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- /* This module makes GNU readline available to Python. It has ideas
- * contributed by Lee Busby, LLNL, and William Magro, Cornell Theory
- * Center. The completer interface was inspired by Lele Gaifax.
- *
- * More recently, it was largely rewritten by Guido van Rossum who is
- * now maintaining it.
- */
-
- /* Standard definitions */
- #include "Python.h"
- #include <setjmp.h>
- #include <signal.h>
- #include <errno.h>
-
- #ifdef HAVE_UNISTD_H
- #include <unistd.h> /* For isatty() */
- #endif
-
- /* GNU readline definitions */
- /* If you have string.h, you might need to add yourself to this #if... [cjh] */
- #if defined(__BEOS__)
- #undef HAVE_CONFIG_H
- /* At max warnings, we need protos for everything. [cjh] */
- #include <readline/readline.h>
- #include <readline/history.h>
- #include <unistd.h>
- #else
- #include <readline/readline.h> /* You may need to add an -I option to Setup */
-
- extern int rl_parse_and_bind();
- extern int rl_read_init_file();
- extern int rl_insert_text();
- extern int rl_bind_key();
- extern int rl_bind_key_in_map();
- extern int rl_initialize();
- extern int add_history();
- extern Function *rl_event_hook;
- #endif
-
- /* Pointers needed from outside (but not declared in a header file). */
- extern int (*PyOS_InputHook)();
- extern char *(*PyOS_ReadlineFunctionPointer) Py_PROTO((char *));
-
-
- /* Exported function to send one line to readline's init file parser */
-
- static PyObject *
- parse_and_bind(self, args)
- PyObject *self;
- PyObject *args;
- {
- char *s, *copy;
- if (!PyArg_ParseTuple(args, "s:parse_and_bind", &s))
- return NULL;
- /* Make a copy -- rl_parse_and_bind() modifies its argument */
- /* Bernard Herzog */
- copy = malloc(1 + strlen(s));
- if (copy == NULL)
- return PyErr_NoMemory();
- strcpy(copy, s);
- rl_parse_and_bind(copy);
- free(copy); /* Free the copy */
- Py_INCREF(Py_None);
- return Py_None;
- }
-
- static char doc_parse_and_bind[] = "\
- parse_and_bind(string) -> None\n\
- Parse and execute single line of a readline init file.\
- ";
-
-
- /* Exported function to parse a readline init file */
-
- static PyObject *
- read_init_file(self, args)
- PyObject *self;
- PyObject *args;
- {
- char *s = NULL;
- if (!PyArg_ParseTuple(args, "|z:read_init_file", &s))
- return NULL;
- errno = rl_read_init_file(s);
- if (errno)
- return PyErr_SetFromErrno(PyExc_IOError);
- Py_INCREF(Py_None);
- return Py_None;
- }
-
- static char doc_read_init_file[] = "\
- read_init_file([filename]) -> None\n\
- Parse a readline initialization file.\n\
- The default filename is the last filename used.\
- ";
-
-
- /* Exported function to specify a word completer in Python */
-
- static PyObject *completer = NULL;
- static PyThreadState *tstate = NULL;
-
- static PyObject *begidx = NULL;
- static PyObject *endidx = NULL;
-
- /* get the beginning index for the scope of the tab-completion */
- static PyObject *
- get_begidx(self, args)
- PyObject *self;
- PyObject *args;
- {
- if(!PyArg_NoArgs(args)) {
- return NULL;
- }
- Py_INCREF(begidx);
- return begidx;
- }
-
- static char doc_get_begidx[] = "\
- get_begidx() -> int\n\
- get the beginning index of the readline tab-completion scope";
-
- /* get the ending index for the scope of the tab-completion */
- static PyObject *
- get_endidx(self, args)
- PyObject *self;
- PyObject *args;
- {
- if(!PyArg_NoArgs(args)) {
- return NULL;
- }
- Py_INCREF(endidx);
- return endidx;
- }
-
- static char doc_get_endidx[] = "\
- get_endidx() -> int\n\
