use std::borrow::Cow;
use csv;
use tabwriter::TabWriter;
use CliResult;
use config::{Config, Delimiter};
use util;
static USAGE: &'static str = "
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:
xsv table [options] [<input>]
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]
-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: ,)
";
#[derive(Deserialize)]
struct Args {
arg_input: Option<String>,
flag_width: usize,
flag_pad: usize,
flag_output: Option<String>,
flag_delimiter: Option<Delimiter>,
flag_condense: Option<usize>,
}
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);
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);
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)
}))?;
}
wtr.flush()?;
Ok(())
}