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
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
use crate::prelude::*;
use nu_engine::WholeStreamCommand;
use nu_errors::ShellError;
use nu_protocol::{Signature, UntaggedValue};
pub struct Uniq;
impl WholeStreamCommand for Uniq {
fn name(&self) -> &str {
"uniq"
}
fn signature(&self) -> Signature {
Signature::build("uniq")
.switch("count", "Count the unique rows", Some('c'))
.switch(
"repeated",
"Count the rows that has more than one value",
Some('d'),
)
.switch(
"ignore-case",
"Ignore differences in case when comparing",
Some('i'),
)
.switch("unique", "Only return unique values", Some('u'))
}
fn usage(&self) -> &str {
"Return the unique rows."
}
fn run_with_actions(&self, args: CommandArgs) -> Result<ActionStream, ShellError> {
uniq(args)
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Remove duplicate rows of a list/table",
example: "echo [2 3 3 4] | uniq",
result: Some(vec![
UntaggedValue::int(2).into(),
UntaggedValue::int(3).into(),
UntaggedValue::int(4).into(),
]),
},
Example {
description: "Only print duplicate lines, one for each group",
example: "echo [1 2 2] | uniq -d",
result: Some(vec![UntaggedValue::int(2).into()]),
},
Example {
description: "Only print unique lines lines",
example: "echo [1 2 2] | uniq -u",
result: Some(vec![UntaggedValue::int(1).into()]),
},
Example {
description: "Ignore differences in case when comparing",
example: "echo ['hello' 'goodbye' 'Hello'] | uniq -i",
result: Some(vec![
UntaggedValue::string("hello").into(),
UntaggedValue::string("goodbye").into(),
]),
},
Example {
description: "Remove duplicate rows and show counts of a list/table",
example: "echo [1 2 2] | uniq -c",
result: Some(vec![
UntaggedValue::row(indexmap! {
"value".to_string() => UntaggedValue::int(1).into(),
"count".to_string() => UntaggedValue::int(1).into(),
})
.into(),
UntaggedValue::row(indexmap! {
"value".to_string() => UntaggedValue::int(2).into(),
"count".to_string() => UntaggedValue::int(2).into(),
})
.into(),
]),
},
]
}
}
fn to_lowercase(value: nu_protocol::Value) -> nu_protocol::Value {
use nu_protocol::value::StringExt;
if value.is_string() {
value
.value
.expect_string()
.to_lowercase()
.to_string_value(value.tag)
} else {
value
}
}
fn uniq(args: CommandArgs) -> Result<ActionStream, ShellError> {
let should_show_count = args.has_flag("count");
let show_repeated = args.has_flag("repeated");
let ignore_case = args.has_flag("ignore-case");
let only_uniques = args.has_flag("unique");
let input = args.input;
let uniq_values = {
let mut counter = IndexMap::<nu_protocol::Value, usize>::new();
for line in input.into_vec() {
let item = if ignore_case {
to_lowercase(line)
} else {
line
};
*counter.entry(item).or_insert(0) += 1;
}
counter
};
let mut values = if show_repeated {
uniq_values.into_iter().filter(|i| i.1 > 1).collect::<_>()
} else {
uniq_values
};
if only_uniques {
values = values.into_iter().filter(|i| i.1 == 1).collect::<_>();
}
let mut values_vec_deque = VecDeque::new();
if should_show_count {
for item in values {
use nu_protocol::Value;
let value = {
match item.0.value {
UntaggedValue::Row(mut row) => {
row.entries.insert(
"count".to_string(),
UntaggedValue::int(item.1 as i64).into_untagged_value(),
);
Value {
value: UntaggedValue::Row(row),
tag: item.0.tag,
}
}
UntaggedValue::Primitive(p) => {
let mut map = IndexMap::<String, Value>::new();
map.insert(
"value".to_string(),
UntaggedValue::Primitive(p).into_untagged_value(),
);
map.insert(
"count".to_string(),
UntaggedValue::int(item.1 as i64).into_untagged_value(),
);
Value {
value: UntaggedValue::row(map),
tag: item.0.tag,
}
}
UntaggedValue::Table(_) => {
return Err(ShellError::labeled_error(
"uniq -c cannot operate on tables.",
"source",
item.0.tag.span,
))
}
#[cfg(feature = "dataframe")]
UntaggedValue::DataFrame(_) | UntaggedValue::FrameStruct(_) => {
return Err(ShellError::labeled_error(
"uniq -c cannot operate on data structs",
"source",
item.0.tag.span,
))
}
UntaggedValue::Error(_) | UntaggedValue::Block(_) => item.0,
}
};
values_vec_deque.push_back(value);
}
} else {
for item in values {
values_vec_deque.push_back(item.0);
}
}
Ok(values_vec_deque.into_iter().into_action_stream())
}
#[cfg(test)]
mod tests {
use super::ShellError;
use super::Uniq;
#[test]
fn examples_work_as_expected() -> Result<(), ShellError> {
use crate::examples::test as test_examples;
test_examples(Uniq {})
}
}
