Signed-off-by: Nguyễn Thái Ngọc Duy <pclo...@gmail.com>
---
 Documentation/git-worktree.txt         | 22 +++++----
 builtin/worktree.c                     | 81 ++++++++++++++++++++++++++++++++++
 contrib/completion/git-completion.bash |  5 ++-
 t/t2028-worktree-move.sh               | 26 +++++++++++
 4 files changed, 124 insertions(+), 10 deletions(-)

diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
index a302f0a..60ad465 100644
--- a/Documentation/git-worktree.txt
+++ b/Documentation/git-worktree.txt
@@ -14,6 +14,7 @@ SYNOPSIS
 'git worktree lock' [--reason <string>] <path>
 'git worktree move' <path> <new-path>
 'git worktree prune' [-n] [-v] [--expire <expire>]
+'git worktree remove' [--force] <path>
 'git worktree unlock' <path>
 
 DESCRIPTION
@@ -78,6 +79,14 @@ prune::
 
 Prune working tree information in $GIT_DIR/worktrees.
 
+remove::
+
+Remove a worktree. Only clean worktrees, no untracked files and no
+modification in tracked files, can be removed. Unclean worktrees can
+be removed with `--force`. Main worktree cannot be removed. It needs
+to be converted to a linked worktree first by moving the repository
+away.
+
 unlock::
 
 Unlock a worktree, allowing it to be pruned, moved or deleted.
@@ -87,9 +96,10 @@ OPTIONS
 
 -f::
 --force::
-       By default, `add` refuses to create a new working tree when `<branch>`
-       is already checked out by another working tree. This option overrides
-       that safeguard.
+       By default, `add` refuses to create a new working tree when
+       `<branch>` is already checked out by another working tree and
+       `remove` refuses to remove an unclean worktree. This option
+       overrides that safeguard.
 
 -b <new-branch>::
 -B <new-branch>::
@@ -234,12 +244,6 @@ Multiple checkout in general is still experimental, and 
the support
 for submodules is incomplete. It is NOT recommended to make multiple
 checkouts of a superproject.
 
-git-worktree could provide more automation for tasks currently
-performed manually, such as:
-
-- `remove` to remove a linked working tree and its administrative files (and
-  warn if the working tree is dirty)
-
 GIT
 ---
 Part of the linkgit:git[1] suite
diff --git a/builtin/worktree.c b/builtin/worktree.c
index 5402a4e..084f8fd 100644
--- a/builtin/worktree.c
+++ b/builtin/worktree.c
@@ -17,6 +17,7 @@ static const char * const worktree_usage[] = {
        N_("git worktree lock [<options>] <path>"),
        N_("git worktree move <path> <new-path>"),
        N_("git worktree prune [<options>]"),
+       N_("git worktree remove [<options>] <path>"),
        N_("git worktree unlock <path>"),
        NULL
 };
@@ -595,6 +596,84 @@ static int move_worktree(int ac, const char **av, const 
char *prefix)
        return update_worktree_location(wt, dst.buf);
 }
 
