[PATCH] Teach revision walker about reflog ranges

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Now you can ask for a revision range

	master@{2.weeks.ago..1.day.ago}

or even something like

	HEAD@{20..yesterday}

It does this by allocating an strbuf to construct the second ref string
(in the above examples "master@{1.day.ago}" and "HEAD@{yesterday}",
respectively), which is never free()d.

Signed-off-by: Johannes Schindelin <johannes.schindelin@xxxxxx>
---

	Another nail in the coffin of libification, but for the common 
	one-shot command, it is the easiest way to support reflog ranges.

 revision.c |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/revision.c b/revision.c
index 6e85aaa..3e7a834 100644
--- a/revision.c
+++ b/revision.c
@@ -794,10 +794,24 @@ int handle_revision_arg(const char *arg, struct rev_info *revs,
 		const char *this = arg;
 		int symmetric = *next == '.';
 		unsigned int flags_exclude = flags ^ UNINTERESTING;
+		const char *at;
 
 		*dotdot = 0;
 		next += symmetric;
 
+		at = strstr(arg, "@{");
+		if (at && !strchr(at + 2, '}')) {
+			struct strbuf buf;
+			strcpy(dotdot, "}");
+			strbuf_init(&buf, 0);
+			strbuf_insert(&buf, 0, arg, at + 2 - arg);
+			if (!strcmp(next, "}"))
+				strbuf_addch(&buf, '0');
+			strbuf_addstr(&buf, next);
+			/* we will not free() this buffer */
+			next = buf.buf;
+		}
+
 		if (!*next)
 			next = "HEAD";
 		if (dotdot == arg)
-- 
1.5.4.rc2.5.g44b6d-dirty

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