user-manual: use pithier example commit

diff --git a/Documentation/git-rev-parse.txt b/Documentation/git-rev-parse.txt
index ed938aafb0f7043131489a79e197f1c266cf9607..7757abe62190a066b6ad8b57214b70ff3fa0f12a 100644 (file)
--- a/Documentation/git-rev-parse.txt
+++ b/Documentation/git-rev-parse.txt
@@ -152,6 +152,18 @@ blobs contained in a commit.
   used immediately following a ref name and the ref must have an
   existing log ($GIT_DIR/logs/<ref>).
 
+* A ref followed by the suffix '@' with an ordinal specification
+  enclosed in a brace pair (e.g. '\{1\}', '\{15\}') to specify
+  the n-th prior value of that ref.  For example 'master@\{1\}'
+  is the immediate prior value of 'master' while 'master@\{5\}'
+  is the 5th prior value of 'master'. This suffix may only be used
+  immediately following a ref name and the ref must have an existing
+  log ($GIT_DIR/logs/<ref>).
+
+* You can use the '@' construct with an empty ref part to get at a
+  reflog of the current branch. For example, if you are on the
+  branch 'blabla', then '@\{1\}' means the same as 'blabla@\{1\}'.
+
 * A suffix '{caret}' to a revision parameter means the first parent of
   that commit object.  '{caret}<n>' means the <n>th parent (i.e.
   'rev{caret}'
@@ -178,6 +190,13 @@ blobs contained in a commit.
   and dereference the tag recursively until a non-tag object is
   found.
 
+* A colon, followed by a slash, followed by a text: this names
+  a commit whose commit message starts with the specified text.
+  This name returns the youngest matching commit which is
+  reachable from any ref.  If the commit message starts with a
+  '!', you have to repeat that;  the special sequence ':/!',
+  followed by something else than '!' is reserved for now.
+
 * A suffix ':' followed by a path; this names the blob or tree
   at the given path in the tree-ish object named by the part
   before the colon.
@@ -236,17 +255,24 @@ reachable from `r1` from the set of commits reachable from
 A similar notation "`r1\...r2`" is called symmetric difference
 of `r1` and `r2` and is defined as
 "`r1 r2 --not $(git-merge-base --all r1 r2)`".
-It it the set of commits that are reachable from either one of
+It is the set of commits that are reachable from either one of
 `r1` or `r2` but not from both.
 
-Here are a few examples:
-
-   D                A B D
-   D F              A B C D F
-   ^A G                    B D
-   ^A F             B C F
-   G...I            C D F G I
-   ^B G I          C D F G I
+Two other shorthands for naming a set that is formed by a commit
+and its parent commits exists.  `r1{caret}@` notation means all
+parents of `r1`.  `r1{caret}!` includes commit `r1` but excludes
+its all parents.
+
+Here are a handful examples:
+
+   D                G H D
+   D F              G H I J D F
+   ^G D             H D
+   ^D B             E I J F B
+   B...C            G H D E B C
+   ^D B C           E I J F B C
+   C^@              I J F
+   F^! D            G H D F
 
 Author
 ------