Merge pull request #4435 from DanilaFe/flake-input-types

Allow Flake inputs to accept boolean and integer attributes

Author: edolstra

src/libexpr/flake/flake.cc

@@ -120,11 +120,20 @@ static FlakeInput parseFlakeInput(EvalState & state,
                 expectType(state, nString, *attr.value, *attr.pos);
                 input.follows = parseInputPath(attr.value->string.s);
             } else {
-                if (attr.value->type() == nString)
-                    attrs.emplace(attr.name, attr.value->string.s);
-                else
-                    throw TypeError("flake input attribute '%s' is %s while a string is expected",
-                        attr.name, showType(*attr.value));
+                switch (attr.value->type()) {
+                    case nString:
+                        attrs.emplace(attr.name, attr.value->string.s);
+                        break;
+                    case nBool:
+                        attrs.emplace(attr.name, Explicit<bool> { attr.value->boolean });
+                        break;
+                    case nInt:
+                        attrs.emplace(attr.name, attr.value->integer);
+                        break;
+                    default:
+                        throw TypeError("flake input attribute '%s' is %s while a string, Boolean, or integer is expected",
+                            attr.name, showType(*attr.value));
+                }
             }
         } catch (Error & e) {
             e.addTrace(*attr.pos, hintfmt("in flake attribute '%s'", attr.name));