split: add --verbose option

src/uu/split/src/split.rs

@@ -230,7 +230,6 @@ impl Strategy {
     }
 }
 
-#[allow(dead_code)]
 struct Settings {
     prefix: String,
     numeric_suffix: bool,
@@ -240,7 +239,7 @@ struct Settings {
     /// When supplied, a shell command to output to instead of xaa, xab …
     filter: Option<String>,
     strategy: Strategy,
-    verbose: bool, // TODO: warning: field is never read: `verbose`
+    verbose: bool,
 }
 
 trait Splitter {
@@ -396,6 +395,21 @@ fn split(settings: Settings) -> UResult<()> {
             break;
         }
 
+        // TODO It is silly to have the "creating file" message here
+        // after the file has been already created. However, because
+        // of the way the main loop has been written, an extra file
+        // gets created and then deleted in the last iteration of the
+        // loop. So we need to make sure we are not in that case when
+        // printing this message.
+        //
+        // This is only here temporarily while we make some
+        // improvements to the architecture of the main loop in this
+        // function. In the future, it will move to a more appropriate
+        // place---at the point where the file is actually created.
+        if settings.verbose {
+            println!("creating file {}", filename.quote());
+        }
+
         fileno += 1;
     }
     Ok(())

tests/by-util/test_split.rs

@@ -408,3 +408,19 @@ fn test_suffixes_exhausted() {
         .fails()
         .stderr_only("split: output file suffixes exhausted");
 }
+
+#[test]
+fn test_verbose() {
+    new_ucmd!()
+        .args(&["-b", "5", "--verbose", "asciilowercase.txt"])
+        .succeeds()
+        .stdout_only(
+            "creating file 'xaa'
+creating file 'xab'
+creating file 'xac'
+creating file 'xad'
+creating file 'xae'
+creating file 'xaf'
+",
+        );
+}