use crate::common::util::*;
use glob::glob;

/// Returns a string of numbers with the given range, each on a new line.
/// The upper bound is not included.
fn generate(from: u32, to: u32) -> String {
    (from..to).fold(String::new(), |acc, v| format!("{}{}\n", acc, v))
}

#[test]
fn test_stdin() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["-", "10"])
        .pipe_in(generate(1, 51))
        .succeeds()
        .stdout_only("18\n123\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(10, 51));
}

#[test]
fn test_up_to_line() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "10"])
        .succeeds()
        .stdout_only("18\n123\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(10, 51));
}

#[test]
fn test_up_to_line_repeat_twice() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "10", "{2}"])
        .succeeds()
        .stdout_only("18\n30\n30\n63\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 4);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(10, 20));
    assert_eq!(at.read("xx02"), generate(20, 30));
    assert_eq!(at.read("xx03"), generate(30, 51));
}

#[test]
fn test_up_to_line_sequence() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "10", "25"])
        .succeeds()
        .stdout_only("18\n45\n78\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(10, 25));
    assert_eq!(at.read("xx02"), generate(25, 51));
}

#[test]
fn test_up_to_match() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/9$/"])
        .succeeds()
        .stdout_only("16\n125\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 9));
    assert_eq!(at.read("xx01"), generate(9, 51));
}

#[test]
fn test_up_to_match_repeat_twice() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/9$/", "{2}"])
        .succeeds()
        .stdout_only("16\n29\n30\n66\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 4);
    assert_eq!(at.read("xx00"), generate(1, 9));
    assert_eq!(at.read("xx01"), generate(9, 19));
    assert_eq!(at.read("xx02"), generate(19, 29));
    assert_eq!(at.read("xx03"), generate(29, 51));
}

#[test]
fn test_up_to_match_sequence() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/9$/", "/5$/"])
        .succeeds()
        .stdout_only("16\n17\n108\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 9));
    assert_eq!(at.read("xx01"), generate(9, 15));
    assert_eq!(at.read("xx02"), generate(15, 51));
}

#[test]
fn test_up_to_match_offset() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/9$/+3"])
        .succeeds()
        .stdout_only("24\n117\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 12));
    assert_eq!(at.read("xx01"), generate(12, 51));
}

#[test]
fn test_up_to_match_offset_repeat_twice() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/9$/+3", "{2}"])
        .succeeds()
        .stdout_only("24\n30\n30\n57\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 4);
    assert_eq!(at.read("xx00"), generate(1, 12));
    assert_eq!(at.read("xx01"), generate(12, 22));
    assert_eq!(at.read("xx02"), generate(22, 32));
    assert_eq!(at.read("xx03"), generate(32, 51));
}

#[test]
fn test_up_to_match_negative_offset() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/9$/-3"])
        .succeeds()
        .stdout_only("10\n131\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 6));
    assert_eq!(at.read("xx01"), generate(6, 51));
}

#[test]
fn test_up_to_match_negative_offset_repeat_twice() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/9$/-3", "{2}"])
        .succeeds()
        .stdout_only("10\n26\n30\n75\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 4);
    assert_eq!(at.read("xx00"), generate(1, 6));
    assert_eq!(at.read("xx01"), generate(6, 16));
    assert_eq!(at.read("xx02"), generate(16, 26));
    assert_eq!(at.read("xx03"), generate(26, 51));
}

#[test]
fn test_up_to_match_repeat_always() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/9$/", "{*}"])
        .succeeds()
        .stdout_only("16\n29\n30\n30\n30\n6\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 6);
    assert_eq!(at.read("xx00"), generate(1, 9));
    assert_eq!(at.read("xx01"), generate(9, 19));
    assert_eq!(at.read("xx02"), generate(19, 29));
    assert_eq!(at.read("xx03"), generate(29, 39));
    assert_eq!(at.read("xx04"), generate(39, 49));
    assert_eq!(at.read("xx05"), generate(49, 51));
}

#[test]
fn test_up_to_match_repeat_over() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/9$/", "{50}"])
        .fails()
        .stdout_is("16\n29\n30\n30\n30\n6\n")
        .stderr_is("csplit: error: '/9$/': match not found on repetition 5");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/9$/", "{50}", "-k"])
        .fails()
        .stdout_is("16\n29\n30\n30\n30\n6\n")
        .stderr_is("csplit: error: '/9$/': match not found on repetition 5");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 6);
    assert_eq!(at.read("xx00"), generate(1, 9));
    assert_eq!(at.read("xx01"), generate(9, 19));
    assert_eq!(at.read("xx02"), generate(19, 29));
    assert_eq!(at.read("xx03"), generate(29, 39));
    assert_eq!(at.read("xx04"), generate(39, 49));
    assert_eq!(at.read("xx05"), generate(49, 51));
}

