lib/bourne-shell: Switch ls color option based on implementation

Co-authored-by: Koichi Murase <[email protected]>

lib/bourne-shell.sh

@@ -60,13 +60,21 @@ esac
 # enable color support of ls and also add handy aliases
 if [ -x /usr/bin/dircolors ]; then
   test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
-  _omb_util_alias ls='ls --color=auto'
   #_omb_util_alias ls='dir --color=auto'
   #_omb_util_alias vdir='vdir --color=auto'
 
   # Note: aliases "grep", "fgrep", and "egrep" are merged in lib/grep.sh
 fi
 
+function _omb_util_alias_select_ls {
+  if command ls --color=auto ~ &>/dev/null; then
+    _omb_command='ls --color=auto'
+  elif command ls -G ~ &>/dev/null; then
+    _omb_command='ls -G'
+  fi
+}
+_omb_util_alias_delayed ls
+
 # colored GCC warnings and errors
 #export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'