Use the new 'select' option to make the shell config

much less evil and far more obvious.
 -Erik

diff --git a/shell/Config.in b/shell/Config.in
index 6103ccf..bd6f39f 100644 (file)
--- 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