dimpact 0.1.0

impact analysis from diff
Documentation 
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use dimpact::engine::CapsHint;
use serial_test::serial;
use std::fs;
use std::process::Command;
use tempfile::TempDir;

fn git(cwd: &std::path::Path, args: &[&str]) -> std::process::Output {
    let mut cmd = Command::new("git");
    cmd.args(args).current_dir(cwd);
    let out = cmd.output().expect("git command failed to spawn");
    if !out.status.success() {
        panic!(
            "git {:?} failed: status {:?}\nstdout:{}\nstderr:{}",
            args,
            out.status,
            String::from_utf8_lossy(&out.stdout),
            String::from_utf8_lossy(&out.stderr)
        );
    }
    out
}

fn setup_repo_basic() -> (TempDir, std::path::PathBuf) {
    let dir = TempDir::new().expect("tempdir");
    let path = dir.path().to_path_buf();
    git(&path, &["init", "-q"]);
    git(&path, &["config", "user.email", "tester@example.com"]);
    git(&path, &["config", "user.name", "Tester"]);

    fs::write(path.join("main.rs"), "fn bar() {}\nfn foo() { bar(); }\n").unwrap();
    git(&path, &["add", "."]);
    git(&path, &["commit", "-m", "init", "-q"]);
    fs::write(
        path.join("main.rs"),
        "fn bar() { let _x=1; }\nfn foo() { bar(); }\n",
    )
    .unwrap();
    (dir, path)
}

#[test]
#[serial]
fn lsp_engine_falls_back_changed() {
    let (_tmp, repo) = setup_repo_basic();
    let diff_out = git(&repo, &["diff", "--no-ext-diff", "--unified=0"]);
    let diff = String::from_utf8(diff_out.stdout).unwrap();

    let files = dimpact::parse_unified_diff(&diff).unwrap();
    let cfg = dimpact::EngineConfig {
        lsp_strict: false,
        dump_capabilities: false,
        mock_lsp: false,
        mock_caps: None,
    };
    let engine = dimpact::engine::make_engine(dimpact::EngineKind::Lsp, cfg);

    let cwd = std::env::current_dir().unwrap();
    std::env::set_current_dir(&repo).unwrap();
    let changed = engine
        .changed_symbols(&files, dimpact::LanguageMode::Rust)
        .unwrap();
    std::env::set_current_dir(cwd).unwrap();

    assert!(changed.changed_symbols.iter().any(|s| s.name == "bar"));
}

#[test]
#[serial]
fn lsp_engine_falls_back_impact_callers() {
    let (_tmp, repo) = setup_repo_basic();
    let diff_out = git(&repo, &["diff", "--no-ext-diff", "--unified=0"]);
    let diff = String::from_utf8(diff_out.stdout).unwrap();
    let files = dimpact::parse_unified_diff(&diff).unwrap();

    let cfg = dimpact::EngineConfig {
        lsp_strict: false,
        dump_capabilities: false,
        mock_lsp: false,
        mock_caps: None,
    };
    let engine = dimpact::engine::make_engine(dimpact::EngineKind::Auto, cfg);
    let opts = dimpact::ImpactOptions {
        direction: dimpact::ImpactDirection::Callers,
        max_depth: Some(100),
        with_edges: Some(false),
        ignore_dirs: Vec::new(),
    };

    let cwd = std::env::current_dir().unwrap();
    std::env::set_current_dir(&repo).unwrap();
    let out = engine
        .impact(&files, dimpact::LanguageMode::Rust, &opts)
        .unwrap();
    std::env::set_current_dir(cwd).unwrap();

    assert!(out.impacted_symbols.iter().any(|s| s.name == "foo"));
}

#[test]
#[serial]
fn lsp_engine_strict_errors() {
    // Ensure tests do not accidentally use a real server on dev machines
    unsafe {
        std::env::set_var("DIMPACT_DISABLE_REAL_LSP", "1");
    }
    let (_tmp, repo) = setup_repo_basic();
    let diff_out = git(&repo, &["diff", "--no-ext-diff", "--unified=0"]);
    let diff = String::from_utf8(diff_out.stdout).unwrap();
    let files = dimpact::parse_unified_diff(&diff).unwrap();

    let cfg = dimpact::EngineConfig {
        lsp_strict: true,
        dump_capabilities: false,
        mock_lsp: false,
        mock_caps: None,
    };
    let engine = dimpact::engine::make_engine(dimpact::EngineKind::Lsp, cfg);

    let cwd = std::env::current_dir().unwrap();
    std::env::set_current_dir(&repo).unwrap();
    let err = engine
        .changed_symbols(&files, dimpact::LanguageMode::Rust)
        .err();
    std::env::set_current_dir(cwd).unwrap();

    assert!(
        err.is_some(),
        "strict mode should error when LSP unavailable"
    );
}