+static int remove_worktree(int ac, const char **av, const char *prefix)
+{
+       int force = 0;
+       struct option options[] = {
+               OPT_BOOL(0, "force", &force,
+                        N_("force removing even if the worktree is dirty")),
+               OPT_END()
+       };
+       struct worktree **worktrees, *wt;
+       struct strbuf dst = STRBUF_INIT;
+       const char *reason;
+       int ret = 0;
+
+       ac = parse_options(ac, av, prefix, options, worktree_usage, 0);
+       if (ac != 1)
+               usage_with_options(worktree_usage, options);
+
+       strbuf_addstr(&dst, prefix_filename(prefix,
+                                           strlen(prefix),
+                                           av[0]));
+
+       worktrees = get_worktrees();
+       wt = find_worktree_by_path(worktrees, dst.buf);
+       if (!wt)
+               die(_("'%s' is not a working directory"), av[0]);
+       if (is_main_worktree(wt))
+               die(_("'%s' is a main working directory"), av[0]);
+       if ((reason = is_worktree_locked(wt))) {
+               if (*reason)
+                       die(_("already locked, reason: %s"), reason);
+               die(_("already locked, no reason"));
+       }
+       if (validate_worktree(wt, 0))
+               return -1;
+
+       if (!force) {
+               struct argv_array child_env = ARGV_ARRAY_INIT;
+               struct child_process cp;
+               char buf[1];
+
+               argv_array_pushf(&child_env, "%s=%s/.git",
+                                GIT_DIR_ENVIRONMENT, wt->path);
+               argv_array_pushf(&child_env, "%s=%s",
+                                GIT_WORK_TREE_ENVIRONMENT, wt->path);
+               memset(&cp, 0, sizeof(cp));
+               argv_array_pushl(&cp.args, "status", "--porcelain", NULL);
+               cp.env = child_env.argv;
+               cp.git_cmd = 1;
+               cp.dir = wt->path;
+               cp.out = -1;
+               ret = start_command(&cp);
+               if (ret)
+                       die_errno(_("failed to run git-status on '%s', code 
%d"),
+                                 av[0], ret);
+               ret = xread(cp.out, buf, sizeof(buf));
+               if (ret)
+                       die(_("'%s' is dirty, use --force to delete it"), 
av[0]);
+               close(cp.out);
+               ret = finish_command(&cp);
+               if (ret)
+                       die_errno(_("failed to run git-status on '%s', code 
%d"),
+                                 av[0], ret);
+       }
+       if (remove_dir_recursively(&dst, 0)) {
+               sys_error(_("failed to delete '%s'"), wt->path);
+               ret = -1;
+       }
+       strbuf_reset(&dst);
+       strbuf_addstr(&dst, git_common_path("worktrees/%s", wt->id));
+       if (remove_dir_recursively(&dst, 0)) {
+               sys_error(_("failed to delete '%s'"), dst.buf);
+               ret = -1;
+       }
+       strbuf_release(&dst);
+       free_worktrees(worktrees);
+       return ret;
+}
+
 int cmd_worktree(int ac, const char **av, const char *prefix)
 {
        struct option options[] = {
@@ -617,5 +696,7 @@ int cmd_worktree(int ac, const char **av, const char 
*prefix)
                return unlock_worktree(ac - 1, av + 1, prefix);
        if (!strcmp(av[1], "move"))
                return move_worktree(ac - 1, av + 1, prefix);
+       if (!strcmp(av[1], "remove"))
+               return remove_worktree(ac - 1, av + 1, prefix);
        usage_with_options(worktree_usage, options);
 }
diff --git a/contrib/completion/git-completion.bash 
b/contrib/completion/git-completion.bash
index 022d990..6fb45ea 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2596,7 +2596,7 @@ _git_whatchanged ()
 
 _git_worktree ()
 {
-       local subcommands="add list lock move prune unlock"
+       local subcommands="add list lock move prune remove unlock"
        local subcommand="$(__git_find_on_cmdline "$subcommands")"
        if [ -z "$subcommand" ]; then
                __gitcomp "$subcommands"
@@ -2614,6 +2614,9 @@ _git_worktree ()
                prune,--*)
                        __gitcomp "--dry-run --expire --verbose"
                        ;;
+               remove,--*)
+                       __gitcomp "--force"
+                       ;;
                *)
                        ;;
                esac
diff --git a/t/t2028-worktree-move.sh b/t/t2028-worktree-move.sh
index 83fbab5..668ee05 100755
--- a/t/t2028-worktree-move.sh
+++ b/t/t2028-worktree-move.sh
@@ -74,4 +74,30 @@ test_expect_success 'move main worktree' '
        test_must_fail git worktree move . def
 '
 
+test_expect_success 'remove main worktree' '
+       test_must_fail git worktree remove .
+'
+
+test_expect_success 'remove locked worktree' '
+       git worktree lock destination &&
+       test_must_fail git worktree remove destination &&
+       git worktree unlock destination
+'
+
+test_expect_success 'remove worktree with dirty tracked file' '
+       echo dirty >>destination/init.t &&
+       test_must_fail git worktree remove destination
+'
+
+test_expect_success 'remove worktree with untracked file' '
+       git -C destination checkout init.t &&
+       : >destination/untracked &&
+       test_must_fail git worktree remove destination
+'
+
+test_expect_success 'force remove worktree with untracked file' '
+       git worktree remove --force destination &&
+       test_path_is_missing destination
+'
+
 test_done
-- 
2.8.0.rc0.210.gd302cd2

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