- get the ending index of the readline tab-completion scope";
-
-
- /* set the tab-completion word-delimiters that readline uses */
-
- static PyObject *
- set_completer_delims(self, args)
- PyObject *self;
- PyObject *args;
- {
- char *break_chars;
-
- if(!PyArg_ParseTuple(args, "s:set_completer_delims", &break_chars)) {
- return NULL;
- }
- free(rl_completer_word_break_characters);
- rl_completer_word_break_characters = strdup(break_chars);
- Py_INCREF(Py_None);
- return Py_None;
- }
-
- static char doc_set_completer_delims[] = "\
- set_completer_delims(string) -> None\n\
- set the readline word delimiters for tab-completion";
-
-
- /* get the tab-completion word-delimiters that readline uses */
-
- static PyObject *
- get_completer_delims(self, args)
- PyObject *self;
- PyObject *args;
- {
- if(!PyArg_NoArgs(args)) {
- return NULL;
- }
- return PyString_FromString(rl_completer_word_break_characters);
- }
-
- static char doc_get_completer_delims[] = "\
- get_completer_delims() -> string\n\
- get the readline word delimiters for tab-completion";
-
- static PyObject *
- set_completer(self, args)
- PyObject *self;
- PyObject *args;
- {
- PyObject *function = Py_None;
- if (!PyArg_ParseTuple(args, "|O:set_completer", &function))
- return NULL;
- if (function == Py_None) {
- Py_XDECREF(completer);
- completer = NULL;
- tstate = NULL;
- }
- else if (PyCallable_Check(function)) {
- PyObject *tmp = completer;
- Py_INCREF(function);
- completer = function;
- Py_XDECREF(tmp);
- tstate = PyThreadState_Get();
- }
- else {
- PyErr_SetString(PyExc_TypeError,
- "set_completer(func): argument not callable");
- return NULL;
- }
- Py_INCREF(Py_None);
- return Py_None;
- }
-
- static char doc_set_completer[] = "\
- set_completer([function]) -> None\n\
- Set or remove the completer function.\n\
- The function is called as function(text, state),\n\
- for i in [0, 1, 2, ...] until it returns a non-string.\n\
- It should return the next possible completion starting with 'text'.\
- ";
-
- /* Exported function to read the current line buffer */
-
- static PyObject *
- get_line_buffer(self, args)
- PyObject *self;
- PyObject *args;
- {
- if (!PyArg_NoArgs(args))
- return NULL;
- return PyString_FromString(rl_line_buffer);
- }
-
- static char doc_get_line_buffer[] = "\
- get_line_buffer() -> string\n\
- return the current contents of the line buffer.\
- ";
-
- /* Exported function to insert text into the line buffer */
-
- static PyObject *
- insert_text(self, args)
- PyObject *self;
- PyObject *args;
- {
- char *s;
- if (!PyArg_ParseTuple(args, "s:insert_text", &s))
- return NULL;
- rl_insert_text(s);
- Py_INCREF(Py_None);
- return Py_None;
- }
-
-
- static char doc_insert_text[] = "\
- insert_text(string) -> None\n\
- Insert text into the command line.\
- ";
-
-
- /* Table of functions exported by the module */
-
- static struct PyMethodDef readline_methods[] =
- {
- {"parse_and_bind", parse_and_bind, 1, doc_parse_and_bind},
- {"get_line_buffer", get_line_buffer, 0, doc_get_line_buffer},
- {"insert_text", insert_text, 1, doc_insert_text},
- {"read_init_file", read_init_file, 1, doc_read_init_file},
- {"set_completer", set_completer, 1, doc_set_completer},
- {"get_begidx", get_begidx, 0, doc_get_begidx},
- {"get_endidx", get_endidx, 0, doc_get_endidx},
-
- {"set_completer_delims", set_completer_delims, METH_VARARGS,
- doc_set_completer_delims},
- {"get_completer_delims", get_completer_delims, 0,
- doc_get_completer_delims},
- {0, 0}
- };
-
- /* C function to call the Python completer. */
