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Implement the Default trait for Params
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+48
-121
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1 file changed

+48
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‎src/params.rs‎

Lines changed: 48 additions & 121 deletions
Original file line numberDiff line numberDiff line change
@@ -2,16 +2,15 @@ use std::ffi::{OsStr, OsString};
22

33
use regex::Regex;
44

5-
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
5+
#[derive(Clone, Copy, Debug, Default, Eq, PartialEq)]
66
pub enum Format {
7+
#[default]
78
Normal,
89
Unified,
910
Context,
1011
Ed,
1112
}
1213

13-
const DEFAULT_TABSIZE: usize = 8;
14-
1514
#[cfg(unix)]
1615
fn osstr_bytes(osstr: &OsStr) -> &[u8] {
1716
use std::os::unix::ffi::OsStrExt;
@@ -35,22 +34,33 @@ pub struct Params {
3534
pub tabsize: usize,
3635
}
3736

37+
impl Default for Params {
38+
fn default() -> Self {
39+
Self {
40+
from: OsString::default(),
41+
to: OsString::default(),
42+
format: Format::default(),
43+
context_count: 3,
44+
report_identical_files: false,
45+
brief: false,
46+
expand_tabs: false,
47+
tabsize: 8,
48+
}
49+
}
50+
}
51+
3852
pub fn parse_params<I: IntoIterator<Item = OsString>>(opts: I) -> Result<Params, String> {
3953
let mut opts = opts.into_iter();
4054
// parse CLI
4155

4256
let Some(exe) = opts.next() else {
4357
return Err("Usage: <exe> <from> <to>".to_string());
4458
};
59+
let mut params = Params::default();
4560
let mut from = None;
4661
let mut to = None;
4762
let mut format = None;
48-
let mut context_count = 3;
49-
let mut report_identical_files = false;
50-
let mut brief = false;
51-
let mut expand_tabs = false;
5263
let tabsize_re = Regex::new(r"^--tabsize=(?<num>\d+)$").unwrap();
53-
let mut tabsize = DEFAULT_TABSIZE;
5464
while let Some(param) = opts.next() {
5565
if param == "--" {
5666
break;
@@ -66,15 +76,15 @@ pub fn parse_params<I: IntoIterator<Item = OsString>>(opts: I) -> Result<Params,
6676
continue;
6777
}
6878
if param == "-s" || param == "--report-identical-files" {
69-
report_identical_files = true;
79+
params.report_identical_files = true;
7080
continue;
7181
}
7282
if param == "-q" || param == "--brief" {
73-
brief = true;
83+
params.brief = true;
7484
continue;
7585
}
7686
if param == "-t" || param == "--expand-tabs" {
77-
expand_tabs = true;
87+
params.expand_tabs = true;
7888
continue;
7989
}
8090
if tabsize_re.is_match(param.to_string_lossy().as_ref()) {
@@ -87,7 +97,7 @@ pub fn parse_params<I: IntoIterator<Item = OsString>>(opts: I) -> Result<Params,
8797
.name("num")
8898
.unwrap()
8999
.as_str();
90-
tabsize = match tabsize_str.parse::<usize>() {
100+
params.tabsize = match tabsize_str.parse::<usize>() {
91101
Ok(num) => num,
92102
Err(_) => return Err(format!("invalid tabsize «{}»", tabsize_str)),
93103
};
@@ -101,10 +111,10 @@ pub fn parse_params<I: IntoIterator<Item = OsString>>(opts: I) -> Result<Params,
101111
while let Some(b) = bit.next() {
102112
match b {
103113
b'0'..=b'9' => {
104-
context_count = (b - b'0') as usize;
114+
params.context_count = (b - b'0') as usize;
105115
while let Some(b'0'..=b'9') = bit.peek() {
106-
context_count *= 10;
107-
context_count += (bit.next().unwrap() - b'0') as usize;
116+
params.context_count *= 10;
117+
params.context_count += (bit.next().unwrap() - b'0') as usize;
108118
}
109119
}
110120
b'c' => {
@@ -138,7 +148,7 @@ pub fn parse_params<I: IntoIterator<Item = OsString>>(opts: I) -> Result<Params,
138148
if let Some(context_count_maybe) =
139149
context_count_maybe.and_then(|x| x.parse().ok())
140150
{
141-
context_count = context_count_maybe;
151+
params.context_count = context_count_maybe;
142152
break;
143153
}
144154
return Err("Invalid context count".to_string());
@@ -154,31 +164,22 @@ pub fn parse_params<I: IntoIterator<Item = OsString>>(opts: I) -> Result<Params,
154164
return Err(format!("Usage: {} <from> <to>", exe.to_string_lossy()));
155165
}
156166
}
157-
let from = if let Some(from) = from {
167+
params.from = if let Some(from) = from {
158168
from
159169
} else if let Some(param) = opts.next() {
160170
param
161171
} else {
162172
return Err(format!("Usage: {} <from> <to>", exe.to_string_lossy()));
163173
};
164-
let to = if let Some(to) = to {
174+
params.to = if let Some(to) = to {
165175
to
166176
} else if let Some(param) = opts.next() {
167177
param
168178
} else {
169179
return Err(format!("Usage: {} <from> <to>", exe.to_string_lossy()));
170180
};
171-
let format = format.unwrap_or(Format::Normal);
172-
Ok(Params {
173-
from,
174-
to,
175-
format,
176-
context_count,
177-
report_identical_files,
178-
brief,
179-
expand_tabs,
180-
tabsize,
181-
})
181+
params.format = format.unwrap_or(Format::default());
182+
Ok(params)
182183
}
183184

