dimpact 0.5.3

impact analysis from diff
Documentation 
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#![allow(deprecated)]
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
}

#[test]
fn callers_of_changed_method_are_impacted() {
    let dir = TempDir::new().unwrap();
    let repo = dir.path().to_path_buf();
    git(&repo, &["init", "-q"]);
    git(&repo, &["config", "user.email", "tester@example.com"]);
    git(&repo, &["config", "user.name", "Tester"]);
    let src = r#"struct S;
impl S { fn m(&self) {} }

fn m() {}

fn foo() {
    let s = S;
    s.m();
}
"#;
    fs::write(repo.join("main.rs"), src).unwrap();
    git(&repo, &["add", "."]);
    git(&repo, &["commit", "-m", "init", "-q"]);
    let src2 = r#"struct S;
impl S { fn m(&self) { let _x=1; } }

fn m() {}

fn foo() {
    let s = S;
    s.m();
}
"#;
    fs::write(repo.join("main.rs"), src2).unwrap();
    let diff = git(&repo, &["diff", "--no-ext-diff", "--unified=0"]);
    let mut cmd = assert_cmd::Command::cargo_bin("dimpact").unwrap();
    cmd.current_dir(&repo)
        .arg("--mode")
        .arg("impact")
        .arg("--direction")
        .arg("callers")
        .arg("--lang")
        .arg("rust")
        .arg("--format")
        .arg("json")
        .write_stdin(String::from_utf8(diff.stdout).unwrap());
    let assert = cmd.assert().success();
    let stdout = String::from_utf8_lossy(assert.get_output().stdout.as_ref());
    let v: serde_json::Value = serde_json::from_str(&stdout).unwrap();
    let names: Vec<&str> = v["impacted_symbols"]
        .as_array()
        .unwrap()
        .iter()
        .map(|s| s["name"].as_str().unwrap())
        .collect();
    assert!(names.contains(&"foo"));
}