simplify and speed up gitstatus/pull-upstream.zsh

gitstatus/pull-upstream.zsh

@@ -9,10 +9,10 @@ setopt err_exit no_unset pipe_fail extended_glob xtrace
 readonly GITSTATUS_DIR GITSTATUS_URL
 readonly -a IGNORE=(pull-upstream.zsh README.md)
 
-function pull() {
-  local repo && repo=$(mktemp -d ${TMPDIR:-/tmp}/gitstatus-pull-upstream.XXXXXXXXXX)
+() {
+  local repo && repo="$(mktemp -d ${TMPDIR:-/tmp}/gitstatus-pull-upstream.XXXXXXXXXX)"
   trap "rm -rf ${(q)repo}" EXIT
-  git clone $GITSTATUS_URL $repo
+  git clone --depth 1 --single-branch $GITSTATUS_URL $repo
 
   local dst
   for dst in $GITSTATUS_DIR/**/*(.,@); do
@@ -22,9 +22,7 @@ function pull() {
     [[ -f $src ]] && {
       mkdir -p ${dst:h} && cp -f $src $dst || return
     } || {
-      rm $dst
+      rm -f $dst
     }
   done
 }
-
-pull