#[test]
fn test_skip_to_match() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%23%"])
        .succeeds()
        .stdout_only("84\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(23, 51));
}

#[test]
fn test_skip_to_match_sequence1() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%0$%", "%^4%"])
        .succeeds()
        .stdout_only("33\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(40, 51));
}

#[test]
fn test_skip_to_match_sequence2() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%0$%", "{1}", "%^4%"])
        .succeeds()
        .stdout_only("33\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(40, 51));
}

#[test]
fn test_skip_to_match_sequence3() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%0$%", "{1}", "/^4/"])
        .succeeds()
        .stdout_only("60\n33\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(20, 40));
    assert_eq!(at.read("xx01"), generate(40, 51));
}

#[test]
fn test_skip_to_match_sequence4() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%0$%", "/^4/"])
        .succeeds()
        .stdout_only("90\n33\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(10, 40));
    assert_eq!(at.read("xx01"), generate(40, 51));
}

#[test]
fn test_skip_to_match_offset() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%23%+3"])
        .succeeds()
        .stdout_only("75\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(26, 51));
}

#[test]
fn test_skip_to_match_negative_offset() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%23%-3"])
        .succeeds()
        .stdout_only("93\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(20, 51));
}

#[test]
fn test_skip_to_match_repeat_always() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%0$%", "{*}"])
        .succeeds()
        .no_stdout();

    let count = glob(&at.plus_as_string("xx*")).unwrap().count();
    assert_eq!(count, 0);
}

#[test]
fn test_mix() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "13", "%25%", "/0$/"])
        .succeeds()
        .stdout_only("27\n15\n63\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 13));
    assert_eq!(at.read("xx01"), generate(25, 30));
    assert_eq!(at.read("xx02"), generate(30, 51));
}

#[test]
fn test_option_keep() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["-k", "numbers50.txt", "/20/", "/nope/"])
        .fails()
        .stderr_is("csplit: error: '/nope/': match not found")
        .stdout_is("48\n93\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 20));
    assert_eq!(at.read("xx01"), generate(20, 51));
}

#[test]
fn test_option_quiet() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["--quiet", "numbers50.txt", "13", "%25%", "/0$/"])
        .succeeds()
        .no_stdout();

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 13));
    assert_eq!(at.read("xx01"), generate(25, 30));
    assert_eq!(at.read("xx02"), generate(30, 51));
}

#[test]
fn test_option_prefix() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["--prefix", "dog", "numbers50.txt", "13", "%25%", "/0$/"])
        .succeeds()
        .stdout_only("27\n15\n63\n");

    let count = glob(&at.plus_as_string("dog*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("dog00"), generate(1, 13));
    assert_eq!(at.read("dog01"), generate(25, 30));
    assert_eq!(at.read("dog02"), generate(30, 51));
}

#[test]
fn test_negative_offset_at_start() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["-", "/a/-1", "{*}"])
        .pipe_in("\na\n")
        .succeeds()
        .stdout_only("0\n3\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), "");
    assert_eq!(at.read("xx01"), "\na\n");
}

#[test]
fn test_up_to_match_option_suppress_matched() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "--suppress-matched", "/0$/", "{*}"])
        .succeeds()
        .stdout_only("18\n27\n27\n27\n27\n0\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 6);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(11, 20));
    assert_eq!(at.read("xx02"), generate(21, 30));
    assert_eq!(at.read("xx03"), generate(31, 40));
    assert_eq!(at.read("xx04"), generate(41, 50));
    assert_eq!(at.read("xx05"), "");
}

#[test]
fn test_up_to_match_offset_option_suppress_matched() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "--suppress-matched", "/10/+4"])
        .succeeds()
        .stdout_only("27\n111\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 10) + &generate(11, 14));
    assert_eq!(at.read("xx01"), generate(14, 51));
}

#[test]
fn test_up_to_match_negative_offset_option_suppress_matched() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "--suppress-matched", "/10/-4"])
        .succeeds()
        .stdout_only("10\n128\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 6));
    assert_eq!(at.read("xx01"), generate(6, 10) + &generate(11, 51));
}

