tva 0.3.3

Tab-separated Values Assistant
Documentation 
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
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132

#[macro_use]
#[path = "common/mod.rs"]
mod common;

use common::TvaCmd;
use std::fs;
use test_case::test_case;

// ============================================================================
// Basic Reverse Tests
// ============================================================================

#[test_case("1\n2\n3\n", "3\n2\n1\n" ; "basic")]
#[test_case("", "" ; "empty")]
#[test_case("1", "1" ; "single_line_no_newline")]
#[test_case("1\n", "1\n" ; "single_line_with_newline")]
#[test_case("1\n2", "21\n" ; "two_lines_no_newline_at_end")]
fn reverse_basic(input: &str, expected: &str) {
    let (stdout, _) = TvaCmd::new().args(&["reverse"]).stdin(input).run();
    assert_eq!(stdout, expected);
}

// ============================================================================
// Header Mode Tests
// ============================================================================

#[test_case("H\n1\n2\n3\n", "H\n3\n2\n1\n" ; "header_basic")]
#[test_case("", "" ; "header_empty")]
#[test_case("Header\n", "Header\n" ; "header_single_line")]
#[test_case("Header\nData\n", "Header\nData\n" ; "header_two_lines")]
#[test_case("Header\n1\n2\n", "Header\n2\n1\n" ; "header_three_lines")]
fn reverse_header(input: &str, expected: &str) {
    let (stdout, _) = TvaCmd::new()
        .args(&["reverse", "--header"])
        .stdin(input)
        .run();
    assert_eq!(stdout, expected);
}

// ============================================================================
// Multi-File Tests
// ============================================================================

fn run_multi_file_test(file_contents: &[&str], extra_args: &[&str], expected: &str) {
    let temp_dir = tempfile::tempdir().unwrap();
    let file1_path = temp_dir.path().join("file1.tsv");
    let file2_path = temp_dir.path().join("file2.tsv");

    fs::write(&file1_path, file_contents[0]).unwrap();
    fs::write(&file2_path, file_contents[1]).unwrap();

    let mut args = vec!["reverse"];
    args.extend_from_slice(extra_args);
    args.push(file1_path.to_str().unwrap());
    args.push(file2_path.to_str().unwrap());

    let (stdout, _) = TvaCmd::new().args(&args).run();
    assert_eq!(stdout, expected);
}

#[test_case(&["1\n2\n", "3\n4\n"], &[], "2\n1\n4\n3\n" ; "basic")]
#[test_case(&["Header\n1\n", "2\n3\n"], &["--header"], "Header\n1\n3\n2\n" ; "with_header")]
#[test_case(&["", "Header\n1\n"], &["--header"], "Header\n1\n" ; "empty_first_file")]
fn reverse_multi_file(file_contents: &[&str], extra_args: &[&str], expected: &str) {
    run_multi_file_test(file_contents, extra_args, expected);
}

#[test]
fn reverse_mmap_fallback() {
    // Tests lines 138-152 in reverse.rs: fallback when mmap fails
    // We force this using the hidden --no-mmap flag
    let input = "1\n2\n3\n";
    let expected = "3\n2\n1\n";

    let temp_dir = tempfile::tempdir().unwrap();
    let file_path = temp_dir.path().join("fallback.tsv");
    fs::write(&file_path, input).unwrap();

    let (stdout, _) = TvaCmd::new()
        .args(&["reverse", "--no-mmap", file_path.to_str().unwrap()])
        .run();

    assert_eq!(stdout, expected);
}

// ============================================================================
// Header Hash1 Mode Tests
// ============================================================================

#[test_case("# Comment 1\n# Comment 2\nCol1\tCol2\n1\t2\n3\t4\n", "# Comment 1\n# Comment 2\nCol1\tCol2\n3\t4\n1\t2\n" ; "hash1_basic")]
#[test_case("Col1\tCol2\n1\t2\n3\t4\n", "Col1\tCol2\n3\t4\n1\t2\n" ; "hash1_no_hash_lines")]
#[test_case("# Comment\nCol1\tCol2\n1\t2\n", "# Comment\nCol1\tCol2\n1\t2\n" ; "hash1_single_hash")]
#[test_case("# Comment\nCol1\tCol2\n", "# Comment\nCol1\tCol2\n" ; "hash1_only_header")]
#[test_case("# Comment", "# Comment" ; "hash1_hash_no_newline")]
#[test_case("# Comment\nCol1\tCol2", "# Comment\nCol1\tCol2" ; "hash1_column_names_no_newline")]
#[test_case("# Comment 1\n# Comment 2\n", "# Comment 2\n# Comment 1\n" ; "hash1_only_hash_lines")]
fn reverse_header_hash1(input: &str, expected: &str) {
    let (stdout, _) = TvaCmd::new()
        .args(&["reverse", "--header-hash1"])
        .stdin(input)
        .run();
    assert_eq!(stdout, expected);
}

#[test]
fn reverse_header_hash1_multi_file() {
    // Multi-file with --header-hash1: only first file's header is used
    let file1_content = "# File1 Comment\nCol1\tCol2\n1\t2\n";
    let file2_content = "3\t4\n5\t6\n";

    let temp_dir = tempfile::tempdir().unwrap();
    let file1_path = temp_dir.path().join("file1.tsv");
    let file2_path = temp_dir.path().join("file2.tsv");

    fs::write(&file1_path, file1_content).unwrap();
    fs::write(&file2_path, file2_content).unwrap();

    let (stdout, _) = TvaCmd::new()
        .args(&[
            "reverse",
            "--header-hash1",
            file1_path.to_str().unwrap(),
            file2_path.to_str().unwrap(),
        ])
        .run();

    // file1: header printed, "1\t2\n" reversed -> "1\t2\n"
    // file2: header_printed=true, "3\t4\n5\t6\n" reversed -> "5\t6\n3\t4\n"
    let expected = "# File1 Comment\nCol1\tCol2\n1\t2\n5\t6\n3\t4\n";

    assert_eq!(stdout, expected);
}