nu_command/generators/
seq_date.rs

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
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
use chrono::{Duration, Local, NaiveDate, NaiveDateTime};
use nu_engine::command_prelude::*;
use nu_protocol::FromValue;

use std::fmt::Write;

const NANOSECONDS_IN_DAY: i64 = 1_000_000_000i64 * 60i64 * 60i64 * 24i64;

#[derive(Clone)]
pub struct SeqDate;

impl Command for SeqDate {
    fn name(&self) -> &str {
        "seq date"
    }

    fn description(&self) -> &str {
        "Print sequences of dates."
    }

    fn signature(&self) -> nu_protocol::Signature {
        Signature::build("seq date")
            .input_output_types(vec![(Type::Nothing, Type::List(Box::new(Type::String)))])
            .named(
                "output-format",
                SyntaxShape::String,
                "prints dates in this format (defaults to %Y-%m-%d)",
                Some('o'),
            )
            .named(
                "input-format",
                SyntaxShape::String,
                "give argument dates in this format (defaults to %Y-%m-%d)",
                Some('i'),
            )
            .named(
                "begin-date",
                SyntaxShape::String,
                "beginning date range",
                Some('b'),
            )
            .named("end-date", SyntaxShape::String, "ending date", Some('e'))
            .named(
                "increment",
                SyntaxShape::OneOf(vec![SyntaxShape::Duration, SyntaxShape::Int]),
                "increment dates by this duration (defaults to days if integer)",
                Some('n'),
            )
            .named(
                "days",
                SyntaxShape::Int,
                "number of days to print (ignored if periods is used)",
                Some('d'),
            )
            .named(
                "periods",
                SyntaxShape::Int,
                "number of periods to print",
                Some('p'),
            )
            .switch("reverse", "print dates in reverse", Some('r'))
            .category(Category::Generators)
    }

    fn examples(&self) -> Vec<Example> {
        vec![
            Example {
                description: "Return a list of the next 10 days in the YYYY-MM-DD format",
                example: "seq date --days 10",
                result: None,
            },
            Example {
                description: "Return the previous 10 days in the YYYY-MM-DD format",
                example: "seq date --days 10 --reverse",
                result: None,
            },
            Example {
                description:
                    "Return the previous 10 days, starting today, in the MM/DD/YYYY format",
                example: "seq date --days 10 -o '%m/%d/%Y' --reverse",
                result: None,
            },
            Example {
                description: "Return the first 10 days in January, 2020",
                example:
                    "seq date --begin-date '2020-01-01' --end-date '2020-01-10' --increment 1day",
                result: Some(Value::list(
                    vec![
                        Value::test_string("2020-01-01"),
                        Value::test_string("2020-01-02"),
                        Value::test_string("2020-01-03"),
                        Value::test_string("2020-01-04"),
                        Value::test_string("2020-01-05"),
                        Value::test_string("2020-01-06"),
                        Value::test_string("2020-01-07"),
                        Value::test_string("2020-01-08"),
                        Value::test_string("2020-01-09"),
                        Value::test_string("2020-01-10"),
                    ],
                    Span::test_data(),
                )),
            },
            Example {
                description: "Return the first 10 days in January, 2020 using --days flag",
                example:
                    "seq date --begin-date '2020-01-01' --days 10 --increment 1day",
                result: Some(Value::list(
                    vec![
                        Value::test_string("2020-01-01"),
                        Value::test_string("2020-01-02"),
                        Value::test_string("2020-01-03"),
                        Value::test_string("2020-01-04"),
                        Value::test_string("2020-01-05"),
                        Value::test_string("2020-01-06"),
                        Value::test_string("2020-01-07"),
                        Value::test_string("2020-01-08"),
                        Value::test_string("2020-01-09"),
                        Value::test_string("2020-01-10"),
                    ],
                    Span::test_data(),
                )),
            },
            Example {
                description: "Return the first five 5-minute periods starting January 1, 2020",
                example:
                    "seq date --begin-date '2020-01-01' --periods 5 --increment 5min --output-format '%Y-%m-%d %H:%M:%S'",
                result: Some(Value::list(
                    vec![
                        Value::test_string("2020-01-01 00:00:00"),
                        Value::test_string("2020-01-01 00:05:00"),
                        Value::test_string("2020-01-01 00:10:00"),
                        Value::test_string("2020-01-01 00:15:00"),
                        Value::test_string("2020-01-01 00:20:00"),
                    ],
                    Span::test_data(),
                )),
            },
            Example {
                description: "print every fifth day between January 1st 2020 and January 31st 2020",
                example:
                    "seq date --begin-date '2020-01-01' --end-date '2020-01-31' --increment 5day",
                result: Some(Value::list(
                    vec![
                        Value::test_string("2020-01-01"),
                        Value::test_string("2020-01-06"),
                        Value::test_string("2020-01-11"),
                        Value::test_string("2020-01-16"),
                        Value::test_string("2020-01-21"),
                        Value::test_string("2020-01-26"),
                        Value::test_string("2020-01-31"),
                    ],
                    Span::test_data(),
                )),
            },
            Example {
                description: "increment defaults to days if no duration is supplied",
                example:
                    "seq date --begin-date '2020-01-01' --end-date '2020-01-31' --increment 5",
                result: Some(Value::list(
                    vec![
                        Value::test_string("2020-01-01"),
                        Value::test_string("2020-01-06"),
                        Value::test_string("2020-01-11"),
                        Value::test_string("2020-01-16"),
                        Value::test_string("2020-01-21"),
                        Value::test_string("2020-01-26"),
                        Value::test_string("2020-01-31"),
                    ],
                    Span::test_data(),
                )),
            },
            Example {
                description: "print every six hours starting January 1st, 2020 until January 3rd, 2020",
                example:
                    "seq date --begin-date '2020-01-01' --end-date '2020-01-03' --increment 6hr --output-format '%Y-%m-%d %H:%M:%S'",
                result: Some(Value::list(
                    vec![
                        Value::test_string("2020-01-01 00:00:00"),
                        Value::test_string("2020-01-01 06:00:00"),
                        Value::test_string("2020-01-01 12:00:00"),
                        Value::test_string("2020-01-01 18:00:00"),
                        Value::test_string("2020-01-02 00:00:00"),
                        Value::test_string("2020-01-02 06:00:00"),
                        Value::test_string("2020-01-02 12:00:00"),
                        Value::test_string("2020-01-02 18:00:00"),
                        Value::test_string("2020-01-03 00:00:00"),
                    ],
                    Span::test_data(),
                )),
            },
        ]
    }

