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Commit | Line | Data |
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487cf647 FG |
1 | // run-rustfix |
2 | #![allow(unused)] | |
3 | #![warn(clippy::seek_to_start_instead_of_rewind)] | |
4 | ||
5 | use std::fs::OpenOptions; | |
6 | use std::io::{Read, Seek, SeekFrom, Write}; | |
7 | ||
8 | struct StructWithSeekMethod {} | |
9 | ||
10 | impl StructWithSeekMethod { | |
11 | fn seek(&mut self, from: SeekFrom) {} | |
12 | } | |
13 | ||
14 | trait MySeekTrait { | |
15 | fn seek(&mut self, from: SeekFrom) {} | |
16 | } | |
17 | ||
18 | struct StructWithSeekTrait {} | |
19 | impl MySeekTrait for StructWithSeekTrait {} | |
20 | ||
21 | // This should NOT trigger clippy warning because | |
22 | // StructWithSeekMethod does not implement std::io::Seek; | |
23 | fn seek_to_start_false_method(t: &mut StructWithSeekMethod) { | |
24 | t.seek(SeekFrom::Start(0)); | |
25 | } | |
26 | ||
27 | // This should NOT trigger clippy warning because | |
28 | // StructWithSeekMethod does not implement std::io::Seek; | |
29 | fn seek_to_start_method_owned_false<T>(mut t: StructWithSeekMethod) { | |
30 | t.seek(SeekFrom::Start(0)); | |
31 | } | |
32 | ||
33 | // This should NOT trigger clippy warning because | |
34 | // StructWithSeekMethod does not implement std::io::Seek; | |
35 | fn seek_to_start_false_trait(t: &mut StructWithSeekTrait) { | |
36 | t.seek(SeekFrom::Start(0)); | |
37 | } | |
38 | ||
39 | // This should NOT trigger clippy warning because | |
40 | // StructWithSeekMethod does not implement std::io::Seek; | |
41 | fn seek_to_start_false_trait_owned<T>(mut t: StructWithSeekTrait) { | |
42 | t.seek(SeekFrom::Start(0)); | |
43 | } | |
44 | ||
45 | // This should NOT trigger clippy warning because | |
46 | // StructWithSeekMethod does not implement std::io::Seek; | |
47 | fn seek_to_start_false_trait_bound<T: MySeekTrait>(t: &mut T) { | |
48 | t.seek(SeekFrom::Start(0)); | |
49 | } | |
50 | ||
51 | // This should trigger clippy warning | |
52 | fn seek_to_start<T: Seek>(t: &mut T) { | |
53 | t.rewind(); | |
54 | } | |
55 | ||
56 | // This should trigger clippy warning | |
57 | fn owned_seek_to_start<T: Seek>(mut t: T) { | |
58 | t.rewind(); | |
59 | } | |
60 | ||
61 | // This should NOT trigger clippy warning because | |
62 | // it does not seek to start | |
63 | fn seek_to_5<T: Seek>(t: &mut T) { | |
64 | t.seek(SeekFrom::Start(5)); | |
65 | } | |
66 | ||
67 | // This should NOT trigger clippy warning because | |
68 | // it does not seek to start | |
69 | fn seek_to_end<T: Seek>(t: &mut T) { | |
70 | t.seek(SeekFrom::End(0)); | |
71 | } | |
72 | ||
f25598a0 FG |
73 | // This should NOT trigger clippy warning because |
74 | // expr is used here | |
75 | fn seek_to_start_in_let<T: Seek>(t: &mut T) { | |
76 | let a = t.seek(SeekFrom::Start(0)).unwrap(); | |
77 | } | |
78 | ||
487cf647 FG |
79 | fn main() { |
80 | let mut f = OpenOptions::new() | |
81 | .write(true) | |
82 | .read(true) | |
83 | .create(true) | |
84 | .open("foo.txt") | |
85 | .unwrap(); | |
86 | ||
87 | let mut my_struct_trait = StructWithSeekTrait {}; | |
88 | seek_to_start_false_trait_bound(&mut my_struct_trait); | |
89 | ||
90 | let hello = "Hello!\n"; | |
91 | write!(f, "{hello}").unwrap(); | |
92 | seek_to_5(&mut f); | |
93 | seek_to_end(&mut f); | |
94 | seek_to_start(&mut f); | |
95 | ||
96 | let mut buf = String::new(); | |
97 | f.read_to_string(&mut buf).unwrap(); | |
98 | ||
99 | assert_eq!(&buf, hello); | |
100 | } | |
101 | ||
102 | #[clippy::msrv = "1.54"] | |
103 | fn msrv_1_54() { | |
104 | let mut f = OpenOptions::new() | |
105 | .write(true) | |
106 | .read(true) | |
107 | .create(true) | |
108 | .open("foo.txt") | |
109 | .unwrap(); | |
110 | ||
111 | let hello = "Hello!\n"; | |
112 | write!(f, "{hello}").unwrap(); | |
113 | ||
114 | f.seek(SeekFrom::Start(0)); | |
115 | ||
116 | let mut buf = String::new(); | |
117 | f.read_to_string(&mut buf).unwrap(); | |
118 | ||
119 | assert_eq!(&buf, hello); | |
120 | } | |
121 | ||
122 | #[clippy::msrv = "1.55"] | |
123 | fn msrv_1_55() { | |
124 | let mut f = OpenOptions::new() | |
125 | .write(true) | |
126 | .read(true) | |
127 | .create(true) | |
128 | .open("foo.txt") | |
129 | .unwrap(); | |
130 | ||
131 | let hello = "Hello!\n"; | |
132 | write!(f, "{hello}").unwrap(); | |
133 | ||
134 | f.rewind(); | |
135 | ||
136 | let mut buf = String::new(); | |
137 | f.read_to_string(&mut buf).unwrap(); | |
138 | ||
139 | assert_eq!(&buf, hello); | |
140 | } |