#[allow(deprecated, unused_imports)]
use std::ascii::AsciiExt;
use std::borrow::ToOwned;
use std::env;
use std::fs;
use std::io::{self, Read};
use std::ops::Deref;
use std::path::PathBuf;
use csv;
use index::Indexed;
use serde::de::{Deserializer, Deserialize, Error};
use CliResult;
use select::{SelectColumns, Selection};
use util;
#[derive(Clone, Copy, Debug)]
pub struct Delimiter(pub u8);
impl Delimiter {
pub fn as_byte(self) -> u8 {
self.0
}
}
impl<'de> Deserialize<'de> for Delimiter {
fn deserialize<D: Deserializer<'de>>(d: D) -> Result<Delimiter, D::Error> {
let c = String::deserialize(d)?;
match &*c {
r"\t" => Ok(Delimiter(b'\t')),
s => {
if s.len() != 1 {
let msg = format!("Could not convert '{}' to a single \
ASCII character.", s);
return Err(D::Error::custom(msg));
}
let c = s.chars().next().unwrap();
if c.is_ascii() {
Ok(Delimiter(c as u8))
} else {
let msg = format!("Could not convert '{}' \
to ASCII delimiter.", c);
Err(D::Error::custom(msg))
}
}
}
}
}
#[derive(Debug)]
pub struct Config {
path: Option<PathBuf>, idx_path: Option<PathBuf>,
select_columns: Option<SelectColumns>,
delimiter: u8,
pub no_headers: bool,
flexible: bool,
terminator: csv::Terminator,
quote: u8,
quote_style: csv::QuoteStyle,
double_quote: bool,
escape: Option<u8>,
quoting: bool,
}
impl Config {
pub fn new(path: &Option<String>) -> Config {
let (path, delim) = match *path {
None => (None, b','),
Some(ref s) if s.deref() == "-" => (None, b','),
Some(ref s) => {
let path = PathBuf::from(s);
let delim =
if path.extension().map_or(false, |v| v == "tsv") {
b'\t'
} else {
b','
};
(Some(path), delim)
}
};
Config {
path: path,
idx_path: None,
select_columns: None,
delimiter: delim,
no_headers: false,
flexible: false,
terminator: csv::Terminator::Any(b'\n'),
quote: b'"',
quote_style: csv::QuoteStyle::Necessary,
double_quote: true,
escape: None,
quoting: true,
}
}
pub fn delimiter(mut self, d: Option<Delimiter>) -> Config {
if let Some(d) = d {
self.delimiter = d.as_byte();
}
self
}
pub fn no_headers(mut self, mut yes: bool) -> Config {
if env::var("XSV_TOGGLE_HEADERS").unwrap_or("0".to_owned()) == "1" {
yes = !yes;
}
self.no_headers = yes;
self
}
pub fn flexible(mut self, yes: bool) -> Config {
self.flexible = yes;
self
}
pub fn crlf(mut self, yes: bool) -> Config {
if yes {
self.terminator = csv::Terminator::CRLF;
} else {
self.terminator = csv::Terminator::Any(b'\n');
}
self
}
pub fn terminator(mut self, term: csv::Terminator) -> Config {
self.terminator = term;
self
}
pub fn quote(mut self, quote: u8) -> Config {
self.quote = quote;
self
}
pub fn quote_style(mut self, style: csv::QuoteStyle) -> Config {
self.quote_style = style;
self
}
pub fn double_quote(mut self, yes: bool) -> Config {
self.double_quote = yes;
self
}
pub fn escape(mut self, escape: Option<u8>) -> Config {
self.escape = escape;
self
}
pub fn quoting(mut self, yes: bool) -> Config {
self.quoting = yes;
self
}
pub fn select(mut self, sel_cols: SelectColumns) -> Config {
self.select_columns = Some(sel_cols);
self
}
pub fn is_std(&self) -> bool {
self.path.is_none()
}
pub fn selection(
&self,
first_record: &csv::ByteRecord,
) -> Result<Selection, String> {
match self.select_columns {
None => Err("Config has no 'SelectColums'. Did you call \
Config::select?".to_owned()),
Some(ref sel) => sel.selection(first_record, !self.no_headers),
}
}
pub fn write_headers<R: io::Read, W: io::Write>
(&self, r: &mut csv::Reader<R>, w: &mut csv::Writer<W>)
-> csv::Result<()> {
if !self.no_headers {
let r = r.byte_headers()?;
if !r.is_empty() {
w.write_record(r)?;
}
}
Ok(())
}
pub fn writer(&self)
-> io::Result<csv::Writer<Box<io::Write+'static>>> {
Ok(self.from_writer(self.io_writer()?))
