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elisp: Case Changes

 
 31.18 Case Changes
 ==================
 
 The case change commands described here work on text in the current
 buffer.  Case Conversion, for case conversion functions that
 work on strings and characters.  Case Tables, for how to
 customize which characters are upper or lower case and how to convert
 them.
 
  -- Command: capitalize-region start end
      This function capitalizes all words in the region defined by START
      and END.  To capitalize means to convert each word’s first
      character to upper case and convert the rest of each word to lower
      case.  The function returns ‘nil’.
 
      If one end of the region is in the middle of a word, the part of
      the word within the region is treated as an entire word.
 
      When ‘capitalize-region’ is called interactively, START and END are
      point and the mark, with the smallest first.
 
           ---------- Buffer: foo ----------
           This is the contents of the 5th foo.
           ---------- Buffer: foo ----------
 
           (capitalize-region 1 37)
           ⇒ nil
 
           ---------- Buffer: foo ----------
           This Is The Contents Of The 5th Foo.
           ---------- Buffer: foo ----------
 
  -- Command: downcase-region start end
      This function converts all of the letters in the region defined by
      START and END to lower case.  The function returns ‘nil’.
 
      When ‘downcase-region’ is called interactively, START and END are
      point and the mark, with the smallest first.
 
  -- Command: upcase-region start end
      This function converts all of the letters in the region defined by
      START and END to upper case.  The function returns ‘nil’.
 
      When ‘upcase-region’ is called interactively, START and END are
      point and the mark, with the smallest first.
 
  -- Command: capitalize-word count
      This function capitalizes COUNT words after point, moving point
      over as it does.  To capitalize means to convert each word’s first
      character to upper case and convert the rest of each word to lower
      case.  If COUNT is negative, the function capitalizes the −COUNT
      previous words but does not move point.  The value is ‘nil’.
 
      If point is in the middle of a word, the part of the word before
      point is ignored when moving forward.  The rest is treated as an
      entire word.
 
      When ‘capitalize-word’ is called interactively, COUNT is set to the
      numeric prefix argument.
 
  -- Command: downcase-word count
      This function converts the COUNT words after point to all lower
      case, moving point over as it does.  If COUNT is negative, it
      converts the −COUNT previous words but does not move point.  The
      value is ‘nil’.
 
      When ‘downcase-word’ is called interactively, COUNT is set to the
      numeric prefix argument.
 
  -- Command: upcase-word count
      This function converts the COUNT words after point to all upper
      case, moving point over as it does.  If COUNT is negative, it
      converts the −COUNT previous words but does not move point.  The
      value is ‘nil’.
 
      When ‘upcase-word’ is called interactively, COUNT is set to the
      numeric prefix argument.
 

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