#[test]
#[serial]
fn lsp_engine_strict_mock_succeeds() {
    let (_tmp, repo) = setup_repo_basic();
    let diff_out = git(&repo, &["diff", "--no-ext-diff", "--unified=0"]);
    let diff = String::from_utf8(diff_out.stdout).unwrap();
    let files = dimpact::parse_unified_diff(&diff).unwrap();

    // Enable mock LSP session (pretend server available)
    let cfg = dimpact::EngineConfig {
        lsp_strict: true,
        dump_capabilities: true,
        mock_lsp: true,
        mock_caps: None,
    };
    let engine = dimpact::engine::make_engine(dimpact::EngineKind::Lsp, cfg);

    let cwd = std::env::current_dir().unwrap();
    std::env::set_current_dir(&repo).unwrap();
    let changed = engine
        .changed_symbols(&files, dimpact::LanguageMode::Rust)
        .unwrap();
    let opts = dimpact::ImpactOptions {
        direction: dimpact::ImpactDirection::Callers,
        max_depth: Some(100),
        with_edges: Some(false),
        ignore_dirs: Vec::new(),
    };
    let out = engine
        .impact(&files, dimpact::LanguageMode::Rust, &opts)
        .unwrap();
    std::env::set_current_dir(cwd).unwrap();
    // no global env var modifications

    assert!(changed.changed_symbols.iter().any(|s| s.name == "bar"));
    assert!(out.impacted_symbols.iter().any(|s| s.name == "foo"));
}

#[test]
#[serial]
fn lsp_engine_strict_errors_when_caps_missing() {
    let (_tmp, repo) = setup_repo_basic();
    let diff_out = git(&repo, &["diff", "--no-ext-diff", "--unified=0"]);
    let diff = String::from_utf8(diff_out.stdout).unwrap();
    let files = dimpact::parse_unified_diff(&diff).unwrap();

    // Mock LSP available but without document/workspace symbol capabilities
    let caps = CapsHint {
        document_symbol: false,
        workspace_symbol: false,
        call_hierarchy: false,
        references: false,
        definition: false,
    };
    let cfg = dimpact::EngineConfig {
        lsp_strict: true,
        dump_capabilities: false,
        mock_lsp: true,
        mock_caps: Some(caps),
    };
    let engine = dimpact::engine::make_engine(dimpact::EngineKind::Lsp, cfg);

    let cwd = std::env::current_dir().unwrap();
    std::env::set_current_dir(&repo).unwrap();
    let err = engine
        .changed_symbols(&files, dimpact::LanguageMode::Rust)
        .err();
    std::env::set_current_dir(cwd).unwrap();
    assert!(err.is_some(), "strict + no caps should error");
}

#[test]
#[serial]
fn lsp_engine_strict_impact_errors_when_caps_missing() {
    let (_tmp, repo) = setup_repo_basic();
    let diff_out = git(&repo, &["diff", "--no-ext-diff", "--unified=0"]);
    let diff = String::from_utf8(diff_out.stdout).unwrap();
    let files = dimpact::parse_unified_diff(&diff).unwrap();

    // No callHierarchy/references/definition -> impact should error under strict
    let caps = CapsHint {
        document_symbol: true,
        workspace_symbol: true,
        call_hierarchy: false,
        references: false,
        definition: false,
    };
    let cfg = dimpact::EngineConfig {
        lsp_strict: true,
        dump_capabilities: false,
        mock_lsp: true,
        mock_caps: Some(caps),
    };
    let engine = dimpact::engine::make_engine(dimpact::EngineKind::Lsp, cfg);
    let opts = dimpact::ImpactOptions {
        direction: dimpact::ImpactDirection::Callers,
        max_depth: Some(1),
        with_edges: Some(false),
        ignore_dirs: Vec::new(),
    };

    let cwd = std::env::current_dir().unwrap();
    std::env::set_current_dir(&repo).unwrap();
    let err = engine
        .impact(&files, dimpact::LanguageMode::Rust, &opts)
        .err();
    std::env::set_current_dir(cwd).unwrap();
    assert!(err.is_some(), "strict + no impact caps should error");
}