new file mode 100644
--- /dev/null
+++ b/src/if_python.c
@@ -0,0 +1,2807 @@
+/* vi:set ts=8 sts=4 sw=4:
+ *
+ * VIM - Vi IMproved	by Bram Moolenaar
+ *
+ * Do ":help uganda"  in Vim to read copying and usage conditions.
+ * Do ":help credits" in Vim to see a list of people who contributed.
+ * See README.txt for an overview of the Vim source code.
+ */
+/*
+ * Python extensions by Paul Moore.
+ * Changes for Unix by David Leonard.
+ *
+ * This consists of four parts:
+ * 1. Python interpreter main program
+ * 2. Python output stream: writes output via [e]msg().
+ * 3. Implementation of the Vim module for Python
+ * 4. Utility functions for handling the interface between Vim and Python.
+ */
+
+#include "vim.h"
+
+#include <stdio.h>
+#include <stdarg.h>
+#include <limits.h>
+
+/* Python.h defines _POSIX_THREADS itself (if needed) */
+#ifdef _POSIX_THREADS
+# undef _POSIX_THREADS
+#endif
+
+#if defined(_WIN32) && defined (HAVE_FCNTL_H)
+# undef HAVE_FCNTL_H
+#endif
+
+#ifdef _DEBUG
+# undef _DEBUG
+#endif
+
+#ifdef HAVE_STDARG_H
+# undef HAVE_STDARG_H	/* Python's config.h defines it as well. */
+#endif
+
+#include <Python.h>
+#if defined(MACOS) && !defined(MACOS_X_UNIX)
+# include "macglue.h"
+# include <CodeFragments.h>
+#endif
+#undef main /* Defined in python.h - aargh */
+#undef HAVE_FCNTL_H /* Clash with os_win32.h */
+
+#if !defined(FEAT_PYTHON) && defined(PROTO)
+/* Use this to be able to generate prototypes without python being used. */
+# define PyObject int
+# define PyThreadState int
+# define PyTypeObject int
+struct PyMethodDef { int a; };
+# define PySequenceMethods int
+#endif
+
+/* Parser flags */
+#define single_input	256
+#define file_input	257
+#define eval_input	258
+
+#if defined(PY_VERSION_HEX) && PY_VERSION_HEX >= 0x020300F0
+  /* Python 2.3: can invoke ":python" recursively. */
+# define PY_CAN_RECURSE
+#endif
+
+#if defined(DYNAMIC_PYTHON) || defined(PROTO)
+# ifndef DYNAMIC_PYTHON
+#  define HINSTANCE int		/* for generating prototypes */
+# endif
+
+/*
+ * Wrapper defines
+ */
+# define PyArg_Parse dll_PyArg_Parse
+# define PyArg_ParseTuple dll_PyArg_ParseTuple
+# define PyDict_SetItemString dll_PyDict_SetItemString
+# define PyErr_BadArgument dll_PyErr_BadArgument
+# define PyErr_Clear dll_PyErr_Clear
+# define PyErr_NoMemory dll_PyErr_NoMemory
+# define PyErr_Occurred dll_PyErr_Occurred
+# define PyErr_SetNone dll_PyErr_SetNone
+# define PyErr_SetString dll_PyErr_SetString
+# define PyEval_InitThreads dll_PyEval_InitThreads
+# define PyEval_RestoreThread dll_PyEval_RestoreThread
+# define PyEval_SaveThread dll_PyEval_SaveThread
+# ifdef PY_CAN_RECURSE
+#  define PyGILState_Ensure dll_PyGILState_Ensure
+#  define PyGILState_Release dll_PyGILState_Release
+# endif
+# define PyInt_AsLong dll_PyInt_AsLong
+# define PyInt_FromLong dll_PyInt_FromLong
+# define PyInt_Type (*dll_PyInt_Type)
+# define PyList_GetItem dll_PyList_GetItem
+# define PyList_New dll_PyList_New
+# define PyList_SetItem dll_PyList_SetItem
+# define PyList_Size dll_PyList_Size
+# define PyList_Type (*dll_PyList_Type)
+# define PyImport_ImportModule dll_PyImport_ImportModule
+# define PyDict_GetItemString dll_PyDict_GetItemString
+# define PyModule_GetDict dll_PyModule_GetDict
+# define PyRun_SimpleString dll_PyRun_SimpleString
+# define PyString_AsString dll_PyString_AsString
+# define PyString_FromString dll_PyString_FromString
+# define PyString_FromStringAndSize dll_PyString_FromStringAndSize
+# define PyString_Size dll_PyString_Size
+# define PyString_Type (*dll_PyString_Type)
+# define PySys_SetObject dll_PySys_SetObject
+# define PySys_SetArgv dll_PySys_SetArgv
+# define PyType_Type (*dll_PyType_Type)
+# define Py_BuildValue dll_Py_BuildValue
+# define Py_FindMethod dll_Py_FindMethod
+# define Py_InitModule4 dll_Py_InitModule4
+# define Py_Initialize dll_Py_Initialize
+# define _PyObject_New dll__PyObject_New
+# define _Py_NoneStruct (*dll__Py_NoneStruct)
+# define PyObject_Init dll__PyObject_Init
+# if defined(PY_VERSION_HEX) && PY_VERSION_HEX >= 0x02020000
+#  define PyType_IsSubtype dll_PyType_IsSubtype
+# endif
+# if defined(PY_VERSION_HEX) && PY_VERSION_HEX >= 0x02030000
+#  define PyObject_Malloc dll_PyObject_Malloc
+#  define PyObject_Free dll_PyObject_Free
+# endif
+
+/*
+ * Pointers for dynamic link
+ */
+static int(*dll_PyArg_Parse)(PyObject *, char *, ...);
+static int(*dll_PyArg_ParseTuple)(PyObject *, char *, ...);
+static int(*dll_PyDict_SetItemString)(PyObject *dp, char *key, PyObject *item);
+static int(*dll_PyErr_BadArgument)(void);
+static void(*dll_PyErr_Clear)(void);
+static PyObject*(*dll_PyErr_NoMemory)(void);
+static PyObject*(*dll_PyErr_Occurred)(void);
+static void(*dll_PyErr_SetNone)(PyObject *);
+static void(*dll_PyErr_SetString)(PyObject *, const char *);
+static void(*dll_PyEval_InitThreads)(void);
+static void(*dll_PyEval_RestoreThread)(PyThreadState *);
+static PyThreadState*(*dll_PyEval_SaveThread)(void);
+# ifdef PY_CAN_RECURSE
+static PyGILState_STATE	(*dll_PyGILState_Ensure)(void);
+static void (*dll_PyGILState_Release)(PyGILState_STATE);
+#endif
+static long(*dll_PyInt_AsLong)(PyObject *);
+static PyObject*(*dll_PyInt_FromLong)(long);
+static PyTypeObject* dll_PyInt_Type;
+static PyObject*(*dll_PyList_GetItem)(PyObject *, int);
+static PyObject*(*dll_PyList_New)(int size);
+static int(*dll_PyList_SetItem)(PyObject *, int, PyObject *);
+static int(*dll_PyList_Size)(PyObject *);
+static PyTypeObject* dll_PyList_Type;
+static PyObject*(*dll_PyImport_ImportModule)(const char *);
+static PyObject*(*dll_PyDict_GetItemString)(PyObject *, const char *);
+static PyObject*(*dll_PyModule_GetDict)(PyObject *);
+static int(*dll_PyRun_SimpleString)(char *);
+static char*(*dll_PyString_AsString)(PyObject *);
+static PyObject*(*dll_PyString_FromString)(const char *);
+static PyObject*(*dll_PyString_FromStringAndSize)(const char *, int);
+static int(*dll_PyString_Size)(PyObject *);
+static PyTypeObject* dll_PyString_Type;
+static int(*dll_PySys_SetObject)(char *, PyObject *);
+static int(*dll_PySys_SetArgv)(int, char **);
+static PyTypeObject* dll_PyType_Type;
+static PyObject*(*dll_Py_BuildValue)(char *, ...);
+static PyObject*(*dll_Py_FindMethod)(struct PyMethodDef[], PyObject *, char *);
+static PyObject*(*dll_Py_InitModule4)(char *, struct PyMethodDef *, char *, PyObject *, int);
+static void(*dll_Py_Initialize)(void);
+static PyObject*(*dll__PyObject_New)(PyTypeObject *, PyObject *);
+static PyObject*(*dll__PyObject_Init)(PyObject *, PyTypeObject *);
+static PyObject* dll__Py_NoneStruct;
+# if defined(PY_VERSION_HEX) && PY_VERSION_HEX >= 0x02020000
+static int (*dll_PyType_IsSubtype)(PyTypeObject *, PyTypeObject *);
+# endif
+# if defined(PY_VERSION_HEX) && PY_VERSION_HEX >= 0x02030000
+static void* (*dll_PyObject_Malloc)(size_t);
+static void (*dll_PyObject_Free)(void*);
+# endif
+
+static HINSTANCE hinstPython = 0; /* Instance of python.dll */
+
+/* Imported exception objects */
+static PyObject *imp_PyExc_AttributeError;
+static PyObject *imp_PyExc_IndexError;
+static PyObject *imp_PyExc_KeyboardInterrupt;
+static PyObject *imp_PyExc_TypeError;
+static PyObject *imp_PyExc_ValueError;
+
+# define PyExc_AttributeError imp_PyExc_AttributeError
+# define PyExc_IndexError imp_PyExc_IndexError
+# define PyExc_KeyboardInterrupt imp_PyExc_KeyboardInterrupt
+# define PyExc_TypeError imp_PyExc_TypeError
+# define PyExc_ValueError imp_PyExc_ValueError
+
+/*
+ * Table of name to function pointer of python.
