fastgrep 0.1.8

Fast parallel grep with SIMD-accelerated search and trigram indexing
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
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167

mod common;

use std::io::Write;
use std::process::Command;
use std::process::Stdio;

use common::*;
use tempfile::NamedTempFile;

// ============================================================
// Regression tests
// ============================================================

#[test]
fn multiple_matches_same_line_color() {
    let mut f = NamedTempFile::new().unwrap();
    writeln!(f, "test foo test bar test baz test qux test end").unwrap();
    writeln!(f, "no match here").unwrap();
    writeln!(f, "another test line with test in it").unwrap();
    f.flush().unwrap();
    let p = f.path().to_str().unwrap();

    let output = Command::new(fastgrep_bin())
        .args(["--no-cache", "--color=always", "-n", "test", p])
        .output()
        .expect("failed to run fastgrep");

    assert!(output.status.success(), "fastgrep crashed on multiple matches per line");
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert_eq!(stdout.lines().count(), 2, "expected 2 matching lines, got: {stdout}");
}

#[test]
fn multiple_matches_same_line_color_stdin() {
    let input = "test foo test bar test baz test qux test end\nno match\nanother test line\n";
    let mut child = Command::new(fastgrep_bin())
        .args(["--no-cache", "--color=always", "test"])
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .stderr(Stdio::piped())
        .spawn()
        .expect("failed to spawn fastgrep");
    child.stdin.take().unwrap().write_all(input.as_bytes()).unwrap();
    let output = child.wait_with_output().unwrap();

    assert!(output.status.success(), "fastgrep crashed on multiple matches per line via stdin");
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert_eq!(stdout.lines().count(), 2, "expected 2 matching lines, got: {stdout}");
}

// ============================================================
// Line truncation (fastgrep-specific)
// ============================================================

// Invalid counted repetition like `{0: 1}` should be treated as a literal
// brace (matching GNU grep ERE behavior), not raise a regex parse error.
#[test]
fn literal_braces_not_valid_repetition() {
    let input = "Ack block: AckData foo signatures: {0: 1} end\nno match\nAck block: AckData bar signatures: {0: 1} baz\n";

    let mut child = Command::new(fastgrep_bin())
        .args(["--no-cache", "--color=never", "-c", "Ack block: AckData.*signatures: {0: 1}"])
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .stderr(Stdio::piped())
        .spawn()
        .expect("failed to spawn fastgrep");
    child.stdin.take().unwrap().write_all(input.as_bytes()).unwrap();
    let output = child.wait_with_output().unwrap();

    assert!(
        output.status.success(),
        "fastgrep failed on literal-brace pattern: stderr={}",
        String::from_utf8_lossy(&output.stderr)
    );
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert_eq!(stdout.trim(), "2", "expected 2 matches, got: {stdout}");
}

// Valid counted repetitions must still work as regex quantifiers.
#[test]
fn valid_counted_repetition_still_works() {
    let input = "aa\naaa\naaaa\naaaaa\n";

    let mut child = Command::new(fastgrep_bin())
        .args(["--no-cache", "--color=never", "-c", "a{3,4}"])
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .stderr(Stdio::piped())
        .spawn()
        .expect("failed to spawn fastgrep");
    child.stdin.take().unwrap().write_all(input.as_bytes()).unwrap();
    let output = child.wait_with_output().unwrap();

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    assert_eq!(stdout.trim(), "3", "expected 3 matches (aaa, aaaa, aaaaa), got: {stdout}");
}

#[test]
fn truncate_long_lines() {
    let long_line = "x".repeat(500) + "MATCH" + &"y".repeat(600);
    let input = format!("{long_line}\nshort MATCH line\n");

    let mut child = Command::new(fastgrep_bin())
        .args(["--no-cache", "--color=never", "--max-line-len=100", "MATCH"])
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .stderr(Stdio::piped())
        .spawn()
        .expect("failed to spawn fastgrep");
    child.stdin.take().unwrap().write_all(input.as_bytes()).unwrap();
    let output = child.wait_with_output().unwrap();

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    let lines: Vec<&str> = stdout.lines().collect();
    assert_eq!(lines.len(), 2);
    assert!(lines[0].contains("[truncated"), "expected truncation message, got: {}", lines[0]);
    assert!(lines[0].len() < long_line.len(), "line was not truncated");
    assert!(!lines[1].contains("[truncated"), "short line should not be truncated");
    assert_eq!(lines[1], "short MATCH line");
}

#[test]
fn truncate_disabled_with_zero() {
    let long_line = "x".repeat(2000) + "MATCH";
    let input = format!("{long_line}\n");

    let mut child = Command::new(fastgrep_bin())
        .args(["--no-cache", "--color=never", "--max-line-len=0", "MATCH"])
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .stderr(Stdio::piped())
        .spawn()
        .expect("failed to spawn fastgrep");
    child.stdin.take().unwrap().write_all(input.as_bytes()).unwrap();
    let output = child.wait_with_output().unwrap();

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    let line = stdout.lines().next().unwrap();
    assert!(!line.contains("[truncated"), "should not truncate with max-line-len=0");
    assert_eq!(line.len(), 2005);
}

#[test]
fn truncate_via_env() {
    let long_line = "x".repeat(200) + "MATCH";
    let input = format!("{long_line}\n");

    let mut child = Command::new(fastgrep_bin())
        .args(["--no-cache", "--color=never", "MATCH"])
        .env("FASTGREP_MAX_LINE_LEN", "50")
        .stdin(Stdio::piped())
        .stdout(Stdio::piped())
        .stderr(Stdio::piped())
        .spawn()
        .expect("failed to spawn fastgrep");
    child.stdin.take().unwrap().write_all(input.as_bytes()).unwrap();
    let output = child.wait_with_output().unwrap();

    assert!(output.status.success());
    let stdout = String::from_utf8_lossy(&output.stdout);
    let line = stdout.lines().next().unwrap();
    assert!(line.contains("[truncated"), "expected truncation via env var");
}