git-grep: document --and, --or, --not, ( and )

[jc: added an example section.]

Signed-off-by: Matthias Lederhofer <matled@gmx.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

diff --git a/Documentation/git-grep.txt b/Documentation/git-grep.txt
index 62a8e7f222d480046beee5cf735fa92821e26f8d..dc7683383c3b4dc4c6bede834155ae56132aafc3 100644 (file)
--- a/Documentation/git-grep.txt
+++ b/Documentation/git-grep.txt
@@ -16,7 +16,7 @@ SYNOPSIS
           [-n] [-l | --files-with-matches] [-L | --files-without-match]
           [-c | --count]
           [-A <post-context>] [-B <pre-context>] [-C <context>]
-          [-f <file>] [-e] <pattern>
+          [-f <file>] [-e] <pattern> [--and|--or|--not|(|)|-e <pattern>...]
           [<tree>...]
           [--] [<path>...]
 
@@ -74,16 +74,30 @@ OPTIONS
 -e::
        The next parameter is the pattern. This option has to be
        used for patterns starting with - and should be used in
-       scripts passing user input to grep.
+       scripts passing user input to grep.  Multiple patterns are
+       combined by 'or'.
+
+--and | --or | --not | ( | )::
+       Specify how multiple patterns are combined using boolean
+       expressions.  `--or` is the default operator.  `--and` has
+       higher precedence than `--or`.  `-e` has to be used for all
+       patterns.
 
 `<tree>...`::
        Search blobs in the trees for specified patterns.
 
-`--`::
+\--::
        Signals the end of options; the rest of the parameters
        are <path> limiters.
 
 
+Example
+-------
+
+git grep -e \'#define\' --and \( -e MAX_PATH -e PATH_MAX \)::
+       Looks for a line that has `#define` and either `MAX_PATH` or
+       `PATH_MAX`.
+
 Author
 ------
 Originally written by Linus Torvalds <torvalds@osdl.org>, later