add timed_weather that checks the weather at timed intervals (#349)

weather/timed_weather_run_env.nu

@@ -0,0 +1,44 @@
+# This script will run a command, in this case get_weather, at a prescribed interval
+# This is meant to be run from your prompt so that it runs every time you cd or
+# run a command. Each time it will check if it's been longer than the interval and
+# if so, run the command, otherwise it uses the cached weather information.
+# I wrote this so I could have weather in my prompt but not pay the price of hitting
+# the web for every prompt.
+
+# this script is depenedent on get-weather
+use get-weather.nu get_weather
+
+# Create a mutable weather table to hold the weather data
+let-env WEATHER = (get_weather | upsert last_run_time { (date now | date format '%Y-%m-%d %H:%M:%S %z')})
+
+#command to run at interval
+def-env timed_weather_run [
+    --interval(-i): duration # The interval duration
+    ] {
+
+    # get the last runtime and add my timezone difference
+    let last_runtime = ($env.WEATHER | get last_run_time | into datetime)
+    if $last_runtime + $interval > (date now) {
+        # $"interval not met. last_runtime: [($last_runtime)](char nl)"
+        let temp = ($env.WEATHER.Temperature)
+        let emoji = ($env.WEATHER.Emoji)
+        {
+            Temperature: ($temp)
+            Source: "cache"
+            Emoji: ($emoji)
+        }
+    } else {
+        # $"interval met, running command: [($command)](char nl)"
+
+        let-env WEATHER = (get_weather | upsert last_run_time { (date now | date format '%Y-%m-%d %H:%M:%S %z')})
+        let temp = ($env.WEATHER.Temperature)
+        let emoji = ($env.WEATHER.Emoji)
+        {
+            Temperature: ($temp)
+            Source: "expired-cache"
+            Emoji: ($emoji)
+        }
+    }
+}
+
+timed_weather_run --interval 1min