[lorenzolfm]

wt delete took one worktree. It now takes several: wt d a b c.

• The command finds each name before it removes anything, so a name that is wrong changes nothing. The error gives each name that is wrong, so the user can correct the list in one step.
• Git can refuse a worktree that has a modified or untracked file. The command then keeps that worktree, removes the others and fails at the end with the names that it kept. --force applies to each worktree.
• The message for a refusal says "use --force to remove it", or "them" for more than one worktree. With --force it gives no hint, because git refused for a different reason, for example a lock.
• A worktree that has two names in the list, its directory and its path, is removed one time.

The fish completion already offers the worktrees for each argument after wt d. Only its description changes.

The git helper for the test fixtures moves from the tests of wt add to src/testing.rs, so the tests of wt add and wt delete share it.

Test

Format check, clippy and cargo test pass. Three new tests run wt delete in a temporary repository:

• A list with two wrong names gives both names, and no worktree is removed.
• A worktree with its directory and its path in the list is removed one time.
• A worktree with an untracked file is kept, and the worktrees before and after it are removed.

Each test fails when the behavior that it protects is removed from the code.

A manual test in a temporary repository with the worktrees a b c d and an untracked file in c:

Command	Result
wt d a typo b	Error with the list of names. Nothing removed.
wt d typo a other	Error that gives typo and other. Nothing removed.
wt d a b c a	a and b removed. c kept, exit 1.
wt d c d --force	c and d removed.
wt d	Usage error.

With a locked worktree l, wt d l d --force removes d, keeps l and fails with wt cannot remove l, with no hint to use --force.