[PATCH] _less: add --color (synonym for -D)

["Jun. T" <takimoto-j@kba.biglobe.ne.jp>]

--color is a synonym for -D.
Also recognize - as a default color, so that
less -Du-<TAB>
offers background color.

While preparing this patch, I've noticed another minor problem of _less
but how to fix it is not obvious to me.
I will discuss it in another post.



diff --git a/Completion/Unix/Command/_less b/Completion/Unix/Command/_less
index ae912a633..0a72782ef 100644
--- a/Completion/Unix/Command/_less
+++ b/Completion/Unix/Command/_less
@@ -39,7 +39,7 @@ _arguments -S -s -A "[-+]*"  \
   '(-C --CLEAR-SCREEN -c --clear-screen)'{-c,--clear-screen}'[repaint screen instead of scrolling]' \
   '!(-c --clear-screen)'{-C,--CLEAR-SCREEN} \
   '(-d --dumb)'{-d,--dumb}'[suppress error message if terminal is dumb]' \
-  '*-D+[set screen colors]: :->colors' \
+  '*'{-D+,--color=}'[set screen colors]: :->colors' \
   '(-e -E --quit-at-eof --QUIT-AT-EOF)'{-e,--quit-at-eof}'[exit the second time end-of-file is reached]' \
   '(-e -E --quit-at-eof --QUIT-AT-EOF)'{-E,--QUIT-AT-EOF}'[exit when end-of-file is reached]' \
   '(-f --force)'{-f,--force}'[force opening of non-regular files]' \
@@ -104,7 +104,7 @@ if [[ -n "$state" ]]; then
       if compset -P 1 \?; then
         [[ $IPREFIX[-1] != [a-z] ]] || compset -P 1 + || _describe 'color application' '( +:add\ to\ existing\ attribute )'
         suf=( -S '' )
-        compset -P 1 '([a-zA-Z]|*.)' && fgbg=background && suf=()
+        compset -P 1 '([-a-zA-Z]|*.)' && fgbg=background && suf=()
         basic=( B:blue C:cyan G:green K:black M:magenta R:red W:white Y:yellow )
         _describe -t colors "$fgbg color" \
             "( -:default ${(j. .)${(@)basic/:/:light\ }} ${(Lj. .)basic} )" "$suf[@]"  && ret=0