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unused_io_amount: Use span_lint_and_help.

Browse source 
This improves the quality of the genrated output and makes it
more in line with other lint messages.

changelog: [`unused_io_amount`]: Improve help text
This commit is contained in:
Nick Mathewson 2021-12-31 12:20:02 -05:00
parent 65d1f83d2c
commit b6bcf0c51b
2 changed files with 58 additions and 23 deletions
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26
clippy_lints/src/unused_io_amount.rs
View file

@ -1,4 +1,4 @@
use clippy_utils::diagnostics::span_lint;
use clippy_utils::diagnostics::{span_lint, span_lint_and_help};
use clippy_utils::{is_try, match_trait_method, paths};
use rustc_hir as hir;
use rustc_lint::{LateContext, LateLintPass};
@ -126,32 +126,40 @@ fn check_method_call(cx: &LateContext<'_>, call: &hir::Expr<'_>, expr: &hir::Exp
};
match (read_trait, write_trait, symbol, is_await) {
(true, _, "read", false) => span_lint(
(true, _, "read", false) => span_lint_and_help(
cx,
UNUSED_IO_AMOUNT,
expr.span,
"read amount is not handled. Use `Read::read_exact` instead",
"read amount is not handled",
None,
"use `Read::read_exact` instead, or handle partial reads",
),
(true, _, "read", true) => span_lint(
(true, _, "read", true) => span_lint_and_help(
cx,
UNUSED_IO_AMOUNT,
expr.span,
"read amount is not handled. Use `AsyncReadExt::read_exact` instead",
"read amount is not handled",
None,
"use `AsyncReadExt::read_exact` instead, or handle partial reads",
),
(true, _, "read_vectored", _) => {
span_lint(cx, UNUSED_IO_AMOUNT, expr.span, "read amount is not handled");
},
(_, true, "write", false) => span_lint(
(_, true, "write", false) => span_lint_and_help(
cx,
UNUSED_IO_AMOUNT,
expr.span,
"written amount is not handled. Use `Write::write_all` instead",
"written amount is not handled",
None,
"use `Write::write_all` instead, or handle partial writes",
),
(_, true, "write", true) => span_lint(
(_, true, "write", true) => span_lint_and_help(
cx,
UNUSED_IO_AMOUNT,
expr.span,
"written amount is not handled. Use `AsyncWriteExt::write_all` instead",
"written amount is not handled",
None,
"use `AsyncWriteExt::write_all` instead, or handle partial writes",
),
(_, true, "write_vectored", _) => {
span_lint(cx, UNUSED_IO_AMOUNT, expr.span, "written amount is not handled");

55
tests/ui/unused_io_amount.stderr
View file

@ -1,28 +1,35 @@
error: written amount is not handled. Use `Write::write_all` instead
error: written amount is not handled
--> $DIR/unused_io_amount.rs:9:5
|
LL | s.write(b"test")?;
| ^^^^^^^^^^^^^^^^^
|
= note: `-D clippy::unused-io-amount` implied by `-D warnings`
= help: use `Write::write_all` instead, or handle partial writes
error: read amount is not handled. Use `Read::read_exact` instead
error: read amount is not handled
--> $DIR/unused_io_amount.rs:11:5
|
LL | s.read(&mut buf)?;
| ^^^^^^^^^^^^^^^^^
|
= help: use `Read::read_exact` instead, or handle partial reads
error: written amount is not handled. Use `Write::write_all` instead
error: written amount is not handled
--> $DIR/unused_io_amount.rs:16:5
|
LL | s.write(b"test").unwrap();
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `Write::write_all` instead, or handle partial writes
error: read amount is not handled. Use `Read::read_exact` instead
error: read amount is not handled
--> $DIR/unused_io_amount.rs:18:5
|
LL | s.read(&mut buf).unwrap();
| ^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `Read::read_exact` instead, or handle partial reads
error: read amount is not handled
--> $DIR/unused_io_amount.rs:22:5
@ -36,25 +43,31 @@ error: written amount is not handled
LL | s.write_vectored(&[io::IoSlice::new(&[])])?;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
error: read amount is not handled. Use `Read::read_exact` instead
error: read amount is not handled
--> $DIR/unused_io_amount.rs:30:5
|
LL | reader.read(&mut result).ok()?;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `Read::read_exact` instead, or handle partial reads
error: read amount is not handled. Use `Read::read_exact` instead
error: read amount is not handled
--> $DIR/unused_io_amount.rs:39:5
|
LL | reader.read(&mut result).or_else(|err| Err(err))?;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `Read::read_exact` instead, or handle partial reads
error: read amount is not handled. Use `Read::read_exact` instead
error: read amount is not handled
--> $DIR/unused_io_amount.rs:51:5
|
LL | reader.read(&mut result).or(Err(Error::Kind))?;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `Read::read_exact` instead, or handle partial reads
error: read amount is not handled. Use `Read::read_exact` instead
error: read amount is not handled
--> $DIR/unused_io_amount.rs:58:5
|
LL | / reader
@ -63,42 +76,56 @@ LL | | .or(Err(Error::Kind))
LL | | .or(Err(Error::Kind))
LL | | .expect("error");
| |________________________^
|
= help: use `Read::read_exact` instead, or handle partial reads
error: written amount is not handled. Use `AsyncWriteExt::write_all` instead
error: written amount is not handled
--> $DIR/unused_io_amount.rs:67:5
|
LL | w.write(b"hello world").await.unwrap();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `AsyncWriteExt::write_all` instead, or handle partial writes
error: read amount is not handled. Use `AsyncReadExt::read_exact` instead
error: read amount is not handled
--> $DIR/unused_io_amount.rs:72:5
|
LL | r.read(&mut buf[..]).await.unwrap();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `AsyncReadExt::read_exact` instead, or handle partial reads
error: written amount is not handled. Use `AsyncWriteExt::write_all` instead
error: written amount is not handled
--> $DIR/unused_io_amount.rs:85:9
|
LL | w.write(b"hello world").await?;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `AsyncWriteExt::write_all` instead, or handle partial writes
error: read amount is not handled. Use `AsyncReadExt::read_exact` instead
error: read amount is not handled
--> $DIR/unused_io_amount.rs:93:9
|
LL | r.read(&mut buf[..]).await.or(Err(Error::Kind))?;
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `AsyncReadExt::read_exact` instead, or handle partial reads
error: written amount is not handled. Use `AsyncWriteExt::write_all` instead
error: written amount is not handled
--> $DIR/unused_io_amount.rs:101:5
|
LL | w.write(b"hello world").await.unwrap();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `AsyncWriteExt::write_all` instead, or handle partial writes
error: read amount is not handled. Use `AsyncReadExt::read_exact` instead
error: read amount is not handled
--> $DIR/unused_io_amount.rs:106:5
|
LL | r.read(&mut buf[..]).await.unwrap();
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
= help: use `AsyncReadExt::read_exact` instead, or handle partial reads
error: aborting due to 16 previous errors