#[test]
fn test_up_to_line_option_suppress_matched() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "--suppress-matched", "10"])
        .succeeds()
        .stdout_only("18\n120\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(11, 51));
}

#[test]
fn test_skip_to_match_option_suppress_matched() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "--suppress-matched", "%0$%"])
        .succeeds()
        .stdout_only("120\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(11, 51));
}

#[test]
fn test_option_elide_empty_file1() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "--suppress-matched", "-z", "/0$/", "{*}"])
        .succeeds()
        .stdout_only("18\n27\n27\n27\n27\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 5);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(11, 20));
    assert_eq!(at.read("xx02"), generate(21, 30));
    assert_eq!(at.read("xx03"), generate(31, 40));
    assert_eq!(at.read("xx04"), generate(41, 50));
}

#[test]
fn test_option_elide_empty_file2() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["-", "-z", "/a/-1", "{*}"])
        .pipe_in("\na\n")
        .succeeds()
        .stdout_only("3\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), "\na\n");
}

#[test]
fn test_up_to_match_context_overflow() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/45/+10"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '/45/+10': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);
    let (at, mut ucmd) = at_and_ucmd!();

    ucmd.args(&["numbers50.txt", "/45/+10", "-k"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '/45/+10': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(1, 51));
}

#[test]
fn test_skip_to_match_context_underflow() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%5%-10"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '%5%-10': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%5%-10", "-k"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '%5%-10': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(1, 51));
}

#[test]
fn test_skip_to_match_context_overflow() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%45%+10"])
        .fails()
        .stderr_only("csplit: error: '%45%+10': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%45%+10", "-k"])
        .fails()
        .stderr_only("csplit: error: '%45%+10': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_up_to_no_match1() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/4/", "/nope/"])
        .fails()
        .stdout_is("6\n135\n")
        .stderr_is("csplit: error: '/nope/': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/4/", "/nope/", "-k"])
        .fails()
        .stdout_is("6\n135\n")
        .stderr_is("csplit: error: '/nope/': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 4));
    assert_eq!(at.read("xx01"), generate(4, 51));
}

#[test]
fn test_up_to_no_match2() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/4/", "/nope/", "{50}"])
        .fails()
        .stdout_is("6\n135\n")
        .stderr_is("csplit: error: '/nope/': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/4/", "/nope/", "{50}", "-k"])
        .fails()
        .stdout_is("6\n135\n")
        .stderr_is("csplit: error: '/nope/': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 4));
    assert_eq!(at.read("xx01"), generate(4, 51));
}

#[test]
fn test_up_to_no_match3() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/0$/", "{50}"])
        .fails()
        .stdout_is("18\n30\n30\n30\n30\n3\n")
        .stderr_is("csplit: error: '/0$/': match not found on repetition 5");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/0$/", "{50}", "-k"])
        .fails()
        .stdout_is("18\n30\n30\n30\n30\n3\n")
        .stderr_is("csplit: error: '/0$/': match not found on repetition 5");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 6);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(10, 20));
    assert_eq!(at.read("xx02"), generate(20, 30));
    assert_eq!(at.read("xx03"), generate(30, 40));
    assert_eq!(at.read("xx04"), generate(40, 50));
    assert_eq!(at.read("xx05"), "50\n");
}

#[test]
fn test_up_to_no_match4() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/nope/", "/4/"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '/nope/': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/nope/", "/4/", "-k"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '/nope/': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(1, 51));
}

#[test]
fn test_up_to_no_match5() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/nope/", "{*}"])
        .succeeds()
        .stdout_only("141\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(1, 51));
}

#[test]
fn test_up_to_no_match6() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/nope/-5"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '/nope/-5': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/nope/-5", "-k"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '/nope/-5': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(1, 51));
}

#[test]
fn test_up_to_no_match7() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/nope/+5"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '/nope/+5': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/nope/+5", "-k"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '/nope/+5': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(1, 51));
}

#[test]
fn test_skip_to_no_match1() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%nope%"])
        .fails()
        .stderr_only("csplit: error: '%nope%': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_skip_to_no_match2() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%nope%", "{50}"])
        .fails()
        .stderr_only("csplit: error: '%nope%': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_skip_to_no_match3() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%0$%", "{50}"])
        .fails()
        .stderr_only("csplit: error: '%0$%': match not found on repetition 5");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_skip_to_no_match4() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%nope%", "/4/"])
        .fails()
        .stderr_only("csplit: error: '%nope%': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_skip_to_no_match5() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%nope%", "{*}"])
        .succeeds()
        .no_stderr()
        .no_stdout();

