Add example that uses readline.readline().

Skip Montanaro · Skip Montanaro · commit b98a8ba14db9 · 2004-05-23T19:06:41.000Z
diff --git a/Doc/lib/libreadline.tex b/Doc/lib/libreadline.tex
@@ -159,3 +159,36 @@ \subsection{Example \label{readline-example}}
 del os, histfile
 \end{verbatim}
 
+The following example extends the \class{code.InteractiveConsole} class to
+support command line editing and history save/restore.
+
+\begin{verbatim}
+import code
+import readline
+import atexit
+import os
+
+class HistoryConsole(code.InteractiveConsole):
+    def __init__(self, locals=None, filename="<console>",
+                 histfile=os.path.expanduser("~/.console-history")):
+        code.InteractiveConsole.__init__(self)
+        self.init_history(histfile)
+
+    def init_history(self, histfile):
+        readline.parse_and_bind("tab: complete")
+        if hasattr(readline, "read_history_file"):
+            try:
+                readline.read_history_file(histfile)
+            except IOError:
+                pass
+            atexit.register(self.save_history, histfile)
+
+    def raw_input(self, prompt=""):
+        line = readline.readline(prompt)
+        if line:
+            readline.add_history(line)
+        return line
+
+    def save_history(self, histfile):
+        readline.write_history_file(histfile)
+\end{verbatim}
