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use crate::{Headers, Row};
use csv::WriterBuilder;
use std::fs::{self, File};
use std::io;
use std::path::PathBuf;
pub trait Target {
fn write_headers(&mut self, headers: &Headers) -> Result<(), csv::Error>;
fn write_row(&mut self, row: &Row) -> Result<(), csv::Error>;
}
pub struct PathTarget {
path: PathBuf,
writer: Option<csv::Writer<File>>,
}
impl PathTarget {
pub fn new<P: Into<PathBuf>>(path: P) -> Self {
Self {
path: path.into(),
writer: None,
}
}
}
impl Target for PathTarget {
fn write_headers(&mut self, headers: &Headers) -> Result<(), csv::Error> {
if let Some(parent) = self.path.parent() {
fs::create_dir_all(parent)?;
}
self.writer = Some(csv::Writer::from_path(&self.path)?);
self.write_row(headers.get_row())
}
fn write_row(&mut self, row: &Row) -> Result<(), csv::Error> {
self.writer.as_mut().unwrap().write_record(row)?;
Ok(())
}
}
pub struct StdoutTarget {
writer: Option<csv::Writer<io::Stdout>>,
}
impl StdoutTarget {
pub fn new() -> Self {
Self { writer: None }
}
}
impl Target for StdoutTarget {
fn write_headers(&mut self, headers: &Headers) -> Result<(), csv::Error> {
let writer = WriterBuilder::new().from_writer(io::stdout());
self.writer = Some(writer);
self.write_row(headers.get_row())?;
Ok(())
}
fn write_row(&mut self, row: &Row) -> Result<(), csv::Error> {
self.writer.as_mut().unwrap().write_record(row)?;
Ok(())
}
}
pub struct StderrTarget {
writer: Option<csv::Writer<io::Stderr>>,
}
impl StderrTarget {
pub fn new() -> Self {
Self { writer: None }
}
}
impl Target for StderrTarget {
fn write_headers(&mut self, headers: &Headers) -> Result<(), csv::Error> {
let writer = WriterBuilder::new().from_writer(io::stderr());
self.writer = Some(writer);
self.write_row(headers.get_row())
}
fn write_row(&mut self, row: &Row) -> Result<(), csv::Error> {
self.writer.as_mut().unwrap().write_record(row)?;
Ok(())
}
}
pub struct StringWriter<'a> {
s: &'a mut String,
}
impl<'a> io::Write for StringWriter<'a> {
fn write(&mut self, buf: &[u8]) -> io::Result<usize> {
match std::str::from_utf8(buf) {
Ok(s) => {
self.s.push_str(s);
Ok(buf.len())
}
Err(e) => Err(io::Error::new(io::ErrorKind::InvalidData, e)),
}
}
fn flush(&mut self) -> io::Result<()> {
Ok(())
}
}
pub struct StringTarget<'a> {
writer: csv::Writer<StringWriter<'a>>,
}
impl<'a> StringTarget<'a> {
pub fn new(s: &'a mut String) -> Self {
let writer = WriterBuilder::new().from_writer(StringWriter { s });
Self { writer }
}
}
impl<'a> Target for StringTarget<'a> {
fn write_headers(&mut self, headers: &Headers) -> Result<(), csv::Error> {
self.write_row(headers.get_row())
}
fn write_row(&mut self, row: &Row) -> Result<(), csv::Error> {
self.writer.write_record(row)?;
Ok(())
}
}