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use std::path::{Path, PathBuf,}; use std::error::Error; use clap::{App, Arg, ArgGroup, }; pub fn app() -> App<'static, 'static> { App::new("rjoin") .author(crate_authors!()) .version(crate_version!()) .about("joins lines of two files with identical join fields.") .arg(Arg::with_name("show_left") .short("l") .long("show-left") .help("print the unmatched lines from the left file")) .arg(Arg::with_name("show_right") .short("r") .long("show-right") .help("print the unmatched lines from the right file")) .arg(Arg::with_name("show_both") .short("b") .long("show-both") .help("print the matched lines")) .group(ArgGroup::with_name("show_any") .args(&["show_left", "show_right", "show_both"]) .multiple(true)) .arg(Arg::with_name("header") .long("header") .help("treat the first line in each file as field headers, print them without trying to pair them")) .arg(Arg::with_name("key") .short("k") .long("key") .conflicts_with_all(&["left_key", "right_key"]) .takes_value(true) .min_values(1) .value_delimiter(",") .value_name("FIELDS") .help("equivalent to '--left-key=FIELDS --right-key=FIELDS'")) .arg(Arg::with_name("left_key") .long("left-key") .requires("right_key") .takes_value(true) .min_values(1) .value_delimiter(",") .value_name("FIELDS") .help("join on these comma-separated fields in the left file") .long_help( "join on these comma-separated fields in the left file. The index starts with one and must not contain duplicates. The default is 1.")) .arg(Arg::with_name("right_key") .long("right-key") .requires("left_key") .takes_value(true) .min_values(1) .value_delimiter(",") .value_name("FIELDS") .help("join on these comma-separated fields in the right file") .long_help( "join on these comma-separated fields in the right file. The index starts with one and must not contain duplicates. The default is 1.")) .arg(Arg::with_name("delimiter") .long("delimiter") .short("d") .takes_value(true) .value_name("CHAR") .conflicts_with("in_delimiter") .help("equivalent to '--in-delimiter=CHAR --out-delimiter=CHAR'")) .arg(Arg::with_name("in_delimiter") .long("in-delimiter") .takes_value(true) .value_name("CHAR") .requires("out_delimiter") .conflicts_with_all(&["in_left_delimiter", "in_right_delimiter"]) .help("equivalent to '--in-left-delimiter=CHAR --in-right-delimiter=CHAR'")) .arg(Arg::with_name("out_delimiter") .long("out-delimiter") .takes_value(true) .value_name("CHAR") .requires("in_delimiter") .help("use CHAR as output field delimiter") .long_help( "use CHAR as output field delimiter. It must be 1 byte long in utf-8.")) .arg(Arg::with_name("in_left_delimiter") .long("in-left-delimiter") .takes_value(true) .value_name("CHAR") .requires_all(&["in_right_delimiter", "out_delimiter"]) .help("use CHAR as input field delimiter for the left file") .long_help( "use CHAR as input field delimiter for left file. It must be 1 byte long in utf-8.")) .arg(Arg::with_name("in_right_delimiter") .long("in-right-delimiter") .takes_value(true) .value_name("CHAR") .requires("in_left_delimiter") .help("use CHAR as input field delimiter for the right file") .long_help( "use CHAR as input field delimiter for the right file. It must be 1 byte long in utf-8.")) .arg(Arg::with_name("terminator") .long("terminator") .short("t") .takes_value(true) .value_name("CHAR") .conflicts_with("in_terminator") .help("equivalent to '--in-terminator=CHAR --out-terminator=CHAR'")) .arg(Arg::with_name("in_terminator") .long("in-terminator") .takes_value(true) .value_name("CHAR") .requires("out_terminator") .conflicts_with_all(&["in_left_terminator", "in_right_terminator"]) .help("equivalent to '--in-left-terminator=CHAR --in-right-terminator=CHAR'")) .arg(Arg::with_name("out_terminator") .long("out-terminator") .takes_value(true) .value_name("CHAR") .requires("in_terminator") .help("use CHAR as output record terminator") .long_help( "use CHAR as output record terminator. It must be 1 byte long in utf-8.")) .arg(Arg::with_name("in_left_terminator") .long("in-left-terminator") .takes_value(true) .value_name("CHAR") .requires_all(&["in_right_terminator", "out_terminator"]) .help("use CHAR as input record terminator for the left file") .long_help( "use CHAR as input record terminator for left file. It must be 1 byte long in utf-8.")) .arg(Arg::with_name("in_right_terminator") .long("in-right-terminator") .takes_value(true) .value_name("CHAR") .requires("in_left_terminator") .help("use CHAR as input record terminator for the right file") .long_help( "use CHAR as input record terminator for right file. It must be 1 byte long in utf-8.")) .arg(Arg::with_name("LEFT_FILE") .help("the left input file") .required(true) .index(1)) .arg(Arg::with_name("RIGHT_FILE") .help("the right input file") .required(true) .index(2)) } pub struct Args { left_path: PathBuf, right_path: PathBuf, show_left: bool, show_right: bool, show_both: bool, left_key: Vec<usize>, right_key: Vec<usize>, in_left_delimiter: u8, in_right_delimiter: u8, out_delimiter: u8, in_left_terminator: u8, in_right_terminator: u8, out_terminator: u8, header: bool, } impl Args { pub fn parse() -> Result<Args, Box<Error>> { let