Make ruff_cli binary a small wrapper around lib (#3398)

crates/ruff_dev/src/generate_all.rs

@@ -8,28 +8,39 @@ pub const REGENERATE_ALL_COMMAND: &str = "cargo dev generate-all";
 
 #[derive(clap::Args)]
 pub struct Args {
-    /// Write the generated artifacts to stdout (rather than to the filesystem).
-    #[arg(long)]
-    dry_run: bool,
+    #[arg(long, default_value_t, value_enum)]
+    mode: Mode,
+}
+
+#[derive(Copy, Clone, PartialEq, Eq, clap::ValueEnum, Default)]
+pub enum Mode {
+    /// Update the content in the `configuration.md`
+    #[default]
+    Write,
+
     /// Don't write to the file, check if the file is up-to-date and error if not
-    #[arg(long)]
-    check: bool,
+    Check,
+
+    /// Write the generated help to stdout (rather than to `docs/configuration.md`).
+    DryRun,
+}
+
+impl Mode {
+    const fn is_check(self) -> bool {
+        matches!(self, Mode::Check)
+    }
+
+    pub(crate) const fn is_dry_run(self) -> bool {
+        matches!(self, Mode::DryRun)
+    }
 }
 
 pub fn main(args: &Args) -> Result<()> {
     // Not checked in
-    if !args.check {
-        generate_docs::main(&generate_docs::Args {
-            dry_run: args.dry_run,
-        })?;
+    if !args.mode.is_check() {
+        generate_docs::main(&generate_docs::Args { dry_run: true })?;
     }
-    generate_json_schema::main(&generate_json_schema::Args {
-        dry_run: args.dry_run,
-        check: args.check,
-    })?;
-    generate_cli_help::main(&generate_cli_help::Args {
-        dry_run: args.dry_run,
-        check: args.check,
-    })?;
+    generate_json_schema::main(&generate_json_schema::Args { mode: args.mode })?;
+    generate_cli_help::main(&generate_cli_help::Args { mode: args.mode })?;
     Ok(())
 }