[lcd4linux @ 2005-05-03 11:13:23 by reinelt]

rearranged autoconf a bit,
libX11 will be linked only if really needed (i.e. when the X11 driver has been selected)
plugin_python filled with life

git-svn-id: https://ssl.bulix.org/svn/lcd4linux/trunk@537 3ae390bd-cb1e-0410-b409-cd5a39f66f1f

1 files changed, 98 insertions, 12 deletions

diff --git a/plugin_python.c b/plugin_python.c
index 88e60e8..7b61096 100644
--- a/plugin_python.c
+++ b/plugin_python.c
@@ -1,8 +1,8 @@
-/* $Id: plugin_python.c,v 1.1 2005/05/02 10:29:20 reinelt Exp $
+/* $Id: plugin_python.c,v 1.2 2005/05/03 11:13:24 reinelt Exp $
  *
  * Python plugin
  *
- * Copyright 2005 Fixme!
+ * Copyright 2005 Dan Fritz  
  * Copyright 2005 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net>
  *
  * This file is part of LCD4Linux.
@@ -23,6 +23,11 @@
  *
  *
  * $Log: plugin_python.c,v $
+ * Revision 1.2  2005/05/03 11:13:24  reinelt
+ * rearranged autoconf a bit,
+ * libX11 will be linked only if really needed (i.e. when the X11 driver has been selected)
+ * plugin_python filled with life
+ *
  * Revision 1.1  2005/05/02 10:29:20  reinelt
  * preparations for python bindings and python plugin
  *
@@ -36,6 +41,7 @@
  *
  */
 
+#include <Python.h>
 
 #include "config.h"
 
@@ -46,25 +52,105 @@
 #include "plugin.h"
 #include "hash.h"
 
-// Fixme: #include "lcd4linux_wrap.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.
+ * 
+ * Returns a char* directly from PyString_AsString() !!! DO NOT DEALLOCATE !!!
+ */
+static const char* 
+pyt_exec_str(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;
 
-static void my_exec (RESULT *result, RESULT *arg1)
-{
-#if 0
-  const char* value = pyt_exec_str(R2S(arg1));
-#else
-  const char *value = "Fixme";
-#endif
+  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);
+          fprintf(stderr, "Cannot convert argument %s\n", argv[i]);
+          return NULL;
+        }
+        /* pValue reference stolen here: */
+        PyTuple_SetItem(pArgs, i, pValue);
+      }
+      pValue = PyObject_CallObject(pFunc, pArgs);
+      Py_DECREF(pArgs);
+      if (pValue != NULL) {
+        rv = PyString_AsString(pValue);
+        //printf("Result of call: %s\n", rv);
+        Py_DECREF(pValue);
+        return rv;
+      }
+      else {
+        Py_DECREF(pModule);
+        PyErr_Print();
+        fprintf(stderr,"Call failed\n");
+        return NULL;
+      }
+      /* pDict and pFunc are borrowed and must not be Py_DECREF-ed */
+    }
+    else {
+      if (PyErr_Occurred())
+        PyErr_Print();
+      fprintf(stderr, "Cannot find function \"%s\"\n", argv[2]);
+    }
+    Py_DECREF(pModule);
+  }
+  else {
+    PyErr_Print();
+    fprintf(stderr, "Failed to load \"%s\"\n", argv[1]);
+    return NULL;
+  }
+  return NULL;
+}
+
+static int python_cleanup_responsibility = 0;
+    
+static void my_exec (RESULT *result, RESULT *module, RESULT *function, RESULT *arg )
+{ 
+  const char* args[] = {R2S(arg)};
+  const char* value = pyt_exec_str(R2S(module),R2S(function),1,args);
   SetResult(&result, R_STRING, value); 
 }
 
 int plugin_init_python (void)
 {
-  AddFunction ("python::exec", 1, my_exec);
+  if (!Py_IsInitialized()) {
+    Py_Initialize();
+    python_cleanup_responsibility = 1;
+  }
+  AddFunction ("python::exec", 3, my_exec);
   return 0;
 }
 
 void plugin_exit_python (void) 
 {
-  /* empty */
+  /* 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();
+  }
 }