rev-list: teach --no-object-names to enable piping

Allow easier parsing by cat-file by giving rev-list an option to print
only the OID of a non-commit object without any additional information.
This is a short-term shim; later on, rev-list should be taught how to
print the types of objects it finds in a format similar to cat-file's.

Before this commit, the output from rev-list needed to be massaged
before being piped to cat-file, like so:

git rev-list --objects HEAD | cut -f 1 -d ' ' |
git cat-file --batch-check

This was especially unexpected when dealing with root trees, as an
invisible whitespace exists at the end of the OID:

git rev-list --objects --filter=tree:1 --max-count=1 HEAD |
xargs -I% echo "AA%AA"

Now, it can be piped directly, as in the added test case:

git rev-list --objects --no-object-names HEAD | git cat-file --batch-check

Signed-off-by: Emily Shaffer <emilyshaffer@google.com>
Change-Id: I489bdf0a8215532e540175188883ff7541d70e1b
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-rev-list.txt b/Documentation/git-rev-list.txt
index 88609ff4351bb7793ffa0ce9f21efb39a8157da4..9392760b25411c889d53114fd55886cc7e3fb679 100644 (file)
--- a/Documentation/git-rev-list.txt
+++ b/Documentation/git-rev-list.txt
@@ -48,6 +48,7 @@ SYNOPSIS
             [ --date=<format>]
             [ [ --objects | --objects-edge | --objects-edge-aggressive ]
               [ --unpacked ]
+              [ --object-names | --no-object-names ]
               [ --filter=<filter-spec> [ --filter-print-omitted ] ] ]
             [ --missing=<missing-action> ]
             [ --pretty | --header ]

diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt
index 71a1fcc0939f791fe7f0423f15faf458dd0598f5..286fc163f14256f4f7ff4be7fba57cef963d2f75 100644 (file)
--- a/Documentation/rev-list-options.txt
+++ b/Documentation/rev-list-options.txt
@@ -708,6 +708,16 @@ ifdef::git-rev-list[]
        Only useful with `--objects`; print the object IDs that are not
        in packs.
 
+--object-names::
+       Only useful with `--objects`; print the names of the object IDs
+       that are found. This is the default behavior.
+
+--no-object-names::
+       Only useful with `--objects`; does not print the names of the object
+       IDs that are found. This inverts `--object-names`. This flag allows
+       the output to be more easily parsed by commands such as
+       linkgit:git-cat-file[1].
+
 --filter=<filter-spec>::
        Only useful with one of the `--objects*`; omits objects (usually
        blobs) from the list of printed objects.  The '<filter-spec>'

diff --git a/builtin/rev-list.c b/builtin/rev-list.c
index 660172b01486f5980e96557c071036eaead3c493..301ccb970bb36340bc6b4a136a3029811f252aa2 100644 (file)
--- a/builtin/rev-list.c
+++ b/builtin/rev-list.c
@@ -49,6 +49,7 @@ static const char rev_list_usage[] =
 "    --objects | --objects-edge\n"
 "    --unpacked\n"
 "    --header | --pretty\n"
+"    --[no-]object-names\n"
 "    --abbrev=<n> | --no-abbrev\n"
 "    --abbrev-commit\n"
 "    --left-right\n"
@@ -75,6 +76,9 @@ enum missing_action {
 };
 static enum missing_action arg_missing_action;
 
+/* display only the oid of each object encountered */
+static int arg_show_object_names = 1;
+
 #define DEFAULT_OIDSET_SIZE     (16*1024)
 
 static void finish_commit(struct commit *commit);
@@ -255,7 +259,10 @@ static void show_object(struct object *obj, const char *name, void *cb_data)
        display_progress(progress, ++progress_counter);
        if (info->flags & REV_LIST_QUIET)
                return;
-       show_object_with_name(stdout, obj, name);
+       if (arg_show_object_names)
+               show_object_with_name(stdout, obj, name);
+       else
+               printf("%s\n", oid_to_hex(&obj->oid));
 }
 
 static void show_edge(struct commit *commit)
@@ -484,6 +491,16 @@ int cmd_rev_list(int argc, const char **argv, const char *prefix)
                if (skip_prefix(arg, "--missing=", &arg))
                        continue; /* already handled above */
 
+               if (!strcmp(arg, ("--no-object-names"))) {
+                       arg_show_object_names = 0;
+                       continue;
+               }
+
+               if (!strcmp(arg, ("--object-names"))) {
+                       arg_show_object_names = 1;
+                       continue;
+               }
+
                usage(rev_list_usage);
 
        }

diff --git a/t/t6000-rev-list-misc.sh b/t/t6000-rev-list-misc.sh
index 05079997291fe295aacc80be1f26fd7002f0a898..52a9e38d66f3222f4c02f7d067a9509db685f875 100755 (executable)
--- a/t/t6000-rev-list-misc.sh
+++ b/t/t6000-rev-list-misc.sh
@@ -48,6 +48,26 @@ test_expect_success 'rev-list --objects with pathspecs and copied files' '
        ! grep one output
 '
 
+test_expect_success 'rev-list --objects --no-object-names has no space/names' '
+       git rev-list --objects --no-object-names HEAD >output &&
+       ! grep wanted_file output &&
+       ! grep unwanted_file output &&
+       ! grep " " output
+'
+
+test_expect_success 'rev-list --objects --no-object-names works with cat-file' '
+       git rev-list --objects --no-object-names --all >list-output &&
+       git cat-file --batch-check <list-output >cat-output &&
+       ! grep missing cat-output
+'
+
+test_expect_success '--no-object-names and --object-names are last-one-wins' '
+       git rev-list --objects --no-object-names --object-names --all >output &&
+       grep wanted_file output &&
+       git rev-list --objects --object-names --no-object-names --all >output &&
+       ! grep wanted_file output
+'
+
 test_expect_success 'rev-list A..B and rev-list ^A B are the same' '
        git commit --allow-empty -m another &&
        git tag -a -m "annotated" v1.0 &&