Sniffer - a tool to quickly inspect csv and flat-file files for basic information

Related tags

Command-line sniffer
Overview

sniffer

sniffer is a tool to quickly inspect csv and flat-file files for basic information.

Need to see how many rows are in a csv file? Want to see the first few rows printed out to your terminal?

Then sniffer is for you!

sniffer is built with Rust and is made for the average Data Engineering or data person who frequently need to inspect csv files quicky.

The follow data is displayed about a flat file by default.

  • file size in mb.
  • number of lines per file.
  • header row is displayed.
  • First few rows are printed.
  • Option to indciate of flat-file is quoted.
  • Option to check all columns for NULL values.
  • Option to check for whitespace and beginning and end of columns.

Usage

Usage: sniffer [OPTIONS] --file-path  --delimiter 

Options:
      --file-path 
      --delimiter 
      --quote           [default: 0]
      --check-nulls             [default: 1]
      --check-whitespace   [default: 1]
  -h, --help                   Print help
  -V, --version                Print version

To use sniffer to inspect a flat-file simply pass the file-path and delimiter. cargo run -- --file-path sample.csv --delimiter , --quote 1 --check-nulls 1 This will give you output something like ...

Headers: StringRecord(["ride_id", "rideable_type", "started_at", "ended_at", "start_station_name", "start_station_id", "end_station_name", "end_station_id", "start_lat", "start_lng", "end_lat", "end_lng", "member_casual"])

'Row: StringRecord(["CBCD0D7777F0E45F", "classic_bike", "2023-02-14 11:59:42", "2023-02-14 12:13:38", "Southport Ave & Clybourn Ave", "TA1309000030", "Clark St & Schiller St", "TA1309000024", "41.920771", "-87.663712", "41.907993", "-87.631501", "casual"])

'Row: StringRecord(["F3EC5FCE5FF39DE9", "electric_bike", "2023-02-15 13:53:48", "2023-02-15 13:59:08", "Clarendon Ave & Gordon Ter", "13379", "Sheridan Rd & Lawrence Ave", "TA1309000041", "41.957879424", "-87.649583697", "41.969517", "-87.654691", "casual"])

'Row: StringRecord(["E54C1F27FA9354FF", "classic_bike", "2023-02-19 11:10:57", "2023-02-19 11:35:01", "Southport Ave & Clybourn Ave", "TA1309000030", "Aberdeen St & Monroe St", "13156", "41.920771", "-87.663712", "41.880419", "-87.655519", "member"])

number of lines: 4
No columns with nulls
No columns with whitespace at beginning or end
File size in MB: 0.001027107238769531

Testing and CI, Building.

To run pre-commit checks ... pre-commit run --all-files

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Comments
  • Enhance function read_number_lines_in_file with Error handling and Unit tests

    Enhance function read_number_lines_in_file with Error handling and Unit tests

    Problem

    Function read_number_lines_in_file panics and this will break the application in the run time

    Enhancement

    • Implement Err propagation & handling in the lib.rs for function read_number_lines_in_file, So it now returns a Result enum. So now anyone uses the library will have the option to deal with errors the way they like - Panics, Continue etc
    • Implement Unit tests for the function read_number_lines_in_file

    Code Example

    pub fn read_number_lines_in_file(file_path: &str) -> Result<u32,Box<dyn Error>> {
    let mut count: u32 = 0;
    let file: fs::File = std::fs::File::open(file_path)?;
    let bf: BufReader<fs::File> = BufReader::new(file);
    for _ in bf.lines() {
        count += 1;
    }
    Ok(count)
}
    opened by M-Farag 2
  • Update function has_whitespace_at_beginning_or_end

    Update function has_whitespace_at_beginning_or_end

    PR Description

    • Enhancements to the function has_whitespace_at_beginning_or_end
      • Simplifying the white space checking
      • Improving the error handling with clear error messages
      • Propagating errors to the function caller using the Result enum for better error handling
      • Adding unit tests against the function to test different use cases and check the results
      • Adding simple validation against the string length
      • Adding function documentation

    Code snippet

    fn has_whitespace_at_beginning_or_end(s: &str) -> Result<bool,&'static str> {

    if s.len() == 0 {
        return Ok(false);
    }

    let c = s.chars().take(1).last().expect("Error getting first character");
    if c.is_whitespace()  {
        return Ok(true);
    }
    let c = s.chars().rev().take(1).last().expect("Error getting last character");
    if c.is_whitespace() {
        return Ok(true);
    }
    
    Ok(false)
}
    opened by M-Farag 0
Owner
Daniel B
Data Engineer. Data lover. Data warehouse expert. Python and SQL are the spice of life.
Daniel B
GitHub
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