Import upstream version 0.11.0~svn1143

1 files changed, 144 insertions, 0 deletions

diff --git a/plugin_python.c b/plugin_python.c
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+++ b/plugin_python.c
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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();
+    }
+}