Artifact 8b21bcf8c76ddc30e0cc7d682f693f66462d9d87c648fd81bd29a81c8ab467cf:
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psl-1983/3-1/doc/nmode/nm-buffers.ibm
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2020-04-21 19:40:01
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— Add Reduce 3.0 to the historical section of the archive, and some more
files relating to version sof PSL from the early 1980s. Thanks are due to
Paul McJones and Nelson Beebe for these, as well as to all the original
authors.git-svn-id: https://svn.code.sf.net/p/reduce-algebra/code/historical@5328 2bfe0521-f11c-4a00-b80e-6202646ff360 (user: arthurcnorman@users.sourceforge.net, size: 7350) [annotate] [blame] [check-ins using] [more...]
,MOD - R 44X (11 April 1983) <PSL.NMODE-DOC>NM-BUFFERS.ibm PLA 97_LAS 80 0_FIR 2_INT 1 6.0_TYP 160 163 162 193_INP 12 101_MAR 2 ,END ,PRO 201 OUT 160_202 OUT 163_203 OUT 162_204 OUT 193 205 INP 12 101_206 INP 12 102 ,END ,DEFINE UNIT SPACE FUNCTION ,END 201/NMODE Manual (Using Multiple Buffers) Page 16-1 202/16. Using Multiple Buffers 201/When we speak of "the buffer", which contains the text you are editing, we have given the impression that there is only one. In fact, there may be many of them, each with its own body of text. At any time only one buffer can be 202/selected 201/and available for editing, but it isn't hard to switch to a different one. Each buffer individually remembers which file it is visiting, what modes are in effect, and whether there are any changes that need saving. C-X B Select or create a buffer. C-M-L Select previous buffer. C-X C-F Visit a file in its own buffer. C-X C-B List the existing buffers. C-X K Kill a buffer. Each buffer in NMODE has a single name, which normally doesn't change. A buffer's name can be any length. The name of the currently selected buffer, and the name of the file visited in it, are visible in the mode line when you are at top level. A newly started NMODE has only one buffer, named "Main". 202/16.1 Creating and Selecting Buffers 201/To create a new buffer, you need only think of a name for it (say, "FOO") and then do C-X B FOO<CR>, which is the command C-X B (Select Buffer) followed by the name. This makes a new, empty buffer and selects it for editing. The new buffer is not visiting any file, so if you try to save it you will be asked for the filename to use. Each buffer has its own major mode; the new buffer's major mode is taken from the value of the variable nmode-default-mode. Normally nmode-default-mode is text mode. To return to buffer FOO later after having switched to another, the same command C-X B FOO<CR> is used, since C-X B can tell whether a buffer named FOO exists already or not. It does not matter whether you use upper case or lower case in typing the name of a buffer. C-X B Main<CR> reselects the buffer Main that NMODE started out with. Just C-X B<CR> reselects the previous buffer. One can also return to the previous buffer with C-M-L (203/select-previous-buffer-command201/). This will select the previous buffer, if possible. Otherwise, it will select the MAIN buffer. You can also read a file into its own newly created buffer, all with one command: C-X C-F (203/find-file-command201/), followed by the filename. The name of the file (within its directory) becomes the buffer name. C-F stands for "Find", because if the specified file already resides in a buffer in your NMODE, that buffer is reselected. So you need not remember whether you have brought the file in already or not. A buffer created by C-X C-F can be reselected later with C-X B or C-X C-F, whichever you find more convenient. Nonexistent files can be created with C-X C-F just as they can be with C-X C-V. See Section 15.1 [Visiting], page 1. 201/Page 16-2 NMODE Manual (Using Existing Buffers) 202/16.2 Using Existing Buffers 201/To get a list of all the buffers that exist, do C-X C-B (203/buffer-browser-command201/). Each buffer's name, size, and visited filenames are printed. A star at the beginning of a line indicates a buffer which contains changes that have not been saved. If several buffers have stars, you should save some of them with M-X Save All Files (203/save-all-files-command201/). This finds all the buffers that need saving and asks about each one individually. Saving the buffers this way is much easier and more efficient than selecting each one and typing C-X C-S. M-X Rename Buffer<CR><new name><CR> (203/rename-buffer-command201/) changes the name of the currently selected buffer. If <new name> is the null string, a truncated version of the filename of the visited file is used as the new name of the buffer. The commands C-X A (203/append-to-buffer-command201/) and M-X Insert Buffer (203/insert-buffer-command201/) can be used to copy text from one buffer to another. See Section 11.3 [Copying], page 4. 202/16.3 Killing Buffers 201/After you use an NMODE for a while, it may fill up with buffers which you no longer need. Eventually you can reach a point where trying to create any more results in running out of memory space. So whenever it is convenient you should do M-X Kill Some Buffers, (203/kill-some-buffers-command201/) which asks about each buffer individually. You can say Y or N to kill it or not. Or you can say Control-R to take a look at it first. This gives you a recursive editing level in which you can move around and look at things. When you have seen enough to make up your mind, exit the recursive editing level with a y or n to kill or save the buffer. If you say to kill a buffer that needs saving, you will be asked whether it should be saved. You can kill the buffer FOO by doing C-X K FOO<CR> (203/kill-buffer-command201/). If the buffer being killed has been modified since it was last saved, NMODE will ask you to confirm your command to kill it. You can kill the selected buffer, a common thing to do if you use C-X C-F, by doing C-X K<CR>. If you kill the selected buffer, in any way, NMODE will move you to another buffer.