+ */
+# define PYTHON_PROC FARPROC
+static struct
+{
+    char *name;
+    PYTHON_PROC *ptr;
+} python_funcname_table[] =
+{
+    {"PyArg_Parse", (PYTHON_PROC*)&dll_PyArg_Parse},
+    {"PyArg_ParseTuple", (PYTHON_PROC*)&dll_PyArg_ParseTuple},
+    {"PyDict_SetItemString", (PYTHON_PROC*)&dll_PyDict_SetItemString},
+    {"PyErr_BadArgument", (PYTHON_PROC*)&dll_PyErr_BadArgument},
+    {"PyErr_Clear", (PYTHON_PROC*)&dll_PyErr_Clear},
+    {"PyErr_NoMemory", (PYTHON_PROC*)&dll_PyErr_NoMemory},
+    {"PyErr_Occurred", (PYTHON_PROC*)&dll_PyErr_Occurred},
+    {"PyErr_SetNone", (PYTHON_PROC*)&dll_PyErr_SetNone},
+    {"PyErr_SetString", (PYTHON_PROC*)&dll_PyErr_SetString},
+    {"PyEval_InitThreads", (PYTHON_PROC*)&dll_PyEval_InitThreads},
+    {"PyEval_RestoreThread", (PYTHON_PROC*)&dll_PyEval_RestoreThread},
+    {"PyEval_SaveThread", (PYTHON_PROC*)&dll_PyEval_SaveThread},
+# ifdef PY_CAN_RECURSE
+    {"PyGILState_Ensure", (PYTHON_PROC*)&dll_PyGILState_Ensure},
+    {"PyGILState_Release", (PYTHON_PROC*)&dll_PyGILState_Release},
+# endif
+    {"PyInt_AsLong", (PYTHON_PROC*)&dll_PyInt_AsLong},
+    {"PyInt_FromLong", (PYTHON_PROC*)&dll_PyInt_FromLong},
+    {"PyInt_Type", (PYTHON_PROC*)&dll_PyInt_Type},
+    {"PyList_GetItem", (PYTHON_PROC*)&dll_PyList_GetItem},
+    {"PyList_New", (PYTHON_PROC*)&dll_PyList_New},
+    {"PyList_SetItem", (PYTHON_PROC*)&dll_PyList_SetItem},
+    {"PyList_Size", (PYTHON_PROC*)&dll_PyList_Size},
+    {"PyList_Type", (PYTHON_PROC*)&dll_PyList_Type},
+    {"PyImport_ImportModule", (PYTHON_PROC*)&dll_PyImport_ImportModule},
+    {"PyDict_GetItemString", (PYTHON_PROC*)&dll_PyDict_GetItemString},
+    {"PyModule_GetDict", (PYTHON_PROC*)&dll_PyModule_GetDict},
+    {"PyRun_SimpleString", (PYTHON_PROC*)&dll_PyRun_SimpleString},
+    {"PyString_AsString", (PYTHON_PROC*)&dll_PyString_AsString},
+    {"PyString_FromString", (PYTHON_PROC*)&dll_PyString_FromString},
+    {"PyString_FromStringAndSize", (PYTHON_PROC*)&dll_PyString_FromStringAndSize},
+    {"PyString_Size", (PYTHON_PROC*)&dll_PyString_Size},
+    {"PyString_Type", (PYTHON_PROC*)&dll_PyString_Type},
+    {"PySys_SetObject", (PYTHON_PROC*)&dll_PySys_SetObject},
+    {"PySys_SetArgv", (PYTHON_PROC*)&dll_PySys_SetArgv},
+    {"PyType_Type", (PYTHON_PROC*)&dll_PyType_Type},
+    {"Py_BuildValue", (PYTHON_PROC*)&dll_Py_BuildValue},
+    {"Py_FindMethod", (PYTHON_PROC*)&dll_Py_FindMethod},
+    {"Py_InitModule4", (PYTHON_PROC*)&dll_Py_InitModule4},
+    {"Py_Initialize", (PYTHON_PROC*)&dll_Py_Initialize},
+    {"_PyObject_New", (PYTHON_PROC*)&dll__PyObject_New},
+    {"PyObject_Init", (PYTHON_PROC*)&dll__PyObject_Init},
+    {"_Py_NoneStruct", (PYTHON_PROC*)&dll__Py_NoneStruct},
+# if defined(PY_VERSION_HEX) && PY_VERSION_HEX >= 0x02020000
+    {"PyType_IsSubtype", (PYTHON_PROC*)&dll_PyType_IsSubtype},
+# endif
+# if defined(PY_VERSION_HEX) && PY_VERSION_HEX >= 0x02030000
+    {"PyObject_Malloc", (PYTHON_PROC*)&dll_PyObject_Malloc},
+    {"PyObject_Free", (PYTHON_PROC*)&dll_PyObject_Free},
+# endif
+    {"", NULL},
+};
+
+/*
+ * Free python.dll
+ */
+    static void
+end_dynamic_python(void)
+{
+    if (hinstPython)
+    {
+	FreeLibrary(hinstPython);
+	hinstPython = 0;
+    }
+}
+
+/*
+ * Load library and get all pointers.
+ * Parameter 'libname' provides name of DLL.
+ * Return OK or FAIL.
+ */
+    static int
+python_runtime_link_init(char *libname, int verbose)
+{
+    int i;
+
+    if (hinstPython)
+	return OK;
+    hinstPython = LoadLibrary(libname);
+    if (!hinstPython)
+    {
+	if (verbose)
+	    EMSG2(_(e_loadlib), libname);
+	return FAIL;
+    }
+
+    for (i = 0; python_funcname_table[i].ptr; ++i)
+    {
+	if ((*python_funcname_table[i].ptr = GetProcAddress(hinstPython,
+			python_funcname_table[i].name)) == NULL)
+	{
+	    FreeLibrary(hinstPython);
+	    hinstPython = 0;
+	    if (verbose)
+		EMSG2(_(e_loadfunc), python_funcname_table[i].name);
+	    return FAIL;
+	}
+    }
+    return OK;
+}
+
+/*
+ * If python is enabled (there is installed python on Windows system) return
+ * TRUE, else FALSE.
+ */
+    int
+python_enabled(verbose)
+    int		verbose;
+{
+    return python_runtime_link_init(DYNAMIC_PYTHON_DLL, verbose) == OK;
+}
+
+/* Load the standard Python exceptions - don't import the symbols from the
+ * DLL, as this can cause errors (importing data symbols is not reliable).
+ */
+static void get_exceptions __ARGS((void));
+
+    static void
+get_exceptions()
+{
+    PyObject *exmod = PyImport_ImportModule("exceptions");
+    PyObject *exdict = PyModule_GetDict(exmod);
+    imp_PyExc_AttributeError = PyDict_GetItemString(exdict, "AttributeError");
+    imp_PyExc_IndexError = PyDict_GetItemString(exdict, "IndexError");
+    imp_PyExc_KeyboardInterrupt = PyDict_GetItemString(exdict, "KeyboardInterrupt");
+    imp_PyExc_TypeError = PyDict_GetItemString(exdict, "TypeError");
+    imp_PyExc_ValueError = PyDict_GetItemString(exdict, "ValueError");
+    Py_XINCREF(imp_PyExc_AttributeError);
+    Py_XINCREF(imp_PyExc_IndexError);
+    Py_XINCREF(imp_PyExc_KeyboardInterrupt);
+    Py_XINCREF(imp_PyExc_TypeError);
+    Py_XINCREF(imp_PyExc_ValueError);
+    Py_XDECREF(exmod);
+}
+#endif /* DYNAMIC_PYTHON */
+
+/******************************************************
+ * Internal function prototypes.
+ */
+
+static void DoPythonCommand(exarg_T *, const char *);
+static int RangeStart;
+static int RangeEnd;
+
+static void PythonIO_Flush(void);
+static int PythonIO_Init(void);
+static int PythonMod_Init(void);
+
+/* Utility functions for the vim/python interface
+ * ----------------------------------------------
+ */
+static PyObject *GetBufferLine(buf_T *, int);
+static PyObject *GetBufferLineList(buf_T *, int, int);
+
+static int SetBufferLine(buf_T *, int, PyObject *, int *);
+static int SetBufferLineList(buf_T *, int, int, PyObject *, int *);
+static int InsertBufferLines(buf_T *, int, PyObject *, int *);
+
+static PyObject *LineToString(const char *);
+static char *StringToLine(PyObject *);
+
+static int VimErrorCheck(void);
+
+#define PyErr_SetVim(str) PyErr_SetString(VimError, str)
+
+/******************************************************
+ * 1. Python interpreter main program.
+ */
+
+static int initialised = 0;
+
+#if PYTHON_API_VERSION < 1007 /* Python 1.4 */
+typedef PyObject PyThreadState;
+#endif /* Python 1.4 */
+
+#ifndef PY_CAN_RECURSE
+static PyThreadState* saved_python_thread = NULL;
+
+/*
+ * Suspend a thread of the Python interpreter, other threads are allowed to
+ * run.
+ */
+static void Python_SaveThread(void)
+{
+    saved_python_thread = PyEval_SaveThread();
+}
+
+/*
+ * Restore a thread of the Python interpreter, waits for other threads to
+ * block.
+ */
+static void Python_RestoreThread(void)
+{
+    PyEval_RestoreThread(saved_python_thread);
+    saved_python_thread = NULL;
+}
+#endif
+
+/*
+ * obtain a lock on the Vim data structures
+ */
+static void Python_Lock_Vim(void)
+{
+}
+
+/*
+ * release a lock on the Vim data structures
+ */
+static void Python_Release_Vim(void)
+{
+}
+
+    void
+python_end()
+{
+#ifdef DYNAMIC_PYTHON
+    end_dynamic_python();
+#endif
+}
+
+    static int
+Python_Init(void)
+{
+    if (!initialised)
+    {
+#ifdef DYNAMIC_PYTHON
+	if (!python_enabled(TRUE))
+	{
+	    EMSG(_("E263: Sorry, this command is disabled, the Python library could not be loaded."));
+	    goto fail;
+	}
+#endif
+
+#if !defined(MACOS) || defined(MACOS_X_UNIX)
+	Py_Initialize();
+#else
+	PyMac_Initialize();
+#endif
+	/* initialise threads */
+	PyEval_InitThreads();
+
+#ifdef DYNAMIC_PYTHON
+	get_exceptions();
+#endif
+
+	if (PythonIO_Init())
+	    goto fail;
+
+	if (PythonMod_Init())
+	    goto fail;
+
+#ifndef PY_CAN_RECURSE
+	/* the first python thread is vim's */
+	Python_SaveThread();
+#endif
+
+	initialised = 1;
+    }
+
+    return 0;
+
+fail:
+    /* We call PythonIO_Flush() here to print any Python errors.
+     * This is OK, as it is possible to call this function even
+     * if PythonIO_Init() has not completed successfully (it will
+     * not do anything in this case).
