'git worktree list' iterates through the worktree list, and outputs
the worktree dir.  By default, only the worktree path is output.

Supported options include:
        --skip-bare: do not output bare worktrees
        --verbose: include the current head and ref (if applicable), also
                decorate bare worktrees

Signed-off-by: Michael Rappazzo <rappa...@gmail.com>
---
 Documentation/git-worktree.txt |  10 +++-
 builtin/worktree.c             |  63 +++++++++++++++++++++
 t/t2027-worktree-list.sh       | 122 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 194 insertions(+), 1 deletion(-)
 create mode 100755 t/t2027-worktree-list.sh

diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
index fb68156..b9339ed 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] [--skip-bare]
 
 DESCRIPTION
 -----------
@@ -59,6 +60,10 @@ prune::
 
 Prune working tree information in $GIT_DIR/worktrees.
 
+list::
+
+List the main worktree followed by each of the linked worktrees.
+
 OPTIONS
 -------
 
@@ -89,10 +94,14 @@ OPTIONS
 -v::
 --verbose::
        With `prune`, report all removals.
+       With `list`, show more information about each worktree.  This includes
+       if the worktree is bare, the revision currently checked out, and the
+       branch currently checked out (or 'detached HEAD' if none).
 
 --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 +176,6 @@ 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 71bb770..a0c0fe8 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -8,10 +8,13 @@
 #include "run-command.h"
 #include "sigchain.h"
 #include "refs.h"
+#include "utf8.h"
+#include "worktree.h"
 
 static const char * const worktree_usage[] = {
        N_("git worktree add [<options>] <path> <branch>"),
        N_("git worktree prune [<options>]"),
+       N_("git worktree list [<options>]"),
        NULL
 };
 
@@ -359,6 +362,64 @@ static int add(int ac, const char **av, const char *prefix)
        return add_worktree(path, branch, &opts);
 }
 
