zsh: functions: add alarm function for quick alarms

functions/misc.zsh

@@ -69,6 +69,30 @@ function beeper
     while true; do printf "\e[?5h\007"; sleep 0.25; printf "\e[?5l"; read -s -n -t1 && break; done;
 }
 
+# set an alarm in seconds, minutes, hours
+function alarm {
+    if [[ -z $1 ]]; then
+        echo "Usage: alarm 5[s]|5m|1h"
+        return 1
+    fi
+    local t
+    if [[ $1 = *"m" ]]; then
+        t=$((${1/m/}*60))
+        extra="($1)"
+    elif [[ $1 = *"h" ]]; then
+        t=$((${1/h/}*3600))
+        extra="($1)"
+    elif [[ $1 = *"s" ]]; then
+        t=${1/s/}
+    else
+        t=$1
+    fi
+
+    echo "Setting a timer for $1 $extra"
+
+    sleep $t && beeper
+}
+
 
 ## Simple http server for current directory (or path)
 function httpserver