first commit

internal/generate/ids.go

@@ -0,0 +1,52 @@
+package generate
+
+import (
+	"crypto/rand"
+	"encoding/hex"
+	"log"
+	"strings"
+)
+
+func id(prefix string, length int) string {
+	var id [16]byte
+	var buffer [32]byte
+	builder := strings.Builder{}
+	builder.Grow(length + 31)
+	builder.WriteString(prefix)
+
+	for builder.Len() < length {
+		_, err := rand.Read(id[:])
+		if err != nil {
+			log.Panicln("generate.id: failed to use OS random:", err)
+		}
+
+		hex.Encode(buffer[:], id[:])
+		builder.Write(buffer[:])
+	}
+
+	return builder.String()[:length]
+}
+
+func GroupID() string {
+	return id("G", 16)
+}
+
+func ItemID() string {
+	return id("I", 16)
+}
+
+func ProjectID() string {
+	return id("P", 16)
+}
+
+func TaskID() string {
+	return id("T", 16)
+}
+
+func LogID() string {
+	return id("L", 16)
+}
+
+func GoalID() string {
+	return id("A", 16)
+}