'git worktree list' will list the main worktree followed by any linked
worktrees which were created using 'git worktree add'.  The option
'--main-only' will restrict the list to only the main worktree.
---
 Documentation/git-worktree.txt |  9 ++++-
 builtin/worktree.c             | 80 ++++++++++++++++++++++++++++++++++++++----
 t/t2027-worktree-list.sh       | 68 +++++++++++++++++++++++++++++++++++
 3 files changed, 150 insertions(+), 7 deletions(-)
 create mode 100755 t/t2027-worktree-list.sh

diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
index 3387e2f..39b1330 100644
--- a/Documentation/git-worktree.txt
+++ b/Documentation/git-worktree.txt
@@ -11,6 +11,7 @@ SYNOPSIS
 [verse]
 'git worktree add' [-f] [--detach] [-b <new-branch>] <path> [<branch>]
 'git worktree prune' [-n] [-v] [--expire <expire>]
+'git worktree list' [--primary]
 
 DESCRIPTION
 -----------
@@ -59,6 +60,10 @@ prune::
 
 Prune working tree information in $GIT_DIR/worktrees.
 
+list::
+
+List the primary worktree followed by all of the linked worktrees.
+
 OPTIONS
 -------
 
@@ -86,6 +91,9 @@ OPTIONS
        With `prune`, do not remove anything; just report what it would
        remove.
 
+--primary::
+       With `list`, only list the primary worktree.
+
 -v::
 --verbose::
        With `prune`, report all removals.
@@ -167,7 +175,6 @@ performed manually, such as:
 - `remove` to remove a linked worktree and its administrative files (and
   warn if the worktree is dirty)
 - `mv` to move or rename a worktree and update its administrative files
-- `list` to list linked worktrees
 - `lock` to prevent automatic pruning of administrative files (for instance,
   for a worktree on a portable device)
 
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 6a264ee..1ac1776 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -10,6 +10,7 @@
 static const char * const worktree_usage[] = {
        N_("git worktree add [<options>] <path> <branch>"),
        N_("git worktree prune [<options>]"),
+       N_("git worktree list [<options>]"),
        NULL
 };
 
@@ -36,7 +37,7 @@ static int prune_worktree(const char *id, struct strbuf 
*reason)
        fd = open(git_path("worktrees/%s/gitdir", id), O_RDONLY);
        if (fd < 0) {
                strbuf_addf(reason, _("Removing worktrees/%s: unable to read 
gitdir file (%s)"),
-                           id, strerror(errno));
+                                id, strerror(errno));
                return 1;
        }
        len = st.st_size;
@@ -59,7 +60,7 @@ static int prune_worktree(const char *id, struct strbuf 
*reason)
                 * accessed since?
                 */
                if (!stat(git_path("worktrees/%s/link", id), &st_link) &&
-                   st_link.st_nlink > 1)
+                        st_link.st_nlink > 1)
                        return 0;
                if (st.st_mtime <= expire) {
                        strbuf_addf(reason, _("Removing worktrees/%s: gitdir 
file points to non-existent location"), id);
@@ -187,7 +188,7 @@ static int add_worktree(const char *path, const char 
**child_argv)
 
        name = worktree_basename(path, &len);
        strbuf_addstr(&sb_repo,
-                     git_path("worktrees/%.*s", (int)(path + len - name), 
name));
+                               git_path("worktrees/%.*s", (int)(path + len - 
name), name));
        len = sb_repo.len;
        if (safe_create_leading_directories_const(sb_repo.buf))
                die_errno(_("could not create leading directories of '%s'"),
@@ -225,7 +226,7 @@ static int add_worktree(const char *path, const char 
**child_argv)
        strbuf_addf(&sb, "%s/gitdir", sb_repo.buf);
        write_file(sb.buf, 1, "%s\n", real_path(sb_git.buf));
        write_file(sb_git.buf, 1, "gitdir: %s/worktrees/%s\n",
-                  real_path(get_git_common_dir()), name);
+                       real_path(get_git_common_dir()), name);
        /*
         * This is to keep resolve_ref() happy. We need a valid HEAD
         * or is_git_directory() will reject the directory. Moreover, HEAD
@@ -280,9 +281,9 @@ static int add(int ac, const char **av, const char *prefix)
        struct option options[] = {
                OPT__FORCE(&force, N_("checkout <branch> even if already 
checked out in other worktree")),
                OPT_STRING('b', NULL, &new_branch, N_("branch"),
-                          N_("create a new branch")),
+                               N_("create a new branch")),
                OPT_STRING('B', NULL, &new_branch_force, N_("branch"),
-                          N_("create or reset a branch")),
+                               N_("create or reset a branch")),
                OPT_BOOL(0, "detach", &detach, N_("detach HEAD at named 
commit")),
                OPT_END()
        };
@@ -316,6 +317,71 @@ static int add(int ac, const char **av, const char *prefix)
        return add_worktree(path, cmd.argv);
 }
 
