src/python.c

   1 /* Python scripting support
   2  *
   3  * Copyright (c) 2009 Sadrul Habib Chowdhury (sadrul@users.sf.net)
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3, or (at your option)
   8  * any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program (see the file COPYING); if not, write to the
  17  * Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
  19  *
  20  ****************************************************************
  21  */
  22 #include <sys/types.h>
  23
  24 #include "config.h"
  25 #include "screen.h"
  26 #include "script.h"
  27 #include <sys/stat.h>
  28 #include <unistd.h>
  29
  30 #include <stdio.h>
  31 #include <string.h>
  32 #include <stdlib.h>
  33
  34 #include "extern.h"
  35 #include "logfile.h"
  36
  37 #include <Python.h>
  38 #include <structmember.h>
  39
  40 extern struct win *windows;
  41
  42 static PyObject * SPy_Get(PyObject *obj, void *closure);
  43 static PyObject * SPy_Set(PyObject *obj, PyObject *value, void *closure);
  44
  45 typedef struct
  46 {
  47   char *name;
  48   char *doc;
  49
  50   int type;
  51   size_t offset1;
  52   size_t offset2;
  53   PyObject * (*conv)(void *);
  54 } SPyClosure;
  55
  56 #define REGISTER_TYPE(type, Type, closures) \
  57 static int \
  58 register_##type(PyObject *module) \
  59 { \
  60   static PyGetSetDef getsets[sizeof(closures)]; \
  61   int i, count = sizeof(closures); \
  62   for (i = 0; i < count; i++) \
  63     { \
  64       getsets[i].name = closures[i].name; \
  65       getsets[i].doc = closures[i].doc; \
  66       getsets[i].closure = &closures[i]; \
  67       getsets[i].get = SPy_Get; \
  68       getsets[i].set = SPy_Set; \
  69     } \
  70   PyType##Type.tp_getset = getsets; \
  71   PyType_Ready(&PyType##Type); \
  72   Py_INCREF(&PyType##Type); \
  73   PyModule_AddObject(module, #Type, (PyObject *)&PyType##Type); \
  74   return 1; \
  75 }
  76
  77 #define DEFINE_TYPE(str, Type) \
  78 typedef struct \
  79 { \
  80   PyObject_HEAD \
  81   str *_obj; \
  82 } Py##Type; \
  83 \
  84 static PyTypeObject PyType##Type = \
  85 { \
  86   PyObject_HEAD_INIT(NULL) \
  87   .ob_size = 0, \
  88   .tp_name = "screen." #Type, \
  89   .tp_basicsize = sizeof(Py##Type), \
  90   .tp_flags = Py_TPFLAGS_DEFAULT, \
  91   .tp_doc = #Type " object", \
  92   .tp_methods = NULL, \
  93   .tp_getset = NULL, \
  94 }; \
  95 \
  96 static PyObject * \
  97 PyObject_From##Type(str *_obj) \
  98 { \
  99   Py##Type *obj = PyType##Type.tp_alloc(&PyType##Type, 0); \
 100   obj->_obj = _obj; \
 101   return (PyObject *)obj; \
 102 }
 103
 104 static PyObject *
 105 PyString_FromStringSafe(const char *str)
 106 {
 107   if (str)
 108     return PyString_FromString(str);
 109   Py_INCREF(Py_None);
 110   return Py_None;
 111 }
 112
 113 /** Window {{{ */
 114 DEFINE_TYPE(struct win, Window)
 115
 116 #define SPY_CLOSURE(name, doc, type, member, func) \
 117     {name, doc, type, offsetof(PyWindow, _obj), offsetof(struct win, member), func}
 118 static SPyClosure wclosures[] =
 119 {
 120   SPY_CLOSURE("title", "Window title", T_STRING, w_title, NULL),
 121   SPY_CLOSURE("number", "Window number", T_INT, w_number, NULL),
 122   SPY_CLOSURE("dir", "Window directory", T_STRING, w_dir, NULL),
 123   SPY_CLOSURE("tty", "TTY belonging to the window", T_STRING_INPLACE, w_tty, NULL),
 124   SPY_CLOSURE("group", "The group the window belongs to", T_OBJECT_EX, w_group, PyObject_FromWindow),
 125   SPY_CLOSURE("pid", "Window pid", T_INT, w_pid, NULL),
 126   {NULL}
 127 };
 128 REGISTER_TYPE(window, Window, wclosures)
 129 #undef SPY_CLOSURE
 130
 131 /** }}} */
 132
 133 static PyObject *
 134 SPy_Get(PyObject *obj, void *closure)
 135 {
 136   SPyClosure *sc = closure;
 137   char **first = (char *)obj + sc->offset1;
 138   char **second = (char *)*first + sc->offset2;
 139   PyObject *(*cb)(void *) = sc->conv;
 140   void *data = *second;
 141
 142   if (!cb)
 143     {
 144       switch (sc->type)
 145         {
 146           case T_STRING:
 147             cb = PyString_FromStringSafe;
 148             data = *second;
 149             break;
 150           case T_STRING_INPLACE:
 151             cb = PyString_FromStringSafe;
 152             data = second;
 153             break;
 154           case T_INT:
 155             cb = PyInt_FromLong;
 156             data = *second;
 157             break;
 158         }
 159     }
 160   return cb(data);
 161 }
 162
 163 static PyObject *
 164 SPy_Set(PyObject *obj, PyObject *value, void *closure)
 165 {
 166   return NULL;
 167 }
 168
 169 static PyObject *
 170 screen_windows(PyObject *self)
 171 {
 172   struct win *w = windows;
 173   int count = 0;
 174   for (; w; w = w->w_next)
 175     ++count;
 176   PyObject *tuple = PyTuple_New(count);
 177
 178   for (w = windows, count = 0; w; w = w->w_next, ++count)
 179     PyTuple_SetItem(tuple, count, PyObject_FromWindow(w));
 180
 181   return tuple;
 182 }
 183
 184 const PyMethodDef py_methods[] = {
 185   {"windows", (PyCFunction)screen_windows, METH_NOARGS, NULL},
 186   {NULL, NULL, 0, NULL}
 187 };
 188
 189 static int
 190 SPyInit(void)
 191 {
 192   PyObject *m;
 193
 194   Py_Initialize();
 195
 196   m = Py_InitModule3 ("screen", py_methods, NULL);
 197   register_window(m);
 198
 199   return 0;
 200 }
 201
 202 static int
 203 SPyFinit(void)
 204 {
 205   Py_Finalize();
 206   return 0;
 207 }
 208
 209 static int
 210 SPySource(const char *file, int async)
 211 {
 212   FILE *f = fopen(file, "rb");
 213   int ret = PyRun_SimpleFile(f, file);
 214   fclose(f);
 215
 216   if (ret == 0)
 217       return 1; /* Success */
 218
 219   if (PyErr_Occurred())
 220     {
 221       PyErr_Print();
 222       return 0;
 223     }
 224
 225   return 1;
 226 }
 227
 228 struct binding py_binding =
 229 {
 230   "python",
 231   0,
 232   0,
 233   SPyInit,
 234   SPyFinit,
 235   0,
 236   SPySource,
 237   0,
 238   0
 239 };
 240