worktree: teach `list` verbose mode

"git worktree list" annotates each worktree according to its state such
as "prunable" or "locked", however it is not immediately obvious why
these worktrees are being annotated. For prunable worktrees a reason
is available that is returned by should_prune_worktree() and for locked
worktrees a reason might be available provided by the user via `lock`
command.

Let's teach "git worktree list" a --verbose mode that outputs the reason
why the worktrees are being annotated. The reason is a text that can take
virtually any size and appending the text on the default columned format
will make it difficult to extend the command with other annotations and
not fit nicely on the screen. In order to address this shortcoming the
annotation is then moved to the next line indented followed by the reason
If the reason is not available the annotation stays on the same line as
the worktree itself.

The output of "git worktree list" with verbose becomes like so:

    $ git worktree list --verbose
    ...
    /path/to/locked-no-reason    acb124 [branch-a] locked
    /path/to/locked-with-reason  acc125 [branch-b]
        locked: worktree with a locked reason
    /path/to/prunable-reason     ace127 [branch-d]
        prunable: gitdir file points to non-existent location
    ...

Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Rafael Silva <rafaeloliveira.cs@gmail.com>
Reviewed-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 20 insertions, 0 deletions

diff --git a/Documentation/git-worktree.txt b/Documentation/git-worktree.txt
index 240c3fd76b..f1bb1fa5f5 100644
--- a/Documentation/git-worktree.txt
+++ b/Documentation/git-worktree.txt
@@ -232,6 +232,8 @@ This can also be set up as the default behaviour by using the
 -v::
 --verbose::
 	With `prune`, report all removals.
++
+With `list`, output additional information about worktrees (see below).
 
 --expire <time>::
 	With `prune`, only expire unused working trees older than `<time>`.
@@ -389,6 +391,24 @@ $ git worktree list
 /path/to/prunable-worktree  5678abc  (detached HEAD) prunable
 ------------
 
+For these annotations, a reason might also be available and this can be
+seen using the verbose mode. The annotation is then moved to the next line
+indented followed by the additional information.
+
+------------
+$ git worktree list --verbose
+/path/to/linked-worktree              abcd1234 [master]
+/path/to/locked-worktree-no-reason    abcd5678 (detached HEAD) locked
+/path/to/locked-worktree-with-reason  1234abcd (brancha)
+	locked: working tree path is mounted on a portable device
+/path/to/prunable-worktree            5678abc1 (detached HEAD)
+	prunable: gitdir file points to non-existent location
+------------
+
+Note that the annotation is moved to the next line if the additional
+information is available, otherwise it stays on the same line as the
+working tree itself.
+
 Porcelain Format
 ~~~~~~~~~~~~~~~~
 The porcelain format has a line per attribute.  Attributes are listed with a