From b287e2e27a388deecd9d9580f2a846b2b2efff42 Mon Sep 17 00:00:00 2001
From: Eric Andersen
Date: Fri, 8 Aug 2003 23:40:12 +0000
Subject: Use the new 'select' option to make the shell config much less evil
 and far more obvious.  -Erik

---
 shell/Config.in | 65 ++++++++++++++++++++++++---------------------------------
 1 file changed, 27 insertions(+), 38 deletions(-)

diff --git a/shell/Config.in b/shell/Config.in
index 6103ccf..bd6f39f 100644
--- a/shell/Config.in
+++ b/shell/Config.in
@@ -13,15 +13,19 @@ choice
 	  and full featured.
 
 config CONFIG_FEATURE_SH_IS_ASH
+	select CONFIG_ASH
 	bool "ash"
 
 config CONFIG_FEATURE_SH_IS_HUSH
+	select CONFIG_HUSH
 	bool "hush"
 
 config CONFIG_FEATURE_SH_IS_LASH
+	select CONFIG_LASH
 	bool "lash"
 
 config CONFIG_FEATURE_SH_IS_MSH
+	select CONFIG_MSH
 	bool "msh"
 
 config CONFIG_FEATURE_SH_IS_NONE
@@ -29,20 +33,15 @@ config CONFIG_FEATURE_SH_IS_NONE
 
 endchoice
 
-if CONFIG_FEATURE_SH_IS_ASH
-	config CONFIG_ASH
-	default y
-
-	comment "ash (forced enabled as default shell)"
-endif
-	
-if !CONFIG_FEATURE_SH_IS_ASH
 config CONFIG_ASH
 	bool "ash"
 	default y
 	help
-	  Make sh a link to ash.
-endif
+	  Tha 'ash' shell adds about 60k in the default configuration and is
+	  the most complete and most pedantically correct shell included with
+	  busybox.  This shell is actually a derivitive the Debian 'dash' shell
+	  (by Herbert Xu), which was created by porting the 'ash' shell
+	  (written by Kenneth Almquist) from NetBSD.  
 
 comment "Ash Shell Options"
 	depends on CONFIG_ASH
@@ -98,51 +97,41 @@ config CONFIG_ASH_OPTIMIZE_FOR_SIZE
 	help
 	  Compile ash for reduced size at price of speed.
 
-if CONFIG_FEATURE_SH_IS_HUSH
-	config CONFIG_HUSH
-	default y
-
-	comment "hush (forced enabled as default shell)"
-endif
-	
-if !CONFIG_FEATURE_SH_IS_HUSH
 config CONFIG_HUSH
 	bool "hush"
 	default n
 	help
-	  Make sh a link to hush.
-endif
+	  hush is very small shell (just 18k) and it has fairly complete Bourne
+	  shell grammer.  It even handles all the normal flow control options
+	  such as if/then/elif/else/fi, for/in/do/done, while loops, etc.
 
-if CONFIG_FEATURE_SH_IS_LASH
-	config CONFIG_LASH
-	default y
+	  It does not handle case/esac, select, function, here documents ( <<
+	  word ), arithmetic expansion, aliases, brace expansion, tilde
+	  expansion, &> and >& redirection of stdout+stderr, etc.
 
-	comment "lash (forced enabled as default shell)"
-endif
 
-if !CONFIG_FEATURE_SH_IS_LASH
 config CONFIG_LASH
 	bool "lash"
 	default n
 	help
-	  Make sh a link to lash.
-endif
-
-if CONFIG_FEATURE_SH_IS_MSH
-	config CONFIG_MSH
-	default y
+	  lash is the very smallest shell (adds just 10k) and it is quite
+	  usable as a command prompt, but it is not suitable for any but the
+	  most trivial scripting (such as an initrd that calls insmod a few
+	  times) since it does not understand any Bourne shell grammer.  It
+	  does handle pipes, redirects, and job control though.  Adding in
+	  command editing makes it a very nice lightweight command prompt.
 
-	comment "msh (forced enabled as default shell)"
-endif
 
-if !CONFIG_FEATURE_SH_IS_MSH
 config CONFIG_MSH
 	bool "msh"
 	default n
 	help
-	  Make sh a link to msh.
-endif
-
+	  The minix shell (adds just 30k) is quite complete and handles things
+	  like for/do/done, case/esac and all the things you expect a Bourne
+	  shell to do.  It is not always pedantically correct about Bourne
+	  shell grammer (try running the shell testscript "tests/sh.testcases"
+	  on it and compare vs bash) but for most things it works quite well.
+	  It also uses only vfork, so it can be used on uClinux systems.
 
 comment "Bourne Shell Options"
 	depends on CONFIG_MSH || CONFIG_LASH || CONFIG_HUSH || CONFIG_ASH
-- 
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