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authorReinhard Tartler <siretart@tauware.de>2011-04-27 19:24:15 +0200
committerReinhard Tartler <siretart@tauware.de>2011-04-27 19:24:15 +0200
commit181cec4348da40331b3e8ab365732c025ec149b2 (patch)
treee2e749be67c8253a8096aaf92aab9c51f1a17f7f /plugin_python.c
downloadlcd4linux-181cec4348da40331b3e8ab365732c025ec149b2.tar.gz
Import upstream version 0.11.0~svn1143
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+/* $Id: plugin_python.c 1086 2010-01-19 14:26:33Z mzuther $
+ * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_python.c $
+ *
+ * Python plugin
+ *
+ * Copyright 2005 Dan Fritz
+ * Copyright 2005 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
+ *
+ * This file is part of LCD4Linux.
+ *
+ * LCD4Linux 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 2, or (at your option)
+ * any later version.
+ *
+ * LCD4Linux 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, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+/*
+ * exported functions:
+ *
+ * int plugin_init_python (void)
+ * adds a python interpreter
+ *
+ */
+
+#include "config.h"
+#include <Python.h>
+#include "debug.h"
+#include "plugin.h"
+
+/*
+ * Executes a python function specified by function name and module.
+ *
+ * This method is more or less a copy of an example found in the python
+ * documentation. Kudos goes to Guido van Rossum and Fred L. Drake.
+ *
+ * Fixme: this function should be able to accept and receive any types
+ * of arguments supported by the evaluator. Right now only strings are accepted.
+ */
+
+static void pyt_exec_str(RESULT * result, const char *module, const char *function, int argc, const char *argv[])
+{
+
+ PyObject *pName, *pModule, *pDict, *pFunc;
+ PyObject *pArgs, *pValue;
+ const char *rv = NULL;
+ int i;
+
+ pName = PyString_FromString(module);
+ /* Error checking of pName left out */
+
+ pModule = PyImport_Import(pName);
+ Py_DECREF(pName);
+
+ if (pModule != NULL) {
+ pDict = PyModule_GetDict(pModule);
+ /* pDict is a borrowed reference */
+
+ pFunc = PyDict_GetItemString(pDict, function);
+ /* pFun: Borrowed reference */
+
+ if (pFunc && PyCallable_Check(pFunc)) {
+ pArgs = PyTuple_New(argc);
+ for (i = 0; i < argc; ++i) {
+ pValue = PyString_FromString(argv[i]);
+ if (!pValue) {
+ Py_DECREF(pArgs);
+ Py_DECREF(pModule);
+ error("Cannot convert argument \"%s\" to python format", argv[i]);
+ SetResult(&result, R_STRING, "");
+ return;
+ }
+ /* pValue reference stolen here: */
+ PyTuple_SetItem(pArgs, i, pValue);
+ }
+ pValue = PyObject_CallObject(pFunc, pArgs);
+ Py_DECREF(pArgs);
+ if (pValue != NULL) {
+ rv = PyString_AsString(pValue);
+ SetResult(&result, R_STRING, rv);
+ Py_DECREF(pValue);
+ /* rv is now a 'dangling reference' */
+ return;
+ } else {
+ Py_DECREF(pModule);
+ error("Python call failed (\"%s.%s\")", module, function);
+ /* print traceback on stderr */
+ PyErr_PrintEx(0);
+ SetResult(&result, R_STRING, "");
+ return;
+ }
+ /* pDict and pFunc are borrowed and must not be Py_DECREF-ed */
+ } else {
+ error("Can not find python function \"%s.%s\"", module, function);
+ }
+ Py_DECREF(pModule);
+ } else {
+ error("Failed to load python module \"%s\"", module);
+ /* print traceback on stderr */
+ PyErr_PrintEx(0);
+ }
+ SetResult(&result, R_STRING, "");
+ return;
+}
+
+static int python_cleanup_responsibility = 0;
+
+static void my_exec(RESULT * result, RESULT * module, RESULT * function, RESULT * arg)
+{
+ /* Fixme: a plugin should be able to accept any number of arguments, don't know how
+ to code that (yet) */
+ const char *args[] = { R2S(arg) };
+ pyt_exec_str(result, R2S(module), R2S(function), 1, args);
+}
+
+int plugin_init_python(void)
+{
+ if (!Py_IsInitialized()) {
+ Py_Initialize();
+ python_cleanup_responsibility = 1;
+ }
+ AddFunction("python::exec", 3, my_exec);
+ return 0;
+}
+
+void plugin_exit_python(void)
+{
+ /* Make sure NOT to call Py_Finalize() When (and if) the entire lcd4linux process
+ * is started from inside python
+ */
+ if (python_cleanup_responsibility) {
+ python_cleanup_responsibility = 0;
+ Py_Finalize();
+ }
+}