update_lints rewrite: Add structure and --print-only

clippy_dev/src/main.rs

@@ -0,0 +1,53 @@
+extern crate clap;
+extern crate clippy_dev;
+extern crate regex;
+
+use clap::{App, Arg, SubCommand};
+use clippy_dev::*;
+
+fn main() {
+    let matches = App::new("Clippy developer tooling")
+        .subcommand(
+            SubCommand::with_name("update_lints")
+                .about("Update the lint list")
+                .arg(
+                    Arg::with_name("print-only")
+                        .long("print-only")
+                        .short("p")
+                        .help("Print a table of lints to STDOUT. Does not modify any files."),
+                )
+        )
+        .get_matches();
+
+    if let Some(matches) = matches.subcommand_matches("update_lints") {
+        if matches.is_present("print-only") {
+            print_lints();
+        }
+    }
+}
+
+fn print_lints() {
+    let lint_list = collect_all();
+    let print_clippy_lint_groups: [&str; 7] = [
+        "correctness",
+        "style",
+        "complexity",
+        "perf",
+        "pedantic",
+        "nursery",
+        "restriction"
+    ];
+    // We could use itertools' group_by to make this much more concise:
+    for group in &print_clippy_lint_groups {
+        println!("\n## {}", group);
+
+        let mut group_lints = Lint::in_lint_group(group, &lint_list);
+        group_lints.sort_by(|a, b| a.name.cmp(&b.name));
+
+        for lint in group_lints {
+            if lint.deprecation.is_some() { continue; }
+            println!("* [{}]({}#{}) ({})", lint.name, clippy_dev::DOCS_LINK.clone(), lint.name, lint.desc);
+        }
+    }
+    println!("there are {} lints", Lint::active_lints(&lint_list).len());
+}