static USAGE: &str = r#"
Rename the columns of CSV data efficiently.
This command lets you rename the columns in CSV data. You must specify
all of the headers, and separate them by a comma.
Change the name of the columns:
$ qsv rename id,name,title
Use column names that contains commas and conflict with the separator:
$ qsv rename '"Date - Opening","Date - Actual Closing"'
For more examples, see https://github.com/jqnatividad/qsv/blob/master/tests/test_rename.rs.
Usage:
qsv rename [options] [--] <headers> [<input>]
qsv rename --help
Common options:
-h, --help Display this message
-o, --output <file> Write output to <file> instead of stdout.
-n, --no-headers When set, the header will be inserted on top.
-d, --delimiter <arg> The field delimiter for reading CSV data.
Must be a single character. (default: ,)
"#;
use serde::Deserialize;
use crate::{
config::{Config, Delimiter},
util, CliResult,
};
#[derive(Deserialize)]
struct Args {
arg_input: Option<String>,
arg_headers: String,
flag_output: Option<String>,
flag_no_headers: bool,
flag_delimiter: Option<Delimiter>,
}
pub fn run(argv: &[&str]) -> CliResult<()> {
let args: Args = util::get_args(USAGE, argv)?;
let rconfig = Config::new(&args.arg_input)
.checkutf8(false)
.delimiter(args.flag_delimiter)
.no_headers(args.flag_no_headers);
let mut rdr = rconfig.reader()?;
let mut wtr = Config::new(&args.flag_output).writer()?;
let headers = rdr.byte_headers()?;
let mut new_rdr = csv::Reader::from_reader(args.arg_headers.as_bytes());
let new_headers = new_rdr.byte_headers()?;
if headers.len() != new_headers.len() {
return fail_clierror!(
"The length of the CSV headers ({}) is different from the provided one ({}).",
headers.len(),
new_headers.len()
);
}
wtr.write_record(new_headers)?;
let mut record = csv::ByteRecord::new();
while rdr.read_byte_record(&mut record)? {
wtr.write_record(&record)?;
}
wtr.flush()?;
Ok(())
}