[PATCH v2 2/6] doc/rev-list-options: explain "-g" output formats

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We document that asking for HEAD@{now} will switch the
output to show HEAD@{timestamp}, but not that specifying
`--date` has a similar effect, or that it can be overridden
with HEAD@{0}. Let's do so.

These rules come from 794151e (reflog-walk: always make
HEAD@{0} show indexed selectors, 2012-05-04), though that is
simply the culmination of years of these heuristics growing
organically.

Signed-off-by: Jeff King <peff@xxxxxxxx>
---
 Documentation/rev-list-options.txt | 23 +++++++++++++++++++----
 1 file changed, 19 insertions(+), 4 deletions(-)

diff --git a/Documentation/rev-list-options.txt b/Documentation/rev-list-options.txt
index 1b56253..5d1de06 100644
--- a/Documentation/rev-list-options.txt
+++ b/Documentation/rev-list-options.txt
@@ -252,10 +252,25 @@ list.
 +
 With `--pretty` format other than `oneline` (for obvious reasons),
 this causes the output to have two extra lines of information
-taken from the reflog.  By default, `ref@{Nth}` notation is
-used in the output.  When the starting commit is specified as
-`ref@{now}`, output also uses `ref@{timestamp}` notation
-instead.  Under `--pretty=oneline`, the commit message is
+taken from the reflog.  The reflog designator in the output may be shown
+as `ref@{Nth}` (where `Nth` is the reverse-chronological index in the
+reflog) or as `ref@{timestamp}` (with the timestamp for that entry),
+depending on a few rules:
++
+--
+1. If the starting point is specified as `ref@{Nth}`, show the index
+format.
++
+2. If the starting point was specified as `ref@{now}`, show the
+timestamp format.
++
+3. If neither was used, but `--date` was given on the command line, show
+the timestamp in the format requested by `--date`.
++
+4. Otherwise, show the index format.
+--
++
+Under `--pretty=oneline`, the commit message is
 prefixed with this information on the same line.
 This option cannot be combined with `--reverse`.
 See also linkgit:git-reflog[1].
-- 
2.9.2.512.gc1ef750

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