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_skip_to_no_match6() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%nope%-5"])
        .fails()
        .stderr_only("csplit: error: '%nope%-5': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_skip_to_no_match7() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%nope%+5"])
        .fails()
        .stderr_only("csplit: error: '%nope%+5': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_no_match() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "%nope%"])
        .fails()
        .stderr_only("csplit: error: '%nope%': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/nope/"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '/nope/': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_too_small_linenum() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/20/", "10", "/40/"])
        .succeeds()
        .stdout_only("48\n0\n60\n33\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 4);
    assert_eq!(at.read("xx00"), generate(1, 20));
    assert_eq!(at.read("xx01"), "");
    assert_eq!(at.read("xx02"), generate(20, 40));
    assert_eq!(at.read("xx03"), generate(40, 51));
}

#[test]
fn test_too_small_linenum_equal() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/20/", "20"])
        .succeeds()
        .stdout_only("48\n0\n93\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 20));
    assert_eq!(at.read("xx01"), "");
    assert_eq!(at.read("xx02"), generate(20, 51));
}

#[test]
fn test_too_small_linenum_elided() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "-z", "/20/", "10", "/40/"])
        .succeeds()
        .stdout_only("48\n60\n33\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 20));
    assert_eq!(at.read("xx01"), generate(20, 40));
    assert_eq!(at.read("xx02"), generate(40, 51));
}

#[test]
fn test_too_small_linenum_negative_offset() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/20/-5", "10", "/40/"])
        .succeeds()
        .stdout_only("33\n0\n75\n33\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 4);
    assert_eq!(at.read("xx00"), generate(1, 15));
    assert_eq!(at.read("xx01"), "");
    assert_eq!(at.read("xx02"), generate(15, 40));
    assert_eq!(at.read("xx03"), generate(40, 51));
}

#[test]
fn test_too_small_linenum_twice() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/20/", "10", "15", "/40/"])
        .succeeds()
        .stdout_only("48\n0\n0\n60\n33\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 5);
    assert_eq!(at.read("xx00"), generate(1, 20));
    assert_eq!(at.read("xx01"), "");
    assert_eq!(at.read("xx02"), "");
    assert_eq!(at.read("xx03"), generate(20, 40));
    assert_eq!(at.read("xx04"), generate(40, 51));
}

#[test]
fn test_too_small_linenum_repeat() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/20/", "10", "{*}"])
        .fails()
        .stderr_is("csplit: error: '10': line number out of range on repetition 5")
        .stdout_is("48\n0\n0\n30\n30\n30\n3\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/20/", "10", "{*}", "-k"])
        .fails()
        .stderr_is("csplit: error: '10': line number out of range on repetition 5")
        .stdout_is("48\n0\n0\n30\n30\n30\n3\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 7);
    assert_eq!(at.read("xx00"), generate(1, 20));
    assert_eq!(at.read("xx01"), "");
    assert_eq!(at.read("xx02"), "");
    assert_eq!(at.read("xx03"), generate(20, 30));
    assert_eq!(at.read("xx04"), generate(30, 40));
    assert_eq!(at.read("xx05"), generate(40, 50));
    assert_eq!(at.read("xx06"), "50\n");
}

#[test]
fn test_linenum_out_of_range1() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "100"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '100': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "100", "-k"])
        .fails()
        .stdout_is("141\n")
        .stderr_is("csplit: error: '100': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 1);
    assert_eq!(at.read("xx00"), generate(1, 51));
}

#[test]
fn test_linenum_out_of_range2() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "10", "100"])
        .fails()
        .stdout_is("18\n123\n")
        .stderr_is("csplit: error: '100': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "10", "100", "-k"])
        .fails()
        .stdout_is("18\n123\n")
        .stderr_is("csplit: error: '100': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(10, 51));
}

#[test]
fn test_linenum_out_of_range3() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "40", "{2}"])
        .fails()
        .stdout_is("108\n33\n")
        .stderr_is("csplit: error: '40': line number out of range on repetition 1");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "40", "{2}", "-k"])
        .fails()
        .stdout_is("108\n33\n")
        .stderr_is("csplit: error: '40': line number out of range on repetition 1");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 40));
    assert_eq!(at.read("xx01"), generate(40, 51));
}