+     */
+    PythonIO_Flush();
+    return -1;
+}
+
+/*
+ * External interface
+ */
+    static void
+DoPythonCommand(exarg_T *eap, const char *cmd)
+{
+#ifdef PY_CAN_RECURSE
+    PyGILState_STATE	pygilstate;
+#else
+    static int		recursive = 0;
+#endif
+#if defined(MACOS) && !defined(MACOS_X_UNIX)
+    GrafPtr		oldPort;
+#endif
+#if defined(HAVE_LOCALE_H) || defined(X_LOCALE)
+    char		*saved_locale;
+#endif
+
+#ifndef PY_CAN_RECURSE
+    if (recursive)
+    {
+	EMSG(_("E659: Cannot invoke Python recursively"));
+	return;
+    }
+    ++recursive;
+#endif
+
+#if defined(MACOS) && !defined(MACOS_X_UNIX)
+    GetPort(&oldPort);
+    /* Check if the Python library is available */
+    if ((Ptr)PyMac_Initialize == (Ptr)kUnresolvedCFragSymbolAddress)
+	goto theend;
+#endif
+    if (Python_Init())
+	goto theend;
+
+    RangeStart = eap->line1;
+    RangeEnd = eap->line2;
+    Python_Release_Vim();	    /* leave vim */
+
+#if defined(HAVE_LOCALE_H) || defined(X_LOCALE)
+    /* Python only works properly when the LC_NUMERIC locale is "C". */
+    saved_locale = setlocale(LC_NUMERIC, NULL);
+    if (saved_locale == NULL || STRCMP(saved_locale, "C") == 0)
+	saved_locale = NULL;
+    else
+    {
+	/* Need to make a copy, value may change when setting new locale. */
+	saved_locale = (char *)vim_strsave((char_u *)saved_locale);
+	(void)setlocale(LC_NUMERIC, "C");
+    }
+#endif
+
+#ifdef PY_CAN_RECURSE
+    pygilstate = PyGILState_Ensure();
+#else
+    Python_RestoreThread();	    /* enter python */
+#endif
+
+    PyRun_SimpleString((char *)(cmd));
+
+#ifdef PY_CAN_RECURSE
+    PyGILState_Release(pygilstate);
+#else
+    Python_SaveThread();	    /* leave python */
+#endif
+
+#if defined(HAVE_LOCALE_H) || defined(X_LOCALE)
+    if (saved_locale != NULL)
+    {
+	(void)setlocale(LC_NUMERIC, saved_locale);
+	vim_free(saved_locale);
+    }
+#endif
+
+    Python_Lock_Vim();		    /* enter vim */
+    PythonIO_Flush();
+#if defined(MACOS) && !defined(MACOS_X_UNIX)
+    SetPort(oldPort);
+#endif
+
+theend:
+#ifndef PY_CAN_RECURSE
+    --recursive;
+#endif
+    return;	    /* keeps lint happy */
+}
+
+/*
+ * ":python"
+ */
+    void
+ex_python(exarg_T *eap)
+{
+    char_u *script;
+
+    script = script_get(eap, eap->arg);
+    if (!eap->skip)
+    {
+	if (script == NULL)
+	    DoPythonCommand(eap, (char *)eap->arg);
+	else
+	    DoPythonCommand(eap, (char *)script);
+    }
+    vim_free(script);
+}
+
+#define BUFFER_SIZE 1024
+
+/*
+ * ":pyfile"
+ */
+    void
+ex_pyfile(exarg_T *eap)
+{
+    static char buffer[BUFFER_SIZE];
+    const char *file = (char *)eap->arg;
+    char *p;
+
+    /* Have to do it like this. PyRun_SimpleFile requires you to pass a
+     * stdio file pointer, but Vim and the Python DLL are compiled with
+     * different options under Windows, meaning that stdio pointers aren't
+     * compatible between the two. Yuk.
+     *
+     * Put the string "execfile('file')" into buffer. But, we need to
+     * escape any backslashes or single quotes in the file name, so that
+     * Python won't mangle the file name.
+     */
+    strcpy(buffer, "execfile('");
+    p = buffer + 10; /* size of "execfile('" */
+
+    while (*file && p < buffer + (BUFFER_SIZE - 3))
+    {
+	if (*file == '\\' || *file == '\'')
+	    *p++ = '\\';
+	*p++ = *file++;
+    }
+
+    /* If we didn't finish the file name, we hit a buffer overflow */
+    if (*file != '\0')
+	return;
+
+    /* Put in the terminating "')" and a null */
+    *p++ = '\'';
+    *p++ = ')';
+    *p++ = '\0';
+
+    /* Execute the file */
+    DoPythonCommand(eap, buffer);
+}
+
+/******************************************************
+ * 2. Python output stream: writes output via [e]msg().
+ */
+
+/* Implementation functions
+ */
+
+static PyObject *OutputGetattr(PyObject *, char *);
+static int OutputSetattr(PyObject *, char *, PyObject *);
+
+static PyObject *OutputWrite(PyObject *, PyObject *);
+static PyObject *OutputWritelines(PyObject *, PyObject *);
+
+typedef void (*writefn)(char_u *);
+static void writer(writefn fn, char_u *str, int n);
+
+/* Output object definition
+ */
+
+typedef struct
+{
+    PyObject_HEAD
+    long softspace;
+    long error;
+} OutputObject;
+
+static struct PyMethodDef OutputMethods[] = {
+    /* name,	    function,		calling,    documentation */
+    {"write",	    OutputWrite,	1,	    "" },
+    {"writelines",  OutputWritelines,	1,	    "" },
+    { NULL,	    NULL,		0,	    NULL }
+};
+
+static PyTypeObject OutputType = {
+	PyObject_HEAD_INIT(0)
+	0,
+	"message",
+	sizeof(OutputObject),
+	0,
+
+	(destructor) 0,
+	(printfunc) 0,
+	(getattrfunc) OutputGetattr,
+	(setattrfunc) OutputSetattr,
+	(cmpfunc) 0,
+	(reprfunc) 0,
+
+	0, /* as number */
+	0, /* as sequence */
+	0, /* as mapping */
+
+	(hashfunc) 0,
+	(ternaryfunc) 0,
+	(reprfunc) 0
+};
+
+/*************/
+
+    static PyObject *
+OutputGetattr(PyObject *self, char *name)
+{
+    if (strcmp(name, "softspace") == 0)
+	return PyInt_FromLong(((OutputObject *)(self))->softspace);
+
+    return Py_FindMethod(OutputMethods, self, name);
+}
+
+    static int
+OutputSetattr(PyObject *self, char *name, PyObject *val)
+{
+    if (val == NULL) {
+	PyErr_SetString(PyExc_AttributeError, _("can't delete OutputObject attributes"));
+	return -1;
+    }
+
+    if (strcmp(name, "softspace") == 0)
+    {
+	if (!PyInt_Check(val)) {
+	    PyErr_SetString(PyExc_TypeError, _("softspace must be an integer"));
+	    return -1;
+	}
+
+	((OutputObject *)(self))->softspace = PyInt_AsLong(val);
+	return 0;
+    }
+
+    PyErr_SetString(PyExc_AttributeError, _("invalid attribute"));
+    return -1;
+}
+
+/*************/
+
+    static PyObject *
+OutputWrite(PyObject *self, PyObject *args)
+{
+    int len;
+    char *str;
+    int error = ((OutputObject *)(self))->error;
+
+    if (!PyArg_ParseTuple(args, "s#", &str, &len))
+	return NULL;
+
+    Py_BEGIN_ALLOW_THREADS
+    Python_Lock_Vim();
+    writer((writefn)(error ? emsg : msg), (char_u *)str, len);
+    Python_Release_Vim();
+    Py_END_ALLOW_THREADS
+
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
+    static PyObject *
+OutputWritelines(PyObject *self, PyObject *args)
+{
+    int n;
+    int i;
+    PyObject *list;
+    int error = ((OutputObject *)(self))->error;
+
+    if (!PyArg_ParseTuple(args, "O", &list))
+	return NULL;
+    Py_INCREF(list);
+
+    if (!PyList_Check(list)) {
+	PyErr_SetString(PyExc_TypeError, _("writelines() requires list of strings"));
+	Py_DECREF(list);
+	return NULL;
+    }
+
+    n = PyList_Size(list);
+
+    for (i = 0; i < n; ++i)
+    {
+	PyObject *line = PyList_GetItem(list, i);
+	char *str;
+	int len;
+
+	if (!PyArg_Parse(line, "s#", &str, &len)) {
+	    PyErr_SetString(PyExc_TypeError, _("writelines() requires list of strings"));
+	    Py_DECREF(list);
+	    return NULL;
+	}
+
+	Py_BEGIN_ALLOW_THREADS
+	Python_Lock_Vim();
+	writer((writefn)(error ? emsg : msg), (char_u *)str, len);
+	Python_Release_Vim();
+	Py_END_ALLOW_THREADS
+    }
+
+    Py_DECREF(list);
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
+/* Output buffer management
+ */
+
+static char_u *buffer = NULL;
+static int buffer_len = 0;
+static int buffer_size = 0;
+
+static writefn old_fn = NULL;
+
+    static void
+buffer_ensure(int n)
+{
+    int new_size;
+    char_u *new_buffer;
+
+    if (n < buffer_size)
+	return;
+
+    new_size = buffer_size;
+    while (new_size < n)
+	new_size += 80;
+
+    if (new_size != buffer_size)
+    {
+	new_buffer = alloc((unsigned)new_size);
+	if (new_buffer == NULL)
+	    return;
+
+	if (buffer)
+	{
+	    memcpy(new_buffer, buffer, buffer_len);
+	    vim_free(buffer);
+	}
+
+	buffer = new_buffer;
+	buffer_size = new_size;
+    }
+}
+
+    static void
+PythonIO_Flush(void)
+{
+    if (old_fn && buffer_len)
+    {
+	buffer[buffer_len] = 0;
+	old_fn(buffer);
+    }
+
+    buffer_len = 0;
+}
+
+    static void
+writer(writefn fn, char_u *str, int n)
+{
+    char_u *ptr;
+
+    if (fn != old_fn && old_fn != NULL)
+	PythonIO_Flush();
+
+    old_fn = fn;
+
+    while (n > 0 && (ptr = memchr(str, '\n', n)) != NULL)
+    {
+	int len = ptr - str;
+
+	buffer_ensure(buffer_len + len + 1);
+
+	memcpy(buffer + buffer_len, str, len);
+	buffer_len += len;
+	buffer[buffer_len] = 0;
+	fn(buffer);
+	str = ptr + 1;
+	n -= len + 1;
+	buffer_len = 0;
+    }
+
+    /* Put the remaining text into the buffer for later printing */
+    buffer_ensure(buffer_len + n + 1);
+    memcpy(buffer + buffer_len, str, n);
+    buffer_len += n;
+}
+
+/***************/
+
+static OutputObject Output =
+{
+    PyObject_HEAD_INIT(&OutputType)
+    0,
+    0
+};
+
+static OutputObject Error =
+{
+    PyObject_HEAD_INIT(&OutputType)
+    0,
+    1
+};
+
+    static int
+PythonIO_Init(void)
+{
+    /* Fixups... */
+    OutputType.ob_type = &PyType_Type;
+
+    PySys_SetObject("stdout", (PyObject *)(&Output));
+    PySys_SetObject("stderr", (PyObject *)(&Error));
+
+    if (PyErr_Occurred())
+    {
+	EMSG(_("E264: Python: Error initialising I/O objects"));
+	return -1;
+    }
+
+    return 0;
+}
+
+/******************************************************
+ * 3. Implementation of the Vim module for Python
+ */
+
+/* Vim module - Implementation functions
+ * -------------------------------------
+ */
+
+static PyObject *VimError;
+
+static PyObject *VimCommand(PyObject *, PyObject *);
+static PyObject *VimEval(PyObject *, PyObject *);
+
+/* Window type - Implementation functions
+ * --------------------------------------
+ */
