Add the '--contains' option provided by 'ref-filter'. The '--contains'
lists only refs which are contain the specific commit (HEAD of the
branch if no commit give).

Add documentation for the same.

Mentored-by: Christian Couder <christian.cou...@gmail.com>
Mentored-by: Matthieu Moy <matthieu....@grenoble-inp.fr>
Signed-off-by: Karthik Nayak <karthik....@gmail.com>
---
 Documentation/git-for-each-ref.txt | 5 +++++
 builtin/for-each-ref.c             | 2 ++
 2 files changed, 7 insertions(+)

diff --git a/Documentation/git-for-each-ref.txt 
b/Documentation/git-for-each-ref.txt
index 74f24f4..7ac64ea 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -11,6 +11,7 @@ SYNOPSIS
 'git for-each-ref' [--count=<count>] [--shell|--perl|--python|--tcl]
                   [(--sort=<key>)...] [--format=<format>] [<pattern>...]
                   [--points-at <object>] [(--merged | --no-merged) <object>]
+                  [--contains <object>]
 
 DESCRIPTION
 -----------
@@ -74,6 +75,10 @@ OPTIONS
        Only list refs whose tips are not reachable from the
        specified commit (HEAD if not specified).
 
+--contains [<commit>]::
+       Only list tags which contain the specified commit (HEAD if not
+       specified).
+
 FIELD NAMES
 -----------
 
diff --git a/builtin/for-each-ref.c b/builtin/for-each-ref.c
index 82605ed..44e1467 100644
--- a/builtin/for-each-ref.c
+++ b/builtin/for-each-ref.c
@@ -9,6 +9,7 @@ static char const * const for_each_ref_usage[] = {
        N_("git for-each-ref [<options>] [<pattern>]"),
        N_("git for-each-ref [--points-at <object>]"),
        N_("git for-each-ref [(--merged | --no-merged) <object>]"),
+       N_("git for-each-ref [--contains <object>]"),
        NULL
 };
 
@@ -41,6 +42,7 @@ int cmd_for_each_ref(int argc, const char **argv, const char 
*prefix)
                             parse_opt_points_at),
                OPT_MERGED(&ref_cbdata.filter, N_("print only merged refs")),
                OPT_NO_MERGED(&ref_cbdata.filter, N_("print only not merged 
refs")),
+               OPT_CONTAINS(&ref_cbdata.filter.with_commit, N_("print only 
refs which contain the commit")),
                OPT_END(),
        };
 
-- 
2.4.2

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