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
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
use nu_protocol::ast::Call;
use nu_protocol::engine::{Command, EngineState, Stack};
use nu_protocol::{
Category, Example, IntoInterruptiblePipelineData, PipelineData, RawStream, ShellError,
Signature, Span, Value,
};
#[derive(Clone)]
pub struct Lines;
impl Command for Lines {
fn name(&self) -> &str {
"lines"
}
fn usage(&self) -> &str {
"Converts input to lines"
}
fn signature(&self) -> nu_protocol::Signature {
Signature::build("lines")
.switch("skip-empty", "skip empty lines", Some('s'))
.category(Category::Filters)
}
fn run(
&self,
engine_state: &EngineState,
_stack: &mut Stack,
call: &Call,
input: PipelineData,
) -> Result<nu_protocol::PipelineData, nu_protocol::ShellError> {
let head = call.head;
let ctrlc = engine_state.ctrlc.clone();
let skip_empty = call.has_flag("skip-empty");
match input {
#[allow(clippy::needless_collect)]
// Collect is needed because the string may not live long enough for
// the Rc structure to continue using it. If split could take ownership
// of the split values, then this wouldn't be needed
PipelineData::Value(Value::String { val, span }, ..) => {
let split_char = if val.contains("\r\n") { "\r\n" } else { "\n" };
let mut lines = val
.split(split_char)
.map(|s| s.to_string())
.collect::<Vec<String>>();
// if the last one is empty, remove it, as it was just
// a newline at the end of the input we got
if let Some(last) = lines.last() {
if last.is_empty() {
lines.pop();
}
}
let iter = lines.into_iter().filter_map(move |s| {
if skip_empty && s.trim().is_empty() {
None
} else {
Some(Value::string(s, span))
}
});
Ok(iter.into_pipeline_data(engine_state.ctrlc.clone()))
}
PipelineData::ListStream(stream, ..) => {
let mut split_char = "\n";
let iter = stream
.into_iter()
.filter_map(move |value| {
if let Value::String { val, span } = value {
if split_char != "\r\n" && val.contains("\r\n") {
split_char = "\r\n";
}
let mut lines = val
.split(split_char)
.filter_map(|s| {
if skip_empty && s.trim().is_empty() {
None
} else {
Some(s.to_string())
}
})
.collect::<Vec<_>>();
// if the last one is empty, remove it, as it was just
// a newline at the end of the input we got
if let Some(last) = lines.last() {
if last.is_empty() {
lines.pop();
}
}
Some(
lines
.into_iter()
.map(move |x| Value::String { val: x, span }),
)
} else {
None
}
})
.flatten();
Ok(iter.into_pipeline_data(engine_state.ctrlc.clone()))
}
PipelineData::Value(val, ..) => Err(ShellError::UnsupportedInput(
format!("Not supported input: {}", val.as_string()?),
head,
)),
PipelineData::ExternalStream { stdout: None, .. } => Ok(PipelineData::new(head)),
PipelineData::ExternalStream {
stdout: Some(stream),
..
} => Ok(RawStreamLinesAdapter::new(stream, head, skip_empty)
.into_iter()
.enumerate()
.map(move |(_idx, x)| match x {
Ok(x) => x,
Err(err) => Value::Error { error: err },
})
.into_pipeline_data(ctrlc)),
}
}
fn examples(&self) -> Vec<Example> {
vec![Example {
description: "Split multi-line string into lines",
example: "echo $'two(char nl)lines' | lines",
result: Some(Value::List {
vals: vec![Value::test_string("two"), Value::test_string("lines")],
span: Span::test_data(),
}),
}]
}
}
#[derive(Debug)]
struct RawStreamLinesAdapter {
inner: RawStream,
inner_complete: bool,
skip_empty: bool,
span: Span,
incomplete_line: String,
queue: Vec<String>,
}
impl Iterator for RawStreamLinesAdapter {
type Item = Result<Value, ShellError>;
fn next(&mut self) -> Option<Self::Item> {
loop {
if !self.queue.is_empty() {
let s = self.queue.remove(0usize);
if self.skip_empty && s.trim().is_empty() {
continue;
}
return Some(Ok(Value::String {
val: s,
span: self.span,
}));
} else {
// inner is complete, feed out remaining state
if self.inner_complete {
if !self.incomplete_line.is_empty() {
let r = Some(Ok(Value::String {
val: self.incomplete_line.to_string(),
span: self.span,
}));
self.incomplete_line = String::new();
return r;
}
return None;
}
// pull more data from inner
if let Some(result) = self.inner.next() {
match result {
Ok(v) => {
match v {
Value::String { val, span } => {
self.span = span;
let split_char =
if val.contains("\r\n") { "\r\n" } else { "\n" };
let mut lines = val
.split(split_char)
.map(|s| s.to_string())
.collect::<Vec<_>>();
// handle incomplete line from previous
if !self.incomplete_line.is_empty() {
if let Some(first) = lines.first() {
let new_incomplete_line =
self.incomplete_line.to_string() + first;
lines.splice(0..1, vec![new_incomplete_line]);
self.incomplete_line = String::new();
}
}
// store incomplete line from current
if let Some(last) = lines.last() {
if last.is_empty() {
// we ended on a line ending
lines.pop();
} else {
// incomplete line, save for next time
if let Some(s) = lines.pop() {
self.incomplete_line = s;
}
}
}
// save completed lines
self.queue.append(&mut lines);
}
// TODO: Value::Binary support required?
_ => {
return Some(Err(ShellError::UnsupportedInput(
"Unsupport type from raw stream".to_string(),
self.span,
)))
}
}
}
Err(_) => todo!(),
}
} else {
self.inner_complete = true;
}
}
}
}
}
impl RawStreamLinesAdapter {
pub fn new(inner: RawStream, span: Span, skip_empty: bool) -> Self {
Self {
inner,
span,
skip_empty,
incomplete_line: String::new(),
queue: Vec::<String>::new(),
inner_complete: false,
}
}
}