+
+typedef struct
+{
+    PyObject_HEAD
+    win_T	*win;
+}
+WindowObject;
+
+#define INVALID_WINDOW_VALUE ((win_T *)(-1))
+
+#define WindowType_Check(obj) ((obj)->ob_type == &WindowType)
+
+static PyObject *WindowNew(win_T *);
+
+static void WindowDestructor(PyObject *);
+static PyObject *WindowGetattr(PyObject *, char *);
+static int WindowSetattr(PyObject *, char *, PyObject *);
+static PyObject *WindowRepr(PyObject *);
+
+/* Buffer type - Implementation functions
+ * --------------------------------------
+ */
+
+typedef struct
+{
+    PyObject_HEAD
+    buf_T *buf;
+}
+BufferObject;
+
+#define INVALID_BUFFER_VALUE ((buf_T *)(-1))
+
+#define BufferType_Check(obj) ((obj)->ob_type == &BufferType)
+
+static PyObject *BufferNew (buf_T *);
+
+static void BufferDestructor(PyObject *);
+static PyObject *BufferGetattr(PyObject *, char *);
+static PyObject *BufferRepr(PyObject *);
+
+static int BufferLength(PyObject *);
+static PyObject *BufferItem(PyObject *, int);
+static PyObject *BufferSlice(PyObject *, int, int);
+static int BufferAssItem(PyObject *, int, PyObject *);
+static int BufferAssSlice(PyObject *, int, int, PyObject *);
+
+static PyObject *BufferAppend(PyObject *, PyObject *);
+static PyObject *BufferMark(PyObject *, PyObject *);
+static PyObject *BufferRange(PyObject *, PyObject *);
+
+/* Line range type - Implementation functions
+ * --------------------------------------
+ */
+
+typedef struct
+{
+    PyObject_HEAD
+    BufferObject *buf;
+    int start;
+    int end;
+}
+RangeObject;
+
+#define RangeType_Check(obj) ((obj)->ob_type == &RangeType)
+
+static PyObject *RangeNew(buf_T *, int, int);
+
+static void RangeDestructor(PyObject *);
+static PyObject *RangeGetattr(PyObject *, char *);
+static PyObject *RangeRepr(PyObject *);
+
+static int RangeLength(PyObject *);
+static PyObject *RangeItem(PyObject *, int);
+static PyObject *RangeSlice(PyObject *, int, int);
+static int RangeAssItem(PyObject *, int, PyObject *);
+static int RangeAssSlice(PyObject *, int, int, PyObject *);
+
+static PyObject *RangeAppend(PyObject *, PyObject *);
+
+/* Window list type - Implementation functions
+ * -------------------------------------------
+ */
+
+static int WinListLength(PyObject *);
+static PyObject *WinListItem(PyObject *, int);
+
+/* Buffer list type - Implementation functions
+ * -------------------------------------------
+ */
+
+static int BufListLength(PyObject *);
+static PyObject *BufListItem(PyObject *, int);
+
+/* Current objects type - Implementation functions
+ * -----------------------------------------------
+ */
+
+static PyObject *CurrentGetattr(PyObject *, char *);
+static int CurrentSetattr(PyObject *, char *, PyObject *);
+
+/* Vim module - Definitions
+ */
+
+static struct PyMethodDef VimMethods[] = {
+    /* name,	     function,		calling,    documentation */
+    {"command",	     VimCommand,	1,	    "" },
+    {"eval",	     VimEval,		1,	    "" },
+    { NULL,	     NULL,		0,	    NULL }
+};
+
+/* Vim module - Implementation
+ */
+/*ARGSUSED*/
+    static PyObject *
+VimCommand(PyObject *self, PyObject *args)
+{
+    char *cmd;
+    PyObject *result;
+
+    if (!PyArg_ParseTuple(args, "s", &cmd))
+	return NULL;
+
+    PyErr_Clear();
+
+    Py_BEGIN_ALLOW_THREADS
+    Python_Lock_Vim();
+
+    do_cmdline_cmd((char_u *)cmd);
+    update_screen(VALID);
+
+    Python_Release_Vim();
+    Py_END_ALLOW_THREADS
+
+    if (VimErrorCheck())
+	result = NULL;
+    else
+	result = Py_None;
+
+    Py_XINCREF(result);
+    return result;
+}
+
+/*ARGSUSED*/
+    static PyObject *
+VimEval(PyObject *self, PyObject *args)
+{
+#ifdef FEAT_EVAL
+    char	*expr;
+    char	*str;
+    PyObject	*result;
+
+    if (!PyArg_ParseTuple(args, "s", &expr))
+	return NULL;
+
+    Py_BEGIN_ALLOW_THREADS
+    Python_Lock_Vim();
+    str = (char *)eval_to_string((char_u *)expr, NULL);
+    Python_Release_Vim();
+    Py_END_ALLOW_THREADS
+
+    if (str == NULL)
+    {
+	PyErr_SetVim(_("invalid expression"));
+	return NULL;
+    }
+
+    result = Py_BuildValue("s", str);
+
+    Py_BEGIN_ALLOW_THREADS
+    Python_Lock_Vim();
+    vim_free(str);
+    Python_Release_Vim();
+    Py_END_ALLOW_THREADS
+
+    return result;
+#else
+    PyErr_SetVim(_("expressions disabled at compile time"));
+    return NULL;
+#endif
+}
+
+/* Common routines for buffers and line ranges
+ * -------------------------------------------
+ */
+    static int
+CheckBuffer(BufferObject *this)
+{
+    if (this->buf == INVALID_BUFFER_VALUE)
+    {
+	PyErr_SetVim(_("attempt to refer to deleted buffer"));
+	return -1;
+    }
+
+    return 0;
+}
+
+    static PyObject *
+RBItem(BufferObject *self, int n, int start, int end)
+{
+    if (CheckBuffer(self))
+	return NULL;
+
+    if (n < 0 || n > end - start)
+    {
+	PyErr_SetString(PyExc_IndexError, _("line number out of range"));
+	return NULL;
+    }
+
+    return GetBufferLine(self->buf, n+start);
+}
+
+    static PyObject *
+RBSlice(BufferObject *self, int lo, int hi, int start, int end)
+{
+    int size;
+
+    if (CheckBuffer(self))
+	return NULL;
+
+    size = end - start + 1;
+
+    if (lo < 0)
+	lo = 0;
+    else if (lo > size)
+	lo = size;
+    if (hi < 0)
+	hi = 0;
+    if (hi < lo)
+	hi = lo;
+    else if (hi > size)
+	hi = size;
+
+    return GetBufferLineList(self->buf, lo+start, hi+start);
+}
+
+    static int
+RBAssItem(BufferObject *self, int n, PyObject *val, int start, int end, int *new_end)
+{
+    int len_change;
+
+    if (CheckBuffer(self))
+	return -1;
+
+    if (n < 0 || n > end - start)
+    {
+	PyErr_SetString(PyExc_IndexError, _("line number out of range"));
+	return -1;
+    }
+
+    if (SetBufferLine(self->buf, n+start, val, &len_change) == FAIL)
+	return -1;
+
+    if (new_end)
+	*new_end = end + len_change;
+
+    return 0;
+}
+
+    static int
+RBAssSlice(BufferObject *self, int lo, int hi, PyObject *val, int start, int end, int *new_end)
+{
+    int size;
+    int len_change;
+
+    /* Self must be a valid buffer */
+    if (CheckBuffer(self))
+	return -1;
+
+    /* Sort out the slice range */
+    size = end - start + 1;
+
+    if (lo < 0)
+	lo = 0;
+    else if (lo > size)
+	lo = size;
+    if (hi < 0)
+	hi = 0;
+    if (hi < lo)
+	hi = lo;
+    else if (hi > size)
+	hi = size;
+
+    if (SetBufferLineList(self->buf, lo+start, hi+start, val, &len_change) == FAIL)
+	return -1;
+
+    if (new_end)
+	*new_end = end + len_change;
+
+    return 0;
+}
+
+    static PyObject *
+RBAppend(BufferObject *self, PyObject *args, int start, int end, int *new_end)
+{
+    PyObject *lines;
+    int len_change;
+    int max;
+    int n;
+
+    if (CheckBuffer(self))
+	return NULL;
+
+    max = n = end - start + 1;
+
+    if (!PyArg_ParseTuple(args, "O|i", &lines, &n))
+	return NULL;
+
+    if (n < 0 || n > max)
+    {
+	PyErr_SetString(PyExc_ValueError, _("line number out of range"));
+	return NULL;
+    }
+
+    if (InsertBufferLines(self->buf, n + start - 1, lines, &len_change) == FAIL)
+	return NULL;
+
+    if (new_end)
+	*new_end = end + len_change;
+
+    Py_INCREF(Py_None);
+    return Py_None;
+}
+
+
+/* Buffer object - Definitions
+ */
+
+static struct PyMethodDef BufferMethods[] = {
+    /* name,	    function,		calling,    documentation */
+    {"append",	    BufferAppend,	1,	    "" },
+    {"mark",	    BufferMark,		1,	    "" },
+    {"range",	    BufferRange,	1,	    "" },
+    { NULL,	    NULL,		0,	    NULL }
+};
+
+static PySequenceMethods BufferAsSeq = {
+    (inquiry)		BufferLength,	    /* sq_length,    len(x)   */
+    (binaryfunc)	0, /* BufferConcat, */	     /* sq_concat,    x+y      */
+    (intargfunc)	0, /* BufferRepeat, */	     /* sq_repeat,    x*n      */
+    (intargfunc)	BufferItem,	    /* sq_item,      x[i]     */
+    (intintargfunc)	BufferSlice,	    /* sq_slice,     x[i:j]   */
+    (intobjargproc)	BufferAssItem,	    /* sq_ass_item,  x[i]=v   */
+    (intintobjargproc)	BufferAssSlice,     /* sq_ass_slice, x[i:j]=v */
+};
+
+static PyTypeObject BufferType = {
+    PyObject_HEAD_INIT(0)
+    0,
+    "buffer",
+    sizeof(BufferObject),
+    0,
+
+    (destructor)    BufferDestructor,	/* tp_dealloc,	refcount==0  */
+    (printfunc)     0,			/* tp_print,	print x      */
+    (getattrfunc)   BufferGetattr,	/* tp_getattr,	x.attr	     */
+    (setattrfunc)   0,			/* tp_setattr,	x.attr=v     */
+    (cmpfunc)	    0,			/* tp_compare,	x>y	     */
+    (reprfunc)	    BufferRepr,		/* tp_repr,	`x`, print x */
+
+    0,		    /* as number */
+    &BufferAsSeq,   /* as sequence */
+    0,		    /* as mapping */
+
+    (hashfunc) 0,			/* tp_hash, dict(x) */
+    (ternaryfunc) 0,			/* tp_call, x()     */
+    (reprfunc) 0,			/* tp_str,  str(x)  */
+};
+
+/* Buffer object - Implementation
+ */
+
+    static PyObject *
+BufferNew(buf_T *buf)
+{
+    /* We need to handle deletion of buffers underneath us.
+     * If we add a "python_ref" field to the buf_T structure,
+     * then we can get at it in buf_freeall() in vim. We then
+     * need to create only ONE Python object per buffer - if
+     * we try to create a second, just INCREF the existing one
+     * and return it. The (single) Python object referring to
+     * the buffer is stored in "python_ref".
+     * Question: what to do on a buf_freeall(). We'll probably
+     * have to either delete the Python object (DECREF it to
+     * zero - a bad idea, as it leaves dangling refs!) or
+     * set the buf_T * value to an invalid value (-1?), which
+     * means we need checks in all access functions... Bah.
