[gimp] plug-ins: Port python-eval.py plugin to python 3.

[Jehan <jehanp src gnome org>]

commit 33085b518226f3c8a7428747a033721b45c82293
Author: Elad Shahar <dawn ever gmail com>
Date:   Mon Dec 16 02:11:10 2019 +0200

    plug-ins: Port python-eval.py plugin to python 3.
    
    To test that this works, run gimp in batch mode:
    
    % gimp2.99 -i -b -
    
    And then type: (python-fu-eval "print (2)") .

 plug-ins/pygimp/plug-ins/python-eval.py | 42 ------------------
 plug-ins/python/Makefile.am             |  5 ++-
 plug-ins/python/meson.build             |  2 +-
 plug-ins/python/python-eval.py          | 78 +++++++++++++++++++++++++++++++++
 4 files changed, 83 insertions(+), 44 deletions(-)
---
diff --git a/plug-ins/python/Makefile.am b/plug-ins/python/Makefile.am
index 73f7ce7e93..aad44977e1 100644
--- a/plug-ins/python/Makefile.am
+++ b/plug-ins/python/Makefile.am
@@ -27,12 +27,14 @@ palette_to_gradient_SCRIPTS = palette-to-gradient.py
 py_slicedir = $(gimpplugindir)/plug-ins/py-slice
 py_slice_SCRIPTS = py-slice.py
 
+python_evaldir = $(gimpplugindir)/plug-ins/python-eval
+python_eval_SCRIPTS = python-eval.py
+
 spyro_plusdir = $(gimpplugindir)/plug-ins/spyro-plus
 spyro_plus_SCRIPTS = spyro-plus.py
 
 # TODO: to be ported:
 ##     histogram-export.py
-##     python-eval.py
 
 if GIMP_UNSTABLE
 benchmark_foreground_extractdir = $(gimpplugindir)/plug-ins/benchmark-foreground-extract
@@ -52,6 +54,7 @@ EXTRA_DIST = \
        palette-sort.py         \
        palette-to-gradient.py          \
        py-slice.py                     \
+       python-eval.py                  \
        spyro-plus.py
 
 if GIMP_UNSTABLE
diff --git a/plug-ins/python/meson.build b/plug-ins/python/meson.build
index b21cfbda75..67dd3669fb 100644
--- a/plug-ins/python/meson.build
+++ b/plug-ins/python/meson.build
@@ -11,10 +11,10 @@ plugins = [
   { 'name': 'palette-sort' },
   { 'name': 'palette-to-gradient' },
   { 'name': 'py-slice' },
+  { 'name': 'python-eval' },
   { 'name': 'spyro-plus' },
 
   # { 'name': 'histogram-export' },
-  # { 'name': 'python-eval' },
 ]
 
 if not stable
diff --git a/plug-ins/python/python-eval.py b/plug-ins/python/python-eval.py
new file mode 100644
index 0000000000..966671e7de
--- /dev/null
+++ b/plug-ins/python/python-eval.py
@@ -0,0 +1,78 @@
+#!/usr/bin/env python3
+
+#   Gimp-Python - allows the writing of Gimp plugins in Python.
+#   Copyright (C) 2006  Manish Singh <yosh gimp org>
+#
+#   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/>.
+
+import gi
+gi.require_version('Gimp', '3.0')
+from gi.repository import Gimp
+from gi.repository import GObject
+from gi.repository import GLib
+from gi.repository import Gio
+
+import sys
+
+
+def code_eval(procedure, args, data):
+
+    # Get the parameters
+    if args.length() != 1:
+        error = 'No parameters given'
+        return procedure.new_return_values(Gimp.PDBStatusType.CALLING_ERROR,
+                                           GLib.Error(error))
+
+    code = args.index(0)
+    if code == '-':
+        code = sys.stdin.read()
+    exec(code, globals())
+    return procedure.new_return_values(Gimp.PDBStatusType.SUCCESS, GLib.Error())
+
+
+class PythonEval (Gimp.PlugIn):
+    ## Parameters ##
+    __gproperties__ = {
+        "code": (str,
+                 "Python code to evaluate, or '-' to read from stdin",
+                 "Python code to evaluate, or '-' to read from stdin",
+                 "",
+                 GObject.ParamFlags.READWRITE)
+    }
+
+    ## GimpPlugIn virtual methods ##
+    def do_query_procedures(self):
+        self.set_translation_domain("gimp30-python",
+                                    Gio.file_new_for_path(Gimp.locale_directory()))
+
+        return ['python-fu-eval']
+
+    def do_create_procedure(self, name):
+        procedure = Gimp.Procedure.new(self, name,
+                                       Gimp.PDBProcType.PLUGIN,
+                                       code_eval, None)
+        procedure.set_documentation ("Evaluate Python code",
+                                     "Evaluate python code under the python interpreter (primarily for batch 
mode)",
+                                     name)
+
+        procedure.set_attribution("Manish Singh",
+                                  "Manish Singh",
+                                  "2006")
+
+        procedure.add_argument_from_property(self, "code")
+
+        return procedure
+
+
+Gimp.main(PythonEval.__gtype__, sys.argv)