[PATCH] revision: remove stray whitespace when name empty

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Teach show_object_with_name() to avoid writing a space before a name
which is empty. Also teach tests for rev-list --objects --filter to not
require a space between the object ID and name.

show_object_with_name() inserts a space between an object's OID and name
regardless of whether the name is empty or not. This causes 'git
cat-file (--batch | --batch-check)' to fail to discover the type of root
directories:

  git rev-list --objects --filter=tree:1 --max-count=1 HEAD \
    | git cat-file --batch-check
  git rev-parse HEAD: | xargs -I% git cat-file -t %
  git rev-list --objects --filter=tree:1 --max-count=1 HEAD \
    | xargs -I% echo "AA%AA"
  git rev-list --objects --filter=tree:1 --max-count=1 HEAD \
    | cut -f 1 -d ' ' | git cat-file --batch-check

The extra space provided by 'show_object_with_name()' sticks to the
output of 'git rev-list' even if it's piped into a file.

Signed-off-by: Emily Shaffer <emilyshaffer@xxxxxxxxxx>
---
I don't see any reason _not_ to remove this stray whitespace at the end,
since it seems like it just gets in the way of easy scripting. I also
think this case will only present itself for root trees.

Not sure if making the whitespace optional is the right solution for the
test, although I couldn't come up with a cleaner approach. Maybe
something like this would be better, even though handling it in the
regex is shorter?

  if [[ -z "$name" ]] then
    grep "^$hash" actual
  else
    grep "^$hash $name" actual
  fi

 - Emily

 revision.c                          | 3 ++-
 t/t6112-rev-list-filters-objects.sh | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/revision.c b/revision.c
index d4aaf0ef25..260258b371 100644
--- a/revision.c
+++ b/revision.c
@@ -40,7 +40,8 @@ void show_object_with_name(FILE *out, struct object *obj, const char *name)
 {
 	const char *p;
 
-	fprintf(out, "%s ", oid_to_hex(&obj->oid));
+	fprintf(out, "%s%s", oid_to_hex(&obj->oid),
+		strcmp(name, "") == 0 ? "" : " ");
 	for (p = name; *p && *p != '\n'; p++)
 		fputc(*p, out);
 	fputc('\n', out);
diff --git a/t/t6112-rev-list-filters-objects.sh b/t/t6112-rev-list-filters-objects.sh
index acd7f5ab80..e05faa7a67 100755
--- a/t/t6112-rev-list-filters-objects.sh
+++ b/t/t6112-rev-list-filters-objects.sh
@@ -288,7 +288,7 @@ expect_has () {
 	name=$2 &&
 
 	hash=$(git -C r3 rev-parse $commit:$name) &&
-	grep "^$hash $name$" actual
+	grep "^$hash \?$name$" actual
 }
 
 test_expect_success 'verify tree:1 includes root trees' '
-- 
2.22.0.rc2.383.gf4fbbf30c2-goog




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