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table.rs
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table.rs
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static USAGE: &str = r#"
Outputs CSV data as a table with columns in alignment.
This will not work well if the CSV data contains large fields.
Note that formatting a table requires buffering all CSV data into memory.
Therefore, you should use the 'sample' or 'slice' command to trim down large
CSV data before formatting it with this command.
Usage:
qsv table [options] [<input>]
qsv table --help
table options:
-w, --width <arg> The minimum width of each column.
[default: 2]
-p, --pad <arg> The minimum number of spaces between each column.
[default: 2]
-a, --align <arg> How entries should be aligned in a column.
Options: "left", "right", "center".
[default: left]
-c, --condense <arg> Limits the length of each field to the value
specified. If the field is UTF-8 encoded, then
<arg> refers to the number of code points.
Otherwise, it refers to the number of bytes.
Common options:
-h, --help Display this message
-o, --output <file> Write output to <file> instead of stdout.
-d, --delimiter <arg> The field delimiter for reading CSV data.
Must be a single character. (default: ,)
--memcheck Check if there is enough memory to load the entire
CSV into memory using CONSERVATIVE heuristics.
"#;
use std::borrow::Cow;
use serde::Deserialize;
use tabwriter::{Alignment, TabWriter};
use crate::{
config::{Config, Delimiter},
util, CliResult,
};
#[derive(Deserialize)]
struct Args {
arg_input: Option<String>,
flag_width: usize,
flag_pad: usize,
flag_output: Option<String>,
flag_delimiter: Option<Delimiter>,
flag_align: Align,
flag_condense: Option<usize>,
flag_memcheck: bool,
}
#[derive(Deserialize, Clone, Copy)]
enum Align {
Left,
Right,
Center,
}
impl From<Align> for Alignment {
fn from(align: Align) -> Self {
match align {
Align::Left => Alignment::Left,
Align::Right => Alignment::Right,
Align::Center => Alignment::Center,
}
}
}
pub fn run(argv: &[&str]) -> CliResult<()> {
let args: Args = util::get_args(USAGE, argv)?;
let rconfig = Config::new(&args.arg_input)
.delimiter(args.flag_delimiter)
.no_headers(true)
.flexible(true);
// we're loading the entire file into memory, we need to check avail mem
if let Some(path) = rconfig.path.clone() {
util::mem_file_check(&path, false, args.flag_memcheck)?;
}
let wconfig = Config::new(&args.flag_output).delimiter(Some(Delimiter(b'\t')));
let tw = TabWriter::new(wconfig.io_writer()?)
.minwidth(args.flag_width)
.padding(args.flag_pad)
.alignment(args.flag_align.into());
let mut wtr = wconfig.from_writer(tw);
let mut rdr = rconfig.reader()?;
let mut record = csv::ByteRecord::new();
while rdr.read_byte_record(&mut record)? {
wtr.write_record(
record
.iter()
.map(|f| util::condense(Cow::Borrowed(f), args.flag_condense)),
)?;
}
Ok(wtr.flush()?)
}