chore(gonf): first draft of the gonf lib with commands, files, packages and variables

1 files changed, 57 insertions, 0 deletions

diff --git a/gonf/variables.go b/gonf/variables.go
new file mode 100644
index 0000000..3c365ae
--- /dev/null
+++ b/gonf/variables.go
@@ -0,0 +1,57 @@
+package gonf
+
+import "log/slog"
+
+// ----- Globals ---------------------------------------------------------------
+var variables map[string]*VariablePromise
+
+// ----- Init ------------------------------------------------------------------
+func init() {
+	variables = make(map[string]*VariablePromise)
+}
+
+// ----- Public ----------------------------------------------------------------
+func Default(name string, value Value) *VariablePromise {
+	if v, ok := variables[name]; ok {
+		if !v.isDefault {
+			slog.Debug("default would overwrite a variable, ignoring", "name", name, "old_value", v.value, "new_value", value)
+			return nil
+		}
+		slog.Error("default is being overwritten", "name", name, "old_value", v.value, "new_value", value)
+	}
+	v := &VariablePromise{
+		isDefault: true,
+		name:      name,
+		value:     value,
+	}
+	variables[name] = v
+	return v
+}
+func Variable(name string, value Value) *VariablePromise {
+	if v, ok := variables[name]; ok && !v.isDefault {
+		slog.Error("variable is being overwritten", "name", name, "old_value", v, "new_value", value)
+	}
+	v := &VariablePromise{
+		isDefault: false,
+		name:      name,
+		value:     value,
+	}
+	variables[name] = v
+	return v
+}
+
+type VariablePromise struct {
+	isDefault bool
+	name      string
+	value     Value
+}
+
+// ----- Internal --------------------------------------------------------------
+func getVariable(name string) string {
+	if v, ok := variables[name]; ok {
+		return v.value.String()
+	} else {
+		slog.Error("undefined variable or default", "name", name)
+		return name
+	}
+}