Use fzf by default for build-dir selector

build/build.plugin.zsh

@@ -85,6 +85,18 @@ EOF
     if [[ ${#local_build_dirs} -eq 0 ]]; then
       error "no build directories found"; return 1
     elif [[ ${#local_build_dirs} -gt 1 ]]; then
+      if command -v fzf &> /dev/null; then
+        # Use fzf to select a build directory
+        local_build_dir=$(
+          printf '%s\n' "${local_build_dir[@]}" $local_build_dirs |
+          fzf --layout=reverse --info=hidden --border=rounded \
+              --height=$(( ${#local_build_dirs} + 5 ))
+        )
+        if [[ $? -ne 0 ]]; then
+          return 1
+        fi
+      else
+        # Fallback to zcurses selector when fzf is not available
         zmodload zsh/curses && {
           # Get the size of the terminal
           local size=`stty size`
@@ -138,14 +150,16 @@ EOF
           zcurses delwin build-dir
           zcurses end
         }
-    fi
-  fi
 
         # On success setup the build directory for use
         if [[ $? -eq 0 ]]; then
           # Set the build directory from selection if empty
           [[ -z $local_build_dir ]] && \
             local_build_dir=${local_build_dirs[$index+1]}
+        fi
+      fi
+    fi
+  fi
 
   # If `build.ninja` exists in alias `ninja`, return.
   local build
@@ -176,7 +190,6 @@ EOF
   if [[ -n $do_build ]]; then
     eval build
   fi
-  fi
 }
 
 # Build then run a target residing in `~build/bin`.