+static int list(int ac, const char **av, const char *prefix)
+{
+       int primary = 0;
+       struct option options[] = {
+               OPT_BOOL(0, "primary", &primary, N_("only list the primary 
worktree")),
+               OPT_END()
+       };
+
+       ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
+       if (ac)
+               usage_with_options(worktree_usage, options);
+
+       const char *work_tree;
+       work_tree = get_git_work_tree();
+       if (!work_tree)
+               die("This operation must be run in a work tree");
+
+       struct strbuf worktree_git_path = STRBUF_INIT;
+       strbuf_addf(&worktree_git_path, _("%s/.git"), work_tree);
+
+       struct strbuf primary_work_tree = STRBUF_INIT;
+       if (is_directory(worktree_git_path.buf)) {
+               /* This is the primary tree */
+               strbuf_addstr(&primary_work_tree, work_tree);
+       } else {
+               const char *git_dir = get_git_dir();
+               strbuf_addf(&primary_work_tree, "%.*s", (int)(strstr(git_dir, 
"/.git/") - git_dir), git_dir);
+       }
+       printf("%s\n", primary_work_tree.buf);
+
+       if (!primary) {
+               chdir( primary_work_tree.buf );
+               if ( is_directory(git_path("worktrees")) ) {
+                       DIR *dir = opendir( git_path("worktrees") );
+                       if (dir != NULL) {
+                       struct dirent *d;
+                               struct stat st;
+                               char *path;
+                               int fd, len;
+                               while ((d = readdir(dir)) != NULL) {
+                                       if (!strcmp(d->d_name, ".") || 
!strcmp(d->d_name, ".."))
+                                               continue;
+                                       if 
(stat(git_path("worktrees/%s/gitdir", d->d_name), &st))
+                                               continue;
+                                       fd = 
open(git_path("worktrees/%s/gitdir", d->d_name), O_RDONLY);
+                                       if (fd < 0)
+                                               continue;
+       
+                                       len = st.st_size;
+                                       path = xmalloc(len + 1);
+                                       read_in_full(fd, path, len);
+                                       close(fd);
+
+                                       printf("%.*s\n", (int)(strstr(path, 
"/.git") - path), path);
+                                       free(path);
+                               }
+                       }
+                       closedir(dir);
+               }
+       }
+       strbuf_release(&primary_work_tree);
+       strbuf_release(&worktree_git_path);
+       return 0;
+}
+
 int cmd_worktree(int ac, const char **av, const char *prefix)
 {
        struct option options[] = {
@@ -328,5 +394,7 @@ int cmd_worktree(int ac, const char **av, const char 
*prefix)
                return add(ac - 1, av + 1, prefix);
        if (!strcmp(av[1], "prune"))
                return prune(ac - 1, av + 1, prefix);
+       if (!strcmp(av[1], "list"))
+               return list(ac - 1, av + 1, prefix);
        usage_with_options(worktree_usage, options);
 }
diff --git a/t/t2027-worktree-list.sh b/t/t2027-worktree-list.sh
new file mode 100755
index 0000000..ff48d72
--- /dev/null
+++ b/t/t2027-worktree-list.sh
@@ -0,0 +1,68 @@
+#!/bin/sh
+
+test_description='test git worktree list'
+
+. ./test-lib.sh
+
+test_expect_success 'setup' '
+       test_commit init
+'
+
+
+test_expect_success '"list" all worktrees from primary' '
+       orig_path=$PWD &&
+       git rev-parse --show-toplevel >expect &&
+       git worktree add --detach here master &&
+       (
+               cd here &&
+               git rev-parse --show-toplevel >>"$orig_path/expect" &&
+               cd "$orig_path" &&
+               git worktree list >actual &&
+               test_cmp expect actual &&
+               rm -rf here &&
+               git worktree prune
+       )
+'
+test_expect_success '"list" all worktrees from linked' '
+       orig_path=$PWD &&
+       git rev-parse --show-toplevel >expect &&
+       git worktree add --detach here master &&
+       (
+               cd here &&
+               git rev-parse --show-toplevel >>"$orig_path/expect" &&
+               git worktree list >actual &&
+               test_cmp "$orig_path/expect" actual &&
+               cd "$orig_path" &&
+               rm -rf here &&
+               git worktree prune
+       )
+'
+
+test_expect_success '"list" main worktree from primary' '
+       orig_path=$PWD &&
+       git rev-parse --show-toplevel >expect &&
+       git worktree add --detach here master &&
+       (
+               cd here &&
+               cd "$orig_path" &&
+               git worktree list --primary >actual &&
+               test_cmp expect actual &&
+               rm -rf here &&
+               git worktree prune
+       )
+'
+test_expect_success '"list" main worktree from linked' '
+       orig_path=$PWD &&
+       git rev-parse --show-toplevel >expect &&
+       git worktree add --detach here master &&
+       (
+               cd here &&
+               git worktree list --primary >actual &&
+               test_cmp "$orig_path/expect" actual &&
+               cd "$orig_path" &&
+               rm -rf here &&
+               git worktree prune
+       )
+'
+
+test_done
-- 
2.5.0

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