fix(no-raw-keys): do not report constants from other packages (#67)

Author: Jacobbrewer1

Diff for: sloglint.go

@@ -265,7 +265,18 @@ func visit(pass *analysis.Pass, opts *Options, node ast.Node, stack []ast.Node)
 
 	if opts.NoRawKeys {
 		forEachKey(pass.TypesInfo, keys, attrs, func(key ast.Expr) {
-			if ident, ok := key.(*ast.Ident); !ok || ident.Obj == nil || ident.Obj.Kind != ast.Con {
+			if selector, ok := key.(*ast.SelectorExpr); ok {
+				key = selector.Sel // the key is defined in another package, e.g. pkg.ConstKey.
+			}
+			isConst := false
+			if ident, ok := key.(*ast.Ident); ok {
+				if obj := pass.TypesInfo.ObjectOf(ident); obj != nil {
+					if _, ok := obj.(*types.Const); ok {
+						isConst = true
+					}
+				}
+			}
+			if !isConst {
 				pass.Reportf(call.Pos(), "raw keys should not be used")
 			}
 		})

Diff for: testdata/src/no_raw_keys/keys/keys.go

@@ -0,0 +1,3 @@
+package keys
+
+const Foo = "foo"

Diff for: testdata/src/no_raw_keys/no_raw_keys.go

@@ -1,6 +1,9 @@
 package no_raw_keys
 
-import "log/slog"
+import (
+	"log/slog"
+	"no_raw_keys/keys"
+)
 
 const foo = "foo"
 
@@ -11,6 +14,7 @@ func Foo(value int) slog.Attr {
 func tests() {
 	slog.Info("msg")
 	slog.Info("msg", foo, 1)
+	slog.Info("msg", keys.Foo, 1)
 	slog.Info("msg", Foo(1))
 	slog.Info("msg", slog.Int(foo, 1))
 	slog.Info("msg", slog.Attr{})