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[PATCH] completion: optionally disable checkout DWIM

When we complete branch names for "git checkout", we also
complete remote branch names that could trigger the DWIM
behavior. Depending on your workflow and project, this can
be either convenient or annoying.

For instance, my clone of gitster.git contains 74 local
"jk/*" branches, but origin contains another 147. When I
want to checkout a local branch but can't quite remember the
name, tab completion shows me 251 entries. And worse, for a
topic that has been picked up for pu, the upstream branch
name is likely to be similar to mine, leading to a high
probability that I pick the wrong one and accidentally
create a new branch.

This patch adds a way for the user to tell the completion
code not to include DWIM suggestions for checkout. This can
already be done by typing:

  git checkout --no-guess jk/<TAB>

but that's rather cumbersome. The downside, of course, is
that you no longer get completion support when you _do_ want
to invoke the DWIM behavior. But depending on your workflow,
that may not be a big loss (for instance, in git.git I am
much more likely to want to detach, so I'd type "git
checkout origin/jk/<TAB>" anyway).

Signed-off-by: Jeff King <peff@xxxxxxxx>
This is flexible enough for me, but it's possible somebody would want
this on a per-repo basis. I don't know that we want to read from `git
config`, though, because it's relatively expensive to do so. People who
want per-repo settings are probably better off with a hook that triggers
when they "cd" around, and sets up their preferences.

 contrib/completion/git-completion.bash | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/contrib/completion/git-completion.bash b/contrib/completion/git-completion.bash
index 1150164d5..f53b18fae 100644
--- a/contrib/completion/git-completion.bash
+++ b/contrib/completion/git-completion.bash
@@ -28,6 +28,14 @@
 # completion style.  For example '!f() { : git commit ; ... }; f' will
 # tell the completion to use commit completion.  This also works with aliases
 # of form "!sh -c '...'".  For example, "!sh -c ': git commit ; ... '".
+# You can set the following environment variables to influence the behavior of
+# the completion routines:
+#     When non-empty, do not include "DWIM" suggestions in git-checkout
+#     completion (e.g., completing "foo" when "origin/foo" exists).
 *:*) : great ;;
@@ -1248,7 +1256,8 @@ _git_checkout ()
 		# check if --track, --no-track, or --no-guess was specified
 		# if so, disable DWIM mode
 		local flags="--track --no-track --no-guess" track_opt="--track"
-		if [ -n "$(__git_find_on_cmdline "$flags")" ]; then
+		     -n "$(__git_find_on_cmdline "$flags")" ]; then
 		__git_complete_refs $track_opt