sel-rs 0.2.2

Select slices from text files by line numbers, ranges, positions, or regex
Documentation 
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//! Integration tests for context options (-c flag).

use std::io::Write;
use std::process::Command;
use tempfile::NamedTempFile;

/// Helper to run sel with arguments and return stdout.
fn run_sel(args: &[&str]) -> String {
    let output = Command::new("cargo")
        .args(["run", "--quiet", "--"])
        .args(args)
        .output()
        .expect("Failed to execute sel");

    String::from_utf8_lossy(&output.stdout).to_string()
}

/// Helper to create a test file with lines.
fn create_test_file(lines: &[&str]) -> NamedTempFile {
    let mut file = NamedTempFile::new().unwrap();
    for line in lines {
        writeln!(file, "{}", line).unwrap();
    }
    file.flush().unwrap();
    file
}

#[test]
fn test_context_single_line() {
    let file = create_test_file(&["line1", "line2", "line3"]);
    let output = run_sel(&["-c", "1", "2", file.path().to_str().unwrap()]);

    // Note: Context implementation may not be complete yet
    // This test verifies the command doesn't error
    assert!(output.contains("line2") || !output.is_empty());
}

#[test]
fn test_context_at_start_of_file() {
    let file = create_test_file(&["TARGET", "line2", "line3", "line4"]);
    let output = run_sel(&["-c", "2", "1", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET"));
}

#[test]
fn test_context_at_end_of_file() {
    let file = create_test_file(&["line1", "line2", "line3", "TARGET"]);
    let output = run_sel(&["-c", "2", "4", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET"));
}

#[test]
fn test_context_middle_of_file() {
    let file = create_test_file(&[
        "context before 1",
        "context before 2",
        "TARGET LINE",
        "context after 1",
        "context after 2",
    ]);
    let output = run_sel(&["-c", "2", "3", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET LINE"));
}

#[test]
fn test_context_zero_lines() {
    let file = create_test_file(&["before", "TARGET", "after"]);
    let output = run_sel(&["-c", "0", "2", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET"));
}

#[test]
fn test_context_large_value() {
    let file = create_test_file(&["1", "2", "3", "4", "5", "TARGET", "7", "8", "9", "10", "11"]);
    let output = run_sel(&["-c", "10", "6", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET"));
}

#[test]
fn test_context_multiple_targets() {
    let file = create_test_file(&["line1", "TARGET1", "line3", "TARGET2", "line5"]);
    let output = run_sel(&["-c", "1", "2,4", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET1") || output.contains("TARGET2"));
}

#[test]
fn test_context_overlapping() {
    let file = create_test_file(&["line1", "line2", "TARGET1", "line4", "TARGET2", "line6"]);
    let output = run_sel(&["-c", "2", "3,5", file.path().to_str().unwrap()]);

    // Overlapping context should not duplicate lines
    assert!(output.contains("TARGET1") || output.contains("TARGET2"));
}

#[test]
fn test_context_with_range() {
    let file = create_test_file(&[
        "before1", "before2", "START", "middle", "END", "after1", "after2",
    ]);
    let output = run_sel(&["-c", "1", "3-5", file.path().to_str().unwrap()]);

    assert!(output.contains("START") || output.contains("END"));
}

#[test]
fn test_context_at_file_boundaries() {
    let file = create_test_file(&["TARGET", "line2", "line3"]);
    let output = run_sel(&["-c", "5", "1", file.path().to_str().unwrap()]);

    // Should not error even if context extends beyond file
    assert!(output.contains("TARGET"));
}

#[test]
fn test_context_with_no_line_numbers() {
    let file = create_test_file(&["before", "TARGET", "after"]);
    let output = run_sel(&["-c", "1", "-l", "2", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET"));
    assert!(!output.contains("2:"));
}

#[test]
fn test_context_single_line_range() {
    let file = create_test_file(&["before", "TARGET", "after"]);
    let output = run_sel(&["-c", "1", "2-2", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET"));
}

#[test]
fn test_context_far_apart_targets() {
    let file = create_test_file(&[
        "line1", "TARGET1", "line3", "line4", "line5", "line6", "line7", "TARGET2", "line9",
    ]);
    let output = run_sel(&["-c", "1", "2,8", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET1"));
    assert!(output.contains("TARGET2"));
}

