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cat-file: correct and improve usage information

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Change the usage output emitted on "git cat-file -h" to group related
options, making it clear to users which options go with which other
ones.

The new output is:

    Check object existence or emit object contents
        -e                    check if <object> exists
        -p                    pretty-print <object> content

    Emit [broken] object attributes
        -t                    show object type (one of 'blob', 'tree', 'commit', 'tag', ...)
        -s                    show object size
        --allow-unknown-type  allow -s and -t to work with broken/corrupt objects

    Batch objects requested on stdin (or --batch-all-objects)
        --batch[=<format>]    show full <object> or <rev> contents
        --batch-check[=<format>]
                              like --batch, but don't emit <contents>
        --batch-all-objects   with --batch[-check]: ignores stdin, batches all known objects

    Change or optimize batch output
        --buffer              buffer --batch output
        --follow-symlinks     follow in-tree symlinks
        --unordered           do not order objects before emitting them

    Emit object (blob or tree) with conversion or filter (stand-alone, or with batch)
        --textconv            run textconv on object's content
        --filters             run filters on object's content
        --path blob|tree      use a <path> for (--textconv | --filters ); Not with 'batch'

The old usage was:

    <type> can be one of: blob, tree, commit, tag
        -t                    show object type
        -s                    show object size
        -e                    exit with zero when there's no error
        -p                    pretty-print object's content
        --textconv            for blob objects, run textconv on object's content
        --filters             for blob objects, run filters on object's content
        --batch-all-objects   show all objects with --batch or --batch-check
        --path <blob>         use a specific path for --textconv/--filters
        --allow-unknown-type  allow -s and -t to work with broken/corrupt objects
        --buffer              buffer --batch output
        --batch[=<format>]    show info and content of objects fed from the standard input
        --batch-check[=<format>]
                              show info about objects fed from the standard input
        --follow-symlinks     follow in-tree symlinks (used with --batch or --batch-check)
        --unordered           do not order --batch-all-objects output

While shorter, I think the new one is easier to understand, as
e.g. "--allow-unknown-type" is grouped with "-t" and "-s", as it can
only be combined with those options. The same goes for "--buffer",
"--unordered" etc.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Ævar Arnfjörð Bjarmason 2021-12-28 14:28:48 +01:00 committed by Junio C Hamano
parent b3fe468075
commit 57d6a1cf96
1 changed files with 32 additions and 23 deletions
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55
builtin/cat-file.c
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@ -666,35 +666,44 @@ int cmd_cat_file(int argc, const char **argv, const char *prefix)
NULL
};
const struct option options[] = {
OPT_GROUP(N_("<type> can be one of: blob, tree, commit, tag")),
OPT_CMDMODE('t', NULL, &opt, N_("show object type"), 't'),
OPT_CMDMODE('s', NULL, &opt, N_("show object size"), 's'),
/* Simple queries */
OPT_GROUP(N_("Check object existence or emit object contents")),
OPT_CMDMODE('e', NULL, &opt,
N_("exit with zero when there's no error"), 'e'),
OPT_CMDMODE('p', NULL, &opt, N_("pretty-print object's content"), 'p'),
OPT_CMDMODE(0, "textconv", &opt,
N_("for blob objects, run textconv on object's content"), 'c'),
OPT_CMDMODE(0, "filters", &opt,
N_("for blob objects, run filters on object's content"), 'w'),
OPT_CMDMODE(0, "batch-all-objects", &opt,
N_("show all objects with --batch or --batch-check"), 'b'),
OPT_STRING(0, "path", &force_path, N_("blob"),
N_("use a specific path for --textconv/--filters")),
N_("check if <object> exists"), 'e'),
OPT_CMDMODE('p', NULL, &opt, N_("pretty-print <object> content"), 'p'),
OPT_GROUP(N_("Emit [broken] object attributes")),
OPT_CMDMODE('t', NULL, &opt, N_("show object type (one of 'blob', 'tree', 'commit', 'tag', ...)"), 't'),
OPT_CMDMODE('s', NULL, &opt, N_("show object size"), 's'),
OPT_BOOL(0, "allow-unknown-type", &unknown_type,
N_("allow -s and -t to work with broken/corrupt objects")),
/* Batch mode */
OPT_GROUP(N_("Batch objects requested on stdin (or --batch-all-objects)")),
OPT_CALLBACK_F(0, "batch", &batch, N_("format"),
N_("show full <object> or <rev> contents"),
PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
batch_option_callback),
OPT_CALLBACK_F(0, "batch-check", &batch, N_("format"),
N_("like --batch, but don't emit <contents>"),
PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
batch_option_callback),
OPT_CMDMODE(0, "batch-all-objects", &opt,
N_("with --batch[-check]: ignores stdin, batches all known objects"), 'b'),
/* Batch-specific options */
OPT_GROUP(N_("Change or optimize batch output")),
OPT_BOOL(0, "buffer", &batch.buffer_output, N_("buffer --batch output")),
OPT_CALLBACK_F(0, "batch", &batch, "format",
N_("show info and content of objects fed from the standard input"),
PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
batch_option_callback),
OPT_CALLBACK_F(0, "batch-check", &batch, "format",
N_("show info about objects fed from the standard input"),
PARSE_OPT_OPTARG | PARSE_OPT_NONEG,
batch_option_callback),
OPT_BOOL(0, "follow-symlinks", &batch.follow_symlinks,
N_("follow in-tree symlinks (used with --batch or --batch-check)")),
N_("follow in-tree symlinks")),
OPT_BOOL(0, "unordered", &batch.unordered,
N_("do not order --batch-all-objects output")),
N_("do not order objects before emitting them")),
/* Textconv options, stand-ole*/
OPT_GROUP(N_("Emit object (blob or tree) with conversion or filter (stand-alone, or with batch)")),
OPT_CMDMODE(0, "textconv", &opt,
N_("run textconv on object's content"), 'c'),
OPT_CMDMODE(0, "filters", &opt,
N_("run filters on object's content"), 'w'),
OPT_STRING(0, "path", &force_path, N_("blob|tree"),
N_("use a <path> for (--textconv | --filters ); Not with 'batch'")),
OPT_END()
};