split: tweak usage text; use more idiomatic if let to get rid of un…

…wrap

src/cmd/split.rs

@@ -1,23 +1,23 @@
 static USAGE: &str = r#"
 Splits the given CSV data into chunks.
 
-Uses multithreading to go faster if the given CSV data has an index.
+Uses multithreading to go faster if the CSV has an index.
 
 The files are written to the directory given with the name '{start}.csv',
 where {start} is the index of the first record of the chunk (starting at 0).
 
 Examples:
  qsv split outdir --size 100 --filename chunk_{}.csv input.csv
 
- qsv split outdir -s 100 --filename chunk_{}.csv --pad 5 input.csv
+ qsv split outputdir -s 100 --filename chunk_{}.csv --pad 5 input.csv
 
  qsv split . -s 100 input.csv
 
- cat in.csv | qsv split outdir -s 1000
+ cat in.csv | qsv split mysplitoutput -s 1000
 
  qsv split outdir --chunks 10 input.csv
 
- qsv split outdir -c 10 -j 4 input.csv
+ qsv split splitoutdir -c 10 -j 4 input.csv
 
 For more examples, see https://github.com/jqnatividad/qsv/blob/master/tests/test_split.rs.
 
@@ -116,9 +116,9 @@ impl Args {
  let mut rdr = rconfig.reader()?;
  let headers = rdr.byte_headers()?.clone();
 
- let chunk_size = if self.flag_chunks.is_some() {
+ let chunk_size = if let Some(flag_chunks) = self.flag_chunks {
  let count = util::count_rows(&rconfig)?;
- let chunk = self.flag_chunks.unwrap();
+ let chunk = flag_chunks;
  if chunk == 0 {
  return fail_incorrectusage_clierror!("--chunk must be greater than 0.");
  }