git-step 0.1.1

A tool to step through git commits
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73

use assert_cmd::{
    assert::Assert,
    prelude::{CommandCargoExt, OutputAssertExt},
};
use assert_fs::{
    prelude::{FileWriteStr, PathAssert, PathChild},
    TempDir,
};
use rexpect::session::PtySession;
use std::{ffi::OsStr, process::Command};

pub struct GitStep {
    command: Command,
}

impl GitStep {
    pub fn make(dir: &TempDir) -> Self {
        let mut command = Command::cargo_bin("git-step").unwrap();
        command.current_dir(dir);
        Self { command }
    }

    pub fn arg<S: AsRef<OsStr>>(mut self, arg: S) -> Self {
        self.command.arg(arg.as_ref());
        self
    }

    pub fn interactive(self) -> PtySession {
        rexpect::session::spawn_command(self.command, Some(10_000)).unwrap()
    }

    pub fn non_interactive(&mut self) -> Assert {
        self.command.assert()
    }
}

fn run_git_command(dir: &TempDir, subcommand: &str, args: Vec<&str>) {
    Command::new("git")
        .current_dir(&dir)
        .arg(subcommand)
        .args(args)
        .assert()
        .success();
}

// TODO: Tidy, builder pattern?
pub fn setup_temp_git_repository() -> TempDir {
    let temp_dir = TempDir::new().unwrap();

    run_git_command(&temp_dir, "init", vec![]);

    temp_dir.child(".git").assert(predicates::path::exists());

    temp_dir
        .child("README.md")
        .write_str("Hello world")
        .unwrap();

    run_git_command(&temp_dir, "add", vec!["."]);
    run_git_command(&temp_dir, "commit", vec!["-m", "init"]);

    temp_dir.child("README.md").write_str("Foo bar").unwrap();

    run_git_command(&temp_dir, "add", vec!["."]);
    run_git_command(&temp_dir, "commit", vec!["-m", "edited"]);

    temp_dir.child("README.md").write_str("Fizz buzz").unwrap();

    run_git_command(&temp_dir, "add", vec!["."]);
    run_git_command(&temp_dir, "commit", vec!["-m", "edited again"]);

    temp_dir
}