mirror of
https://github.com/netfun2000/lcd4linux.git
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2e2e535b2c
git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@1085 3ae390bd-cb1e-0410-b409-cd5a39f66f1f
143 lines
3.9 KiB
C
143 lines
3.9 KiB
C
/* $Id$
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* $URL$
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*
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* Python plugin
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*
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* Copyright 2005 Dan Fritz
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* Copyright 2005 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
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*
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* This file is part of LCD4Linux.
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*
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* LCD4Linux is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* LCD4Linux is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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/*
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* exported functions:
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*
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* int plugin_init_python (void)
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* adds a python interpreter
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*
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*/
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#include "config.h"
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#include <Python.h>
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#include "debug.h"
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#include "plugin.h"
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/*
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* Executes a python function specified by function name and module.
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*
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* This method is more or less a copy of an example found in the python
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* documentation. Kudos goes to Guido van Rossum and Fred L. Drake.
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*
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* Fixme: this function should be able to accept and receive any types
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* of arguments supported by the evaluator. Right now only strings are accepted.
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*/
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static void pyt_exec_str(RESULT * result, const char *module, const char *function, int argc, const char *argv[])
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{
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PyObject *pName, *pModule, *pDict, *pFunc;
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PyObject *pArgs, *pValue;
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const char *rv = NULL;
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int i;
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pName = PyString_FromString(module);
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/* Error checking of pName left out */
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pModule = PyImport_Import(pName);
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Py_DECREF(pName);
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if (pModule != NULL) {
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pDict = PyModule_GetDict(pModule);
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/* pDict is a borrowed reference */
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pFunc = PyDict_GetItemString(pDict, function);
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/* pFun: Borrowed reference */
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if (pFunc && PyCallable_Check(pFunc)) {
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pArgs = PyTuple_New(argc);
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for (i = 0; i < argc; ++i) {
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pValue = PyString_FromString(argv[i]);
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if (!pValue) {
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Py_DECREF(pArgs);
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Py_DECREF(pModule);
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error("Cannot convert argument \"%s\" to python format", argv[i]);
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SetResult(&result, R_STRING, "");
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return;
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}
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/* pValue reference stolen here: */
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PyTuple_SetItem(pArgs, i, pValue);
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}
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pValue = PyObject_CallObject(pFunc, pArgs);
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Py_DECREF(pArgs);
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if (pValue != NULL) {
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rv = PyString_AsString(pValue);
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SetResult(&result, R_STRING, rv);
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Py_DECREF(pValue);
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/* rv is now a 'dangling reference' */
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return;
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} else {
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Py_DECREF(pModule);
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error("Python call failed (\"%s.%s\")", module, function);
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/* print traceback on stderr */
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PyErr_PrintEx(0);
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SetResult(&result, R_STRING, "");
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return;
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}
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/* pDict and pFunc are borrowed and must not be Py_DECREF-ed */
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} else {
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error("Can not find python function \"%s.%s\"", module, function);
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}
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Py_DECREF(pModule);
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} else {
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error("Failed to load python module \"%s\"", module);
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}
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SetResult(&result, R_STRING, "");
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return;
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}
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static int python_cleanup_responsibility = 0;
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static void my_exec(RESULT * result, RESULT * module, RESULT * function, RESULT * arg)
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{
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/* Fixme: a plugin should be able to accept any number of arguments, don't know how
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to code that (yet) */
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const char *args[] = { R2S(arg) };
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pyt_exec_str(result, R2S(module), R2S(function), 1, args);
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}
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int plugin_init_python(void)
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{
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if (!Py_IsInitialized()) {
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Py_Initialize();
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python_cleanup_responsibility = 1;
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}
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AddFunction("python::exec", 3, my_exec);
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return 0;
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}
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void plugin_exit_python(void)
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{
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/* Make sure NOT to call Py_Finalize() When (and if) the entire lcd4linux process
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* is started from inside python
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*/
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if (python_cleanup_responsibility) {
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python_cleanup_responsibility = 0;
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Py_Finalize();
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}
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}
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