120e8620af6e1d7d01159614186403c7a816457d

 1diff --git a/plugins/timer/timer.plugin.zsh b/plugins/timer/timer.plugin.zsh
 2index f73d2ab533cb12e2ae27f510b854995bf79500d1..ee2cb66c14ce981a6ba92ac47ebe8571b07cc1e4 100644
 3--- a/plugins/timer/timer.plugin.zsh
 4+++ b/plugins/timer/timer.plugin.zsh
 5@@ -3,12 +3,12 @@ preexec() {
 6 }
 7 
 8 precmd() {
 9-  if [ -n "${__timer_cmd_start_time}" ]; then
10+  if [ -n "$__timer_cmd_start_time" ]; then
11     local cmd_end_time=$(date '+%s')
12-    local tdiff=$((${cmd_end_time} - ${__timer_cmd_start_time}))
13+    local tdiff=$((cmd_end_time - __timer_cmd_start_time))
14     unset __timer_cmd_start_time
15     local tdiffstr="$((tdiff / 60))m$((tdiff % 60))s"
16-    local cols=$(($COLUMNS - ${#tdiffstr#0m} - 2))
17+    local cols=$((COLUMNS - ${#tdiffstr#0m} - 2))
18     echo -e "\033[1A\033[${cols}C \`${tdiffstr#0m}"
19   fi
20 }