[PATCH 2/3] completion: make: add a simpler parser

[Felipe Contreras <felipe.contreras@xxxxxxxxx>]

The make program does all the heavy lifting, there's no need to use a
full parser.

In the git build system I get an improvement of more than 3 times (from
3.68 to 1.07 seconds).

Signed-off-by: Felipe Contreras <felipe.contreras@xxxxxxxxx>
---
 Completion/Unix/Command/_make | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/Completion/Unix/Command/_make b/Completion/Unix/Command/_make
index 28c529a88..94747ae58 100644
--- a/Completion/Unix/Command/_make
+++ b/Completion/Unix/Command/_make
@@ -118,6 +118,24 @@ _make-parseMakefile () {
   done
 }
 
+_make-parseDataBase () {
+  local input var TAB=$'\t' IFS=
+
+  while read input
+  do
+    case "$input " in
+      ([[:alnum:]][[:alnum:]_]#[" "$TAB]#(\?|:|::|)=*)
+      var=${input%%[ $TAB]#(\?|:|::|)=*}
+      VARIABLES[$var]=1
+      ;;
+
+      ([[*?[:alnum:]$][^$TAB:=%]#:[^=]*)
+      TARGETS+=( ${input%%:*} )
+      ;;
+    esac
+  done
+}
+
 _make() {
 
   local prev="$words[CURRENT-1]" file expl tmp is_gnu incl match basedir nul=$'\0'
@@ -239,7 +257,7 @@ _make() {
       if [[ $is_gnu == gnu ]] 
       then
         if zstyle -t ":completion:${curcontext}:targets" call-command; then
-          _make-parseMakefile < <(_call_program targets "$words[1]" -nsp --no-print-directory -f "$file" .DEFAULT 2> /dev/null)
+          _make-parseDataBase < <(_call_program targets "$words[1]" -nsp --no-print-directory -f "$file" .DEFAULT 2> /dev/null)
         else
           _make-parseMakefile < $file
         fi
-- 
2.37.1.225.gfa48d685d2