'git worktree list' uses the for_each_worktree function to iterate,
and outputs the worktree dir.  With the verbose option set, it also
shows the branch or revision currently checked out in that worktree.

Signed-off-by: Michael Rappazzo <rappa...@gmail.com>
---
 Documentation/git-worktree.txt |  10 ++++-
 builtin/worktree.c             |  42 +++++++++++++++++
 t/t2027-worktree-list.sh       | 100 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 150 insertions(+), 2 deletions(-)
 create mode 100755 t/t2027-worktree-list.sh

diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
index fb68156..867a24a 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' [-v|--verbose]
 
 DESCRIPTION
 -----------
@@ -59,6 +60,10 @@ prune::
 
 Prune working tree information in $GIT_DIR/worktrees.
 
+list::
+
+List the main worktree followed by all of the linked worktrees.
+
 OPTIONS
 -------
 
@@ -88,11 +93,13 @@ OPTIONS
 
 -v::
 --verbose::
-       With `prune`, report all removals.
+       With `prune`, report all removals.  
+       With `list` show the branch or revision currently checked out in that 
worktree.
 
 --expire <time>::
        With `prune`, only expire unused working trees older than <time>.
 
+
 DETAILS
 -------
 Each linked working tree has a private sub-directory in the repository's
@@ -167,7 +174,6 @@ performed manually, such as:
 - `remove` to remove a linked working tree and its administrative files (and
   warn if the working tree is dirty)
 - `mv` to move or rename a working tree and update its administrative files
-- `list` to list linked working trees
 - `lock` to prevent automatic pruning of administrative files (for instance,
   for a working tree on a portable device)
 
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 7b3cb96..6d96cdf 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -12,6 +12,7 @@
 static const char * const worktree_usage[] = {
        N_("git worktree add [<options>] <path> <branch>"),
        N_("git worktree prune [<options>]"),
+       N_("git worktree list [<options>]"),
        NULL
 };
 
@@ -442,6 +443,45 @@ done:
        return ret;
 }
 
+static int print_worktree_details(const char *path, const char *git_dir, void 
*cb_data)
+{
+       printf("%s", path);
+
+       if (verbose) {
+               enter_repo(git_dir, 1);
+               printf("  [");
+               unsigned char sha1[20];
+               int flag;
+
+               const char *refname = resolve_ref_unsafe("HEAD", 0, sha1, 
&flag);
+               if (!(flag & REF_ISSYMREF)) {
+                       printf("%s", find_unique_abbrev(sha1, DEFAULT_ABBREV));
+               } else {
+                       refname = shorten_unambiguous_ref(refname, 0);
+                       printf("%s", refname);
+               }
+
+               printf("]");
+       }
+       printf("\n");
+
+       return 0;
+}
+
+static int list(int ac, const char **av, const char *prefix)
+{
+       struct option options[] = {
+               OPT__VERBOSE(&verbose, N_("show the branch or revision 
currently checked out")),
+               OPT_END()
+       };
+
+       ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
+       if (ac)
+               usage_with_options(worktree_usage, options);
+
+       return for_each_worktree(&print_worktree_details, NULL);
+}
+
 int cmd_worktree(int ac, const char **av, const char *prefix)
 {
        struct option options[] = {
@@ -454,5 +494,7 @@ 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..85bd243
--- /dev/null
+++ b/t/t2027-worktree-list.sh
@@ -0,0 +1,100 @@
+#!/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 main' '
+       git rev-parse --show-toplevel >expect &&
+       git worktree add --detach here master &&
+       git -C here rev-parse --show-toplevel >>expect &&
+       git worktree list >actual &&
+       test_cmp expect actual &&
+       rm -rf here &&
+       git worktree prune
+'
+
+test_expect_success '"list" all worktrees from linked' '
+       git rev-parse --show-toplevel >expect &&
+       git worktree add --detach here master &&
+       git -C here rev-parse --show-toplevel >>expect &&
+       git -C here worktree list >actual &&
+       test_cmp expect actual &&
+       rm -rf here &&
+       git worktree prune
+'
+
+test_expect_success '"list" all worktrees --verbose from main' '
+       echo "$(git rev-parse --show-toplevel)  [$(git symbolic-ref --short 
HEAD)]" >expect &&
+       git worktree add --detach here master &&
+       echo "$(git -C here rev-parse --show-toplevel)  [$(git -C here 
rev-parse --short HEAD)]" >>expect &&
+       git worktree list --verbose >actual &&
+       test_cmp expect actual &&
+       rm -rf here &&
+       git worktree prune
+'
+
+test_expect_success '"list" all worktrees --verbose from linked' '
+       echo "$(git rev-parse --show-toplevel)  [$(git symbolic-ref --short 
HEAD)]" >expect &&
+       git worktree add --detach here master &&
+       echo "$(git -C here rev-parse --show-toplevel)  [$(git -C here 
rev-parse --short HEAD)]" >>expect &&
+       git -C here worktree list --verbose >actual &&
+       test_cmp expect actual &&
+       rm -rf here &&
+       git worktree prune
+'
+
+test_expect_success 'bare repo setup' '
+       git init --bare bare1 &&
+       echo "data" > file1 &&
+       git add file1 &&
+       git commit -m"File1: add data" &&
+       git push bare1 master &&
+       git reset --hard HEAD^
+'
+
+test_expect_success '"list" all worktrees from bare main' '
+       git -C bare1 worktree add --detach ../there master &&
+       echo "$(git -C there rev-parse --show-toplevel)" >expect &&
+       git -C bare1 worktree list >actual &&
+       test_cmp expect actual &&
+       rm -rf there &&
+       git -C bare1 worktree prune
+'
+
+test_expect_success '"list" all worktrees from worktree with a bare main' '
+       git -C bare1 worktree add --detach ../there master &&
+       echo "$(git -C there rev-parse --show-toplevel)" >expect &&
+       git -C there worktree list >actual &&
+       test_cmp expect actual &&
+       rm -rf there &&
+       git -C bare1 worktree prune
+'
+
+test_expect_success '"list" all worktrees --verbose from bare main' '
+       git -C bare1 worktree add --detach ../there master &&
+       echo "$(git -C there rev-parse --show-toplevel)  [$(git -C there 
rev-parse --short HEAD)]" >expect &&
+       git -C bare1 worktree list --verbose >actual &&
+       test_cmp expect actual &&
+       rm -rf there &&
+       git -C bare1 worktree prune
+'
+
+test_expect_success '"list" all worktrees --verbose from worktree with a bare 
main' '
+       git -C bare1 worktree add --detach ../there master &&
+       echo "$(git -C there rev-parse --show-toplevel)  [$(git -C there 
rev-parse --short HEAD)]" >expect &&
+       git -C there worktree list --verbose >actual &&
+       test_cmp expect actual &&
+       rm -rf there &&
+       git -C bare1 worktree prune
+'
+
+test_expect_success 'bare repo cleanup' '
+       rm -rf bare1
+'
+
+test_done
-- 
2.5.0

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