    fn run(
        &self,
        engine_state: &EngineState,
        stack: &mut Stack,
        call: &Call,
        _input: PipelineData,
    ) -> Result<PipelineData, ShellError> {
        let output_format: Option<Spanned<String>> =
            call.get_flag(engine_state, stack, "output-format")?;
        let input_format: Option<Spanned<String>> =
            call.get_flag(engine_state, stack, "input-format")?;
        let begin_date: Option<Spanned<String>> =
            call.get_flag(engine_state, stack, "begin-date")?;
        let end_date: Option<Spanned<String>> = call.get_flag(engine_state, stack, "end-date")?;

        let increment = match call.get_flag::<Value>(engine_state, stack, "increment")? {
            Some(increment) => match increment {
                Value::Int { val, internal_span } => Some(
                    val.checked_mul(NANOSECONDS_IN_DAY)
                        .ok_or_else(|| ShellError::GenericError {
                            error: "increment is too large".into(),
                            msg: "increment is too large".into(),
                            span: Some(internal_span),
                            help: None,
                            inner: vec![],
                        })?
                        .into_spanned(internal_span),
                ),
                Value::Duration { val, internal_span } => Some(val.into_spanned(internal_span)),
                _ => None,
            },
            None => None,
        };

        let days: Option<Spanned<i64>> = call.get_flag(engine_state, stack, "days")?;
        let periods: Option<Spanned<i64>> = call.get_flag(engine_state, stack, "periods")?;
        let reverse = call.has_flag(engine_state, stack, "reverse")?;

        let out_format = match output_format {
            Some(s) => Some(Value::string(s.item, s.span)),
            _ => None,
        };

        let in_format = match input_format {
            Some(s) => Some(Value::string(s.item, s.span)),
            _ => None,
        };

        let begin = match begin_date {
            Some(s) => Some(s.item),
            _ => None,
        };

        let end = match end_date {
            Some(s) => Some(s.item),
            _ => None,
        };

        let inc = match increment {
            Some(i) => Value::int(i.item, i.span),
            _ => Value::int(NANOSECONDS_IN_DAY, call.head),
        };

        let day_count = days.map(|i| Value::int(i.item, i.span));

        let period_count = periods.map(|i| Value::int(i.item, i.span));

        let mut rev = false;
        if reverse {
            rev = reverse;
        }

        Ok(run_seq_dates(
            out_format,
            in_format,
            begin,
            end,
            inc,
            day_count,
            period_count,
            rev,
            call.head,
        )?
        .into_pipeline_data())
    }
}

#[allow(clippy::unnecessary_lazy_evaluations)]
pub fn parse_date_string(s: &str, format: &str) -> Result<NaiveDateTime, &'static str> {
    NaiveDateTime::parse_from_str(s, format).or_else(|_| {
        // If parsing as DateTime fails, try parsing as Date before throwing error
        let date = NaiveDate::parse_from_str(s, format).map_err(|_| "Failed to parse date.")?;
        date.and_hms_opt(0, 0, 0)
            .ok_or_else(|| "Failed to convert NaiveDate to NaiveDateTime.")
    })
}

