[PATCH v2 1/5] completion: reflog with implicit "show"

[Rubén Justo <rjusto@xxxxxxxxx>]

When no subcommand is specified to "reflog", we assume "show" [1]:

    $ git reflog -h
    usage: git reflog [show] [<log-options>] [<ref>]
    ...

This implicit "show" is not being completed correctly:

    $ git checkout -b default
    $ git reflog def<TAB><TAB>
    ... no completion options ...

The expected result is:

    $ git reflog default

This happens because we're completing references after seeing a valid
subcommand in the command line.  This prevents the implicit "show" from
working properly, but also introduces a new problem: it keeps offering
subcommand options when the subcommand is implicit:

    $ git checkout -b explore
    $ git reflog default ex<TAB>
    ...
    $ git reflog default expire

The expected result is:

    $ git reflog default explore

To fix this, complete references even if no subcommand is present, or in
other words when the subcommand is implicit "show".

Also, only include completion options for subcommands when completing
the right position in the command line.

  1. cf39f54efc (git reflog show, 2007-02-08)

Signed-off-by: Rubén Justo <rjusto@xxxxxxxxx>
---
 contrib/completion/git-completion.bash |  9 ++++-----
 t/t9902-completion.sh                  | 11 +++++++++++
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 8c40ade494..ff216f1c65 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -2407,12 +2407,11 @@ _git_rebase ()
 _git_reflog ()
 {
 	local subcommands="show delete expire"
-	local subcommand="$(__git_find_on_cmdline "$subcommands")"
 
-	if [ -z "$subcommand" ]; then
-		__gitcomp "$subcommands"
-	else
-		__git_complete_refs
+	__git_complete_refs
+
+	if [ $((cword - __git_cmd_idx)) -eq 1 ]; then
+		__gitcompappend "$subcommands" "" "$cur" " "
 	fi
 }
 
diff --git a/t/t9902-completion.sh b/t/t9902-completion.sh
index aa9a614de3..dbd57e6a28 100755
--- a/t/t9902-completion.sh
+++ b/t/t9902-completion.sh
@@ -2618,6 +2618,17 @@ test_expect_success 'git clone --config= - value' '
 	EOF
 '
 
+test_expect_success 'git reflog show' '
+	test_when_finished "git checkout - && git branch -d shown" &&
+	git checkout -b shown &&
+	test_completion "git reflog sho" <<-\EOF &&
+	show Z
+	shown Z
+	EOF
+	test_completion "git reflog show sho" "shown " &&
+	test_completion "git reflog shown sho" "shown "
+'
+
 test_expect_success 'options with value' '
 	test_completion "git merge -X diff-algorithm=" <<-\EOF
 
-- 
2.44.0