refactor(complete): Pull our registration writing

Author: epage

clap_complete/src/env/mod.rs

@@ -230,26 +230,8 @@ impl<'s, F: Fn() -> clap::Command> CompleteEnv<'s, F> {
             .unwrap_or(args.len());
         args.drain(0..escape_index);
         if args.is_empty() {
-            let name = cmd.get_name();
-            let bin = self
-                .bin
-                .as_deref()
-                .or_else(|| cmd.get_bin_name())
-                .unwrap_or_else(|| cmd.get_name());
-            let completer = if let Some(completer) = self.completer.as_deref() {
-                completer.to_owned()
-            } else {
-                let mut completer = std::path::PathBuf::from(completer);
-                if let Some(current_dir) = current_dir {
-                    if 1 < completer.components().count() {
-                        completer = current_dir.join(completer);
-                    }
-                }
-                completer.to_string_lossy().into_owned()
-            };
-
             let mut buf = Vec::new();
-            shell.write_registration(self.var, name, bin, &completer, &mut buf)?;
+            self.write_registration(&cmd, current_dir, shell, completer, &mut buf)?;
             std::io::stdout().write_all(&buf)?;
         } else {
             let mut buf = Vec::new();
@@ -284,6 +266,37 @@ impl<'s, F: Fn() -> clap::Command> CompleteEnv<'s, F> {
         })?;
         Ok(shell)
     }
+
+    fn write_registration(
+        &self,
+        cmd: &clap::Command,
+        current_dir: Option<&std::path::Path>,
+        shell: &dyn EnvCompleter,
+        completer: OsString,
+        buf: &mut dyn std::io::Write,
+    ) -> Result<(), std::io::Error> {
+        let name = cmd.get_name();
+        let bin = self
+            .bin
+            .as_deref()
+            .or_else(|| cmd.get_bin_name())
+            .unwrap_or_else(|| cmd.get_name());
+        let completer = if let Some(completer) = self.completer.as_deref() {
+            completer.to_owned()
+        } else {
+            let mut completer = std::path::PathBuf::from(completer);
+            if let Some(current_dir) = current_dir {
+                if 1 < completer.components().count() {
+                    completer = current_dir.join(completer);
+                }
+            }
+            completer.to_string_lossy().into_owned()
+        };
+
+        shell.write_registration(self.var, name, bin, &completer, buf)?;
+
+        Ok(())
+    }
 }
 
 /// Collection of shell-specific completers