#[test]
fn test_linenum_out_of_range4() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "40", "{*}"])
        .fails()
        .stdout_is("108\n33\n")
        .stderr_is("csplit: error: '40': line number out of range on repetition 1");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "40", "{*}", "-k"])
        .fails()
        .stdout_is("108\n33\n")
        .stderr_is("csplit: error: '40': line number out of range on repetition 1");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 40));
    assert_eq!(at.read("xx01"), generate(40, 51));
}

#[test]
fn test_skip_to_match_negative_offset_before_a_match() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/20/-10", "/15/"])
        .fails()
        .stdout_is("18\n123\n")
        .stderr_is("csplit: error: '/15/': match not found");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_skip_to_match_negative_offset_before_a_linenum() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/20/-10", "15"])
        .succeeds()
        .stdout_only("18\n15\n108\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(10, 15));
    assert_eq!(at.read("xx02"), generate(15, 51));
}

#[test]
fn test_corner_case1() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/10/", "11"])
        .succeeds()
        .stdout_only("18\n3\n120\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), "10\n");
    assert_eq!(at.read("xx02"), generate(11, 51));
}

#[test]
fn test_corner_case2() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/10/-5", "/10/"])
        .fails()
        .stderr_is("csplit: error: '/10/': match not found")
        .stdout_is("8\n133\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_corner_case3() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/15/-3", "14", "/15/"])
        .fails()
        .stderr_is("csplit: error: '/15/': match not found")
        .stdout_is("24\n6\n111\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 0);
}

#[test]
fn test_corner_case4() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/20/-10", "/30/-4"])
        .succeeds()
        .stdout_only("18\n48\n75\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(10, 26));
    assert_eq!(at.read("xx02"), generate(26, 51));
}

// NOTE: differs from gnu's output: the empty split is not written
#[test]
fn test_up_to_match_context_underflow() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/5/-10"])
        .fails()
        .stdout_is("0\n141\n")
        .stderr_is("csplit: error: '/5/-10': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/5/-10", "-k"])
        .fails()
        .stdout_is("0\n141\n")
        .stderr_is("csplit: error: '/5/-10': line number out of range");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("counting splits")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), "");
    assert_eq!(at.read("xx01"), generate(1, 51));
}

// the offset is out of range because of the first pattern
// NOTE: output different than gnu's: the empty split is written but the rest of the input file is not
#[test]
fn test_linenum_range_with_up_to_match1() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "10", "/12/-5"])
        .fails()
        .stderr_is("csplit: error: '/12/-5': line number out of range")
        .stdout_is("18\n0\n123\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "10", "/12/-5", "-k"])
        .fails()
        .stderr_is("csplit: error: '/12/-5': line number out of range")
        .stdout_is("18\n0\n123\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), "");
    assert_eq!(at.read("xx02"), generate(10, 51));
}

// the offset is out of range because more lines are needed than physically available
// NOTE: output different than gnu's: the empty split is not written but the rest of the input file is
#[test]
fn test_linenum_range_with_up_to_match2() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "10", "/12/-15"])
        .fails()
        .stderr_is("csplit: error: '/12/-15': line number out of range")
        .stdout_is("18\n0\n123\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 0);

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "10", "/12/-15", "-k"])
        .fails()
        .stderr_is("csplit: error: '/12/-15': line number out of range")
        .stdout_is("18\n0\n123\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), "");
    assert_eq!(at.read("xx02"), generate(10, 51));
}

// NOTE: output different than gnu's: the pattern /10/ is matched but should not
#[test]
fn test_linenum_range_with_up_to_match3() {
    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "10", "/10/", "-k"])
        .fails()
        .stderr_is("csplit: error: '/10/': match not found")
        .stdout_is("18\n123\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 2);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), generate(10, 51));

    let (at, mut ucmd) = at_and_ucmd!();
    ucmd.args(&["numbers50.txt", "/10/", "10"])
        .succeeds()
        .stdout_only("18\n0\n123\n");

    let count = glob(&at.plus_as_string("xx*"))
        .expect("there should be splits created")
        .count();
    assert_eq!(count, 3);
    assert_eq!(at.read("xx00"), generate(1, 10));
    assert_eq!(at.read("xx01"), "");
    assert_eq!(at.read("xx02"), generate(10, 51));
}