184185
#[cfg(test)]
@@ -193,12 +194,7 @@ mod tests {
193194
Ok(Params {
194195
from: os("foo"),
195196
to: os("bar"),
196-
format: Format::Normal,
197-
context_count: 3,
198-
report_identical_files: false,
199-
brief: false,
200-
expand_tabs: false,
201-
tabsize: DEFAULT_TABSIZE,
197+
..Default::default()
202198
}),
203199
parse_params([os("diff"), os("foo"), os("bar")].iter().cloned())
204200
);
@@ -210,11 +206,7 @@ mod tests {
210206
from: os("foo"),
211207
to: os("bar"),
212208
format: Format::Ed,
213-
context_count: 3,
214-
report_identical_files: false,
215-
brief: false,
216-
expand_tabs: false,
217-
tabsize: DEFAULT_TABSIZE,
209+
..Default::default()
218210
}),
219211
parse_params([os("diff"), os("-e"), os("foo"), os("bar")].iter().cloned())
220212
);
@@ -227,10 +219,7 @@ mod tests {
227219
to: os("bar"),
228220
format: Format::Unified,
229221
context_count: 54,
230-
report_identical_files: false,
231-
brief: false,
232-
expand_tabs: false,
233-
tabsize: DEFAULT_TABSIZE,
222+
..Default::default()
234223
}),
235224
parse_params(
236225
[os("diff"), os("-u54"), os("foo"), os("bar")]
@@ -244,10 +233,7 @@ mod tests {
244233
to: os("bar"),
245234
format: Format::Unified,
246235
context_count: 54,
247-
report_identical_files: false,
248-
brief: false,
249-
expand_tabs: false,
250-
tabsize: DEFAULT_TABSIZE,
236+
..Default::default()
251237
}),
252238
parse_params(
253239
[os("diff"), os("-U54"), os("foo"), os("bar")]
@@ -261,10 +247,7 @@ mod tests {
261247
to: os("bar"),
262248
format: Format::Unified,
263249
context_count: 54,
264-
report_identical_files: false,
265-
brief: false,
266-
expand_tabs: false,
267-
tabsize: DEFAULT_TABSIZE,
250+
..Default::default()
268251
}),
269252
parse_params(
270253
[os("diff"), os("-U"), os("54"), os("foo"), os("bar")]
@@ -278,10 +261,7 @@ mod tests {
278261
to: os("bar"),
279262
format: Format::Context,
280263
context_count: 54,
281-
report_identical_files: false,
282-
brief: false,
283-
expand_tabs: false,
284-
tabsize: DEFAULT_TABSIZE,
264+
..Default::default()
285265
}),
286266
parse_params(
287267
[os("diff"), os("-c54"), os("foo"), os("bar")]
@@ -296,38 +276,25 @@ mod tests {
296276
Ok(Params {
297277
from: os("foo"),
298278
to: os("bar"),
299-
format: Format::Normal,
300-
context_count: 3,
301-
report_identical_files: false,
302-
brief: false,
303-
expand_tabs: false,
304-
tabsize: DEFAULT_TABSIZE,
279+
..Default::default()
305280
}),
306281
parse_params([os("diff"), os("foo"), os("bar")].iter().cloned())
307282
);
308283
assert_eq!(
309284
Ok(Params {
310285
from: os("foo"),
311286
to: os("bar"),
312-
format: Format::Normal,
313-
context_count: 3,
314287
report_identical_files: true,
315-
brief: false,
316-
expand_tabs: false,
317-
tabsize: DEFAULT_TABSIZE,
288+
..Default::default()
318289
}),
319290
parse_params([os("diff"), os("-s"), os("foo"), os("bar")].iter().cloned())
320291
);
321292
assert_eq!(
322293
Ok(Params {
323294
from: os("foo"),
324295
to: os("bar"),
325-
format: Format::Normal,
326-
context_count: 3,
327296
report_identical_files: true,
328-
brief: false,
329-
expand_tabs: false,
330-
tabsize: DEFAULT_TABSIZE,
297+
..Default::default()
331298
}),
332299
parse_params(
333300
[
@@ -347,38 +314,25 @@ mod tests {
347314
Ok(Params {
348315
from: os("foo"),
349316
to: os("bar"),
