survive broken $TMPDIR

internal/p10k.zsh

@@ -6280,8 +6280,13 @@ _p9k_dump_instant_prompt() {
       out+="$cr${(pl:$((height-prompt_height))::\n:)}$terminfo[sc]$out"
     fi
   fi
-  typeset -g __p9k_instant_prompt_output=${TMPDIR:-/tmp}/p10k-instant-prompt-output-${(%):-%n}-$$
-  { echo -n > $__p9k_instant_prompt_output } || return
+  if [[ -n "$TMPDIR" && ( ( -d "$TMPDIR" && -w "$TMPDIR" ) || ! ( -d /tmp && -w /tmp ) ) ]]; then
+    local tmpdir=$TMPDIR
+  else
+    local tmpdir=/tmp
+  fi
+  typeset -g __p9k_instant_prompt_output=$tmpdir/p10k-instant-prompt-output-${(%):-%n}-$$
+  { : > $__p9k_instant_prompt_output } || return
   print -rn -- "${out}${esc}?2004h" || return
   if (( $+commands[stty] )); then
     command stty -icanon 2>/dev/null
@@ -7802,7 +7807,12 @@ function _p9k_wrap_widgets() {
     # There is no zle-line-pre-redraw in zsh < 5.3, so we have to wrap all widgets
     # with key bindings. This costs extra 3ms: 1.5ms to fetch the list of widgets and
     # another 1.5ms to wrap them.
-    local keymap tmp=${TMPDIR:-/tmp}/p10k.bindings.$sysparams[pid]
+    if [[ -n "$TMPDIR" && ( ( -d "$TMPDIR" && -w "$TMPDIR" ) || ! ( -d /tmp && -w /tmp ) ) ]]; then
+      local tmpdir=$TMPDIR
+    else
+      local tmpdir=/tmp
+    fi
+    local keymap tmp=$tmpdir/p10k.bindings.$sysparams[pid]
     {
       for keymap in $keymaps; do bindkey -M $keymap; done >$tmp
       local -aU widget_list=(
@@ -8259,7 +8269,7 @@ _p9k_must_init() {
     [[ $sig == $_p9k__param_sig ]] && return 1
     _p9k_deinit
   fi
-  _p9k__param_pat=$'v133\1'${(q)ZSH_VERSION}$'\1'${(q)ZSH_PATCHLEVEL}$'\1'
+  _p9k__param_pat=$'v134\1'${(q)ZSH_VERSION}$'\1'${(q)ZSH_PATCHLEVEL}$'\1'
   _p9k__param_pat+=$__p9k_force_term_shell_integration$'\1'
   _p9k__param_pat+=$'${#parameters[(I)POWERLEVEL9K_*]}\1${(%):-%n%#}\1$GITSTATUS_LOG_LEVEL\1'
   _p9k__param_pat+=$'$GITSTATUS_ENABLE_LOGGING\1$GITSTATUS_DAEMON\1$GITSTATUS_NUM_THREADS\1'

internal/wizard.zsh

@@ -1537,9 +1537,16 @@ function ask_config_overwrite() {
   case $choice in
     r) return 1;;
     y)
-      config_backup="$(mktemp ${TMPDIR:-/tmp}/$__p9k_cfg_basename.XXXXXXXXXX)" || quit -c
+      if [[ -n "$TMPDIR" && ( ( -d "$TMPDIR" && -w "$TMPDIR" ) || ! ( -d /tmp && -w /tmp ) ) ]]; then
+        local tmpdir=$TMPDIR
+        local tmpdir_u='$TMPDIR'
+      else
+        local tmpdir=/tmp
+        local tmpdir_u=/tmp
+      fi
+      config_backup="$(mktemp $tmpdir/$__p9k_cfg_basename.XXXXXXXXXX)" || quit -c
       cp $__p9k_cfg_path $config_backup                                        || quit -c
-      config_backup_u=${${TMPDIR:+\$TMPDIR}:-/tmp}/${(q-)config_backup:t}
+      config_backup_u=$tmpdir_u/${(q-)config_backup:t}
     ;;
   esac
   return 0
@@ -1600,16 +1607,23 @@ function ask_zshrc_edit() {
     y)
       write_zshrc=1
       if [[ -n $zshrc_content ]]; then
-        zshrc_backup="$(mktemp ${TMPDIR:-/tmp}/.zshrc.XXXXXXXXXX)" || quit -c
-        cp -p $__p9k_zshrc $zshrc_backup                           || quit -c
+        if [[ -n "$TMPDIR" && ( ( -d "$TMPDIR" && -w "$TMPDIR" ) || ! ( -d /tmp && -w /tmp ) ) ]]; then
+          local tmpdir=$TMPDIR
+          local tmpdir_u='$TMPDIR'
+        else
+          local tmpdir=/tmp
+          local tmpdir_u=/tmp
+        fi
+        zshrc_backup="$(mktemp $tmpdir/.zshrc.XXXXXXXXXX)" || quit -c
+        cp -p $__p9k_zshrc $zshrc_backup                   || quit -c
         local -i writable=1
         if [[ ! -w $zshrc_backup ]]; then
-          chmod u+w -- $zshrc_backup                               || quit -c
+          chmod u+w -- $zshrc_backup                       || quit -c
           writable=0
         fi
-        print -r -- $zshrc_content >$zshrc_backup                  || quit -c
-        (( writable )) || chmod u-w -- $zshrc_backup               || quit -c
-        zshrc_backup_u=${${TMPDIR:+\$TMPDIR}:-/tmp}/${(q-)zshrc_backup:t}
+        print -r -- $zshrc_content >$zshrc_backup          || quit -c
+        (( writable )) || chmod u-w -- $zshrc_backup       || quit -c
+        zshrc_backup_u=$tmpdir_u/${(q-)zshrc_backup:t}
       fi
     ;;
   esac

internal/worker.zsh

@@ -181,7 +181,13 @@ function _p9k_worker_start() {
   setopt monitor || return
   {
     [[ -n $_p9k__worker_resp_fd ]] && return
-    _p9k__worker_file_prefix=${TMPDIR:-/tmp}/p10k.worker.$EUID.$sysparams[pid].$EPOCHSECONDS
+
+    if [[ -n "$TMPDIR" && ( ( -d "$TMPDIR" && -w "$TMPDIR" ) || ! ( -d /tmp && -w /tmp ) ) ]]; then
+      local tmpdir=$TMPDIR
+    else
+      local tmpdir=/tmp
+    fi
+    _p9k__worker_file_prefix=$tmpdir/p10k.worker.$EUID.$sysparams[pid].$EPOCHSECONDS
 
     sysopen -r -o cloexec -u _p9k__worker_resp_fd <(
       exec 0</dev/null