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suggest similar lint names for unknown lints
This commit is contained in:
Andy Russell
parent
adbfec229c
commit
90726e1ac1
@ -42,11 +42,12 @@ use util::nodemap::FxHashMap;
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use std::default::Default as StdDefault;
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use syntax::ast;
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use syntax::edition;
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use syntax_pos::{MultiSpan, Span, symbol::LocalInternedString};
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use syntax_pos::{MultiSpan, Span, symbol::{LocalInternedString, Symbol}};
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use errors::DiagnosticBuilder;
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use hir;
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use hir::def_id::LOCAL_CRATE;
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use hir::intravisit as hir_visit;
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use syntax::util::lev_distance::find_best_match_for_name;
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use syntax::visit as ast_visit;
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/// Information about the registered lints.
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@ -139,8 +140,8 @@ struct LintGroup {
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pub enum CheckLintNameResult<'a> {
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Ok(&'a [LintId]),
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/// Lint doesn't exist
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NoLint,
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/// Lint doesn't exist. Potentially contains a suggestion for a correct lint name.
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NoLint(Option<Symbol>),
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/// The lint is either renamed or removed. This is the warning
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/// message, and an optional new name (`None` if removed).
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Warning(String, Option<String>),
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@ -359,8 +360,14 @@ impl LintStore {
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CheckLintNameResult::Warning(ref msg, _) => {
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Some(sess.struct_warn(msg))
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},
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CheckLintNameResult::NoLint => {
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Some(struct_err!(sess, E0602, "unknown lint: `{}`", lint_name))
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CheckLintNameResult::NoLint(suggestion) => {
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let mut err = struct_err!(sess, E0602, "unknown lint: `{}`", lint_name);
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if let Some(suggestion) = suggestion {
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err.help(&format!("did you mean: `{}`", suggestion));
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}
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Some(err)
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}
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CheckLintNameResult::Tool(result) => match result {
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Err((Some(_), new_name)) => Some(sess.struct_warn(&format!(
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@ -464,7 +471,16 @@ impl LintStore {
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match self.by_name.get(&complete_name) {
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None => match self.lint_groups.get(&*complete_name) {
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// Now we are sure, that this lint exists nowhere
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None => CheckLintNameResult::NoLint,
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None => {
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let symbols = self.by_name.keys()
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.map(|name| Symbol::intern(&name))
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.collect::<Vec<_>>();
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let suggestion =
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find_best_match_for_name(symbols.iter(), &lint_name.to_lowercase(), None);
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CheckLintNameResult::NoLint(suggestion)
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}
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Some(LintGroup { lint_ids, depr, .. }) => {
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// Reaching this would be weird, but let's cover this case anyway
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if let Some(LintAlias { name, silent }) = depr {
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@ -484,7 +500,7 @@ impl LintStore {
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Some(&Id(ref id)) => {
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CheckLintNameResult::Tool(Err((Some(slice::from_ref(id)), complete_name)))
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}
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_ => CheckLintNameResult::NoLint,
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_ => CheckLintNameResult::NoLint(None),
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}
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}
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}
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@ -385,7 +385,7 @@ impl<'a> LintLevelsBuilder<'a> {
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}
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err.emit();
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}
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CheckLintNameResult::NoLint => {
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CheckLintNameResult::NoLint(suggestion) => {
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let lint = builtin::UNKNOWN_LINTS;
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let (level, src) = self.sets.get_lint_level(lint,
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self.cur,
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@ -398,22 +398,17 @@ impl<'a> LintLevelsBuilder<'a> {
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src,
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Some(li.span.into()),
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&msg);
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if name.as_str().chars().any(|c| c.is_uppercase()) {
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let name_lower = name.as_str().to_lowercase().to_string();
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if let CheckLintNameResult::NoLint =
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store.check_lint_name(&name_lower, tool_name) {
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db.emit();
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} else {
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db.span_suggestion_with_applicability(
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li.span,
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"lowercase the lint name",
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name_lower,
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Applicability::MachineApplicable
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).emit();
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}
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} else {
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db.emit();
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if let Some(suggestion) = suggestion {
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db.span_suggestion_with_applicability(
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li.span,
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"did you mean",
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suggestion.to_string(),
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Applicability::MachineApplicable,
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);
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}
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db.emit();
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}
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}
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}
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@ -8,9 +8,12 @@
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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// compile-flags:-D bogus
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// compile-flags:-D bogus -D dead_cod
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// error-pattern:unknown lint
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// error-pattern:unknown lint: `bogus`
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// error-pattern:requested on the command line with `-D bogus`
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// error-pattern:unknown lint: `dead_cod`
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// error-pattern:requested on the command line with `-D dead_cod`
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// error-pattern:did you mean: `dead_code`
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fn main() { }
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@ -2,6 +2,11 @@ error[E0602]: unknown lint: `bogus`
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= note: requested on the command line with `-D bogus`
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error: aborting due to previous error
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error[E0602]: unknown lint: `dead_cod`
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= help: did you mean: `dead_code`
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= note: requested on the command line with `-D dead_cod`
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error: aborting due to 2 previous errors
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For more information about this error, try `rustc --explain E0602`.
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@ -8,6 +8,12 @@
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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#![allow(not_a_real_lint)] //~ WARN unknown lint
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#![deny(unused)]
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fn main() { let unused = (); } //~ ERROR unused variable
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#![deny(unknown_lints)]
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#![allow(not_a_real_lint)] //~ ERROR unknown lint
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#![deny(dead_cod)] //~ ERROR unknown lint
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//~| HELP did you mean
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//~| SUGGESTION dead_code
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fn main() {}
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@ -1,23 +1,20 @@
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warning: unknown lint: `not_a_real_lint`
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--> $DIR/lint-unknown-lint.rs:11:10
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error: unknown lint: `not_a_real_lint`
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--> $DIR/lint-unknown-lint.rs:13:10
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LL | #![allow(not_a_real_lint)] //~ WARN unknown lint
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LL | #![allow(not_a_real_lint)] //~ ERROR unknown lint
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| ^^^^^^^^^^^^^^^
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= note: #[warn(unknown_lints)] on by default
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error: unused variable: `unused`
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--> $DIR/lint-unknown-lint.rs:13:17
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LL | fn main() { let unused = (); } //~ ERROR unused variable
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| ^^^^^^ help: consider using `_unused` instead
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note: lint level defined here
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--> $DIR/lint-unknown-lint.rs:12:9
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--> $DIR/lint-unknown-lint.rs:11:9
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LL | #![deny(unused)]
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| ^^^^^^
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= note: #[deny(unused_variables)] implied by #[deny(unused)]
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LL | #![deny(unknown_lints)]
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| ^^^^^^^^^^^^^
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error: aborting due to previous error
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error: unknown lint: `dead_cod`
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--> $DIR/lint-unknown-lint.rs:15:9
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LL | #![deny(dead_cod)] //~ ERROR unknown lint
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| ^^^^^^^^ help: did you mean: `dead_code`
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error: aborting due to 2 previous errors
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@ -10,11 +10,11 @@ warning: unknown lint: `DEAD_CODE`
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--> $DIR/not_found.rs:18:8
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LL | #[warn(DEAD_CODE)]
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| ^^^^^^^^^ help: lowercase the lint name: `dead_code`
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| ^^^^^^^^^ help: did you mean: `dead_code`
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warning: unknown lint: `Warnings`
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--> $DIR/not_found.rs:20:8
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LL | #[deny(Warnings)]
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| ^^^^^^^^ help: lowercase the lint name: `warnings`
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| ^^^^^^^^ help: did you mean: `warnings`
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