git-branch: add support for --merged and --no-merged

These options filter the output from git branch to only include branches
whose tip is either merged or not merged into HEAD.

The use-case for these options is when working with integration of branches
from many remotes: `git branch --no-merged -a` will show a nice list of merge
candidates while `git branch --merged -a` will show the progress of your
integration work.

Also, a plain `git branch --merged` is a quick way to find local branches
which you might want to delete.

Signed-off-by: Lars Hjemli <hjemli@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/Documentation/git-branch.txt b/Documentation/git-branch.txt
index 6f07a17a2c310a67f23034c520ab10670407c006..95e9d0d0be39de4b57fab2a43985720ae0d1c216 100644 (file)
--- a/Documentation/git-branch.txt
+++ b/Documentation/git-branch.txt
@@ -8,7 +8,7 @@ git-branch - List, create, or delete branches
 SYNOPSIS
 --------
 [verse]
-'git-branch' [--color | --no-color] [-r | -a]
+'git-branch' [--color | --no-color] [-r | -a] [--merged | --no-merged]
           [-v [--abbrev=<length> | --no-abbrev]]
           [--contains <commit>]
 'git-branch' [--track | --no-track] [-l] [-f] <branchname> [<start-point>]
@@ -24,6 +24,8 @@ and option `-a` shows both.
 With `--contains <commit>`, shows only the branches that
 contains the named commit (in other words, the branches whose
 tip commits are descendant of the named commit).
+With `--merged`, only branches merged into HEAD will be listed, and
+with `--no-merged` only branches not merged into HEAD will be listed.
 
 In its second form, a new branch named <branchname> will be created.
 It will start out with a head equal to the one given as <start-point>.

diff --git a/builtin-branch.c b/builtin-branch.c
index 5bc4526f645d40a4a32c50240975ad26f49b8e3b..19c508a60827c9c7c744da995bf5737733864a76 100644 (file)
--- a/builtin-branch.c
+++ b/builtin-branch.c
@@ -15,7 +15,7 @@
 #include "branch.h"
 
 static const char * const builtin_branch_usage[] = {
-       "git-branch [options] [-r | -a]",
+       "git-branch [options] [-r | -a] [--merged | --no-merged]",
        "git-branch [options] [-l] [-f] <branchname> [<start-point>]",
        "git-branch [options] [-r] (-d | -D) <branchname>",
        "git-branch [options] (-m | -M) [<oldbranch>] <newbranch>",
@@ -46,6 +46,8 @@ enum color_branch {
        COLOR_BRANCH_CURRENT = 4,
 };
 
+static int mergefilter = -1;
+
 static int parse_branch_color_slot(const char *var, int ofs)
 {
        if (!strcasecmp(var+ofs, "plain"))
@@ -210,6 +212,7 @@ static int append_ref(const char *refname, const unsigned char *sha1, int flags,
        struct ref_item *newitem;
        int kind = REF_UNKNOWN_TYPE;
        int len;
+       static struct commit_list branch;
 
        /* Detect kind */
        if (!prefixcmp(refname, "refs/heads/")) {
@@ -231,6 +234,16 @@ static int append_ref(const char *refname, const unsigned char *sha1, int flags,
        if ((kind & ref_list->kinds) == 0)
                return 0;
 
+       if (mergefilter > -1) {
+               branch.item = lookup_commit_reference_gently(sha1, 1);
+               if (!branch.item)
+                       die("Unable to lookup tip of branch %s", refname);
+               if (mergefilter == 0 && has_commit(head_sha1, &branch))
+                       return 0;
+               if (mergefilter == 1 && !has_commit(head_sha1, &branch))
+                       return 0;
+       }
+
        /* Resize buffer */
        if (ref_list->index >= ref_list->alloc) {
                ref_list->alloc = alloc_nr(ref_list->alloc);
@@ -444,6 +457,7 @@ int cmd_branch(int argc, const char **argv, const char *prefix)
                OPT_BIT('M', NULL, &rename, "move/rename a branch, even if target exists", 2),
                OPT_BOOLEAN('l', NULL, &reflog, "create the branch's reflog"),
                OPT_BOOLEAN('f', NULL, &force_create, "force creation (when already exists)"),
+               OPT_SET_INT(0, "merged", &mergefilter, "list only merged branches", 1),
                OPT_END(),
        };