fn handle_outputs()

in src/compiler/rust.rs [2224:2278]

• 48 lines of code
• 8 McCabe index (conditional complexity)

    fn handle_outputs(
        self: Box<Self>,
        path_transformer: &dist::PathTransformer,
        output_paths: &[PathBuf],
        extra_inputs: &[PathBuf],
    ) -> Result<()> {
        use std::io::Write;

        // Outputs in dep files (the files at the beginning of lines) are untransformed at this point -
        // remap-path-prefix is documented to only apply to 'inputs'.
        trace!("Pondering on rewriting dep file {:?}", self.dep_info);
        if let Some(dep_info) = self.dep_info {
            let extra_input_str = extra_inputs
                .iter()
                .fold(String::new(), |s, p| s + " " + &p.to_string_lossy());
            for dep_info_local_path in output_paths {
                trace!("Comparing with {}", dep_info_local_path.display());
                if dep_info == *dep_info_local_path {
                    info!("Replacing using the transformer {:?}", path_transformer);
                    // Found the dep info file, read it in
                    let f = fs::File::open(&dep_info)
                        .with_context(|| "Failed to open dep info file")?;
                    let mut deps = String::new();
                    { f }.read_to_string(&mut deps)?;
                    // Replace all the output paths, at the beginning of lines
                    for (local_path, dist_path) in get_path_mappings(path_transformer) {
                        let re_str = format!("(?m)^{}", regex::escape(&dist_path));
                        let local_path_str = local_path.to_str().with_context(|| {
                            format!(
                                "could not convert {} to string for RE replacement",
                                local_path.display()
                            )
                        })?;
                        error!(
                            "RE replacing {} with {} in {}",
                            re_str, local_path_str, deps
                        );
                        let re = regex::Regex::new(&re_str).expect("Invalid regex");
                        deps = re.replace_all(&deps, local_path_str).into_owned();
                    }
                    if !extra_inputs.is_empty() {
                        deps = deps.replace(": ", &format!(":{} ", extra_input_str));
                    }
                    // Write the depinfo file
                    let f =
                        fs::File::create(&dep_info).context("Failed to recreate dep info file")?;
                    { f }.write_all(deps.as_bytes())?;
                    return Ok(());
                }
            }
            // We expected there to be dep info, but none of the outputs matched
            bail!("No outputs matched dep info file {}", dep_info.display());
        }
        Ok(())
    }