}
pub fn reader(&self)
-> io::Result<csv::Reader<Box<io::Read+'static>>> {
Ok(self.from_reader(self.io_reader()?))
}
pub fn reader_file(&self) -> io::Result<csv::Reader<fs::File>> {
match self.path {
None => Err(io::Error::new(
io::ErrorKind::Other, "Cannot use <stdin> here",
)),
Some(ref p) => fs::File::open(p).map(|f| self.from_reader(f)),
}
}
pub fn index_files(&self)
-> io::Result<Option<(csv::Reader<fs::File>, fs::File)>> {
let (csv_file, idx_file) = match (&self.path, &self.idx_path) {
(&None, &None) => return Ok(None),
(&None, &Some(_)) => return Err(io::Error::new(
io::ErrorKind::Other,
"Cannot use <stdin> with indexes",
)),
(&Some(ref p), &None) => {
let idx_file = match fs::File::open(&util::idx_path(p)) {
Err(_) => return Ok(None),
Ok(f) => f,
};
(fs::File::open(p)?, idx_file)
}
(&Some(ref p), &Some(ref ip)) => {
(fs::File::open(p)?, fs::File::open(ip)?)
}
};
let data_modified = util::last_modified(&csv_file.metadata()?);
let idx_modified = util::last_modified(&idx_file.metadata()?);
if data_modified > idx_modified {
return Err(io::Error::new(
io::ErrorKind::Other,
"The CSV file was modified after the index file. \
Please re-create the index.",
));
}
let csv_rdr = self.from_reader(csv_file);
Ok(Some((csv_rdr, idx_file)))
}
pub fn indexed(&self)
-> CliResult<Option<Indexed<fs::File, fs::File>>> {
match self.index_files()? {
None => Ok(None),
Some((r, i)) => Ok(Some(Indexed::open(r, i)?)),
}
}
pub fn io_reader(&self) -> io::Result<Box<io::Read+'static>> {
Ok(match self.path {
None => Box::new(io::stdin()),
Some(ref p) => {
match fs::File::open(p){
Ok(x) => Box::new(x),
Err(err) => {
let msg = format!(
"failed to open {}: {}", p.display(), err);
return Err(io::Error::new(
io::ErrorKind::NotFound,
msg,
));
}
}
},
})
}
pub fn from_reader<R: Read>(&self, rdr: R) -> csv::Reader<R> {
csv::ReaderBuilder::new()
.flexible(self.flexible)
.delimiter(self.delimiter)
.has_headers(!self.no_headers)
.quote(self.quote)
.quoting(self.quoting)
.escape(self.escape)
.from_reader(rdr)
}
pub fn io_writer(&self) -> io::Result<Box<io::Write+'static>> {
Ok(match self.path {
None => Box::new(io::stdout()),
Some(ref p) => Box::new(fs::File::create(p)?),
})
}
pub fn from_writer<W: io::Write>(&self, wtr: W) -> csv::Writer<W> {
csv::WriterBuilder::new()
.flexible(self.flexible)
.delimiter(self.delimiter)
.terminator(self.terminator)
.quote(self.quote)
.quote_style(self.quote_style)
.double_quote(self.double_quote)
.escape(self.escape.unwrap_or(b'\\'))
.buffer_capacity(32 * (1<<10))
.from_writer(wtr)
}
}