Add general stats command

brood/src/commands/stats.rs

@@ -0,0 +1,95 @@
+mod redirects;
+
+use std::io;
+
+use thousands::Separable;
+
+use crate::data::Data;
+
+#[derive(Debug, clap::Parser)]
+enum Command {
+    Redirects(redirects::Cmd),
+}
+
+/// Show interesting stats.
+#[derive(Debug, clap::Parser)]
+pub struct Cmd {
+    #[command(subcommand)]
+    command: Option<Command>,
+}
+
+impl Cmd {
+    pub fn run(self, data: Data) -> io::Result<()> {
+        if let Some(cmd) = self.command {
+            return match cmd {
+                Command::Redirects(cmd) => cmd.run(data),
+            };
+        }
+
+        println!();
+
+        const W_LABEL: usize = 14;
+        const W_NUM: usize = 11;
+
+        let n_pages = data.pages.len();
+        let n_redirects = data.pages.iter().filter(|p| p.redirect).count();
+        let n_articles = n_pages - n_redirects;
+
+        println!(
+            "{:>W_LABEL$}: {:>W_NUM$}",
+            "Pages",
+            n_pages.separate_with_underscores()
+        );
+
+        println!(
+            "{:>W_LABEL$}: {:>W_NUM$}",
+            "Articles",
+            n_articles.separate_with_underscores()
+        );
+
+        println!(
+            "{:>W_LABEL$}: {:>W_NUM$}",
+            "Redirects",
+            n_redirects.separate_with_underscores()
+        );
+
+        println!();
+        println!(
+            "{:>W_LABEL$}: {:>W_NUM$}",
+            "Links",
+            data.links.len().separate_with_underscores()
+        );
+
+        println!(
+            "{:>W_LABEL$}: {:>W_NUM$}",
+            "in parens",
+            data.links
+                .iter()
+                .filter(|l| l.in_parens())
+                .count()
+                .separate_with_underscores()
+        );
+
+        println!(
+            "{:>W_LABEL$}: {:>W_NUM$}",
+            "in structures",
+            data.links
+                .iter()
+                .filter(|l| l.in_structure())
+                .count()
+                .separate_with_underscores()
+        );
+
+        println!(
+            "{:>W_LABEL$}: {:>W_NUM$}",
+            "pg eligible",
+            data.links
+                .iter()
+                .filter(|l| !l.in_parens() && !l.in_structure())
+                .count()
+                .separate_with_underscores()
+        );
+
+        Ok(())
+    }
+}