[PATCH v2] blame: improve diagnosis for "--reverse NEW"

[Junio C Hamano <gitster@pobox.com>]

"git blame --reverse OLD..NEW -- PATH" tells us to start from the
contents in PATH at OLD and observe how each line is changed while
the history developers up to NEW, and report for each line the
latest commit up to which the line survives in the original form.

If you say "git blame --reverse NEW -- PATH" by mistake, we complain
about the missing OLD, but we phrased it as "No commit to dig down
to?"  In this case, however, we are digging up from OLD, so say so.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---

 * There was another instance of "dig down to" in the same function.

 Documentation/git-blame.txt | 2 +-
 builtin/blame.c             | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/Documentation/git-blame.txt b/Documentation/git-blame.txt
index ba54175..16323eb 100644
--- a/Documentation/git-blame.txt
+++ b/Documentation/git-blame.txt
@@ -10,7 +10,7 @@ SYNOPSIS
 [verse]
 'git blame' [-c] [-b] [-l] [--root] [-t] [-f] [-n] [-s] [-e] [-p] [-w] [--incremental]
 	    [-L <range>] [-S <revs-file>] [-M] [-C] [-C] [-C] [--since=<date>]
-	    [--progress] [--abbrev=<n>] [<rev> | --contents <file> | --reverse <rev>]
+	    [--progress] [--abbrev=<n>] [<rev> | --contents <file> | --reverse <rev>..<rev>]
 	    [--] <file>
 
 DESCRIPTION
diff --git a/builtin/blame.c b/builtin/blame.c
index 21f42b0..a027b8a 100644
--- a/builtin/blame.c
+++ b/builtin/blame.c
@@ -2466,14 +2466,14 @@ static char *prepare_initial(struct scoreboard *sb)
 		if (obj->type != OBJ_COMMIT)
 			die("Non commit %s?", revs->pending.objects[i].name);
 		if (sb->final)
-			die("More than one commit to dig down to %s and %s?",
+			die("More than one commit to dig up from, %s and %s?",
 			    revs->pending.objects[i].name,
 			    final_commit_name);
 		sb->final = (struct commit *) obj;
 		final_commit_name = revs->pending.objects[i].name;
 	}
 	if (!final_commit_name)
-		die("No commit to dig down to?");
+		die("No commit to dig up from?");
 	return xstrdup(final_commit_name);
 }
 
-- 
2.9.0-290-g8794d48