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
use nu_engine::CallExt;
use nu_protocol::{
ast::Call,
engine::{Command, EngineState, Stack},
Category, Example, PipelineData, ShellError, Signature, Span, Spanned, SyntaxShape, Value,
};
#[derive(Clone)]
pub struct SubCommand;
impl Command for SubCommand {
fn name(&self) -> &str {
"split column"
}
fn signature(&self) -> Signature {
Signature::build("split column")
.required(
"separator",
SyntaxShape::String,
"the character or string that denotes what separates columns",
)
.switch("collapse-empty", "remove empty columns", Some('c'))
.rest(
"rest",
SyntaxShape::String,
"column names to give the new columns",
)
.category(Category::Strings)
}
fn usage(&self) -> &str {
"Split a string into multiple columns using a separator"
}
fn search_terms(&self) -> Vec<&str> {
vec!["column", "separate", "divide"]
}
fn run(
&self,
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
split_column(engine_state, stack, call, input)
}
fn examples(&self) -> Vec<Example> {
vec![
Example {
description: "Split a string into columns by the specified separator",
example: "echo 'a--b--c' | split column '--'",
result: Some(Value::List {
vals: vec![Value::Record {
cols: vec![
"column1".to_string(),
"column2".to_string(),
"column3".to_string(),
],
vals: vec![
Value::test_string("a"),
Value::test_string("b"),
Value::test_string("c"),
],
span: Span::test_data(),
}],
span: Span::test_data(),
}),
},
Example {
description: "Split a string into columns of char and remove the empty columns",
example: "echo 'abc' | split column -c ''",
result: Some(Value::List {
vals: vec![Value::Record {
cols: vec![
"column1".to_string(),
"column2".to_string(),
"column3".to_string(),
],
vals: vec![
Value::test_string("a"),
Value::test_string("b"),
Value::test_string("c"),
],
span: Span::test_data(),
}],
span: Span::test_data(),
}),
},
]
}
}
fn split_column(
engine_state: &EngineState,
stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
let name_span = call.head;
let separator: Spanned<String> = call.req(engine_state, stack, 0)?;
let rest: Vec<Spanned<String>> = call.rest(engine_state, stack, 1)?;
let collapse_empty = call.has_flag("collapse-empty");
input.flat_map(
move |x| split_column_helper(&x, &separator, &rest, collapse_empty, name_span),
engine_state.ctrlc.clone(),
)
}
fn split_column_helper(
v: &Value,
separator: &Spanned<String>,
rest: &[Spanned<String>],
collapse_empty: bool,
head: Span,
) -> Vec<Value> {
if let Ok(s) = v.as_string() {
let split_result: Vec<_> = if collapse_empty {
s.split(&separator.item).filter(|s| !s.is_empty()).collect()
} else {
s.split(&separator.item).collect()
};
let positional: Vec<_> = rest.iter().map(|f| f.item.clone()).collect();
let mut cols = vec![];
let mut vals = vec![];
if positional.is_empty() {
let mut gen_columns = vec![];
for i in 0..split_result.len() {
gen_columns.push(format!("column{}", i + 1));
}
for (&k, v) in split_result.iter().zip(&gen_columns) {
cols.push(v.to_string());
vals.push(Value::string(k, head));
}
} else {
for (&k, v) in split_result.iter().zip(&positional) {
cols.push(v.into());
vals.push(Value::string(k, head));
}
}
vec![Value::Record {
cols,
vals,
span: head,
}]
} else {
match v.span() {
Ok(span) => vec![Value::Error {
error: ShellError::PipelineMismatch("string".into(), head, span),
}],
Err(error) => vec![Value::Error { error }],
}
}
}
