feat(lint): lint code-like dollar-quoted SQL strings

pkg/lint/lint_test.go

@@ -154,3 +154,23 @@ func TestPlpgsqlBodyLint(t *testing.T) {
 		t.Errorf("PLPGSQL syntax error: %+v", pl)
 	}
 }
+
+func TestEmbeddedDollarSQLLint(t *testing.T) {
+	src := "create function f() returns void language plpgsql as $$\nbegin\n  execute $q$\n    select * from t\n  $q$;\nend;\n$$;\n" +
+		"create function s() returns int language sql as $$ select * from u $$;\n" +
+		"create function p() returns void language plpython3u as $$\nselect * from nothing\n$$;\n" +
+		"select format($f$select %I from t$f$, 'a');\n"
+	diags, err := lint.New().Check(src, "x.sql")
+	if err != nil {
+		t.Fatal(err)
+	}
+	var got [][2]int
+	for _, d := range diags {
+		if d.RuleID == "COR001" {
+			got = append(got, [2]int{d.Line, d.Col})
+		}
+	}
+	if len(got) != 2 || got[0] != [2]int{4, 12} || got[1] != [2]int{8, 59} {
+		t.Errorf("COR001 positions: %v", got)
+	}
+}