir = $(goat_exercise_c_libexecdir)

+#@BUILD_LUA_TRUE@goat_exercise_lua_SCRIPTS = goat-exercise-lua.lua

 # Python 3 (pygobject) version.

 @BUILD_PYTHON_TRUE@goat_exercise_py3dir = $(goat_exercise_c_libexecdir)

@@ -795,7 +794,6 @@ appdatadir = $(goat_exercise_c_libexecdi

 appdata_DATA = $(appstream_files)

 EXTRA_DIST = \

 	goat-exercise-gjs.js	\

-	goat-exercise-lua.lua	\

 	goat-exercise-py3.py	\

 	$(appstream_in_files)

@@ -977,41 +975,41 @@ uninstall-goat_exercise_gjsSCRIPTS:

 	files=`for p in $$list; do echo "$$p"; done | \

 	       sed -e 's,.*/,,;$(transform)'`; \

 	dir='$(DESTDIR)$(goat_exercise_gjsdir)'; $(am__uninstall_files_from_dir)

-install-goat_exercise_luaSCRIPTS: $(goat_exercise_lua_SCRIPTS)

-	@$(NORMAL_INSTALL)

-	@list='$(goat_exercise_lua_SCRIPTS)'; test -n "$(goat_exercise_luadir)" || list=; \

-	if test -n "$$list"; then \

-	  echo " $(MKDIR_P) '$(DESTDIR)$(goat_exercise_luadir)'"; \

-	  $(MKDIR_P) "$(DESTDIR)$(goat_exercise_luadir)" || exit 1; \

-	fi; \

-	for p in $$list; do \

-	  if test -f "$$p"; then d=; else d="$(srcdir)/"; fi; \

-	  if test -f "$$d$$p"; then echo "$$d$$p"; echo "$$p"; else :; fi; \

-	done | \

-	sed -e 'p;s,.*/,,;n' \

-	    -e 'h;s|.*|.|' \

-	    -e 'p;x;s,.*/,,;$(transform)' | sed 'N;N;N;s,\n, ,g' | \

-	$(AWK) 'BEGIN { files["."] = ""; dirs["."] = 1; } \

-	  { d=$$3; if (dirs[d] != 1) { print "d", d; dirs[d] = 1 } \

-	    if ($$2 == $$4) { files[d] = files[d] " " $$1; \

-	      if (++n[d] == $(am__install_max)) { \

-		print "f", d, files[d]; n[d] = 0; files[d] = "" } } \

-	    else { print "f", d "/" $$4, $$1 } } \

-	  END { for (d in files) print "f", d, files[d] }' | \

-	while read type dir files; do \

-	     if test "$$dir" = .; then dir=; else dir=/$$dir; fi; \

-	     test -z "$$files" || { \

-	       echo " $(INSTALL_SCRIPT) $$files '$(DESTDIR)$(goat_exercise_luadir)$$dir'"; \

-	       $(INSTALL_SCRIPT) $$files "$(DESTDIR)$(goat_exercise_luadir)$$dir" || exit $$?; \

-	     } \

-	; done

-

-uninstall-goat_exercise_luaSCRIPTS:

-	@$(NORMAL_UNINSTALL)

-	@list='$(goat_exercise_lua_SCRIPTS)'; test -n "$(goat_exercise_luadir)" || exit 0; \

-	files=`for p in $$list; do echo "$$p"; done | \

-	       sed -e 's,.*/,,;$(transform)'`; \

-	dir='$(DESTDIR)$(goat_exercise_luadir)'; $(am__uninstall_files_from_dir)

+#install-goat_exercise_luaSCRIPTS: $(goat_exercise_lua_SCRIPTS)

+#	@$(NORMAL_INSTALL)

+#	@list='$(goat_exercise_lua_SCRIPTS)'; test -n "$(goat_exercise_luadir)" || list=; \

+#	if test -n "$$list"; then \

+#	  echo " $(MKDIR_P) '$(DESTDIR)$(goat_exercise_luadir)'"; \

+#	  $(MKDIR_P) "$(DESTDIR)$(goat_exercise_luadir)" || exit 1; \

+#	fi; \

+#	for p in $$list; do \

+#	  if test -f "$$p"; then d=; else d="$(srcdir)/"; fi; \

+#	  if test -f "$$d$$p"; then echo "$$d$$p"; echo "$$p"; else :; fi; \

+#	done | \

+#	sed -e 'p;s,.*/,,;n' \

+#	    -e 'h;s|.*|.|' \

+#	    -e 'p;x;s,.*/,,;$(transform)' | sed 'N;N;N;s,\n, ,g' | \

+#	$(AWK) 'BEGIN { files["."] = ""; dirs["."] = 1; } \

+#	  { d=$$3; if (dirs[d] != 1) { print "d", d; dirs[d] = 1 } \

+#	    if ($$2 == $$4) { files[d] = files[d] " " $$1; \

+#	      if (++n[d] == $(am__install_max)) { \

+#		print "f", d, files[d]; n[d] = 0; files[d] = "" } } \

+#	    else { print "f", d "/" $$4, $$1 } } \

+#	  END { for (d in files) print "f", d, files[d] }' | \

+#	while read type dir files; do \

+#	     if test "$$dir" = .; then dir=; else dir=/$$dir; fi; \

+#	     test -z "$$files" || { \

+#	       echo " $(INSTALL_SCRIPT) $$files '$(DESTDIR)$(goat_exercise_luadir)$$dir'"; \

