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, 48 insertions, 3 deletions

diff --git a/lib/kernel/test/interactive_shell_SUITE.erl b/lib/kernel/test/interactive_shell_SUITE.erl
index d7d9434b1f..a375adceea 100644
--- a/lib/kernel/test/interactive_shell_SUITE.erl
+++ b/lib/kernel/test/interactive_shell_SUITE.erl
@@ -22,7 +22,7 @@
 	 init_per_group/2,end_per_group/2, 
 	 get_columns_and_rows/1, exit_initial/1, job_control_local/1, 
 	 job_control_remote/1,
-	 job_control_remote_noshell/1]).
+	 job_control_remote_noshell/1,ctrl_keys/1]).
 
 -export([init_per_testcase/2, end_per_testcase/2]).
 %% For spawn
@@ -41,7 +41,8 @@ suite() -> [{ct_hooks,[ts_install_cth]}].
 
 all() -> 
     [get_columns_and_rows, exit_initial, job_control_local,
-     job_control_remote, job_control_remote_noshell].
+     job_control_remote, job_control_remote_noshell,
+     ctrl_keys].
 
 groups() -> 
     [].
@@ -289,7 +290,51 @@ job_control_remote_noshell(Config) when is_list(Config) ->
 	    ?line stop_noshell_node(NSNode),
 	    ?line Res
     end.
-	    
+
+ctrl_keys(suite) -> [];
+ctrl_keys(doc) -> ["Tests various control keys"];
+ctrl_keys(_Conf) when is_list(_Conf) ->
+    Cu=[$\^u],
+    Cw=[$\^w],
+    Home=[27,$O,$H],
+    End=[27,$O,$F],
+    rtnode([{putline,""},
+	    {putline,"2."},
+	    {getline,"2"},
+	    {putline,"\"hello "++Cw++"world\"."},	% test <CTRL>+W
+	    {getline,"\"world\""},
+	    {putline,"\"hello "++Cu++"\"world\"."},	% test <CTRL>+U
+	    {getline,"\"world\""},
+	    {putline,"world\"."++Home++"\"hello "},	% test <HOME>
+	    {getline,"\"hello world\""},
+	    {putline,"world"++Home++"\"hello "++End++"\"."},	% test <END>
+	    {getline,"\"hello world\""}]
+	    ++wordLeft()++wordRight(),[]).
+
+
+wordLeft() ->
+    L1=[27,27,$[,$D],
+    L2=[27]++"[5D",
+    L3=[27]++"[1;5D",
+    wordLeft(L1)++wordLeft(L2)++wordLeft(L3).
+
+wordLeft(Chars) ->
+    End=[27,$O,$F],
+    [{putline,"\"world\""++Chars++"hello "++End++"."},
+     {getline,"\"hello world\""}].
+
+wordRight() ->
+    R1=[27,27,$[,$C],
+    R2=[27]++"[5C",
+    R3=[27]++"[1;5C",
+    wordRight(R1)++wordRight(R2)++wordRight(R3).
+
+wordRight(Chars) ->
+    Home=[27,$O,$H],
+    [{putline,"world"++Home++"\"hello "++Chars++"\"."},
+     {getline,"\"hello world\""}].
+
+
 rtnode(C,N) ->
     rtnode(C,N,[]).
 rtnode(Commands,Nodename,ErlPrefix) ->