+     */
+
+    BufferObject *self;
+
+    if (buf->python_ref)
+    {
+	self = buf->python_ref;
+	Py_INCREF(self);
+    }
+    else
+    {
+	self = PyObject_NEW(BufferObject, &BufferType);
+	if (self == NULL)
+	    return NULL;
+	self->buf = buf;
+	buf->python_ref = self;
+    }
+
+    return (PyObject *)(self);
+}
+
+    static void
+BufferDestructor(PyObject *self)
+{
+    BufferObject *this = (BufferObject *)(self);
+
+    if (this->buf && this->buf != INVALID_BUFFER_VALUE)
+	this->buf->python_ref = NULL;
+
+    PyMem_DEL(self);
+}
+
+    static PyObject *
+BufferGetattr(PyObject *self, char *name)
+{
+    BufferObject *this = (BufferObject *)(self);
+
+    if (CheckBuffer(this))
+	return NULL;
+
+    if (strcmp(name, "name") == 0)
+	return Py_BuildValue("s",this->buf->b_ffname);
+    else if (strcmp(name, "number") == 0)
+	return Py_BuildValue("i",this->buf->b_fnum);
+    else if (strcmp(name,"__members__") == 0)
+	return Py_BuildValue("[ss]", "name", "number");
+    else
+	return Py_FindMethod(BufferMethods, self, name);
+}
+
+    static PyObject *
+BufferRepr(PyObject *self)
+{
+    static char repr[50];
+    BufferObject *this = (BufferObject *)(self);
+
+    if (this->buf == INVALID_BUFFER_VALUE)
+    {
+	sprintf(repr, _("<buffer object (deleted) at %8lX>"), (long)(self));
+	return PyString_FromString(repr);
+    }
+    else
+    {
+	char *name = (char *)this->buf->b_fname;
+	int len;
+
+	if (name == NULL)
+	    name = "";
+	len = strlen(name);
+
+	if (len > 35)
+	    name = name + (35 - len);
+
+	sprintf(repr, "<buffer %s%s>", len > 35 ? "..." : "", name);
+
+	return PyString_FromString(repr);
+    }
+}
+
+/******************/
+
+    static int
+BufferLength(PyObject *self)
+{
+    /* HOW DO WE SIGNAL AN ERROR FROM THIS FUNCTION? */
+    if (CheckBuffer((BufferObject *)(self)))
+	return -1; /* ??? */
+
+    return (((BufferObject *)(self))->buf->b_ml.ml_line_count);
+}
+
+    static PyObject *
+BufferItem(PyObject *self, int n)
+{
+    return RBItem((BufferObject *)(self), n, 1,
+		  (int)((BufferObject *)(self))->buf->b_ml.ml_line_count);
+}
+
+    static PyObject *
+BufferSlice(PyObject *self, int lo, int hi)
+{
+    return RBSlice((BufferObject *)(self), lo, hi, 1,
+		   (int)((BufferObject *)(self))->buf->b_ml.ml_line_count);
+}
+
+    static int
+BufferAssItem(PyObject *self, int n, PyObject *val)
+{
+    return RBAssItem((BufferObject *)(self), n, val, 1,
+		     (int)((BufferObject *)(self))->buf->b_ml.ml_line_count,
+		     NULL);
+}
+
+    static int
+BufferAssSlice(PyObject *self, int lo, int hi, PyObject *val)
+{
+    return RBAssSlice((BufferObject *)(self), lo, hi, val, 1,
+		      (int)((BufferObject *)(self))->buf->b_ml.ml_line_count,
+		      NULL);
+}
+
+    static PyObject *
+BufferAppend(PyObject *self, PyObject *args)
+{
+    return RBAppend((BufferObject *)(self), args, 1,
+		    (int)((BufferObject *)(self))->buf->b_ml.ml_line_count,
+		    NULL);
+}
+
+    static PyObject *
+BufferMark(PyObject *self, PyObject *args)
+{
+    pos_T	*posp;
+    char	mark;
+    buf_T	*curbuf_save;
+
+    if (CheckBuffer((BufferObject *)(self)))
+	return NULL;
+
+    if (!PyArg_ParseTuple(args, "c", &mark))
+	return NULL;
+
+    curbuf_save = curbuf;
+    curbuf = ((BufferObject *)(self))->buf;
+    posp = getmark(mark, FALSE);
+    curbuf = curbuf_save;
+
+    if (posp == NULL)
+    {
+	PyErr_SetVim(_("invalid mark name"));
+	return NULL;
+    }
+
+    /* Ckeck for keyboard interrupt */
+    if (VimErrorCheck())
+	return NULL;
+
+    if (posp->lnum <= 0)
+    {
+	/* Or raise an error? */
+	Py_INCREF(Py_None);
+	return Py_None;
+    }
+
+    return Py_BuildValue("(ll)", (long)(posp->lnum), (long)(posp->col));
+}
+
+    static PyObject *
+BufferRange(PyObject *self, PyObject *args)
+{
+    int start;
+    int end;
+
+    if (CheckBuffer((BufferObject *)(self)))
+	return NULL;
+
+    if (!PyArg_ParseTuple(args, "ii", &start, &end))
+	return NULL;
+
+    return RangeNew(((BufferObject *)(self))->buf, start, end);
+}
+
+/* Line range object - Definitions
+ */
+
+static struct PyMethodDef RangeMethods[] = {
+    /* name,	    function,		calling,    documentation */
+    {"append",	    RangeAppend,	1,	    "" },
+    { NULL,	    NULL,		0,	    NULL }
+};
+
+static PySequenceMethods RangeAsSeq = {
+    (inquiry)		RangeLength,	    /* sq_length,    len(x)   */
+    (binaryfunc)	0, /* RangeConcat, */	     /* sq_concat,    x+y      */
+    (intargfunc)	0, /* RangeRepeat, */	     /* sq_repeat,    x*n      */
+    (intargfunc)	RangeItem,	    /* sq_item,      x[i]     */
+    (intintargfunc)	RangeSlice,	    /* sq_slice,     x[i:j]   */
+    (intobjargproc)	RangeAssItem,	    /* sq_ass_item,  x[i]=v   */
+    (intintobjargproc)	RangeAssSlice,	    /* sq_ass_slice, x[i:j]=v */
+};
+
+static PyTypeObject RangeType = {
+    PyObject_HEAD_INIT(0)
+    0,
+    "range",
+    sizeof(RangeObject),
+    0,
+
+    (destructor)    RangeDestructor,	/* tp_dealloc,	refcount==0  */
+    (printfunc)     0,			/* tp_print,	print x      */
+    (getattrfunc)   RangeGetattr,	/* tp_getattr,	x.attr	     */
+    (setattrfunc)   0,			/* tp_setattr,	x.attr=v     */
+    (cmpfunc)	    0,			/* tp_compare,	x>y	     */
+    (reprfunc)	    RangeRepr,		/* tp_repr,	`x`, print x */
+
+    0,		    /* as number */
+    &RangeAsSeq,    /* as sequence */
+    0,		    /* as mapping */
+
+    (hashfunc) 0,			/* tp_hash, dict(x) */
+    (ternaryfunc) 0,			/* tp_call, x()     */
+    (reprfunc) 0,			/* tp_str,  str(x)  */
+};
+
+/* Line range object - Implementation
+ */
+
+    static PyObject *
+RangeNew(buf_T *buf, int start, int end)
+{
+    BufferObject *bufr;
+    RangeObject *self;
+    self = PyObject_NEW(RangeObject, &RangeType);
+    if (self == NULL)
+	return NULL;
+
+    bufr = (BufferObject *)BufferNew(buf);
+    if (bufr == NULL)
+    {
+	PyMem_DEL(self);
+	return NULL;
+    }
+    Py_INCREF(bufr);
+
+    self->buf = bufr;
+    self->start = start;
+    self->end = end;
+
+    return (PyObject *)(self);
+}
+
+    static void
+RangeDestructor(PyObject *self)
+{
+    Py_DECREF(((RangeObject *)(self))->buf);
+    PyMem_DEL(self);
+}
+
+    static PyObject *
+RangeGetattr(PyObject *self, char *name)
+{
+    if (strcmp(name, "start") == 0)
+	return Py_BuildValue("i",((RangeObject *)(self))->start - 1);
+    else if (strcmp(name, "end") == 0)
+	return Py_BuildValue("i",((RangeObject *)(self))->end - 1);
+    else
+	return Py_FindMethod(RangeMethods, self, name);
+}
+
+    static PyObject *
+RangeRepr(PyObject *self)
+{
+    static char repr[75];
+    RangeObject *this = (RangeObject *)(self);
+
+    if (this->buf->buf == INVALID_BUFFER_VALUE)
+    {
+	sprintf(repr, "<range object (for deleted buffer) at %8lX>",
+								(long)(self));
+	return PyString_FromString(repr);
+    }
+    else
+    {
+	char *name = (char *)this->buf->buf->b_fname;
+	int len;
+
+	if (name == NULL)
+	    name = "";
+	len = strlen(name);
+
+	if (len > 45)
+	    name = name + (45 - len);
+
+	sprintf(repr, "<range %s%s (%d:%d)>",
+		len > 45 ? "..." : "", name,
+		this->start, this->end);
+
+	return PyString_FromString(repr);
+    }
+}
+
+/****************/
+
+    static int
+RangeLength(PyObject *self)
+{
+    /* HOW DO WE SIGNAL AN ERROR FROM THIS FUNCTION? */
+    if (CheckBuffer(((RangeObject *)(self))->buf))
+	return -1; /* ??? */
+
+    return (((RangeObject *)(self))->end - ((RangeObject *)(self))->start + 1);
+}
+
+    static PyObject *
+RangeItem(PyObject *self, int n)
+{
+    return RBItem(((RangeObject *)(self))->buf, n,
+		  ((RangeObject *)(self))->start,
+		  ((RangeObject *)(self))->end);
+}
+
+    static PyObject *
+RangeSlice(PyObject *self, int lo, int hi)
+{
+    return RBSlice(((RangeObject *)(self))->buf, lo, hi,
+		   ((RangeObject *)(self))->start,
+		   ((RangeObject *)(self))->end);
+}
+
+    static int
+RangeAssItem(PyObject *self, int n, PyObject *val)
+{
+    return RBAssItem(((RangeObject *)(self))->buf, n, val,
+		     ((RangeObject *)(self))->start,
+		     ((RangeObject *)(self))->end,
+		     &((RangeObject *)(self))->end);
+}
+
+    static int
+RangeAssSlice(PyObject *self, int lo, int hi, PyObject *val)
+{
+    return RBAssSlice(((RangeObject *)(self))->buf, lo, hi, val,
+		      ((RangeObject *)(self))->start,
+		      ((RangeObject *)(self))->end,
+		      &((RangeObject *)(self))->end);
+}
+
+    static PyObject *
+RangeAppend(PyObject *self, PyObject *args)
+{
+    return RBAppend(((RangeObject *)(self))->buf, args,
+		    ((RangeObject *)(self))->start,
+		    ((RangeObject *)(self))->end,
+		    &((RangeObject *)(self))->end);
+}
+
+/* Buffer list object - Definitions
+ */
+
+typedef struct
+{
+    PyObject_HEAD
+}
+BufListObject;
+
+static PySequenceMethods BufListAsSeq = {
