Re: [PATCH] _pick_variant: Update builtin check

[Matthew Martin <phy1729@gmail.com>]

On Thu, Mar 21, 2019 at 07:57:38AM -0400, Daniel Shahaf wrote:
> I understand what you mean in the context of this thread, but I think
> the two uses of the term 'command' might be confusing to someone who
> opens the file in a year or three.  How about:
> 
> # Precommands which allow their wrapped command to be a builtin.
> # All of these are necessarily builtins or reserved words themselves, but not all builtin precommands are listed here: for one, the 'command' builtin is excluded.

Works for me. Unless there are other comments I'll commit later today.

- Matthew Martin

From 06741ae0671c4a29d2700afa46470a8024ddbefb Mon Sep 17 00:00:00 2001
From: Matthew Martin <phy1729@gmail.com>
Date: Tue, 19 Mar 2019 20:42:35 -0500
Subject: [PATCH] _pick_variant: Update builtin check

---
 Completion/Base/Utility/_pick_variant | 30 ++++++++++++++++++++-------
 1 file changed, 22 insertions(+), 8 deletions(-)

diff --git a/Completion/Base/Utility/_pick_variant b/Completion/Base/Utility/_pick_variant
index 9099e3599..872e8f583 100644
--- a/Completion/Base/Utility/_pick_variant
+++ b/Completion/Base/Utility/_pick_variant
@@ -1,9 +1,15 @@
 #autoload
 
-local output cmd pat
+local output cmd pat pre
 local -a var
 local -A opts
 
+# Precommands which allow their wrapped command to be a builtin.
+# All of these are necessarily builtins or reserved words themselves,
+# but not all builtin precommands are listed here:
+# for one, the 'command' builtin is excluded.
+local -ar builtin_precommands=(- builtin eval exec nocorrect noglob time)
+
 (( $+_cmd_variant )) || typeset -gA _cmd_variant
 
 zparseopts -D -A opts b: c: r:
@@ -13,19 +19,27 @@ while [[ $1 = *=* ]]; do
   var+=( "${1%%\=*}" "${1#*=}" )
   shift
 done
-if (( $+_cmd_variant[$opts[-c]] )); then
-  (( $+opts[-r] )) && eval "${opts[-r]}=${_cmd_variant[$opts[-c]]}"
-  [[ $_cmd_variant[$opts[-c]] = "$1" ]] && return 1
+
+if (( ${#precommands:|builtin_precommands} )); then
+  pre=command
+elif (( $+opts[-b] && ( $precommands[(I)builtin] || $+builtins[$opts[-c]] ) )); then
+  (( $+opts[-r] )) && eval "${opts[-r]}=$opts[-b]"
   return 0
+elif (( $precommands[(I)builtin] )); then
+  pre=builtin
+else
+  # Neither builtin nor command-forcing precommand specified,
+  # so no prefix is needed.
+  pre=
 fi
 
-if [[ $+opts[-b] -eq 1 && -n $builtins[$opts[-c]] ]]; then
-  _cmd_variant[$opts[-c]]=$opts[-b]
+if [[ $pre != builtin ]] && (( $+_cmd_variant[$opts[-c]] )); then
   (( $+opts[-r] )) && eval "${opts[-r]}=${_cmd_variant[$opts[-c]]}"
+  [[ $_cmd_variant[$opts[-c]] = "$1" ]] && return 1
   return 0
 fi
 
-output="$(_call_program variant $opts[-c] "${@[2,-1]}" </dev/null 2>&1)"
+output="$(_call_program variant $pre $opts[-c] "${@[2,-1]}" </dev/null 2>&1)"
 
 for cmd pat in "$var[@]"; do
   if [[ $output = *$~pat* ]]; then
@@ -36,6 +50,6 @@ for cmd pat in "$var[@]"; do
 done
 
 (( $+opts[-r] )) && eval "${opts[-r]}=$1"
-_cmd_variant[$opts[-c]]="$1"
+[[ $pre != builtin ]] && _cmd_variant[$opts[-c]]="$1"
 
 return 1
-- 
2.21.0