cargo dev crater: gather and save lint statistics (how often a lint triggered)

clippy_dev/src/crater.rs

@@ -224,7 +224,30 @@ pub fn run() {
         .flatten()
         .collect();
 
-    let all_msgs: Vec<String> = clippy_warnings.iter().map(|warning| warning.to_string()).collect();
+    // generate some stats:
+
+    // count lint type occurrences
+    let mut counter: HashMap<&String, usize> = HashMap::new();
+    clippy_warnings
+        .iter()
+        .for_each(|wrn| *counter.entry(&wrn.linttype).or_insert(0) += 1);
+
+    // collect into a tupled list for sorting
+    let mut stats: Vec<(&&String, &usize)> = counter.iter().map(|(lint, count)| (lint, count)).collect();
+    // sort by number of lint occurences
+    stats.sort_by_key(|(_, count)| *count);
+    // biggest number first
+    stats.reverse();
+
+    let stats_formatted: String = stats
+        .iter()
+        .map(|(lint, count)| format!("{} {}\n", lint, count))
+        .collect::<String>();
+
+    let mut all_msgs: Vec<String> = clippy_warnings.iter().map(|warning| warning.to_string()).collect();
+    all_msgs.sort();
+    all_msgs.push("\n\n\n\nStats\n\n".into());
+    all_msgs.push(stats_formatted);
 
     // save the text into mini-crater/logs.txt
     let text = all_msgs.join("");

mini-crater/logs.txt

@@ -3247,3 +3247,115 @@ xsv/0.13.0/src/select.rs:99:17 clippy::similar_names "binding's name is too simi
 xsv/0.13.0/src/util.rs:150:5 clippy::doc_markdown "you should put bare URLs between `<`/`>` or make a proper Markdown link"
 xsv/0.13.0/src/util.rs:37:33 clippy::map_clone "you are using an explicit closure for copying elements"
 xsv/0.13.0/src/util.rs:90:1 clippy::needless_lifetimes "explicit lifetimes given in parameter types where they could be elided (or replaced with `'_` if needed by type declaration)"
+
+
+
+
+Stats
+
+clippy::must_use_candidate 552
+clippy::unreadable_literal 365
+clippy::missing_errors_doc 338
+clippy::doc_markdown 178
+clippy::wildcard_imports 160
+clippy::items_after_statements 139
+clippy::module_name_repetitions 137
+clippy::redundant_closure_for_method_calls 135
+clippy::redundant_field_names 111
+clippy::cast_possible_truncation 91
+clippy::similar_names 79
+clippy::match_same_arms 64
+clippy::inline_always 59
+clippy::single_match_else 45
+clippy::unseparated_literal_suffix 41
+clippy::enum_glob_use 40
+clippy::cast_precision_loss 35
+clippy::if_not_else 35
+clippy::filter_map 31
+clippy::too_many_lines 31
+clippy::redundant_else 29
+clippy::trivially_copy_pass_by_ref 26
+clippy::cast_lossless 23
+clippy::redundant_static_lifetimes 21
+clippy::struct_excessive_bools 20
+clippy::map_unwrap_or 20
+clippy::unusual_byte_groupings 19
+clippy::unused_self 19
+clippy::cast_possible_wrap 19
+clippy::cast_sign_loss 19
+clippy::unnecessary_wraps 19
+clippy::needless_pass_by_value 18
+clippy::default_trait_access 16
+clippy::linkedlist 14
+clippy::single_char_add_str 14
+clippy::shadow_unrelated 13
+clippy::cargo_common_metadata 13
+clippy::option_if_let_else 12
+clippy::needless_lifetimes 12
+clippy::multiple_crate_versions 11
+clippy::needless_doctest_main 10
+clippy::missing_safety_doc 10
+clippy::manual_range_contains 10
+clippy::match_wildcard_for_single_variants 10
+clippy::find_map 9
+clippy::wrong_self_convention 8
+clippy::invalid_upcast_comparisons 8
+clippy::option_map_unit_fn 7
+clippy::map_clone 7
+clippy::explicit_into_iter_loop 7
+clippy::range_plus_one 7
+clippy::manual_strip 6
+clippy::non_ascii_literal 6
+clippy::single_component_path_imports 6
+clippy::field_reassign_with_default 5
+clippy::new_without_default 5
+clippy::len_without_is_empty 5
+clippy::identity_op 5
+clippy::needless_return 5
+clippy::empty_enum 5
+clippy::match_like_matches_macro 5
+clippy::explicit_iter_loop 5
+clippy::too_many_arguments 4
+clippy::let_underscore_drop 4
+clippy::if_same_then_else 4
+clippy::filter_map_next 3
+clippy::zero_ptr 3
+clippy::fn_params_excessive_bools 3
+clippy::mut_mut 3
+clippy::manual_non_exhaustive 2
+clippy::comparison_to_empty 2
+clippy::question_mark 2
+clippy::redundant_pattern_matching 2
+clippy::write_with_newline 2
+clippy::unnecessary_cast 2
+clippy::option_option 2
+clippy::match_on_vec_items 2
+clippy::type_complexity 2
+clippy::len_zero 2
+clippy::expl_impl_clone_on_copy 2
+clippy::option_as_ref_deref 2
+clippy::unused_unit 2
+clippy::derive_hash_xor_eq 2
+clippy::while_let_on_iterator 1
+clippy::clone_on_copy 1
+clippy::same_item_push 1
+clippy::from_iter_instead_of_collect 1
+clippy::or_fun_call 1
+clippy::pub_enum_variant_names 1
+clippy::used_underscore_binding 1
+clippy::precedence 1
+clippy::redundant_clone 1
+clippy::collapsible_if 1
+clippy::stable_sort_primitive 1
+clippy::unit_arg 1
+clippy::nonminimal_bool 1
+clippy::comparison_chain 1
+clippy::mem_replace_with_default 1
+clippy::manual_saturating_arithmetic 1
+clippy::expect_fun_call 1
+clippy::should_implement_trait 1
+clippy::verbose_bit_mask 1
+clippy::int_plus_one 1
+clippy::unnecessary_lazy_evaluations 1
+clippy::from_over_into 1
+clippy::explicit_deref_methods 1