1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
use clap::{crate_version, App, AppSettings, Arg};
use std::fs::File;
use std::io::{stdin, stdout, BufRead, BufReader, Read, Write};
use std::path::Path;
use uucore::error::{FromIo, UResult};
static ABOUT: &str = "Write lines consisting of the sequentially corresponding lines from each
FILE, separated by TABs, to standard output.";
mod options {
pub const DELIMITER: &str = "delimiters";
pub const SERIAL: &str = "serial";
pub const FILE: &str = "file";
}
fn read_line<R: Read>(
reader: Option<&mut BufReader<R>>,
buf: &mut String,
) -> std::io::Result<usize> {
match reader {
Some(reader) => reader.read_line(buf),
None => stdin().read_line(buf),
}
}
#[uucore::main]
pub fn uumain(args: impl uucore::Args) -> UResult<()> {
let matches = uu_app().get_matches_from(args);
let serial = matches.is_present(options::SERIAL);
let delimiters = matches.value_of(options::DELIMITER).unwrap();
let files = matches
.values_of(options::FILE)
.unwrap()
.map(|s| s.to_owned())
.collect();
paste(files, serial, delimiters)
}
pub fn uu_app<'a>() -> App<'a> {
App::new(uucore::util_name())
.version(crate_version!())
.about(ABOUT)
.setting(AppSettings::InferLongArgs)
.arg(
Arg::new(options::SERIAL)
.long(options::SERIAL)
.short('s')
.help("paste one file at a time instead of in parallel"),
)
.arg(
Arg::new(options::DELIMITER)
.long(options::DELIMITER)
.short('d')
.help("reuse characters from LIST instead of TABs")
.value_name("LIST")
.default_value("\t")
.hide_default_value(true),
)
.arg(
Arg::new(options::FILE)
.value_name("FILE")
.multiple_occurrences(true)
.default_value("-"),
)
}
fn paste(filenames: Vec<String>, serial: bool, delimiters: &str) -> UResult<()> {
let mut files = Vec::with_capacity(filenames.len());
for name in filenames {
let file = if name == "-" {
None
} else {
let path = Path::new(&name);
let r = File::open(path).map_err_context(String::new)?;
Some(BufReader::new(r))
};
files.push(file);
}
let delimiters: Vec<char> = unescape(delimiters).chars().collect();
let mut delim_count = 0;
let stdout = stdout();
let mut stdout = stdout.lock();
let mut output = String::new();
if serial {
for file in &mut files {
output.clear();
loop {
match read_line(file.as_mut(), &mut output) {
Ok(0) => break,
Ok(_) => {
if output.ends_with('\n') {
output.pop();
}
output.push(delimiters[delim_count % delimiters.len()]);
}
Err(e) => return Err(e.map_err_context(String::new)),
}
delim_count += 1;
}
output.pop();
writeln!(stdout, "{}", output)?;
}
} else {
let mut eof = vec![false; files.len()];
loop {
output.clear();
let mut eof_count = 0;
for (i, file) in files.iter_mut().enumerate() {
if eof[i] {
eof_count += 1;
} else {
match read_line(file.as_mut(), &mut output) {
Ok(0) => {
eof[i] = true;
eof_count += 1;
}
Ok(_) => {
if output.ends_with('\n') {
output.pop();
}
}
Err(e) => return Err(e.map_err_context(String::new)),
}
}
output.push(delimiters[delim_count % delimiters.len()]);
delim_count += 1;
}
if files.len() == eof_count {
break;
}
output.pop();
writeln!(stdout, "{}", output)?;
delim_count = 0;
}
}
Ok(())
}
fn unescape(s: &str) -> String {
s.replace("\\n", "\n")
.replace("\\t", "\t")
.replace("\\\\", "\\")
.replace('\\', "")
}