git-completion.bash: rename to $__git_cmd_idx

In e94fb44042 (git-completion.bash: pass $__git_subcommand_idx from
__git_main(), 2021-03-24), the $__git_subcommand_idx variable was
introduced. Naming it after the index of the subcommand is needlessly
confusing as, when this variable is used, it is in the completion
functions for commands (e.g. _git_remote()) where for `git remote add`,
the `remote` is referred to as the command and `add` is referred to as
the subcommand.

Rename this variable so that it's obvious it's about git commands. While
we're at it, shorten up its name so that it's still readable without
being a handful to type.

Signed-off-by: Denton Liu <liu.denton@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/completion/git-completion.bash

@@ -1474,12 +1474,12 @@ _git_branch ()
 
 _git_bundle ()
 {
-	local cmd="${words[__git_subcommand_idx+1]}"
+	local cmd="${words[__git_cmd_idx+1]}"
 	case "$cword" in
-	$((__git_subcommand_idx+1)))
+	$((__git_cmd_idx+1)))
 		__gitcomp "create list-heads verify unbundle"
 		;;
-	$((__git_subcommand_idx+2)))
+	$((__git_cmd_idx+2)))
 		# looking for a file
 		;;
 	*)
@@ -1894,7 +1894,7 @@ _git_grep ()
 	esac
 
 	case "$cword,$prev" in
-	$((__git_subcommand_idx+1)),*|*,-*)
+	$((__git_cmd_idx+1)),*|*,-*)
 		__git_complete_symbol && return
 		;;
 	esac
@@ -3017,7 +3017,7 @@ _git_stash ()
 	local subcommand="$(__git_find_on_cmdline "$subcommands save")"
 
 	if [ -z "$subcommand" ]; then
-		case "$((cword - __git_subcommand_idx)),$cur" in
+		case "$((cword - __git_cmd_idx)),$cur" in
 		*,--*)
 			__gitcomp_builtin stash_push
 			;;
@@ -3058,7 +3058,7 @@ _git_stash ()
 		__gitcomp_builtin stash_branch
 		;;
 	branch,*)
-		if [ $cword -eq $((__git_subcommand_idx+2)) ]; then
+		if [ $cword -eq $((__git_cmd_idx+2)) ]; then
 			__git_complete_refs
 		else
 			__gitcomp_nl "$(__git stash list \
@@ -3303,7 +3303,7 @@ _git_worktree ()
 			# 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 $((__git_subcommand_idx+2)) ]; then
+			if [ $cword -eq $((__git_cmd_idx+2)) ]; then
 				# Right after the 'add' subcommand: have to
 				# complete the path, so fall back to Bash
 				# filename completion.
@@ -3327,7 +3327,7 @@ _git_worktree ()
 		__git_complete_worktree_paths
 		;;
 	move,*)
-		if [ $cword -eq $((__git_subcommand_idx+2)) ]; then
+		if [ $cword -eq $((__git_cmd_idx+2)) ]; then
 			# The first parameter must be an existing working
 			# tree to be moved.
 			__git_complete_worktree_paths
@@ -3395,7 +3395,7 @@ __git_main ()
 {
 	local i c=1 command __git_dir __git_repo_path
 	local __git_C_args C_args_count=0
-	local __git_subcommand_idx
+	local __git_cmd_idx
 
 	while [ $c -lt $cword ]; do
 		i="${words[c]}"
@@ -3426,7 +3426,7 @@ __git_main ()
 			;;
 		*)
 			command="$i"
-			__git_subcommand_idx="$c"
+			__git_cmd_idx="$c"
 			break
 			;;
 		esac