[Python-Dev] Re: extending readline functionality (now with patch)

[Michal Vitecek]

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 and here comes the patch :)

Michal Vitecek wrote:
> hello everyone,
>
> attached is a patch against vanilla 2.2.2, which adds three new
> functions to module readline:
>
>    remove_history(pos) -- remove history entry specified by pos
>
>    replace_history_entry(pos, line) -- replace history entry specified
>        by pos with the given line
>
>    get_history_buffer_size() -- get current number of history entries
>
> the libreadline.tex is also modified.
>
>
>    thank you for your consideration,

-- 
		fuf		(fuf@mageo.cz)

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Binary files Python-2.2.2/Doc/lib/.libreadline.tex.swp and Python-2.2.2-ext-readline/Doc/lib/.libreadline.tex.swp differ
diff -uNr Python-2.2.2/Doc/lib/libreadline.tex Python-2.2.2-ext-readline/Doc/lib/libreadline.tex
--- Python-2.2.2/Doc/lib/libreadline.tex	Fri Oct 19 03:18:43 2001
+++ Python-2.2.2-ext-readline/Doc/lib/libreadline.tex	Mon Jan 27 16:41:57 2003
@@ -100,6 +100,18 @@
 Append a line to the history buffer, as if it was the last line typed.
 \end{funcdesc}
 
+\begin{funcdesc}{remove_history}{pos}
+Remove history entry specified by its position from the history.
+\end{funcdesc}
+
+\begin{funcdesc}{replace_history_entry}{pos, line}
+Replace history entry specified by its position with the given line.
+\end{funcdesc}
+
+\begin{funcdesc}{get_history_buffer_length}{}
+Get number of history entries.
+\end{funcdesc}
+
 
 \begin{seealso}
   \seemodule{rlcompleter}{Completion of Python identifiers at the
Binary files Python-2.2.2/Modules/.readline.c.swp and Python-2.2.2-ext-readline/Modules/.readline.c.swp differ
diff -uNr Python-2.2.2/Modules/readline.c Python-2.2.2-ext-readline/Modules/readline.c
--- Python-2.2.2/Modules/readline.c	Sun Oct  6 07:43:47 2002
+++ Python-2.2.2-ext-readline/Modules/readline.c	Mon Jan 27 16:55:55 2003
@@ -302,6 +302,85 @@
 add_history(string) -> None\n\
 add a line to the history buffer";
 
+static PyObject *
+py_remove_history(PyObject *self, PyObject *args)
+{
+        int entry_number;
+        HIST_ENTRY *entry;
+        char buf[80];
+
+        if (!PyArg_ParseTuple(args, "i:remove_history", &entry_number)) {
+                return NULL;
+        }
+        entry = remove_history(entry_number);
+        if (!entry) {
+                PyOS_snprintf(buf, sizeof(buf),
+                              "No history entry at position %i",
+                              entry_number);
+                PyErr_SetString(PyExc_ValueError, buf);
+                return NULL;
+        }
+        if (entry->line)
+            free(entry->line);
+        if (entry->data)
+            free(entry->data);
+        free(entry);
+
+        Py_INCREF(Py_None);
+        return Py_None;
+}
+
+static char doc_remove_history[] = "\
+remove_history(pos) -> None\n\
+removes history entry given by its position in history";
+
+static PyObject *
+py_replace_history_entry(PyObject *self, PyObject *args)
+{
+        int entry_number;
+        char *line;
+        HIST_ENTRY *old_entry;
+        char buf[80];
+
+        if (!PyArg_ParseTuple(args, "is:replace_history_entry", &entry_number, &line)) {
+                return NULL;
+        }
+        old_entry = replace_history_entry(entry_number, line, (void *)NULL);
+        if (!old_entry) {
+                PyOS_snprintf(buf, sizeof(buf),
+                              "No history entry at position %i",
+                              entry_number);
+                PyErr_SetString(PyExc_ValueError, buf);
+                return NULL;
+        }
+        if (old_entry->line)
+            free(old_entry->line);
+        if (old_entry->data)
+            free(old_entry->data);
+        free(old_entry);
+
+        Py_INCREF(Py_None);
+        return Py_None;
+}
+
+static char doc_replace_history_entry[] = "\
+replace_history_entry(pos, line) -> None\n\
+replaces history entry given by its position with contents of line";
+
+static PyObject *
+py_get_history_buffer_length(PyObject *self, PyObject *args)
+{
+        HISTORY_STATE *history_state;
+
+        if (!PyArg_ParseTuple(args, ":get_history_buffer_length"))
+                return NULL;
+        history_state = history_get_history_state();
+        return Py_BuildValue("i", history_state->length);
+}
+
+static char doc_get_history_buffer_length[] = "\
+get_history_buffer_length() -> length\n\
+returns number of entries in the history";
 
 /* get the tab-completion word-delimiters that readline uses */
 
@@ -391,8 +470,10 @@
 	{"set_completer_delims", set_completer_delims, 
 	 METH_VARARGS, doc_set_completer_delims},
 	{"add_history", py_add_history, METH_VARARGS, doc_add_history},
-	{"get_completer_delims", get_completer_delims, 
-	 METH_OLDARGS, doc_get_completer_delims},
+        {"remove_history", py_remove_history, METH_VARARGS, doc_remove_history},
+        {"replace_history_entry", py_replace_history_entry, METH_VARARGS, doc_replace_history_entry},
+        {"get_history_buffer_length", py_get_history_buffer_length, METH_VARARGS, doc_get_history_buffer_length},
+	{"get_completer_delims", get_completer_delims, METH_OLDARGS, doc_get_completer_delims},
 	
 	{"set_startup_hook", set_startup_hook, METH_VARARGS, doc_set_startup_hook},
 #ifdef HAVE_RL_PRE_INPUT_HOOK

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