Speed up tab completion

Fixes #20. Closes #23.

etc/bash_completion.d/brew

@@ -45,23 +45,9 @@ __brewcomp ()
 __brew_complete_formulae ()
 {
     local cur="${COMP_WORDS[COMP_CWORD]}"
-    local lib=$(brew --repository)/Library
-    local taps=${lib}/Taps
-    local ff=$(\ls ${lib}/Formula 2>/dev/null | sed 's/\.rb//g')
-    local af=$(\ls ${lib}/Aliases 2>/dev/null)
-    local tf file
-
-    for file in ${taps}/*/*/*.rb ${taps}/*/*/Formula/*.rb ${taps}/*/*/HomebrewFormula/*.rb; do
-        [ -f "$file" ] || continue
-        file=${file/"Formula/"/}
-        file=${file/"HomebrewFormula/"/}
-        file=${file#${lib}/Taps/}
-        file=${file%.rb}
-        file=${file/homebrew-/}
-        tf="${tf} ${file}"
-    done
-
-    COMPREPLY=($(compgen -W "$ff $af $tf" -- "$cur"))
+    local formulas="$(brew search)"
+    local shortnames="$(echo "$formulas" | grep / | cut -d / -f 3)"
+    COMPREPLY=($(compgen -W "$formulas $shortnames" -- "$cur"))
 }
 
 __brew_complete_installed ()