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Case sensitive file extensions - #6500

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Javier-varez:case_sensitive_file_extensions
Jan 15, 2021
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Case sensitive file extensions#6500
bors merged 3 commits into
rust-lang:masterfrom
Javier-varez:case_sensitive_file_extensions

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@Javier-varez

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Closes #6425

Looks for ends_with methods calls with case sensitive extension comparisons.

changelog: Add new lint that warns about case-sensitive file extension comparisons.

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Thanks for the pull request, and welcome! The Rust team is excited to review your changes, and you should hear from @llogiq (or someone else) soon.

If any changes to this PR are deemed necessary, please add them as extra commits. This ensures that the reviewer can see what has changed since they last reviewed the code. Due to the way GitHub handles out-of-date commits, this should also make it reasonably obvious what issues have or haven't been addressed. Large or tricky changes may require several passes of review and changes.

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@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties label Dec 23, 2020
@Javier-varez
Javier-varez force-pushed the case_sensitive_file_extensions branch from 0eae294 to 07a9204 Compare December 23, 2020 16:28
@Javier-varez

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The Clippy Test check error seem to be unrelated to this change. Seems to be already fixed by matthiaskrgr/rust-clippy@2218dd6

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bors commented Jan 4, 2021

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☔ The latest upstream changes (presumably #6538) made this pull request unmergeable. Please resolve the merge conflicts.

@giraffate

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Can you do a rebase, not merge? We follow a rustc no-merge policy.

@Javier-varez
Javier-varez force-pushed the case_sensitive_file_extensions branch from 0b92c6e to a6828fc Compare January 5, 2021 05:58
@Javier-varez

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Sure! Sorry, it is my first contribution and I missed this.

@flip1995

flip1995 commented Jan 5, 2021

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ping from triage @llogiq. This is awaiting your review.

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bors commented Jan 5, 2021

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☔ The latest upstream changes (presumably #6542) made this pull request unmergeable. Please resolve the merge conflicts.

Closes rust-lang#6425

Looks for ends_with methods calls with case sensitive extensions.
This was left as default and caused a CI failure for the
case_sensitive_file_extension_comparison lint.
@Javier-varez
Javier-varez force-pushed the case_sensitive_file_extensions branch from a6828fc to e56973a Compare January 5, 2021 13:22
@llogiq

llogiq commented Jan 13, 2021

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I like this lint in general. It may benefit from adding a suggestion, as the replacement code in the docs is probably not obvious to the layman. However, we can still do that in a later PR. I still have to check if the docs and messages follow our conventions, will do that later.


fn check_case_sensitive_file_extension_comparison(ctx: &LateContext<'_>, expr: &Expr<'_>) -> Option<Span> {
lazy_static! {
static ref RE: Regex = Regex::new(r"^\.([a-z0-9]{1,5}|[A-Z0-9]{1,5})$").unwrap();

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regex is a fairly heavy dependency for this fairly simple check.

@llogiq

llogiq commented Jan 15, 2021

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Ok, we already use regex-syntax, so adding regex should perhaps not be a big deal, but if someone feels sufficiently nerdsniped, they can still remove the regex in a followup PR. I won't block this for the added dependency though.

@bors r+

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bors commented Jan 15, 2021

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📌 Commit e56973a has been approved by llogiq

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bors commented Jan 15, 2021

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⌛ Testing commit e56973a with merge 3577cf7...

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bors commented Jan 15, 2021

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☀️ Test successful - checks-action_dev_test, checks-action_remark_test, checks-action_test
Approved by: llogiq
Pushing 3577cf7 to master...

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bors merged commit 3577cf7 into rust-lang:master Jan 15, 2021
@flip1995 flip1995 mentioned this pull request Jan 30, 2021
bors added a commit that referenced this pull request Jan 30, 2021
No lazy static regex

r? `@llogiq`

#6500

regex is unnecessary for this lint (#6500 (comment))
lazy_static is unnecessary. The std lazy feature should be  used instead.

changelog: none
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Suggest handling case insensitivity on .ends_with(".ext")

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