#[allow(clippy::too_many_arguments)]
pub fn run_seq_dates(
    output_format: Option<Value>,
    input_format: Option<Value>,
    beginning_date: Option<String>,
    ending_date: Option<String>,
    increment: Value,
    day_count: Option<Value>,
    period_count: Option<Value>,
    reverse: bool,
    call_span: Span,
) -> Result<Value, ShellError> {
    let today = Local::now().naive_local();
    // if cannot convert , it will return error
    let increment_span = increment.span();
    let mut step_size: i64 = i64::from_value(increment)?;

    if step_size == 0 {
        return Err(ShellError::GenericError {
            error: "increment cannot be 0".into(),
            msg: "increment cannot be 0".into(),
            span: Some(increment_span),
            help: None,
            inner: vec![],
        });
    }

    let in_format = match input_format {
        Some(i) => match i.coerce_into_string() {
            Ok(v) => v,
            Err(e) => {
                return Err(ShellError::GenericError {
                    error: e.to_string(),
                    msg: "".into(),
                    span: None,
                    help: Some("error with input_format as_string".into()),
                    inner: vec![],
                });
            }
        },
        _ => "%Y-%m-%d".to_string(),
    };

    let out_format = match output_format {
        Some(o) => match o.coerce_into_string() {
            Ok(v) => v,
            Err(e) => {
                return Err(ShellError::GenericError {
                    error: e.to_string(),
                    msg: "".into(),
                    span: None,
                    help: Some("error with output_format as_string".into()),
                    inner: vec![],
                });
            }
        },
        _ => "%Y-%m-%d".to_string(),
    };

    let start_date = match beginning_date {
        Some(d) => match parse_date_string(&d, &in_format) {
            Ok(nd) => nd,
            Err(e) => {
                return Err(ShellError::GenericError {
                    error: e.to_string(),
                    msg: "Failed to parse date".into(),
                    span: Some(call_span),
                    help: None,
                    inner: vec![],
                })
            }
        },
        _ => today,
    };

    let mut end_date = match ending_date {
        Some(d) => match parse_date_string(&d, &in_format) {
            Ok(nd) => nd,
            Err(e) => {
                return Err(ShellError::GenericError {
                    error: e.to_string(),
                    msg: "Failed to parse date".into(),
                    span: Some(call_span),
                    help: None,
                    inner: vec![],
                })
            }
        },
        _ => today,
    };

    let mut days_to_output = match day_count {
        Some(d) => i64::from_value(d)?,
        None => 0i64,
    };

    let mut periods_to_output = match period_count {
        Some(d) => i64::from_value(d)?,
        None => 0i64,
    };

    // Make the signs opposite if we're created dates in reverse direction
    if reverse {
        step_size *= -1;
        days_to_output *= -1;
        periods_to_output *= -1;
    }

    // --days is ignored when --periods is set
    if periods_to_output != 0 {
        end_date = periods_to_output
            .checked_sub(1)
            .and_then(|val| val.checked_mul(step_size.abs()))
            .map(Duration::nanoseconds)
            .and_then(|inc| start_date.checked_add_signed(inc))
            .ok_or_else(|| ShellError::GenericError {
                error: "incrementing by the number of periods is too large".into(),
                msg: "incrementing by the number of periods is too large".into(),
                span: Some(call_span),
                help: None,
                inner: vec![],
            })?;
    } else if days_to_output != 0 {
        end_date = days_to_output
            .checked_sub(1)
            .and_then(Duration::try_days)
            .and_then(|days| start_date.checked_add_signed(days))
            .ok_or_else(|| ShellError::GenericError {
                error: "int value too large".into(),
                msg: "int value too large".into(),
                span: Some(call_span),
                help: None,
                inner: vec![],
            })?;
    }

    // conceptually counting down with a positive step or counting up with a negative step
    // makes no sense, attempt to do what one means by inverting the signs in those cases.
    if (start_date > end_date) && (step_size > 0) || (start_date < end_date) && step_size < 0 {
        step_size = -step_size;
    }

    let is_out_of_range =
        |next| (step_size > 0 && next > end_date) || (step_size < 0 && next < end_date);

    // Bounds are enforced by i64 conversion above
    let step_size = Duration::nanoseconds(step_size);

    let mut next = start_date;
    if is_out_of_range(next) {
        return Err(ShellError::GenericError {
            error: "date is out of range".into(),
            msg: "date is out of range".into(),
            span: Some(call_span),
            help: None,
            inner: vec![],
        });
    }

    let mut ret = vec![];
    loop {
        let mut date_string = String::new();
        match write!(date_string, "{}", next.format(&out_format)) {
            Ok(_) => {}
            Err(e) => {
                return Err(ShellError::GenericError {
                    error: "Invalid output format".into(),
                    msg: e.to_string(),
                    span: Some(call_span),
                    help: None,
                    inner: vec![],
                });
            }
        }
        ret.push(Value::string(date_string, call_span));
        if let Some(n) = next.checked_add_signed(step_size) {
            next = n;
        } else {
            return Err(ShellError::GenericError {
                error: "date overflow".into(),
                msg: "adding the increment overflowed".into(),
                span: Some(call_span),
                help: None,
                inner: vec![],
            });
        }

        if is_out_of_range(next) {
            break;
        }
    }

    Ok(Value::list(ret, call_span))
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_examples() {
        use crate::test_examples;

        test_examples(SeqDate {})
    }
}