350-
format: Format::Normal,
351-
context_count: 3,
352-
report_identical_files: false,
353-
brief: false,
354-
expand_tabs: false,
355-
tabsize: 8,
317+
..Default::default()
356318
}),
357319
parse_params([os("diff"), os("foo"), os("bar")].iter().cloned())
358320
);
359321
assert_eq!(
360322
Ok(Params {
361323
from: os("foo"),
362324
to: os("bar"),
363-
format: Format::Normal,
364-
context_count: 3,
365-
report_identical_files: false,
366325
brief: true,
367-
expand_tabs: false,
368-
tabsize: 8,
326+
..Default::default()
369327
}),
370328
parse_params([os("diff"), os("-q"), os("foo"), os("bar")].iter().cloned())
371329
);
372330
assert_eq!(
373331
Ok(Params {
374332
from: os("foo"),
375333
to: os("bar"),
376-
format: Format::Normal,
377-
context_count: 3,
378-
report_identical_files: false,
379334
brief: true,
380-
expand_tabs: false,
381-
tabsize: 8,
335+
..Default::default()
382336
}),
383337
parse_params(
384338
[os("diff"), os("--brief"), os("foo"), os("bar"),]
@@ -393,12 +347,7 @@ mod tests {
393347
Ok(Params {
394348
from: os("foo"),
395349
to: os("bar"),
396-
format: Format::Normal,
397-
context_count: 3,
398-
report_identical_files: false,
399-
brief: false,
400-
expand_tabs: false,
401-
tabsize: DEFAULT_TABSIZE,
350+
..Default::default()
402351
}),
403352
parse_params([os("diff"), os("foo"), os("bar")].iter().cloned())
404353
);
@@ -407,12 +356,8 @@ mod tests {
407356
Ok(Params {
408357
from: os("foo"),
409358
to: os("bar"),
410-
format: Format::Normal,
411-
context_count: 3,
412-
report_identical_files: false,
413-
brief: false,
414359
expand_tabs: true,
415-
tabsize: DEFAULT_TABSIZE,
360+
..Default::default()
416361
}),
417362
parse_params(
418363
[os("diff"), os(option), os("foo"), os("bar")]
@@ -428,25 +373,16 @@ mod tests {
428373
Ok(Params {
429374
from: os("foo"),
430375
to: os("bar"),
431-
format: Format::Normal,
432-
context_count: 3,
433-
report_identical_files: false,
434-
brief: false,
435-
expand_tabs: false,
436-
tabsize: DEFAULT_TABSIZE,
376+
..Default::default()
437377
}),
438378
parse_params([os("diff"), os("foo"), os("bar")].iter().cloned())
439379
);
440380
assert_eq!(
441381
Ok(Params {
442382
from: os("foo"),
443383
to: os("bar"),
444-
format: Format::Normal,
445-
context_count: 3,
446-
report_identical_files: false,
447-
brief: false,
448-
expand_tabs: false,
449384
tabsize: 0,
385+
..Default::default()
450386
}),
451387
parse_params(
452388
[os("diff"), os("--tabsize=0"), os("foo"), os("bar")]
@@ -458,12 +394,8 @@ mod tests {
458394
Ok(Params {
459395
from: os("foo"),
460396
to: os("bar"),
461-
format: Format::Normal,
462-
context_count: 3,
463-
report_identical_files: false,
464-
brief: false,
465-
expand_tabs: false,
466397
tabsize: 42,
398+
..Default::default()
467399
}),
468400
parse_params(
469401
[os("diff"), os("--tabsize=42"), os("foo"), os("bar")]
@@ -519,12 +451,7 @@ mod tests {
519451
Ok(Params {
520452
from: os("-g"),
521453
to: os("-h"),
522-
format: Format::Normal,
523-
context_count: 3,
524-
report_identical_files: false,
525-
brief: false,
526-
expand_tabs: false,
527-
tabsize: DEFAULT_TABSIZE,
454+
..Default::default()
528455
}),
529456
parse_params([os("diff"), os("--"), os("-g"), os("-h")].iter().cloned())
530457
);

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