[PATCH 6/6] completion: list paths and refs for 'git worktree add'

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Complete paths after 'git worktree add <TAB>' and refs after 'git
worktree add -b <TAB>' and 'git worktree add some/dir <TAB>'.

Uncharacteristically for a Git command, 'git worktree add' takes a
mandatory path parameter before a commit-ish as its optional last
parameter.  In addition, it has both standalone --options and options
with a mandatory unstuck parameter ('-b <new-branch>').  Consequently,
trying to complete refs for that last optional commit-ish parameter
resulted in a more convoluted than usual completion function, but
hopefully all the included comments will make it not too hard to
digest.

Signed-off-by: SZEDER Gábor <szeder.dev@xxxxxxxxx>
---
 contrib/completion/git-completion.bash | 36 ++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 4eb13b06d6..4e5cad4966 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -3004,6 +3004,42 @@ _git_worktree ()
 	*,--*)
 		__gitcomp_builtin worktree_$subcommand
 		;;
+	add,*)	# usage: git worktree add [<options>] <path> [<commit-ish>]
+		# Here we are not completing an --option, it's either the
+		# path or a ref.
+		case "$prev" in
+		-b|-B)	# Complete refs for branch to be created/reseted.
+			__git_complete_refs
+			;;
+		-*)	# The previous word is an -o|--option without an
+			# unstuck argument: have to complete the path for
+			# the new worktree, so don't list anything, but let
+			# Bash fall back to filename completion.
+			;;
+		*)	# The previous word is not an --option, so it must
+			# be either the 'add' subcommand, the unstuck
+			# argument of an option (e.g. branch for -b|-B), or
+			# the path for the new worktree.
+			if [ $cword -eq $((subcommand_idx+1)) ]; then
+				# Right after the 'add' subcommand: have to
+				# complete the path, so fall back to Bash
+				# filename completion.
+				:
+			else
+				case "${words[cword-2]}" in
+				-b|-B)	# After '-b <branch>': have to
+					# complete the path, so fall back
+					# to Bash filename completion.
+					;;
+				*)	# After the path: have to complete
+					# the ref to be checked out.
+					__git_complete_refs
+					;;
+				esac
+			fi
+			;;
+		esac
+		;;
 	lock,*|remove,*|unlock,*)
 		__git_complete_worktree_paths
 		;;
-- 
2.23.0.1084.gae250eaa40




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