Add a directive to suppress all warnings when generating code via the CLI

The code that is generated causes quite a few warnings from rustc and
clippy. This directive suppresses all such warnings. It's not included when
code is generated via the macro, since that code doesn't lead to warnings.

Author: autarch

CHANGELOG.md

@@ -10,6 +10,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 - The `variables_derives` now trims whitespace from individual derivation traits.
 - The new `reqwest-rustls` feature works like the `reqwest` feature but with
   `rustls` rather than `native-tls`.
+- Code generated by the `graphql-client` CLI program now suppresses all
+  warnings from rustc and clippy.
 
 ## 0.10.0 - 2021-07-04
 

graphql_client_cli/src/generate.rs

@@ -24,6 +24,8 @@ pub(crate) struct CliCodegenParams {
     pub fragments_other_variant: bool,
 }
 
+const WARNING_SUPPRESSION: &str = "#![allow(clippy::all, warnings)]";
+
 pub(crate) fn generate_code(params: CliCodegenParams) -> CliResult<()> {
     let CliCodegenParams {
         variables_derives,
@@ -78,7 +80,7 @@ pub(crate) fn generate_code(params: CliCodegenParams) -> CliResult<()> {
     let gen = generate_module_token_stream(query_path.clone(), &schema_path, options)
         .map_err(|err| Error::message(format!("Error generating module code: {}", err)))?;
 
-    let generated_code = gen.to_string();
+    let generated_code = format!("{}\n{}", WARNING_SUPPRESSION, gen);
     let generated_code = if !no_formatting {
         format(&generated_code)?
     } else {