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[PATCH] _git: Support completion from outside of a worktree when --git-dir/--work-tree are specified on the command line

Revised version of workers/41523.
The original patch used ${(e)} but that would execute command substitutions in
cases such as «--git-dir=$(pwd)».  ${(Q)${~foo}} doesn't have that problem.

The problem it does have is that «--git-dir=$HOME/foo» doesn't expand $HOME.
A syntax that performs "safe" expansions — i.e., those that can be done without
running arbitrary code — would be useful, both in completion and in widgets
(e.g., z-sy-h would find that useful).

For 5.9.


(Someone ran into the problem and the fix on IRC.)

 Completion/Unix/Command/_git | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/Completion/Unix/Command/_git b/Completion/Unix/Command/_git
index 7f2c206c1..350414bd5 100644
--- a/Completion/Unix/Command/_git
+++ b/Completion/Unix/Command/_git
@@ -7077,21 +7077,22 @@ __git_files_relative () {
 (( $+functions[__git_files] )) ||
 __git_files () {
-  local compadd_opts opts tag description gitcdup gitprefix files expl
+  local compadd_opts opts tag description gittoplevel gitprefix files expl
   zparseopts -D -E -a compadd_opts V+: J+: 1 2 o+: n f x+: X+: M+: P: S: r: R: q F:
   zparseopts -D -E -a opts -- -cached -deleted -modified -others -ignored -unmerged -killed x+: --exclude+:
   tag=$1 description=$2; shift 2
-  gitcdup=$(_call_program gitcdup git rev-parse --show-cdup 2>/dev/null)
+  gittoplevel=$(_call_program toplevel git rev-parse --show-toplevel 2>/dev/null)
   __git_command_successful $pipestatus || return 1
+  [[ -n $gittoplevel ]] && gittoplevel+="/"
   gitprefix=$(_call_program gitprefix git rev-parse --show-prefix 2>/dev/null)
   __git_command_successful $pipestatus || return 1
   # TODO: --directory should probably be added to $opts when --others is given.
-  local pref=$gitcdup$gitprefix$PREFIX
+  local pref=$gittoplevel$gitprefix$PREFIX
   # First allow ls-files to pattern-match in case of remote repository
   files=(${(0)"$(_call_program files git ls-files -z --exclude-standard ${(q)opts} -- ${(q)${pref:+$pref\*}:-.} 2>/dev/null)"})
@@ -8133,7 +8134,8 @@ _git() {
-	(( $+opt_args[--git-dir] )) && local -x GIT_DIR=$opt_args[--git-dir]
+        (( $+opt_args[--git-dir] )) && local -x GIT_DIR=${(Q)${~opt_args[--git-dir]}}
+        (( $+opt_args[--work-tree] )) && local -x GIT_WORK_TREE=${(Q)${~opt_args[--work-tree]}}
 	if ! _call_function ret _git-$words[1]; then
 	  if [[ $words[1] = \!* ]]; then

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