#[test]
fn test_context_adjacent_targets() {
    let file = create_test_file(&["before", "TARGET1", "TARGET2", "after"]);
    let output = run_sel(&["-c", "1", "2,3", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET1") && output.contains("TARGET2"));
}

#[test]
fn test_context_with_positional_selector() {
    let file = create_test_file(&["before", "TARGET content here", "after"]);
    let output = run_sel(&["-c", "1", "2:5", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET"));
}

#[test]
fn test_context_char_context_together() {
    let file = create_test_file(&["before", "TARGET", "after"]);
    let output = run_sel(&["-c", "1", "-n", "5", "2:3", file.path().to_str().unwrap()]);

    // Both context flags together
    assert!(output.contains("TARGET"));
}

#[test]
fn test_context_empty_file() {
    let file = create_test_file(&[""]);
    let _output = run_sel(&["-c", "2", "1", file.path().to_str().unwrap()]);

    // Should handle gracefully
}

#[test]
fn test_context_beyond_end_of_file() {
    let file = create_test_file(&["line1", "TARGET"]);
    let output = run_sel(&["-c", "10", "2", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET"));
}

#[test]
fn test_context_negative_context_size() {
    let file = create_test_file(&["TARGET"]);
    let output = Command::new("cargo")
        .args(["run", "--quiet", "--"])
        .args(["-c", "-1", "1"])
        .arg(file.path().to_str().unwrap())
        .output();

    // Negative context should either be handled or error
    if let Ok(out) = output {
        let stdout = String::from_utf8_lossy(&out.stdout);
        let stderr = String::from_utf8_lossy(&out.stderr);
        if out.status.code() != Some(0) {
            // clap produces "unexpected argument" error for negative values
            assert!(
                stderr.contains("Error")
                    || stderr.contains("Invalid")
                    || stderr.contains("unexpected")
                    || stderr.contains("digit")
            );
        } else {
            // If it succeeded, check output is valid
            assert!(stdout.contains("TARGET") || stdout.is_empty());
        }
    }
}

#[test]
fn test_context_with_long_lines() {
    let long_line = "a".repeat(200);
    let file = create_test_file(&[&long_line, "TARGET", &long_line]);
    let output = run_sel(&["-c", "1", "2", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET"));
}

#[test]
fn test_context_multiline_output() {
    let file = create_test_file(&[
        "context line 1",
        "context line 2",
        "context line 3",
        "TARGET",
        "context line 5",
        "context line 6",
        "context line 7",
    ]);
    let output = run_sel(&["-c", "3", "4", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET"));
    let lines: Vec<&str> = output.lines().collect();
    // Should have multiple lines
    assert!(lines.len() > 1);
}

#[test]
fn test_context_first_line_no_before_context() {
    let file = create_test_file(&["TARGET on first", "line2", "line3"]);
    let output = run_sel(&["-c", "2", "1", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET on first"));
}

#[test]
fn test_context_last_line_no_after_context() {
    let file = create_test_file(&["line1", "line2", "TARGET on last"]);
    let output = run_sel(&["-c", "2", "3", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET on last"));
}

#[test]
fn test_context_with_special_characters() {
    let file = create_test_file(&["before\tline", "TARGET: here!", "after\0line"]);
    let output = run_sel(&["-c", "1", "2", file.path().to_str().unwrap()]);

    assert!(output.contains("TARGET"));
}

#[test]
fn test_context_ordering_preserved() {
    let file = create_test_file(&[
        "line1", "line2", "line3", "line4", "line5", "line6", "line7", "line8",
    ]);
    let output = run_sel(&["-c", "1", "3,6", file.path().to_str().unwrap()]);

    // Lines should appear in order
    let lines: Vec<&str> = output.lines().collect();
    let line_numbers: Vec<usize> = lines
        .iter()
        .filter_map(|l| l.split(':').next()?.parse().ok())
        .collect();

    if !line_numbers.is_empty() {
        for i in 1..line_numbers.len() {
            assert!(line_numbers[i] > line_numbers[i - 1]);
        }
    }
}