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import { parse, print } from "graphql";
//
// 1. Parse the GraphQL tag.
// 2. From the parsed GraphQL query, get the AST definition.
// 3. From the AST definition, inject an import to that file inside the artifact directory
// 4. (TODO) MD5 the printed source text
// 5. (TODO) At runtime, if md5 !== import.md5, then warn the user that the query has changed
// but the file hasn't been updated so it must be reloaded.
// 6. Replace the TemplateLiteral with the default identifier from the injected import
let artifactDirectory: string = `__generated__`;
if (process.env.RELAY_ARTIFACT_DIRECTORY) {
artifactDirectory = process.env.RELAY_ARTIFACT_DIRECTORY;
}
if (process.env.BUN_MACRO_RELAY_ARTIFACT_DIRECTORY) {
artifactDirectory = process.env.BUN_MACRO_RELAY_ARTIFACT_DIRECTORY;
}
// TODO: platform-independent path cleaning
if (!artifactDirectory.startsWith("/")) {
while (artifactDirectory.endsWith("/")) {
artifactDirectory = artifactDirectory.substring(
0,
artifactDirectory.length - 1
);
}
artifactDirectory = Bun.cwd + artifactDirectory;
}
export function graphql(node) {
let query;
if (node instanceof <call />) {
query = node.arguments[0].toString();
} else if (node instanceof <template />) {
query = node.toString();
}
if (typeof query !== "string" || query.length === 0) {
throw new Error("BunMacroRelay: Unexpected empty graphql string.");
}
const ast = parse(query);
if (ast.definitions.length === 0) {
throw new Error("BunMacroRelay: Unexpected empty graphql tag.");
}
const definition = ast.definitions[0];
if (
definition.kind !== "FragmentDefinition" &&
definition.kind !== "OperationDefinition"
) {
throw new Error(
`BunMacroRelay: Expected a fragment, mutation, query, or subscription, got "${definition.kind}"`
);
}
const graphqlDefinition = definition;
const definitionName = graphqlDefinition.name && graphqlDefinition.name.value;
if (!definitionName) {
throw new Error("GraphQL operations and fragments must contain names");
}
const identifiername = `${definitionName}_$gql`;
const importStmt = (
<import
default={identifiername}
path={`${artifactDirectory}/${definitionName}.graphql`}
/>
);
return (
<>
<inject>{importStmt}</inject>
<id to={importStmt.namespace[identifiername]} pure />
</>
);
}
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