Subject: Re: [PATCH/RFC] Changing submodule foreach --recursive to be depth-first, --parent option to execute command in supermodule as well

From: Jens Lehmann <[email-masked]>
Date: Tue, 02 Apr 2013 22:14:06 +0200

Seems were getting closer, some comments from a quick read of your
patch below.

Am 26.03.2013 05:03, schrieb Eric Cousineau:
> From 2c2923ada809d671828aa58dcda05a1b71222b70 Mon Sep 17 00:00:00 2001
> From: Eric Cousineau <[email-masked]>
> Date: Mon, 25 Mar 2013 22:27:06 -0500
> Subject: [PATCH] submodule-foreach: Added in --post-order=<command> and
>  adjusted code per Jens Lehmann's suggestion
> 
> Signed-off-by: Eric Cousineau <[email-masked]>
> ---
> Updated the usage line.
> I had put the locals in there before because I think I was having trouble with resolving some
> of the variables in nested submodules, but now that I've taken them out they seem to work fine.
> I also changed the message for the post-order to say "Exiting".

That's better than "Stopping", but while I'm not a native speaker
I'd propose to use "Leaving" as the opposite of "Entering".

> I did not have a chance to look into why I couldn't group the --post-order stuff into a string
> when passing it on to submodule. I can look at it later on though.
> 
> Now the output is as follows:
> 
> $ git submodule foreach --recursive --post-order 'echo Post $name' 'echo Pre $path'
> Entering 'b'
> Pre b
> Entering 'b/d'
> Pre d
> Exiting 'b/d'
> Post d
> Exiting 'b'
> Post b
> Entering 'c'
> Pre c
> Exiting 'c'
> Post c
> 
>  git-submodule.sh |   35 ++++++++++++++++++++++++++++++-----
>  1 file changed, 30 insertions(+), 5 deletions(-)
> 
> diff --git a/git-submodule.sh b/git-submodule.sh
> index 004c034..4c9923a 100755
> --- a/git-submodule.sh
> +++ b/git-submodule.sh
> @@ -10,7 +10,7 @@ USAGE="[--quiet] add [-b <branch>] [-f|--force] [--name <name>] [--reference <re
>     or: $dashless [--quiet] init [--] [<path>...]
>     or: $dashless [--quiet] update [--init] [--remote] [-N|--no-fetch] [-f|--force] [--rebase] [--reference <repository>] [--merge] [--recursive] [--] [<path>...]
>     or: $dashless [--quiet] summary [--cached|--files] [--summary-limit <n>] [commit] [--] [<path>...]
> -   or: $dashless [--quiet] foreach [--recursive] <command>
> +   or: $dashless [--quiet] foreach [--recursive] [--post-order <command>] <command>
>     or: $dashless [--quiet] sync [--recursive] [--] [<path>...]"
>  OPTIONS_SPEC=
>  . git-sh-setup
> @@ -434,6 +434,8 @@ Use -f if you really want to add it." >&2
>  cmd_foreach()
>  {
>      # parse $args after "submodule ... foreach".
> +    recursive=
> +    post_order=

I'm still not sure we need that here, in fact the problem you have
with the cmd_foreach invocation below might just be because you
reset these variables here instead of once at the top of this file.

>      while test $# -ne 0
>      do
>          case "$1" in
> @@ -443,6 +445,15 @@ cmd_foreach()
>          --recursive)
>              recursive=1
>              ;;
> +        --post-order)
> +            test "$#" = "1" && usage
> +            post_order="$2"
> +            shift
> +            ;;
> +        --post-order=*)
> +            # Will skip empty commands
> +            post_order=${1#*=}
> +            ;;
>          -*)
>              usage
>              ;;
> @@ -465,7 +476,9 @@ cmd_foreach()
>          die_if_unmatched "$mode"
>          if test -e "$sm_path"/.git
>          then
> -            say "$(eval_gettext "Entering '\$prefix\$sm_path'")"
> +            enter_msg="$(eval_gettext "Entering '\$prefix\$sm_path'")"
> +            exit_msg="$(eval_gettext "Exiting '\$prefix\$sm_path'")"
> +            die_msg="$(eval_gettext "Stopping at '\$sm_path'; script returned non-zero status.")"
>              name=$(module_name "$sm_path")
>              (
>                  prefix="$prefix$sm_path/"
> @@ -473,13 +486,25 @@ cmd_foreach()
>                  # we make $path available to scripts ...
>                  path=$sm_path
>                  cd "$sm_path" &&
> -                eval "$@" &&
> +                say "$enter_msg" &&
> +                eval "$@" || die "$die_msg" &&
>                  if test -n "$recursive"
>                  then
> -                    cmd_foreach "--recursive" "$@"
> +                    if test -n "$post_order"
> +                    then
> +                        # tried keeping flags as a variable, but was having difficulty
> +                        cmd_foreach --recursive --post-order "$post_order" "$@"
> +                    else
> +                        cmd_foreach --recursive "$@"
> +                    fi
> +                fi &&
> +                if test -n "$post_order"
> +                then
> +                    say "$exit_msg" &&
> +                    eval "$post_order" || die "$die_msg"
>                  fi
>              ) <&3 3<&- ||
> -            die "$(eval_gettext "Stopping at '\$sm_path'; script returned non-zero status.")"
> +            die "$die_msg"
>          fi
>      done
>  }