Re: [PATCH 4/4] cat-file: support --textconv/--filters in batch mode

> With this patch, --batch can be combined with --textconv or --filters.
> For this to work, the input needs to have the form
> 
> 	<object name><single white space><path>
> 
> so that the filters can be chosen appropriately.
> 
> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
> ---
>  Documentation/git-cat-file.txt | 18 +++++++++++-----
>  builtin/cat-file.c             | 49 +++++++++++++++++++++++++++++++++++++-----
>  t/t8010-cat-file-filters.sh    | 10 +++++++++
>  3 files changed, 67 insertions(+), 10 deletions(-)
> 
> diff --git a/Documentation/git-cat-file.txt b/Documentation/git-cat-file.txt
> index 59a3c37..1f4d954 100644
> --- a/Documentation/git-cat-file.txt
> +++ b/Documentation/git-cat-file.txt
> @@ -10,7 +10,7 @@ SYNOPSIS
>  --------
>  [verse]
>  'git cat-file' (-t [--allow-unknown-type]| -s [--allow-unknown-type]| -e | -p | <type> | --textconv | --filters ) [--use-path=<path>] <object>
> -'git cat-file' (--batch | --batch-check) [--follow-symlinks]
> +'git cat-file' (--batch | --batch-check) [ --textconv | --filters ] [--follow-symlinks]
>  
>  DESCRIPTION
>  -----------
> @@ -20,7 +20,11 @@ object type, or `-s` is used to find the object size, or `--textconv` or
>  `--filters` is used (which imply type "blob").
>  
>  In the second form, a list of objects (separated by linefeeds) is provided on
> -stdin, and the SHA-1, type, and size of each object is printed on stdout.
> +stdin, and the SHA-1, type, and size of each object is printed on stdout. The
> +output format can be overridden using the optional `<format>` argument. If
> +either `--textconv` or `--filters` was specified, the input is expected to
> +list the object names followed by the path name, separated by a single white
> +space, so that the appropriate drivers can be determined.
>  
>  OPTIONS
>  -------
> @@ -72,13 +76,17 @@ OPTIONS
>  --batch::
>  --batch=<format>::
>  	Print object information and contents for each object provided
> -	on stdin.  May not be combined with any other options or arguments.
> -	See the section `BATCH OUTPUT` below for details.
> +	on stdin.  May not be combined with any other options or arguments
> +	except `--textconv` or `--filters`, in which case the input lines
> +	also need to specify the path, separated by white space.  See the
> +	section `BATCH OUTPUT` below for details.
>  
>  --batch-check::
>  --batch-check=<format>::
>  	Print object information for each object provided on stdin.  May
> -	not be combined with any other options or arguments.  See the
> +	not be combined with any other options or arguments except
> +	`--textconv` or `--filters`, in which case the input lines also
> +	need to specify the path, separated by white space.  See the
>  	section `BATCH OUTPUT` below for details.
>  
>  --batch-all-objects::
> diff --git a/builtin/cat-file.c b/builtin/cat-file.c
> index 5ff58b3..5f91cf4 100644
> --- a/builtin/cat-file.c
> +++ b/builtin/cat-file.c
> @@ -17,6 +17,7 @@ struct batch_options {
>  	int print_contents;
>  	int buffer_output;
>  	int all_objects;
> +	int cmdmode; /* may be 'w' or 'c' for --filters or --textconv */