make edlin understand a few important control keys

Hi Fredrik,

> I've gotten some feedback from your review,
> You need to add documentation under Erts-> "User's Guide" -> "tty - A
> command line interface"
>
> You need to add testcase in interactive_shell_SUITE a simplified
> example of how this testcase could look like;
> ctrl_w_and_ctrl_u(_Conf) ->
>     rtnode([{putline,""}, {putline, "2."}, {getline, "2"},
> {putline,"xxx yy"++[$\^w]++"."}, {getline,"xxx"}, {putline,"xxx
> yy"++[$\^u]++"z."}, {getline,"z"}],[]).

Please find an updated version of the patch attached to this e-mail. I
hope that you still accept it via e-mail because the former patch was
sent the same way ;-).

I have extended the documentation to list the new key combinations and
added tests to make sure they work.

Kind regards,

--
Dr. Stefan Zegenhagen

arcutronix GmbH
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Germany

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>From ce4b827c78d18f39bb1146fd2959ffd7ae2b4bb6 Mon Sep 17 00:00:00 2001
From: Stefan Zegenhagen <[email protected]>
Date: Mon, 6 May 2013 14:39:07 +0200
Subject: [PATCH] [EDLIN] support a few more control keys

Add support for the following control keys that many users have become
accustomed to:
 - <CTRL>+W         : backward kill word
 - <CTRL>+U         : backward kill line
 - <HOME>           : goto start of line
 - <END>            : goto end of line
 - <CTRL>+<LEFT>    : backward word
 - <CTRL>+<RIGHT>   : forward word

It seems that the <CTRL>+<LEFT|RIGHT> control key sequences are
different between terminal emulators, therefore a few possible
combinations were added (similar to how libreadline is configured).

Documentation and tests are extended to reflect the new functionality.

1 files changed, 25 insertions, 1 deletions

diff --git a/erts/doc/src/tty.xml b/erts/doc/src/tty.xml
index 7d662a2849..15b67c8c7d 100644
--- a/erts/doc/src/tty.xml
+++ b/erts/doc/src/tty.xml
@@ -47,7 +47,7 @@
   <section>
     <title>Normal Mode</title>
     <p>In normal mode keystrokes from the user are collected and interpreted by <c><![CDATA[tty]]></c>. Most of the <em>emacs</em> line editing commands are supported. The following is a complete list of the supported line editing commands.<br></br></p>
-    <p><em>Note:</em>	The notation <c><![CDATA[C-a]]></c> means pressing the control key and the letter <c><![CDATA[a]]></c> simultaneously. <c><![CDATA[M-f]]></c> means pressing the <c><![CDATA[ESC]]></c> key followed by the letter <c><![CDATA[f]]></c>. 
+    <p><em>Note:</em>	The notation <c><![CDATA[C-a]]></c> means pressing the control key and the letter <c><![CDATA[a]]></c> simultaneously. <c><![CDATA[M-f]]></c> means pressing the <c><![CDATA[ESC]]></c> key followed by the letter <c><![CDATA[f]]></c>. <c><![CDATA[Home]]></c> and <c><![CDATA[End]]></c> represent the keys with the same name on the keyboard, whereas <c><![CDATA[Left]]></c> and <c><![CDATA[Right]]></c> represent the corresponding cursor keys.
       </p>
     <table>
       <row>
@@ -55,6 +55,10 @@
         <cell align="left" valign="middle"><em>Function</em></cell>
       </row>
       <row>
+        <cell align="left" valign="middle">Home</cell>
+        <cell align="left" valign="middle">Beginning of line</cell>
+      </row>
+      <row>
         <cell align="left" valign="middle">C-a</cell>
         <cell align="left" valign="middle">Beginning of line</cell>
       </row>
@@ -63,6 +67,10 @@
         <cell align="left" valign="middle">Backward character</cell>
       </row>
       <row>
+        <cell align="left" valign="middle">C-Left</cell>
+        <cell align="left" valign="middle">Backward word</cell>
+      </row>
+      <row>
         <cell align="left" valign="middle">M-b</cell>
         <cell align="left" valign="middle">Backward word</cell>
       </row>
@@ -75,6 +83,10 @@
         <cell align="left" valign="middle">Delete word</cell>
       </row>
       <row>
+        <cell align="left" valign="middle">End</cell>
+        <cell align="left" valign="middle">End of line</cell>
+      </row>
+      <row>
         <cell align="left" valign="middle">C-e</cell>
         <cell align="left" valign="middle">End of line</cell>
       </row>
@@ -83,6 +95,10 @@
         <cell align="left" valign="middle">Forward character</cell>
       </row>
       <row>
+        <cell align="left" valign="middle">C-Right</cell>
+        <cell align="left" valign="middle">Forward word</cell>
+      </row>
+      <row>
         <cell align="left" valign="middle">M-f</cell>
         <cell align="left" valign="middle">Forward word</cell>
       </row>
@@ -95,6 +111,10 @@
         <cell align="left" valign="middle">Kill line</cell>
       </row>
       <row>
+        <cell align="left" valign="middle">C-u</cell>
+        <cell align="left" valign="middle">Backward kill line</cell>
+      </row>
+      <row>
         <cell align="left" valign="middle">C-l</cell>
         <cell align="left" valign="middle">Redraw line</cell>
       </row>
@@ -111,6 +131,10 @@
         <cell align="left" valign="middle">Transpose characters</cell>
       </row>
       <row>
+        <cell align="left" valign="middle">C-w</cell>
+        <cell align="left" valign="middle">Backward kill word</cell>
+      </row>
+      <row>
         <cell align="left" valign="middle">C-y</cell>
         <cell align="left" valign="middle">Insert previously killed text</cell>
       </row>