New config format and new features

We're now using json as a config format instead of our weird own format.

The weather icon is now optional, simply don't define WeatherPlace in your
config.

You can now specify which subreddit to get background images from. The
default is still /r/EarthPorn.

1 files changed, 33 insertions, 0 deletions

diff --git a/interval/interval.go b/interval/interval.go
new file mode 100644
index 0000000..35996bb
--- /dev/null
+++ b/interval/interval.go
@@ -0,0 +1,33 @@
+package interval
+
+import (
+	"time"
+)
+
+// IntervalRunner is used to run a function again only after a certain time
+type IntervalRunner struct {
+	durationSuccess time.Duration
+	durationFailure time.Duration
+	lastRun         time.Time
+	success         bool
+}
+
+func NewIntervalRunner(durationSuccess, durationFailure time.Duration) *IntervalRunner {
+	return &IntervalRunner{durationSuccess: durationSuccess, durationFailure: durationFailure}
+}
+
+// Run runs the passed in fn function, if the last run is a certain duration ago.
+func (ir *IntervalRunner) Run(fn func() bool) {
+	var duration time.Duration
+	if ir.success {
+		duration = ir.durationSuccess
+	} else {
+		duration = ir.durationFailure
+	}
+
+	now := time.Now()
+	if ir.lastRun.Add(duration).Before(now) {
+		ir.success = fn()
+		ir.lastRun = now
+	}
+}