+    (inquiry)		BufListLength,	    /* sq_length,    len(x)   */
+    (binaryfunc)	0,		    /* sq_concat,    x+y      */
+    (intargfunc)	0,		    /* sq_repeat,    x*n      */
+    (intargfunc)	BufListItem,	    /* sq_item,      x[i]     */
+    (intintargfunc)	0,		    /* sq_slice,     x[i:j]   */
+    (intobjargproc)	0,		    /* sq_ass_item,  x[i]=v   */
+    (intintobjargproc)	0,		    /* sq_ass_slice, x[i:j]=v */
+};
+
+static PyTypeObject BufListType = {
+    PyObject_HEAD_INIT(0)
+    0,
+    "buffer list",
+    sizeof(BufListObject),
+    0,
+
+    (destructor)    0,			/* tp_dealloc,	refcount==0  */
+    (printfunc)     0,			/* tp_print,	print x      */
+    (getattrfunc)   0,			/* tp_getattr,	x.attr	     */
+    (setattrfunc)   0,			/* tp_setattr,	x.attr=v     */
+    (cmpfunc)	    0,			/* tp_compare,	x>y	     */
+    (reprfunc)	    0,			/* tp_repr,	`x`, print x */
+
+    0,		    /* as number */
+    &BufListAsSeq,  /* as sequence */
+    0,		    /* as mapping */
+
+    (hashfunc) 0,			/* tp_hash, dict(x) */
+    (ternaryfunc) 0,			/* tp_call, x()     */
+    (reprfunc) 0,			/* tp_str,  str(x)  */
+};
+
+/* Buffer list object - Implementation
+ */
+
+/*ARGSUSED*/
+    static int
+BufListLength(PyObject *self)
+{
+    buf_T	*b = firstbuf;
+    int		n = 0;
+
+    while (b)
+    {
+	++n;
+	b = b->b_next;
+    }
+
+    return n;
+}
+
+/*ARGSUSED*/
+    static PyObject *
+BufListItem(PyObject *self, int n)
+{
+    buf_T *b;
+
+    for (b = firstbuf; b; b = b->b_next, --n)
+    {
+	if (n == 0)
+	    return BufferNew(b);
+    }
+
+    PyErr_SetString(PyExc_IndexError, _("no such buffer"));
+    return NULL;
+}
+
+/* Window object - Definitions
+ */
+
+static struct PyMethodDef WindowMethods[] = {
+    /* name,	    function,		calling,    documentation */
+    { NULL,	    NULL,		0,	    NULL }
+};
+
+static PyTypeObject WindowType = {
+    PyObject_HEAD_INIT(0)
+    0,
+    "window",
+    sizeof(WindowObject),
+    0,
+
+    (destructor)    WindowDestructor,	/* tp_dealloc,	refcount==0  */
+    (printfunc)     0,			/* tp_print,	print x      */
+    (getattrfunc)   WindowGetattr,	/* tp_getattr,	x.attr	     */
+    (setattrfunc)   WindowSetattr,	/* tp_setattr,	x.attr=v     */
+    (cmpfunc)	    0,			/* tp_compare,	x>y	     */
+    (reprfunc)	    WindowRepr,		/* tp_repr,	`x`, print x */
+
+    0,		    /* as number */
+    0,		    /* as sequence */
+    0,		    /* as mapping */
+
+    (hashfunc) 0,			/* tp_hash, dict(x) */
+    (ternaryfunc) 0,			/* tp_call, x()     */
+    (reprfunc) 0,			/* tp_str,  str(x)  */
+};
+
+/* Window object - Implementation
+ */
+
+    static PyObject *
+WindowNew(win_T *win)
+{
+    /* We need to handle deletion of windows underneath us.
+     * If we add a "python_ref" field to the win_T structure,
+     * then we can get at it in win_free() in vim. We then
+     * need to create only ONE Python object per window - if
+     * we try to create a second, just INCREF the existing one
+     * and return it. The (single) Python object referring to
+     * the window is stored in "python_ref".
+     * On a win_free() we set the Python object's win_T* field
+     * to an invalid value. We trap all uses of a window
+     * object, and reject them if the win_T* field is invalid.
+     */
+
+    WindowObject *self;
+
+    if (win->python_ref)
+    {
+	self = win->python_ref;
+	Py_INCREF(self);
+    }
+    else
+    {
+	self = PyObject_NEW(WindowObject, &WindowType);
+	if (self == NULL)
+	    return NULL;
+	self->win = win;
+	win->python_ref = self;
+    }
+
+    return (PyObject *)(self);
+}
+
+    static void
+WindowDestructor(PyObject *self)
+{
+    WindowObject *this = (WindowObject *)(self);
+
+    if (this->win && this->win != INVALID_WINDOW_VALUE)
+	this->win->python_ref = NULL;
+
+    PyMem_DEL(self);
+}
+
+    static int
+CheckWindow(WindowObject *this)
+{
+    if (this->win == INVALID_WINDOW_VALUE)
+    {
+	PyErr_SetVim(_("attempt to refer to deleted window"));
+	return -1;
+    }
+
+    return 0;
+}
+
+    static PyObject *
+WindowGetattr(PyObject *self, char *name)
+{
+    WindowObject *this = (WindowObject *)(self);
+
+    if (CheckWindow(this))
+	return NULL;
+
+    if (strcmp(name, "buffer") == 0)
+	return (PyObject *)BufferNew(this->win->w_buffer);
+    else if (strcmp(name, "cursor") == 0)
+    {
+	pos_T *pos = &this->win->w_cursor;
+
+	return Py_BuildValue("(ll)", (long)(pos->lnum), (long)(pos->col));
+    }
+    else if (strcmp(name, "height") == 0)
+	return Py_BuildValue("l", (long)(this->win->w_height));
+#ifdef FEAT_VERTSPLIT
+    else if (strcmp(name, "width") == 0)
+	return Py_BuildValue("l", (long)(W_WIDTH(this->win)));
+#endif
+    else if (strcmp(name,"__members__") == 0)
+	return Py_BuildValue("[sss]", "buffer", "cursor", "height");
+    else
+	return Py_FindMethod(WindowMethods, self, name);
+}
+
+    static int
+WindowSetattr(PyObject *self, char *name, PyObject *val)
+{
+    WindowObject *this = (WindowObject *)(self);
+
+    if (CheckWindow(this))
+	return -1;
+
+    if (strcmp(name, "buffer") == 0)
+    {
+	PyErr_SetString(PyExc_TypeError, _("readonly attribute"));
+	return -1;
+    }
+    else if (strcmp(name, "cursor") == 0)
+    {
+	long lnum;
+	long col;
+
+	if (!PyArg_Parse(val, "(ll)", &lnum, &col))
+	    return -1;
+
+	if (lnum <= 0 || lnum > this->win->w_buffer->b_ml.ml_line_count)
+	{
+	    PyErr_SetVim(_("cursor position outside buffer"));
+	    return -1;
+	}
+
+	/* Check for keyboard interrupts */
+	if (VimErrorCheck())
+	    return -1;
+
+	/* NO CHECK ON COLUMN - SEEMS NOT TO MATTER */
+
+	this->win->w_cursor.lnum = lnum;
+	this->win->w_cursor.col = col;
+	update_screen(VALID);
+
+	return 0;
+    }
+    else if (strcmp(name, "height") == 0)
+    {
+	int	height;
+	win_T	*savewin;
+
+	if (!PyArg_Parse(val, "i", &height))
+	    return -1;
+
+#ifdef FEAT_GUI
+	need_mouse_correct = TRUE;
+#endif
+	savewin = curwin;
+	curwin = this->win;
+	win_setheight(height);
+	curwin = savewin;
+
+	/* Check for keyboard interrupts */
+	if (VimErrorCheck())
+	    return -1;
+
+	return 0;
+    }
+#ifdef FEAT_VERTSPLIT
+    else if (strcmp(name, "width") == 0)
+    {
+	int	width;
+	win_T	*savewin;
+
+	if (!PyArg_Parse(val, "i", &width))
+	    return -1;
+
+#ifdef FEAT_GUI
+	need_mouse_correct = TRUE;
+#endif
+	savewin = curwin;
+	curwin = this->win;
+	win_setwidth(width);
+	curwin = savewin;
+
+	/* Check for keyboard interrupts */
+	if (VimErrorCheck())
+	    return -1;
+
+	return 0;
+    }
+#endif
+    else
+    {
+	PyErr_SetString(PyExc_AttributeError, name);
+	return -1;
+    }
+}
+
+    static PyObject *
+WindowRepr(PyObject *self)
+{
+    static char repr[50];
+    WindowObject *this = (WindowObject *)(self);
+
+    if (this->win == INVALID_WINDOW_VALUE)
+    {
+	sprintf(repr, _("<window object (deleted) at %.8lX>"), (long)(self));
+	return PyString_FromString(repr);
+    }
+    else
+    {
+	int	i = 0;
+	win_T	*w;
+
+	for (w = firstwin; w != NULL && w != this->win; w = W_NEXT(w))
+	    ++i;
+
+	if (w == NULL)
+	    sprintf(repr, _("<window object (unknown) at %.8lX>"), (long)(self));
+	else
+	    sprintf(repr, _("<window %d>"), i);
+
+	return PyString_FromString(repr);
+    }
+}
+
+/* Window list object - Definitions
+ */
+
+typedef struct
+{
+    PyObject_HEAD
+}
+WinListObject;
+
+static PySequenceMethods WinListAsSeq = {
+    (inquiry)		WinListLength,	    /* sq_length,    len(x)   */
+    (binaryfunc)	0,		    /* sq_concat,    x+y      */
+    (intargfunc)	0,		    /* sq_repeat,    x*n      */
+    (intargfunc)	WinListItem,	    /* sq_item,      x[i]     */
+    (intintargfunc)	0,		    /* sq_slice,     x[i:j]   */
+    (intobjargproc)	0,		    /* sq_ass_item,  x[i]=v   */
+    (intintobjargproc)	0,		    /* sq_ass_slice, x[i:j]=v */
+};
+
+static PyTypeObject WinListType = {
+    PyObject_HEAD_INIT(0)
+    0,
+    "window list",
+    sizeof(WinListObject),
+    0,
+
+    (destructor)    0,			/* tp_dealloc,	refcount==0  */
+    (printfunc)     0,			/* tp_print,	print x      */
+    (getattrfunc)   0,			/* tp_getattr,	x.attr	     */
+    (setattrfunc)   0,			/* tp_setattr,	x.attr=v     */
+    (cmpfunc)	    0,			/* tp_compare,	x>y	     */
+    (reprfunc)	    0,			/* tp_repr,	`x`, print x */
+
+    0,		    /* as number */
+    &WinListAsSeq,  /* as sequence */
+    0,		    /* as mapping */
+
+    (hashfunc) 0,			/* tp_hash, dict(x) */
+    (ternaryfunc) 0,			/* tp_call, x()     */
+    (reprfunc) 0,			/* tp_str,  str(x)  */
+};
+
+/* Window list object - Implementation
+ */
+/*ARGSUSED*/
+    static int
+WinListLength(PyObject *self)
+{
+    win_T	*w = firstwin;
+    int		n = 0;
+
+    while (w)
+    {
+	++n;
+	w = W_NEXT(w);
+    }
+
+    return n;
+}
+
+/*ARGSUSED*/
+    static PyObject *
