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
#[macro_use]
extern crate uucore;
use std::env;
use std::path::{Path, PathBuf};
use uucore::fs::{canonicalize, CanonicalizeMode};
static NAME: &str = "relpath";
static VERSION: &str = env!("CARGO_PKG_VERSION");
pub fn uumain(args: impl uucore::Args) -> i32 {
let args = args.collect_str();
let mut opts = getopts::Options::new();
opts.optflag("h", "help", "Show help and exit");
opts.optflag("V", "version", "Show version and exit");
opts.optopt(
"d",
"",
"If any of FROM and TO is not subpath of DIR, output absolute path instead of relative",
"DIR",
);
let matches = match opts.parse(&args[1..]) {
Ok(m) => m,
Err(f) => {
show_error!("{}", f);
show_usage(&opts);
return 1;
}
};
if matches.opt_present("V") {
version();
return 0;
}
if matches.opt_present("h") {
show_usage(&opts);
return 0;
}
if matches.free.is_empty() {
show_error!("Missing operand: TO");
println!("Try `{} --help` for more information.", NAME);
return 1;
}
let to = Path::new(&matches.free[0]);
let from = if matches.free.len() > 1 {
Path::new(&matches.free[1]).to_path_buf()
} else {
env::current_dir().unwrap()
};
let absto = canonicalize(to, CanonicalizeMode::Normal).unwrap();
let absfrom = canonicalize(from, CanonicalizeMode::Normal).unwrap();
if matches.opt_present("d") {
let base = Path::new(&matches.opt_str("d").unwrap()).to_path_buf();
let absbase = canonicalize(base, CanonicalizeMode::Normal).unwrap();
if !absto.as_path().starts_with(absbase.as_path())
|| !absfrom.as_path().starts_with(absbase.as_path())
{
println!("{}", absto.display());
return 0;
}
}
let mut suffix_pos = 0;
for (f, t) in absfrom.components().zip(absto.components()) {
if f == t {
suffix_pos += 1;
} else {
break;
}
}
let mut result = PathBuf::new();
absfrom
.components()
.skip(suffix_pos)
.map(|_| result.push(".."))
.last();
absto
.components()
.skip(suffix_pos)
.map(|x| result.push(x.as_os_str()))
.last();
println!("{}", result.display());
0
}
fn version() {
println!("{} {}", NAME, VERSION)
}
fn show_usage(opts: &getopts::Options) {
version();
println!();
println!("Usage:");
println!(" {} [-d DIR] TO [FROM]", NAME);
println!(" {} -V|--version", NAME);
println!(" {} -h|--help", NAME);
println!();
print!(
"{}",
opts.usage(
"Convert TO destination to the relative path from the FROM dir.\n\
If FROM path is omitted, current working dir will be used."
)
);
}