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author | Reinhard Tartler <siretart@tauware.de> | 2011-04-27 19:24:15 +0200 |
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committer | Reinhard Tartler <siretart@tauware.de> | 2011-04-27 19:24:15 +0200 |
commit | 181cec4348da40331b3e8ab365732c025ec149b2 (patch) | |
tree | e2e749be67c8253a8096aaf92aab9c51f1a17f7f /plugin_python.c | |
download | lcd4linux-181cec4348da40331b3e8ab365732c025ec149b2.tar.gz |
Import upstream version 0.11.0~svn1143
Diffstat (limited to 'plugin_python.c')
-rw-r--r-- | plugin_python.c | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/plugin_python.c b/plugin_python.c new file mode 100644 index 0000000..70ea9dc --- /dev/null +++ b/plugin_python.c @@ -0,0 +1,144 @@ +/* $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(); + } +} |