Initial configuration support.

config/config.go

@@ -0,0 +1,79 @@
+package config
+
+import (
+	"slices"
+	"time"
+
+	"code.humancabbage.net/sam/moonmath/coindesk"
+	"code.humancabbage.net/sam/moonmath/moon"
+	"github.com/knadh/koanf/parsers/toml"
+	"github.com/knadh/koanf/providers/file"
+	"github.com/knadh/koanf/providers/structs"
+	"github.com/knadh/koanf/v2"
+)
+
+var k = koanf.New(".")
+
+func Load(path string) (data Data, err error) {
+	err = k.Load(structs.Provider(Default, "koanf"), nil)
+	if err != nil {
+		return
+	}
+	if path != "" {
+		err = k.Load(file.Provider(path), toml.Parser())
+		if err != nil {
+			return
+		}
+	}
+	err = k.Unmarshal("", &data)
+	if err != nil {
+		return
+	}
+
+	return
+}
+
+var Default = Data{
+	Asset:         coindesk.BTC,
+	Goals:         moon.DefaultGoals,
+	ConstantBases: moon.DefaultConstantBases,
+	RelativeBases: moon.DefaultRelativeBases,
+}
+
+type Data struct {
+	Asset         coindesk.Asset      `koanf:"asset"`
+	Goals         []moon.Goal         `koanf:"goals"`
+	ConstantBases []moon.ConstantBase `koanf:"constantBases"`
+	RelativeBases []moon.RelativeBase `koanf:"relativeBases"`
+}
+
+type Goal struct {
+	Name  string  `koanf:"name"`
+	Value float64 `koanf:"value"`
+}
+
+// GetBases returns the concatenation of the constant and relative bases, sorted
+// from most recent to least recent in time.
+func GetBases(d *Data) (bases []moon.Base) {
+	for _, b := range d.ConstantBases {
+		bases = append(bases, b)
+	}
+	for _, b := range d.RelativeBases {
+		bases = append(bases, b)
+	}
+	now := time.Now()
+	slices.SortFunc(bases, func(a, b moon.Base) int {
+		aTime := a.From(now)
+		bTime := b.From(now)
+		aFirst := aTime.Before(bTime)
+		bFirst := bTime.Before(aTime)
+		switch {
+		case aFirst:
+			return 1
+		case bFirst:
+			return -1
+		}
+		return 0
+	})
+	return
+}

config/eth.toml

@@ -0,0 +1,25 @@
+asset = "ETH"
+
+[[goals]]
+name = "$5k"
+value = 5000
+
+[[goals]]
+name = "$7.5k"
+value = 7500
+
+[[goals]]
+name = "$10k"
+value = 10000
+
+[[goals]]
+name = "$15k"
+value = 15000
+
+[[goals]]
+name = "$20k"
+value = 15000
+
+[[goals]]
+name = "$25k"
+value = 25000