wc: document the long match

Author: sylvestre

src/uu/wc/src/wc.rs

@@ -317,6 +317,7 @@ fn word_count_from_reader<T: WordCountable>(
         // Specialize scanning loop to improve the performance.
         (false, false, false, false, false) => unreachable!(),
 
+        // show_bytes
         (true, false, false, false, false) => {
             // Fast path when only show_bytes is true.
             let (bytes, error) = count_bytes_fast(&mut reader);
@@ -330,58 +331,75 @@ fn word_count_from_reader<T: WordCountable>(
         }
 
         // Fast paths that can be computed without Unicode decoding.
+        // show_lines
         (false, false, true, false, false) => {
             count_bytes_chars_and_lines_fast::<_, false, false, true>(&mut reader)
         }
+        // show_chars
         (false, true, false, false, false) => {
             count_bytes_chars_and_lines_fast::<_, false, true, false>(&mut reader)
         }
+        // show_chars, show_lines
         (false, true, true, false, false) => {
             count_bytes_chars_and_lines_fast::<_, false, true, true>(&mut reader)
         }
+        // show_bytes, show_lines
         (true, false, true, false, false) => {
             count_bytes_chars_and_lines_fast::<_, true, false, true>(&mut reader)
         }
+        // show_bytes, show_chars
         (true, true, false, false, false) => {
             count_bytes_chars_and_lines_fast::<_, true, true, false>(&mut reader)
         }
+        // show_bytes, show_chars, show_lines
         (true, true, true, false, false) => {
             count_bytes_chars_and_lines_fast::<_, true, true, true>(&mut reader)
         }
-
+        // show_words
         (_, false, false, false, true) => {
             word_count_from_reader_specialized::<_, false, false, false, true>(reader)
         }
+        // show_max_line_length
         (_, false, false, true, false) => {
             word_count_from_reader_specialized::<_, false, false, true, false>(reader)
         }
+        // show_max_line_length, show_words
         (_, false, false, true, true) => {
             word_count_from_reader_specialized::<_, false, false, true, true>(reader)
         }
+        // show_chars, show_words
         (_, false, true, false, true) => {
             word_count_from_reader_specialized::<_, false, true, false, true>(reader)
         }
+        // show_chars, show_lines
         (_, false, true, true, false) => {
             word_count_from_reader_specialized::<_, false, true, true, false>(reader)
         }
+        // show_lines, show_max_line_length, show_words
         (_, false, true, true, true) => {
             word_count_from_reader_specialized::<_, false, true, true, true>(reader)
         }
+        // show_chars, show_words
         (_, true, false, false, true) => {
             word_count_from_reader_specialized::<_, true, false, false, true>(reader)
         }
+        // show_chars, show_max_line_length
         (_, true, false, true, false) => {
             word_count_from_reader_specialized::<_, true, false, true, false>(reader)
         }
+        // show_chars, show_max_line_length, show_words
         (_, true, false, true, true) => {
             word_count_from_reader_specialized::<_, true, false, true, true>(reader)
         }
+        // show_chars, show_lines, show_words
         (_, true, true, false, true) => {
             word_count_from_reader_specialized::<_, true, true, false, true>(reader)
         }
+        // show_chars, show_lines, show_max_line_length
         (_, true, true, true, false) => {
             word_count_from_reader_specialized::<_, true, true, true, false>(reader)
         }
+        // show_chars, show_lines, show_max_line_length, show_words
         (_, true, true, true, true) => {
             word_count_from_reader_specialized::<_, true, true, true, true>(reader)
         }