+static int list(int ac, const char **av, const char *prefix)
+{
+       int no_bare = 0;
+
+       struct option options[] = {
+               OPT_BOOL(0, "skip-bare", &no_bare,  N_("exclude bare worktrees 
from the list")),
+               OPT__VERBOSE(&verbose, N_("include more worktree details")),
+               OPT_END()
+       };
+
+       ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
+       if (ac)
+               usage_with_options(worktree_usage, options);
+       else {
+               struct worktree_list *worktree_list = get_worktree_list();
+               struct worktree_list *orig = worktree_list;
+               struct strbuf sb = STRBUF_INIT;
+               int path_maxlen = 0;
+
+               if (verbose) {
+                       while (worktree_list) {
+                               int cur_len = 
strlen(worktree_list->worktree->path);
+                               if (cur_len > path_maxlen)
+                                       path_maxlen = cur_len;
+                               worktree_list = worktree_list->next ? 
worktree_list->next : NULL;
+                       }
+                       worktree_list = orig;
+               }
+               while (worktree_list) {
+                       /* if this work tree is not bare OR if bare repos are 
to be shown (default) */
+                       if (!worktree_list->worktree->is_bare || !no_bare) {
+                               strbuf_reset(&sb);
+                               if (!verbose)
+                                       strbuf_addstr(&sb, 
worktree_list->worktree->path);
+                               else {
+                                       int cur_len = 
strlen(worktree_list->worktree->path);
+                                       int utf8_adj = cur_len - 
utf8_strwidth(worktree_list->worktree->path);
+                                       strbuf_addf(&sb, "%-*s ", 1 + 
path_maxlen + utf8_adj, worktree_list->worktree->path);
+                                       if (worktree_list->worktree->is_bare)
+                                               strbuf_addstr(&sb, "(bare)");
+                                       else {
+                                               strbuf_addf(&sb, "%s ", 
find_unique_abbrev(worktree_list->worktree->head_sha1, DEFAULT_ABBREV));
+                                               if 
(!worktree_list->worktree->is_detached)
+                                                       strbuf_addf(&sb, 
"[%s]", shorten_unambiguous_ref(worktree_list->worktree->head_ref, 0));
+                                               else
+                                                       strbuf_addstr(&sb, 
"(detached HEAD)");
+                                       }
+                               }
+                               printf("%s\n", sb.buf);
+                       }
+                       worktree_list = worktree_list->next ? 
worktree_list->next : NULL;
+               }
+               worktree_list_release(orig);
+               strbuf_release(&sb);
+       }
+       return 0;
+}
+
 int cmd_worktree(int ac, const char **av, const char *prefix)
 {
        struct option options[] = {
@@ -371,5 +432,7 @@ 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..246890c
--- /dev/null
+++ b/t/t2027-worktree-list.sh
@@ -0,0 +1,122 @@
+#!/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)       $(git rev-parse --short 
HEAD) [$(git symbolic-ref --short HEAD)]" >expect &&
+       git worktree add --detach here master &&
+   echo "$(git -C here rev-parse --show-toplevel)  $(git rev-parse --short 
HEAD) (detached HEAD)" >>expect &&
+       git worktree list --verbose >actual &&
+       test_cmp expect actual &&
+       rm -rf here &&
+       git worktree prune
+'
+
+test_expect_success '"list" all worktrees --verbose from linked' '
+       echo "$(git rev-parse --show-toplevel)       $(git rev-parse --short 
HEAD) [$(git symbolic-ref --short HEAD)]" >expect &&
+       git worktree add --detach here master &&
+   echo "$(git -C here rev-parse --show-toplevel)  $(git rev-parse --short 
HEAD) (detached HEAD)" >>expect &&
+       git -C here worktree list --verbose >actual &&
+       test_cmp expect actual &&
+       rm -rf here &&
+       git worktree prune
+'
+
+test_expect_success 'bare repo setup' '
+       git init --bare bare1 &&
+       echo "data" > file1 &&
+       git add file1 &&
+       git commit -m"File1: add data" &&
+       git push bare1 master &&
+       git reset --hard HEAD^
+'
+
+test_expect_success '"list" all worktrees from bare main' '
+       git -C bare1 worktree add --detach ../there master &&
+       echo "$(cd bare1 && pwd)" >expect &&
+       echo "$(git -C there rev-parse --show-toplevel)" >>expect &&
+       git -C bare1 worktree list >actual &&
+       test_cmp expect actual &&
+       rm -rf there &&
+       git -C bare1 worktree prune
+'
+
+test_expect_success '"list" all worktrees from bare main --skip-bare' '
+       git -C bare1 worktree add --detach ../there master &&
+       echo "$(git -C there rev-parse --show-toplevel)" >expect &&
+       git -C bare1 worktree list --skip-bare >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 "$(cd bare1 && pwd)" >expect &&
+       echo "$(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 from worktree with a bare main 
--skip-bare' '
+       git -C bare1 worktree add --detach ../there master &&
+       echo "$(git -C there rev-parse --show-toplevel)" >expect &&
+       git -C there worktree list --skip-bare >actual &&
+       test_cmp expect actual &&
+       rm -rf there &&
+       git -C bare1 worktree prune
+'
+
+test_expect_success '"list" all worktrees --verbose from bare main' '
+       git -C bare1 worktree add --detach ../there master &&
+   echo "$(cd bare1 && pwd)  (bare)" >expect &&
+   echo "$(git -C there rev-parse --show-toplevel)  $(git -C there rev-parse 
--short HEAD) (detached HEAD)" >>expect &&
+       git -C bare1 worktree list --verbose >actual &&
+       test_cmp expect actual &&
+       rm -rf there &&
+       git -C bare1 worktree prune
+'
+
+test_expect_success '"list" all worktrees --verbose from worktree with a bare 
main' '
+       git -C bare1 worktree add --detach ../there master &&
+   echo "$(cd bare1 && pwd)  (bare)" >expect &&
+   echo "$(git -C there rev-parse --show-toplevel)  $(git -C there rev-parse 
--short HEAD) (detached 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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