Merge pull request #136 from fdncred/eqize_timed_weather_run

port `timed_weather_run` to engine-q

engine-q/weather/timed_weather_run.nu

@@ -0,0 +1,67 @@
+# 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. It will need to be tweaked to actually be used in a
+# prompt, but for now it just prints the weather in these 3 ways.
+# 1. if it's never been run, it runs the weather command and saves the json cache info
+# 2. if the interval has not expired yet, it prints the Cached information
+# 3. if the interval has expired, it runs the weather command again and caches the info
+
+# this script is depenedent on get-weather
+source get-weather.nu
+
+#command to run at interval
+def timed_weather_run [
+    --command(-c): string # The command to run
+    --interval(-i): duration # The interval duration
+    ] {
+
+    # get the type of system we're on
+    let system_name = ((sys).host | get name)
+
+    if $system_name == "Windows" {
+        # $"The system is Windows(char nl)"
+        # generate temp file name
+        let weather_runtime_file = (($env.TMP) | path join weather_runtime_file.json)
+        # does the temp file already exist, meaning we've written it previously
+        if ($weather_runtime_file | path exists) == $true {
+            # $"Weather path exists [($weather_runtime_file)](char nl)"
+            # open the file and get the last weather data and run time out of it
+            let last_runtime_data = (open $weather_runtime_file)
+            # get the last runtime and add my timezone difference
+            let last_runtime = ($last_runtime_data | get last_run_time | into datetime)
+            if $last_runtime + $interval > (date now) {
+                # $"interval not met. last_runtime: [($last_runtime)](char nl)"
+                let temp = ($last_runtime_data.Temperature)
+                let emoji = ($last_runtime_data.Emoji)
+                $"Cached Temp: ($temp) Cached Emoji: ($emoji)"
+            } else {
+                # save the run time and run the command
+                # $"interval met, running command: [($command)](char nl)"
+
+                # it would be nice to run a dynamic command here but doesn't appear to be possible
+                # let weather_table = (do { $command })
+                let weather_table = (if $command == "get_weather" {(get_weather)})
+                let temp = ($weather_table.Temperature)
+                let emoji = ($weather_table.Emoji)
+                $"Temp: ($temp) Emoji: ($emoji)"
+                $weather_table | update last_run_time {(date now | date format '%Y-%m-%d %H:%M:%S %z')} | save $weather_runtime_file
+            }
+        } else {
+            $"Unable to find [($weather_runtime_file)], creating it(char nl)"
+            let weather_table = (get_weather)
+            let temp = ($weather_table.Temperature)
+            let emoji = ($weather_table.Emoji)
+            $"Created Temp: ($temp) Created Emoji: ($emoji)"
+            $weather_table | update last_run_time {(date now | date format '%Y-%m-%d %H:%M:%S %z')} | save $weather_runtime_file
+        }
+    } else {
+        # ToDo: refactor the info in the Windows section into another def. The only real difference
+        # is where the temp file will be located. Mac & Linux probably should be in /tmp I guess.
+        # everything else is linux or mac
+    }
+}
+
+timed_weather_run --command "get_weather" --interval 1min