-
- static char *
- on_completion(text, state)
- char *text;
- int state;
- {
- char *result = NULL;
- if (completer != NULL) {
- PyObject *r;
- PyThreadState *save_tstate;
- /* Note that readline is called with the interpreter
- lock released! */
- save_tstate = PyThreadState_Swap(NULL);
- PyEval_RestoreThread(tstate);
- r = PyObject_CallFunction(completer, "si", text, state);
- if (r == NULL)
- goto error;
- if (r == Py_None) {
- result = NULL;
- }
- else {
- char *s = PyString_AsString(r);
- if (s == NULL)
- goto error;
- result = strdup(s);
- }
- Py_DECREF(r);
- goto done;
- error:
- PyErr_Clear();
- Py_XDECREF(r);
- done:
- PyEval_SaveThread();
- PyThreadState_Swap(save_tstate);
- }
- return result;
- }
-
-
- /* a more flexible constructor that saves the "begidx" and "endidx"
- * before calling the normal completer */
-
- char **
- flex_complete(text, start, end)
- char *text;
- int start;
- int end;
- {
- Py_XDECREF(begidx);
- Py_XDECREF(endidx);
- begidx = PyInt_FromLong((long) start);
- endidx = PyInt_FromLong((long) end);
- return completion_matches(text, *on_completion);
- }
-
- /* Helper to initialize GNU readline properly. */
-
- static void
- setup_readline()
- {
- rl_readline_name = "python";
- /* Force rebind of TAB to insert-tab */
- rl_bind_key('\t', rl_insert);
- /* Bind both ESC-TAB and ESC-ESC to the completion function */
- rl_bind_key_in_map ('\t', rl_complete, emacs_meta_keymap);
- rl_bind_key_in_map ('\033', rl_complete, emacs_meta_keymap);
- /* Set our completion function */
- rl_attempted_completion_function = (CPPFunction *)flex_complete;
- /* Set Python word break characters */
- rl_completer_word_break_characters =
- strdup(" \t\n`~!@#$%^&*()-=+[{]}\\|;:'\",<>/?");
- /* All nonalphanums except '.' */
-
- begidx = PyInt_FromLong(0L);
- endidx = PyInt_FromLong(0L);
- /* Initialize (allows .inputrc to override)
- *
- * XXX: A bug in the readline-2.2 library causes a memory leak
- * inside this function. Nothing we can do about it.
- */
- rl_initialize();
- }
-
-
- /* Interrupt handler */
-
- static jmp_buf jbuf;
-
- /* ARGSUSED */
- static RETSIGTYPE
- onintr(sig)
- int sig;
- {
- longjmp(jbuf, 1);
- }
-
-
- /* Wrapper around GNU readline that handles signals differently. */
-
- static char *
- call_readline(prompt)
- char *prompt;
- {
- int n;
- char *p, *q;
- RETSIGTYPE (*old_inthandler)();
- old_inthandler = signal(SIGINT, onintr);
- if (setjmp(jbuf)) {
- #ifdef HAVE_SIGRELSE
- /* This seems necessary on SunOS 4.1 (Rasmus Hahn) */
- sigrelse(SIGINT);
- #endif
- signal(SIGINT, old_inthandler);
- return NULL;
- }
- rl_event_hook = PyOS_InputHook;
- p = readline(prompt);
- signal(SIGINT, old_inthandler);
-
- /* We must return a buffer allocated with PyMem_Malloc. */
- if (p == NULL) {
- p = PyMem_Malloc(1);
- if (p != NULL)
- *p = '\0';
- return p;
- }
- n = strlen(p);
- if (n > 0)
- add_history(p);
- /* Copy the malloc'ed buffer into a PyMem_Malloc'ed one and
- release the original. */
- q = p;
- p = PyMem_Malloc(n+2);
- if (p != NULL) {
- strncpy(p, q, n);
- p[n] = '\n';
- p[n+1] = '\0';
- }
- free(q);
- return p;
- }
-
-
- /* Initialize the module */
-
- static char doc_module[] =
- "Importing this module enables command line editing using GNU readline.";
-
- DL_EXPORT(void)
- initreadline()
- {
- PyObject *m;
-
- m = Py_InitModule4("readline", readline_methods, doc_module,
- (PyObject *)NULL, PYTHON_API_VERSION);
- if (isatty(fileno(stdin))) {
- PyOS_ReadlineFunctionPointer = call_readline;
- setup_readline();
- }
- }
-