matches = app().get_matches(); let left_path = matches.value_of("LEFT_FILE").ok_or("expected LEFT_FILE")?; let right_path = matches.value_of("RIGHT_FILE").ok_or("expected RIGHT_FILE")?; let show_left = matches.is_present("show_left"); let show_right = matches.is_present("show_right"); let show_both = !matches.is_present("show_any") || matches.is_present("show_both"); let header = matches.is_present("header"); let key: Vec<usize> = match matches.values_of("key").map(|it| it.collect::<Vec<_>>()) { Some(v) => validate_key(v, "")?, None => vec![0], }; let left_key: Vec<usize> = match matches.values_of("left_key") .map(|it| it.collect::<Vec<_>>()) { Some(v) => validate_key(v, "left ")?, None => key.clone(), }; let right_key: Vec<usize> = match matches.values_of("right_key") .map(|it| it.collect::<Vec<_>>()) { Some(v) => validate_key(v, "right ")?, None => key.clone(), }; if left_key.len() != right_key.len() { return Err("the left key and the right key parameters have different lenght".into()); } let delimiter = match matches.value_of("delimiter") .map(|s| s.as_bytes()) { Some(b) => { if b.len() > 1 { return Err("the field delimiter must be 1 byte long in utf8".into()); } b[0] } None => b',' }; let in_delimiter = match matches.value_of("in_delimiter") .map(|s| s.as_bytes()) { Some(b) => { if b.len() > 1 { return Err("the input field delimiter must be 1 byte long in utf8".into()); } b[0] } None => delimiter }; let out_delimiter = match matches.value_of("out_delimiter") .map(|s| s.as_bytes()) { Some(b) => { if b.len() > 1 { return Err("the output field delimiter must be 1 byte long in utf8".into()); } b[0] } None => delimiter }; let in_left_delimiter = match matches.value_of("in_left_delimiter") .map(|s| s.as_bytes()) { Some(b) => { if b.len() > 1 { return Err("the left input field delimiter must be 1 byte long in utf8".into()); } b[0] } None => in_delimiter }; let in_right_delimiter = match matches.value_of("in_right_delimiter") .map(|s| s.as_bytes()) { Some(b) => { if b.len() > 1 { return Err("the right input field delimiter must be 1 byte long in utf8".into()); } b[0] } None => in_delimiter }; let terminator = match matches.value_of("terminator") .map(|s| s.as_bytes()) { Some(b) => { if b.len() > 1 { return Err("the record terminator must be 1 byte long in utf8".into()); } b[0] } None => b'\n' }; let in_terminator = match matches.value_of("in_terminator") .map(|s| s.as_bytes()) { Some(b) => { if b.len() > 1 { return Err("the input record terminator must be 1 byte long in utf8".into()); } b[0] } None => terminator }; let out_terminator = match matches.value_of("out_terminator") .map(|s| s.as_bytes()) { Some(b) => { if b.len() > 1 { return Err("the output record terminator must be 1 byte long in utf8".into()); } b[0] } None => terminator }; let in_left_terminator = match matches.value_of("in_left_terminator") .map(|s| s.as_bytes()) { Some(b) => { if b.len() > 1 { return Err("the left input record terminator must be 1 byte long in \ utf8".into()); } b[0] } None => in_terminator }; let in_right_terminator = match matches.value_of("in_right_terminator") .map(|s| s.as_bytes()) { Some(b) => { if b.len() > 1 { return Err("the right input record terminator must be 1 byte long in \ utf8".into()); } b[0] } None => in_terminator }; let args = Args { left_path: left_path.into(), right_path: right_path.into(), show_left: show_left, show_right: show_right, show_both: show_both, left_key: left_key, right_key: right_key, in_left_delimiter: in_left_delimiter, in_right_delimiter: in_right_delimiter, out_delimiter: out_delimiter, in_left_terminator: in_left_terminator, in_right_terminator: in_right_terminator, out_terminator: out_terminator, header: header, }; Ok(args) } pub fn left_path(&self) -> &Path { &self.left_path } pub fn right_path(&self) -> &Path { &self.right_path } pub fn show_left(&self) -> bool { self.show_left } pub fn show_right(&self) -> bool { self.show_right } pub fn show_both(&self) -> bool { self.show_both } pub fn left_key(&self) -> &[usize] { &self.left_key } pub fn right_key(&self) -> &[usize] { &self.right_key } pub fn in_left_delimiter(&self) -> u8 { self.in_left_delimiter } pub fn in_right_delimiter(&self) -> u8 { self.in_right_delimiter } pub fn out_delimiter(&self) -> u8 { self.out_delimiter } pub fn in_left_terminator(&self) -> u8 { self.in_left_terminator } pub fn in_right_terminator(&self) -> u8 { self.in_right_terminator } pub fn out_terminator(&self) -> u8 { self.out_terminator } pub fn header(&self) -> bool { self.header } } fn validate_key(k: Vec<&str>, which: &str) -> Result<Vec<usize>, Box<Error>> { let out = Ok(k) .map(|v| v.iter().map(|s| s.parse::<usize>()) .collect::<Vec<_>>()) .and_then(|v| { let mut out: Vec<usize> = Vec::with_capacity(v.len()); for (x, r) in v.iter().enumerate() { match *r { Ok(i) => out.push(i), Err(_) => return Err(format!("could not parse the {}key parameter at \ the position {}", which, x + 1).into()), } } Ok(out) }) .and_then(|mut v| { if v.iter().any(|&i| i < 1) { return Err("the key fields must use 1-based numbering".into()); } for i in v.iter_mut() { *i -= 1; } Ok(v) }); out }