+WinListItem(PyObject *self, int n)
+{
+    win_T *w;
+
+    for (w = firstwin; w; w = W_NEXT(w), --n)
+	if (n == 0)
+	    return WindowNew(w);
+
+    PyErr_SetString(PyExc_IndexError, _("no such window"));
+    return NULL;
+}
+
+/* Current items object - Definitions
+ */
+
+typedef struct
+{
+    PyObject_HEAD
+}
+CurrentObject;
+
+static PyTypeObject CurrentType = {
+    PyObject_HEAD_INIT(0)
+    0,
+    "current data",
+    sizeof(CurrentObject),
+    0,
+
+    (destructor)    0,			/* tp_dealloc,	refcount==0  */
+    (printfunc)     0,			/* tp_print,	print x      */
+    (getattrfunc)   CurrentGetattr,	/* tp_getattr,	x.attr	     */
+    (setattrfunc)   CurrentSetattr,	/* tp_setattr,	x.attr=v     */
+    (cmpfunc)	    0,			/* tp_compare,	x>y	     */
+    (reprfunc)	    0,			/* tp_repr,	`x`, print x */
+
+    0,		    /* as number */
+    0,		    /* as sequence */
+    0,		    /* as mapping */
+
+    (hashfunc) 0,			/* tp_hash, dict(x) */
+    (ternaryfunc) 0,			/* tp_call, x()     */
+    (reprfunc) 0,			/* tp_str,  str(x)  */
+};
+
+/* Current items object - Implementation
+ */
+/*ARGSUSED*/
+    static PyObject *
+CurrentGetattr(PyObject *self, char *name)
+{
+    if (strcmp(name, "buffer") == 0)
+	return (PyObject *)BufferNew(curbuf);
+    else if (strcmp(name, "window") == 0)
+	return (PyObject *)WindowNew(curwin);
+    else if (strcmp(name, "line") == 0)
+	return GetBufferLine(curbuf, (int)curwin->w_cursor.lnum);
+    else if (strcmp(name, "range") == 0)
+	return RangeNew(curbuf, RangeStart, RangeEnd);
+    else if (strcmp(name,"__members__") == 0)
+	return Py_BuildValue("[ssss]", "buffer", "window", "line", "range");
+    else
+    {
+	PyErr_SetString(PyExc_AttributeError, name);
+	return NULL;
+    }
+}
+
+/*ARGSUSED*/
+    static int
+CurrentSetattr(PyObject *self, char *name, PyObject *value)
+{
+    if (strcmp(name, "line") == 0)
+    {
+	if (SetBufferLine(curbuf, (int)curwin->w_cursor.lnum, value, NULL) == FAIL)
+	    return -1;
+
+	return 0;
+    }
+    else
+    {
+	PyErr_SetString(PyExc_AttributeError, name);
+	return -1;
+    }
+}
+
+/* External interface
+ */
+
+    void
+python_buffer_free(buf_T *buf)
+{
+    if (buf->python_ref)
+    {
+	BufferObject *bp = buf->python_ref;
+	bp->buf = INVALID_BUFFER_VALUE;
+	buf->python_ref = NULL;
+    }
+}
+
+#if defined(FEAT_WINDOWS) || defined(PROTO)
+    void
+python_window_free(win_T *win)
+{
+    if (win->python_ref)
+    {
+	WindowObject *wp = win->python_ref;
+	wp->win = INVALID_WINDOW_VALUE;
+	win->python_ref = NULL;
+    }
+}
+#endif
+
+static BufListObject TheBufferList =
+{
+    PyObject_HEAD_INIT(&BufListType)
+};
+
+static WinListObject TheWindowList =
+{
+    PyObject_HEAD_INIT(&WinListType)
+};
+
+static CurrentObject TheCurrent =
+{
+    PyObject_HEAD_INIT(&CurrentType)
+};
+
+    static int
+PythonMod_Init(void)
+{
+    PyObject *mod;
+    PyObject *dict;
+    static char *(argv[2]) = {"", NULL};
+
+    /* Fixups... */
+    BufferType.ob_type = &PyType_Type;
+    RangeType.ob_type = &PyType_Type;
+    WindowType.ob_type = &PyType_Type;
+    BufListType.ob_type = &PyType_Type;
+    WinListType.ob_type = &PyType_Type;
+    CurrentType.ob_type = &PyType_Type;
+
+    /* Set sys.argv[] to avoid a crash in warn(). */
+    PySys_SetArgv(1, argv);
+
+    mod = Py_InitModule("vim", VimMethods);
+    dict = PyModule_GetDict(mod);
+
+    VimError = Py_BuildValue("s", "vim.error");
+
+    PyDict_SetItemString(dict, "error", VimError);
+    PyDict_SetItemString(dict, "buffers", (PyObject *)(&TheBufferList));
+    PyDict_SetItemString(dict, "current", (PyObject *)(&TheCurrent));
+    PyDict_SetItemString(dict, "windows", (PyObject *)(&TheWindowList));
+
+    if (PyErr_Occurred())
+	return -1;
+
+    return 0;
+}
+
+/*************************************************************************
+ * 4. Utility functions for handling the interface between Vim and Python.
+ */
+
+/* Get a line from the specified buffer. The line number is
+ * in Vim format (1-based). The line is returned as a Python
+ * string object.
+ */
+    static PyObject *
+GetBufferLine(buf_T *buf, int n)
+{
+    return LineToString((char *)ml_get_buf(buf, (linenr_T)n, FALSE));
+}
+
+/* Get a list of lines from the specified buffer. The line numbers
+ * are in Vim format (1-based). The range is from lo up to, but not
+ * including, hi. The list is returned as a Python list of string objects.
+ */
+    static PyObject *
+GetBufferLineList(buf_T *buf, int lo, int hi)
+{
+    int i;
+    int n = hi - lo;
+    PyObject *list = PyList_New(n);
+
+    if (list == NULL)
+	return NULL;
+
+    for (i = 0; i < n; ++i)
+    {
+	PyObject *str = LineToString((char *)ml_get_buf(buf, (linenr_T)(lo+i), FALSE));
+
+	/* Error check - was the Python string creation OK? */
+	if (str == NULL)
+	{
+	    Py_DECREF(list);
+	    return NULL;
+	}
+
+	/* Set the list item */
+	if (PyList_SetItem(list, i, str))
+	{
+	    Py_DECREF(str);
+	    Py_DECREF(list);
+	    return NULL;
+	}
+    }
+
+    /* The ownership of the Python list is passed to the caller (ie,
+     * the caller should Py_DECREF() the object when it is finished
+     * with it).
+     */
+
+    return list;
+}
+
+/*
+ * Check if deleting lines made the cursor position invalid.
+ * Changed the lines from "lo" to "hi" and added "extra" lines (negative if
+ * deleted).
+ */
+    static void
+py_fix_cursor(int lo, int hi, int extra)
+{
+    if (curwin->w_cursor.lnum >= lo)
+    {
+	/* Adjust the cursor position if it's in/after the changed
+	 * lines. */
+	if (curwin->w_cursor.lnum >= hi)
+	{
+	    curwin->w_cursor.lnum += extra;
+	    check_cursor_col();
+	}
+	else if (extra < 0)
+	{
+	    curwin->w_cursor.lnum = lo;
+	    check_cursor();
+	}
+	changed_cline_bef_curs();
+    }
+    invalidate_botline();
+}
+
+/* Replace a line in the specified buffer. The line number is
+ * in Vim format (1-based). The replacement line is given as
+ * a Python string object. The object is checked for validity
+ * and correct format. Errors are returned as a value of FAIL.
+ * The return value is OK on success.
+ * If OK is returned and len_change is not NULL, *len_change
+ * is set to the change in the buffer length.
+ */
+    static int
+SetBufferLine(buf_T *buf, int n, PyObject *line, int *len_change)
+{
+    /* First of all, we check the thpe of the supplied Python object.
+     * There are three cases:
+     *	  1. NULL, or None - this is a deletion.
+     *	  2. A string	   - this is a replacement.
+     *	  3. Anything else - this is an error.
+     */
+    if (line == Py_None || line == NULL)
+    {
+	buf_T *savebuf = curbuf;
+
+	PyErr_Clear();
+	curbuf = buf;
+
+	if (u_savedel((linenr_T)n, 1L) == FAIL)
+	    PyErr_SetVim(_("cannot save undo information"));
+	else if (ml_delete((linenr_T)n, FALSE) == FAIL)
+	    PyErr_SetVim(_("cannot delete line"));
+	else
+	{
+	    deleted_lines_mark((linenr_T)n, 1L);
+	    if (buf == curwin->w_buffer)
+		py_fix_cursor(n, n + 1, -1);
+	}
+
+	curbuf = savebuf;
+
+	if (PyErr_Occurred() || VimErrorCheck())
+	    return FAIL;
+
+	if (len_change)
+	    *len_change = -1;
+
+	return OK;
+    }
+    else if (PyString_Check(line))
+    {
+	char *save = StringToLine(line);
+	buf_T *savebuf = curbuf;
+
+	if (save == NULL)
+	    return FAIL;
+
+	/* We do not need to free "save" if ml_replace() consumes it. */
+	PyErr_Clear();
+	curbuf = buf;
+
+	if (u_savesub((linenr_T)n) == FAIL)
+	{
+	    PyErr_SetVim(_("cannot save undo information"));
+	    vim_free(save);
+	}
+	else if (ml_replace((linenr_T)n, (char_u *)save, FALSE) == FAIL)
+	{
+	    PyErr_SetVim(_("cannot replace line"));
+	    vim_free(save);
+	}
+	else
+	    changed_bytes((linenr_T)n, 0);
+
+	curbuf = savebuf;
+
+	if (PyErr_Occurred() || VimErrorCheck())
+	    return FAIL;
+
+	if (len_change)
+	    *len_change = 0;
+
+	return OK;
+    }
+    else
+    {
+	PyErr_BadArgument();
+	return FAIL;
+    }
+}
+
+/* Replace a range of lines in the specified buffer. The line numbers are in
+ * Vim format (1-based). The range is from lo up to, but not including, hi.
+ * The replacement lines are given as a Python list of string objects. The
+ * list is checked for validity and correct format. Errors are returned as a
+ * value of FAIL.  The return value is OK on success.
+ * If OK is returned and len_change is not NULL, *len_change
+ * is set to the change in the buffer length.
+ */
+    static int
+SetBufferLineList(buf_T *buf, int lo, int hi, PyObject *list, int *len_change)
+{
+    /* First of all, we check the thpe of the supplied Python object.
+     * There are three cases:
+     *	  1. NULL, or None - this is a deletion.
+     *	  2. A list	   - this is a replacement.
+     *	  3. Anything else - this is an error.
