atomwrite 0.1.1

Atomic file operations CLI for LLM agents — read, write, edit, search, replace with NDJSON output
Documentation 
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// SPDX-License-Identifier: MIT OR Apache-2.0

mod common;

#[test]
fn replace_modifies_file_atomically() {
    let dir = tempfile::tempdir().expect("tempdir");
    common::create_test_file(dir.path(), "rep.txt", "old_api(x)\nold_api(y)\n");

    let output = common::atomwrite()
        .args([
            "--workspace",
            dir.path().to_str().unwrap(),
            "replace",
            "old_api",
            "new_api",
        ])
        .arg(dir.path())
        .output()
        .expect("run");

    assert!(output.status.success());

    let events = common::parse_ndjson(&output.stdout);
    let replaced: Vec<_> = events.iter().filter(|e| e["type"] == "replaced").collect();
    assert!(!replaced.is_empty());
    assert_eq!(replaced[0]["replacements"], 2);
    assert!(replaced[0]["checksum_before"].is_string());
    assert!(replaced[0]["checksum_after"].is_string());

    let content = std::fs::read_to_string(dir.path().join("rep.txt")).expect("read");
    assert!(content.contains("new_api"));
    assert!(!content.contains("old_api"));
}

#[test]
fn replace_dry_run_does_not_modify() {
    let dir = tempfile::tempdir().expect("tempdir");
    common::create_test_file(dir.path(), "dry.txt", "original_text\n");

    let output = common::atomwrite()
        .args([
            "--workspace",
            dir.path().to_str().unwrap(),
            "replace",
            "--dry-run",
            "original_text",
            "new_text",
        ])
        .arg(dir.path())
        .output()
        .expect("run");

    assert!(output.status.success());

    let content = std::fs::read_to_string(dir.path().join("dry.txt")).expect("read");
    assert_eq!(content, "original_text\n", "file should not be modified");

    let events = common::parse_ndjson(&output.stdout);
    let plans: Vec<_> = events.iter().filter(|e| e["type"] == "plan").collect();
    assert!(!plans.is_empty());
}

#[test]
fn replace_literal_escapes_regex_chars() {
    let dir = tempfile::tempdir().expect("tempdir");
    common::create_test_file(dir.path(), "regex.txt", "fn foo() -> Result<(), Error>\n");

    let output = common::atomwrite()
        .args([
            "--workspace",
            dir.path().to_str().unwrap(),
            "replace",
            "--literal",
            "Result<(), Error>",
            "anyhow::Result<()>",
        ])
        .arg(dir.path())
        .output()
        .expect("run");

    assert!(output.status.success());

    let content = std::fs::read_to_string(dir.path().join("regex.txt")).expect("read");
    assert!(content.contains("anyhow::Result<()>"));
}

#[test]
fn replace_preview_shows_diff_without_writing() {
    let dir = tempfile::tempdir().expect("tempdir");
    common::create_test_file(dir.path(), "prev.txt", "hello world\n");

    let output = common::atomwrite()
        .args([
            "--workspace",
            dir.path().to_str().unwrap(),
            "replace",
            "--preview",
            "hello",
            "goodbye",
        ])
        .arg(dir.path())
        .output()
        .expect("run");

    assert!(output.status.success());

    let content = std::fs::read_to_string(dir.path().join("prev.txt")).expect("read");
    assert_eq!(content, "hello world\n", "file should not be modified");

    let events = common::parse_ndjson(&output.stdout);
    let previews: Vec<_> = events.iter().filter(|e| e["type"] == "preview").collect();
    assert!(!previews.is_empty());
    assert!(previews[0]["diff"].is_string());
}

#[test]
fn replace_max_replacements_limits_count() {
    let dir = tempfile::tempdir().expect("tempdir");
    common::create_test_file(dir.path(), "max.txt", "aaa\naaa\naaa\n");

    let output = common::atomwrite()
        .args([
            "--workspace",
            dir.path().to_str().unwrap(),
            "replace",
            "--max-replacements",
            "1",
            "aaa",
            "bbb",
        ])
        .arg(dir.path())
        .output()
        .expect("run");

    assert!(output.status.success());

    let content = std::fs::read_to_string(dir.path().join("max.txt")).expect("read");
    let bbb_count = content.matches("bbb").count();
    let aaa_count = content.matches("aaa").count();
    assert_eq!(bbb_count, 1);
    assert_eq!(aaa_count, 2);
}

#[test]
fn replace_summary_has_correct_counts() {
    let dir = tempfile::tempdir().expect("tempdir");
    common::create_test_file(dir.path(), "a.txt", "target\n");
    common::create_test_file(dir.path(), "b.txt", "no match\n");
    common::create_test_file(dir.path(), "c.txt", "target target\n");

    let output = common::atomwrite()
        .args([
            "--workspace",
            dir.path().to_str().unwrap(),
            "replace",
            "target",
            "replaced",
        ])
        .arg(dir.path())
        .output()
        .expect("run");

    assert!(output.status.success());

    let events = common::parse_ndjson(&output.stdout);
    let summary = events
        .iter()
        .find(|e| e["type"] == "summary")
        .expect("summary");
    assert!(summary["files_visited"].as_u64().unwrap() >= 3);
    assert!(summary["total_replacements"].as_u64().unwrap() >= 3);
}