[PATCH v2 1/3] completion: no-op refactoring of checkout completion

[Junio C Hamano <gitster@pobox.com>]

The 'git checkout' completion function punts very early when it sees
'--' on the command line, as it indicates that options or revisions
can no longer appear.  By returning early, it allows the default
Bash action (which completes files in '$PWD') to kick in.

In preparation for changing what happens in the next step when
option or revision completion yields no matching candidates, or when
'--' is present, reorganize the control flow to avoid this early
return, and add explicit returns to the option completion branches.

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 contrib/completion/git-completion.bash | 84 +++++++++++++-------------
 1 file changed, 43 insertions(+), 41 deletions(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index d35b4f3024..38dec1cabe 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -1735,49 +1735,51 @@ __git_checkout_default_dwim_mode ()
 
 _git_checkout ()
 {
-	__git_has_doubledash && return
-
-	local dwim_opt="$(__git_checkout_default_dwim_mode)"
-
-	case "$prev" in
-	-b|-B|--orphan)
-		# Complete local branches (and DWIM branch
-		# remote branch names) for an option argument
-		# specifying a new branch name. This is for
-		# convenience, assuming new branches are
-		# possibly based on pre-existing branch names.
-		__git_complete_refs $dwim_opt --mode="heads"
-		return
-		;;
-	*)
-		;;
-	esac
+	if ! __git_has_doubledash; then
+		local dwim_opt="$(__git_checkout_default_dwim_mode)"
 
-	case "$cur" in
-	--conflict=*)
-		__gitcomp "diff3 merge zdiff3" "" "${cur##--conflict=}"
-		;;
-	--*)
-		__gitcomp_builtin checkout
-		;;
-	*)
-		# At this point, we've already handled special completion for
-		# the arguments to -b/-B, and --orphan. There are 3 main
-		# things left we can possibly complete:
-		# 1) a start-point for -b/-B, -d/--detach, or --orphan
-		# 2) a remote head, for --track
-		# 3) an arbitrary reference, possibly including DWIM names
-		#
+		case "$prev" in
+		-b|-B|--orphan)
+			# Complete local branches (and DWIM branch
+			# remote branch names) for an option argument
+			# specifying a new branch name. This is for
+			# convenience, assuming new branches are
+			# possibly based on pre-existing branch names.
+			__git_complete_refs $dwim_opt --mode="heads"
+			return
+			;;
+		*)
+			;;
+		esac
 
-		if [ -n "$(__git_find_on_cmdline "-b -B -d --detach --orphan")" ]; then
-			__git_complete_refs --mode="refs"
-		elif [ -n "$(__git_find_on_cmdline "-t --track")" ]; then
-			__git_complete_refs --mode="remote-heads"
-		else
-			__git_complete_refs $dwim_opt --mode="refs"
-		fi
-		;;
-	esac
+		case "$cur" in
+		--conflict=*)
+			__gitcomp "diff3 merge zdiff3" "" "${cur##--conflict=}"
+			return
+			;;
+		--*)
+			__gitcomp_builtin checkout
+			return
+			;;
+		*)
+			# At this point, we've already handled special completion for
+			# the arguments to -b/-B, and --orphan. There are 3 main
+			# things left we can possibly complete:
+			# 1) a start-point for -b/-B, -d/--detach, or --orphan
+			# 2) a remote head, for --track
+			# 3) an arbitrary reference, possibly including DWIM names
+			#
+
+			if [ -n "$(__git_find_on_cmdline "-b -B -d --detach --orphan")" ]; then
+				__git_complete_refs --mode="refs"
+			elif [ -n "$(__git_find_on_cmdline "-t --track")" ]; then
+				__git_complete_refs --mode="remote-heads"
+			else
+				__git_complete_refs $dwim_opt --mode="refs"
+			fi
+			;;
+		esac
+	fi
 }
 
 __git_sequencer_inprogress_options="--continue --quit --abort --skip"
-- 
2.55.0-721-g26b8014fc4