+#	       $(INSTALL_SCRIPT) $$files "$(DESTDIR)$(goat_exercise_luadir)$$dir" || exit $$?; \

+#	     } \

+#	; done

+

+#uninstall-goat_exercise_luaSCRIPTS:

+#	@$(NORMAL_UNINSTALL)

+#	@list='$(goat_exercise_lua_SCRIPTS)'; test -n "$(goat_exercise_luadir)" || exit 0; \

+#	files=`for p in $$list; do echo "$$p"; done | \

+#	       sed -e 's,.*/,,;$(transform)'`; \

+#	dir='$(DESTDIR)$(goat_exercise_luadir)'; $(am__uninstall_files_from_dir)

 install-goat_exercise_py3SCRIPTS: $(goat_exercise_py3_SCRIPTS)

 	@$(NORMAL_INSTALL)

 	@list='$(goat_exercise_py3_SCRIPTS)'; test -n "$(goat_exercise_py3dir)" || list=; \

@@ -1266,7 +1264,7 @@ check-am: all-am

 check: check-am

 all-am: Makefile $(PROGRAMS) $(SCRIPTS) $(DATA)

 installdirs:

-	for dir in "$(DESTDIR)$(goat_exercise_c_libexecdir)" "$(DESTDIR)$(goat_exercise_vala_libexecdir)" "$(DESTDIR)$(goat_exercise_gjsdir)" "$(DESTDIR)$(goat_exercise_luadir)" "$(DESTDIR)$(goat_exercise_py3dir)" "$(DESTDIR)$(appdatadir)" "$(DESTDIR)$(goat_exercise_c_libexecdir)" "$(DESTDIR)$(goat_exercise_vala_libexecdir)"; do \

+	for dir in "$(DESTDIR)$(goat_exercise_c_libexecdir)" "$(DESTDIR)$(goat_exercise_vala_libexecdir)" "$(DESTDIR)$(goat_exercise_gjsdir)" "$(DESTDIR)$(goat_exercise_py3dir)" "$(DESTDIR)$(appdatadir)" "$(DESTDIR)$(goat_exercise_c_libexecdir)" "$(DESTDIR)$(goat_exercise_vala_libexecdir)"; do \

 	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \

 	done

 install: install-am

@@ -1330,7 +1328,6 @@ info: info-am

 info-am:

 install-data-am: install-appdataDATA install-goat_exercise_gjsSCRIPTS \

-	install-goat_exercise_luaSCRIPTS \

 	install-goat_exercise_py3SCRIPTS

 install-dvi: install-dvi-am

@@ -1385,7 +1382,6 @@ uninstall-am: uninstall-appdataDATA \

 	uninstall-goat_exercise_c_libexecDATA \

 	uninstall-goat_exercise_c_libexecPROGRAMS \

 	uninstall-goat_exercise_gjsSCRIPTS \

-	uninstall-goat_exercise_luaSCRIPTS \

 	uninstall-goat_exercise_py3SCRIPTS \

 	uninstall-goat_exercise_vala_libexecDATA \

 	uninstall-goat_exercise_vala_libexecPROGRAMS

@@ -1403,7 +1399,6 @@ uninstall-am: uninstall-appdataDATA \

 	install-goat_exercise_c_libexecDATA \

 	install-goat_exercise_c_libexecPROGRAMS \

 	install-goat_exercise_gjsSCRIPTS \

-	install-goat_exercise_luaSCRIPTS \

 	install-goat_exercise_py3SCRIPTS \

 	install-goat_exercise_vala_libexecDATA \

 	install-goat_exercise_vala_libexecPROGRAMS install-html \

@@ -1416,7 +1411,6 @@ uninstall-am: uninstall-appdataDATA \

 	uninstall-appdataDATA uninstall-goat_exercise_c_libexecDATA \

 	uninstall-goat_exercise_c_libexecPROGRAMS \

 	uninstall-goat_exercise_gjsSCRIPTS \

-	uninstall-goat_exercise_luaSCRIPTS \

 	uninstall-goat_exercise_py3SCRIPTS \

 	uninstall-goat_exercise_vala_libexecDATA \

 	uninstall-goat_exercise_vala_libexecPROGRAMS