(emacs)Two-Column


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Two-Column Editing
==================

   Two-column mode lets you conveniently edit two side-by-side columns
of text.  It uses two side-by-side windows, each showing its own buffer.

   There are three ways to enter two-column mode:

`C-x 6 2'
     Enter two-column mode with the current buffer on the left, and on
     the right, a buffer whose name is based on the current buffer's
     name (`tc-two-columns').  If the right-hand buffer doesn't already
     exist, it starts out empty; the current buffer's contents are not
     changed.

     This command is appropriate when the current buffer contains just
     one column and you want to add another column.

`C-x 6 s'
     Split the current buffer, which contains two-column text, into two
     buffers, and display them side by side (`tc-split').  The current
     buffer becomes the left-hand buffer, but the text in the right-hand
     column is moved into the right-hand buffer.  The current column
     specifies the split point.  Splitting starts with the current line
     and continues to the end of the buffer.

     This command is appropriate when you have a buffer that already
     contains two-column text, and you wish to separate the columns
     temporarily.

`C-x 6 b BUFFER RET'
     Enter two-column mode using the current buffer as the left-hand
     buffer, and using buffer BUFFER as the right-hand buffer
     (`tc-associate-buffer').

   `C-x 6 s' looks for a column separator which is a string that
appears on each line between the two columns.  You can specify the width
of the separator with a numeric argument to `C-x 6 s'; that many
characters, before point, constitute the separator string.  By default,
the width is 1, so the column separator is the character before point.

   When a line has the separator at the proper place, `C-x 6 s' puts
the text after the separator into the right-hand buffer, and deletes the
separator.  Lines that don't have the column separator at the proper
place remain unsplit; they stay in the left-hand buffer, and the
right-hand buffer gets an empty line to correspond.  (This is the way
to write a line which "spans both columns while in two-column mode:
write it in the left-hand buffer, and put an empty line in the
right-hand buffer.)

   It's not a good idea to use ordinary scrolling commands during
two-column editing, because that separates the two parts of each split
line.  Instead, use these special scroll commands:

`C-x 6 SPC'
     Scroll both buffers up, in lockstep (`tc-scroll-up').

`C-x 6 DEL'
     Scroll both buffers down, in lockstep (`tc-scroll-down').

`C-x 6 C-l'
     Recenter both buffers, in lockstep (`tc-recenter').

   When you have edited both buffers as you wish, merge them with `C-x
6 1' (`tc-merge').  This copies the text from the right-hand buffer as
a second column in the other buffer.  To go back to two-column editing,
use `C-x 6 s'.

   Use `C-x 6 d' to disassociate the two buffers, leaving each as it
stands (`tc-dissociate').  If the other buffer, the one not current
when you type `C-x 6 d', is empty, `C-x 6 d' kills it.


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