cargo-rail 0.22.2

Cargo-native Rust workspace engine for affected CI, Rust source-surface analysis, compiler reuse, dependency coherence, exact-SHA releases, and split/sync
Documentation 
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//! Entry point for cargo-rail
//!
//! This is intentionally thin - all logic lives in the library.
use cargo_rail::commands::{self, CargoCli, PreContextDispatch, RailCli};
use cargo_rail::error::{RailError, RailResult, print_error};
use cargo_rail::instrumentation::DiagnosticSession;

use clap::Parser;
use std::time::Instant;

fn main() {
    match cargo_rail::compiler::invocation::dispatch() {
        cargo_rail::compiler::invocation::PreClapDispatch::Cli => {}
        cargo_rail::compiler::invocation::PreClapDispatch::Exit(exit_code) => std::process::exit(exit_code),
    }

    let cli_preparation_started = Instant::now();
    let CargoCli::Rail(mut cli) = CargoCli::parse();

    // Apply global --json flag to command format fields
    if cli.json
        && let Err(error) = cli.command.apply_json_override()
    {
        error.exit();
    }

    let diagnostics = match DiagnosticSession::start(cli.diagnostics_file.take()) {
        Ok(diagnostics) => diagnostics,
        Err(error) => exit_with_error(error),
    };
    let result = run(cli, cli_preparation_started);
    let diagnostics_result = diagnostics.finish();

    if let Err(error) = result {
        exit_with_error(error);
    }
    if let Err(error) = diagnostics_result {
        exit_with_error(error);
    }
}

fn run(cli: RailCli, cli_preparation_started: Instant) -> RailResult<()> {
    // Initialize output control (quiet mode)
    cargo_rail::output::init(cli.quiet);

    // Detect JSON mode early (before building workspace context)
    // This ensures progress messages during metadata loading are suppressed
    if cli.json || cli.command.is_json_format() {
        cargo_rail::output::set_json_mode(true);
    }

    // Get workspace root (from --workspace-root flag or current directory)
    let workspace_root = if let Some(ref root) = cli.workspace_root {
        if root.is_absolute() {
            root.clone()
        } else {
            match std::env::current_dir() {
                Ok(cwd) => cwd.join(root),
                Err(error) => {
                    cargo_rail::error!("failed to get current directory: {}", error);
                    return Err(RailError::ExitWithCode { code: 1 });
                }
            }
        }
    } else {
        match std::env::current_dir() {
            Ok(dir) => dir,
            Err(error) => {
                cargo_rail::error!("failed to get current directory: {}", error);
                return Err(RailError::ExitWithCode { code: 1 });
            }
        }
    };

    // Store config override path for commands that need it
    let config_override = cli.config.as_deref();

    let prepared = commands::try_dispatch_pre_context(cli.command, &workspace_root, config_override, cli.json);
    cargo_rail::instrumentation::record_cli_pre_context_preparation(cli_preparation_started);
    let prepared = match prepared {
        Ok(PreContextDispatch::Handled) => return Ok(()),
        Ok(PreContextDispatch::NeedsContext(prepared)) => prepared,
        Err(error) => return Err(error),
    };

    // Build one workspace context for the selected command.
    let workspace_capture_started = Instant::now();
    let context = prepared.build(&workspace_root);
    cargo_rail::instrumentation::record_workspace_capture_cargo_metadata(workspace_capture_started);
    let (command, ctx) = context?;
    if let Some(snapshot_id) = ctx.snapshot_id() {
        cargo_rail::instrumentation::record_snapshot_id(snapshot_id.to_string());
    }

    // Dispatch to command handler
    commands::dispatch(command, &ctx)
}

fn exit_with_error(err: RailError) -> ! {
    print_error(&err);
    std::process::exit(err.exit_code().as_i32());
}