+     */
+    if (list == Py_None || list == NULL)
+    {
+	int	i;
+	int	n = hi - lo;
+	buf_T	*savebuf = curbuf;
+
+	PyErr_Clear();
+	curbuf = buf;
+
+	if (u_savedel((linenr_T)lo, (long)n) == FAIL)
+	    PyErr_SetVim(_("cannot save undo information"));
+	else
+	{
+	    for (i = 0; i < n; ++i)
+	    {
+		if (ml_delete((linenr_T)lo, FALSE) == FAIL)
+		{
+		    PyErr_SetVim(_("cannot delete line"));
+		    break;
+		}
+	    }
+	    deleted_lines_mark((linenr_T)lo, (long)i);
+
+	    if (buf == curwin->w_buffer)
+		py_fix_cursor(lo, hi, -n);
+	}
+
+	curbuf = savebuf;
+
+	if (PyErr_Occurred() || VimErrorCheck())
+	    return FAIL;
+
+	if (len_change)
+	    *len_change = -n;
+
+	return OK;
+    }
+    else if (PyList_Check(list))
+    {
+	int	i;
+	int	new_len = PyList_Size(list);
+	int	old_len = hi - lo;
+	int	extra = 0;	/* lines added to text, can be negative */
+	char	**array;
+	buf_T	*savebuf;
+
+	if (new_len == 0)	/* avoid allocating zero bytes */
+	    array = NULL;
+	else
+	{
+	    array = (char **)alloc((unsigned)(new_len * sizeof(char *)));
+	    if (array == NULL)
+	    {
+		PyErr_NoMemory();
+		return FAIL;
+	    }
+	}
+
+	for (i = 0; i < new_len; ++i)
+	{
+	    PyObject *line = PyList_GetItem(list, i);
+
+	    array[i] = StringToLine(line);
+	    if (array[i] == NULL)
+	    {
+		while (i)
+		    vim_free(array[--i]);
+		vim_free(array);
+		return FAIL;
+	    }
+	}
+
+	savebuf = curbuf;
+
+	PyErr_Clear();
+	curbuf = buf;
+
+	if (u_save((linenr_T)(lo-1), (linenr_T)hi) == FAIL)
+	    PyErr_SetVim(_("cannot save undo information"));
+
+	/* If the size of the range is reducing (ie, new_len < old_len) we
+	 * need to delete some old_len. We do this at the start, by
+	 * repeatedly deleting line "lo".
+	 */
+	if (!PyErr_Occurred())
+	{
+	    for (i = 0; i < old_len - new_len; ++i)
+		if (ml_delete((linenr_T)lo, FALSE) == FAIL)
+		{
+		    PyErr_SetVim(_("cannot delete line"));
+		    break;
+		}
+	    extra -= i;
+	}
+
+	/* For as long as possible, replace the existing old_len with the
+	 * new old_len. This is a more efficient operation, as it requires
+	 * less memory allocation and freeing.
+	 */
+	if (!PyErr_Occurred())
+	{
+	    for (i = 0; i < old_len && i < new_len; ++i)
+		if (ml_replace((linenr_T)(lo+i), (char_u *)array[i], FALSE)
+								      == FAIL)
+		{
+		    PyErr_SetVim(_("cannot replace line"));
+		    break;
+		}
+	}
+	else
+	    i = 0;
+
+	/* Now we may need to insert the remaining new old_len. If we do, we
+	 * must free the strings as we finish with them (we can't pass the
+	 * responsibility to vim in this case).
+	 */
+	if (!PyErr_Occurred())
+	{
+	    while (i < new_len)
+	    {
+		if (ml_append((linenr_T)(lo + i - 1),
+					(char_u *)array[i], 0, FALSE) == FAIL)
+		{
+		    PyErr_SetVim(_("cannot insert line"));
+		    break;
+		}
+		vim_free(array[i]);
+		++i;
+		++extra;
+	    }
+	}
+
+	/* Free any left-over old_len, as a result of an error */
+	while (i < new_len)
+	{
+	    vim_free(array[i]);
+	    ++i;
+	}
+
+	/* Free the array of old_len. All of its contents have now
+	 * been dealt with (either freed, or the responsibility passed
+	 * to vim.
+	 */
+	vim_free(array);
+
+	/* Adjust marks. Invalidate any which lie in the
+	 * changed range, and move any in the remainder of the buffer.
+	 */
+	mark_adjust((linenr_T)lo, (linenr_T)(hi - 1),
+						  (long)MAXLNUM, (long)extra);
+	changed_lines((linenr_T)lo, 0, (linenr_T)hi, (long)extra);
+
+	if (buf == curwin->w_buffer)
+	    py_fix_cursor(lo, hi, extra);
+
+	curbuf = savebuf;
+
+	if (PyErr_Occurred() || VimErrorCheck())
+	    return FAIL;
+
+	if (len_change)
+	    *len_change = new_len - old_len;
+
+	return OK;
+    }
+    else
+    {
+	PyErr_BadArgument();
+	return FAIL;
+    }
+}
+
+/* Insert a number of lines into the specified buffer after the specifed line.
+ * The line number is in Vim format (1-based). The lines to be inserted are
+ * given as a Python list of string objects or as a single string. The lines
+ * to be added are checked for validity and correct format. Errors are
+ * returned as a value of FAIL.  The return value is OK on success.
+ * If OK is returned and len_change is not NULL, *len_change
+ * is set to the change in the buffer length.
+ */
+    static int
+InsertBufferLines(buf_T *buf, int n, PyObject *lines, int *len_change)
+{
+    /* First of all, we check the type of the supplied Python object.
+     * It must be a string or a list, or the call is in error.
+     */
+    if (PyString_Check(lines))
+    {
+	char	*str = StringToLine(lines);
+	buf_T	*savebuf;
+
+	if (str == NULL)
+	    return FAIL;
+
+	savebuf = curbuf;
+
+	PyErr_Clear();
+	curbuf = buf;
+
+	if (u_save((linenr_T)n, (linenr_T)(n+1)) == FAIL)
+	    PyErr_SetVim(_("cannot save undo information"));
+	else if (ml_append((linenr_T)n, (char_u *)str, 0, FALSE) == FAIL)
+	    PyErr_SetVim(_("cannot insert line"));
+	else
+	    appended_lines_mark((linenr_T)n, 1L);
+
+	vim_free(str);
+	curbuf = savebuf;
+	update_screen(VALID);
+
+	if (PyErr_Occurred() || VimErrorCheck())
+	    return FAIL;
+
+	if (len_change)
+	    *len_change = 1;
+
+	return OK;
+    }
+    else if (PyList_Check(lines))
+    {
+	int	i;
+	int	size = PyList_Size(lines);
+	char	**array;
+	buf_T	*savebuf;
+
+	array = (char **)alloc((unsigned)(size * sizeof(char *)));
+	if (array == NULL)
+	{
+	    PyErr_NoMemory();
+	    return FAIL;
+	}
+
+	for (i = 0; i < size; ++i)
+	{
+	    PyObject *line = PyList_GetItem(lines, i);
+	    array[i] = StringToLine(line);
+
+	    if (array[i] == NULL)
+	    {
+		while (i)
+		    vim_free(array[--i]);
+		vim_free(array);
+		return FAIL;
+	    }
+	}
+
+	savebuf = curbuf;
+
+	PyErr_Clear();
+	curbuf = buf;
+
+	if (u_save((linenr_T)n, (linenr_T)(n + 1)) == FAIL)
+	    PyErr_SetVim(_("cannot save undo information"));
+	else
+	{
+	    for (i = 0; i < size; ++i)
+	    {
+		if (ml_append((linenr_T)(n + i),
+					(char_u *)array[i], 0, FALSE) == FAIL)
+		{
+		    PyErr_SetVim(_("cannot insert line"));
+
+		    /* Free the rest of the lines */
+		    while (i < size)
+			vim_free(array[i++]);
+
+		    break;
+		}
+		vim_free(array[i]);
+	    }
+	    if (i > 0)
+		appended_lines_mark((linenr_T)n, (long)i);
+	}
+
+	/* Free the array of lines. All of its contents have now
+	 * been freed.
+	 */
+	vim_free(array);
+
+	curbuf = savebuf;
+	update_screen(VALID);
+
+	if (PyErr_Occurred() || VimErrorCheck())
+	    return FAIL;
+
+	if (len_change)
+	    *len_change = size;
+
+	return OK;
+    }
+    else
+    {
+	PyErr_BadArgument();
+	return FAIL;
+    }
+}
+
+/* Convert a Vim line into a Python string.
+ * All internal newlines are replaced by null characters.
+ *
+ * On errors, the Python exception data is set, and NULL is returned.
+ */
+    static PyObject *
+LineToString(const char *str)
+{
+    PyObject *result;
+    int len = strlen(str);
+    char *p;
+
+    /* Allocate an Python string object, with uninitialised contents. We
+     * must do it this way, so that we can modify the string in place
+     * later. See the Python source, Objects/stringobject.c for details.
+     */
+    result = PyString_FromStringAndSize(NULL, len);
+    if (result == NULL)
+	return NULL;
+
+    p = PyString_AsString(result);
+
+    while (*str)
+    {
+	if (*str == '\n')
+	    *p = '\0';
+	else
+	    *p = *str;
+
+	++p;
+	++str;
+    }
+
+    return result;
+}
+
+/* Convert a Python string into a Vim line.
+ *
+ * The result is in allocated memory. All internal nulls are replaced by
+ * newline characters. It is an error for the string to contain newline
+ * characters.
+ *
+ * On errors, the Python exception data is set, and NULL is returned.
+ */
+    static char *
+StringToLine(PyObject *obj)
+{
+    const char *str;
+    char *save;
+    int len;
+    int i;
+
+    if (obj == NULL || !PyString_Check(obj))
+    {
+	PyErr_BadArgument();
+	return NULL;
+    }
+
+    str = PyString_AsString(obj);
+    len = PyString_Size(obj);
+
+    /* Error checking: String must not contain newlines, as we
+     * are replacing a single line, and we must replace it with
+     * a single line.
+     */
+    if (memchr(str, '\n', len))
+    {
+	PyErr_SetVim(_("string cannot contain newlines"));
+	return NULL;
+    }
+
+    /* Create a copy of the string, with internal nulls replaced by
+     * newline characters, as is the vim convention.
+     */
+    save = (char *)alloc((unsigned)(len+1));
+    if (save == NULL)
+    {
+	PyErr_NoMemory();
+	return NULL;
+    }
+
+    for (i = 0; i < len; ++i)
+    {
+	if (str[i] == '\0')
+	    save[i] = '\n';
+	else
+	    save[i] = str[i];
+    }
+
+    save[i] = '\0';
+
+    return save;
+}
+
+/* Check to see whether a Vim error has been reported, or a keyboard
+ * interrupt has been detected.
+ */
+    static int
+VimErrorCheck(void)
+{
+    if (got_int)
+    {
+	PyErr_SetNone(PyExc_KeyboardInterrupt);
+	return 1;
+    }
+    else if (did_emsg && !PyErr_Occurred())
+    {
+	PyErr_SetNone(VimError);
+	return 1;
+    }
+
+    return 0;
+}
+
+
+/* Don't generate a prototype for the next function, it generates an error on
+ * newer Python versions. */
+#if PYTHON_API_VERSION < 1007 /* Python 1.4 */ && !defined(PROTO)
+
+    char *
+Py_GetProgramName(void)
+{
+    return "vim";
+}
+#endif /* Python 1.4 */