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psl-1983/3-1/doc/nmode/nm-editing.ibm
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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: 10947) [annotate] [blame] [check-ins using] [more...]
,MOD - R 44X (11 April 1983) <PSL.NMODE-DOC>NM-EDITING.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 (Basic Editing Commands) Page 4-1 202/4. Basic Editing Commands 201/We now give the basics of how to enter text, make corrections, and save the text in a file. If this material is new to you, you might learn it more easily by running the NTEACH program. 202/4.1 Inserting Text 201/To insert printing characters into the text you are editing, just type them. When the selected buffer is an editing buffer, all printing characters you type are inserted into the text at the cursor (that is, at 202/point201/), and the cursor moves forward. Any characters after the cursor move forward too. If the text in the buffer is FOOBAR, with the cursor before the B, then if you type XX, you get FOOXXBAR, with the cursor still before the B. To correct text you have just inserted, you can use Backspace. Backspace deletes the character 203/before 201/the cursor (not the one that the cursor is on top of or under; that is the character 203/after 201/the cursor). The cursor and all characters after it move backwards. Therefore, if you type a printing character and then type Backspace, they cancel out. To end a line and start typing a new one, type Return (Customizers, note: this runs the function 203/return-command201/). Return operates by inserting a line separator, so if you type Return in the middle of a line, you break the line in two. If you add too many characters to one line, without breaking it with a Return, the line will display a "!" at the extreme right margin. This does not stop you from adding further characters, but those characters will not be visible until the line is somehow broken, or until you scroll the window horizontally using C-X >. Direct insertion works for printing characters and space, but other characters act as editing commands and do not insert themselves. If you need to insert a control character, Altmode, Tab, Backspace or Rubout, you must 202/quote 201/it by typing the Control-Q (203/insert-next-character-command201/) command first. See Section 3 [Control], page 1. 202/4.2 Moving The Cursor 201/To do more than insert characters, you have to know how to move the cursor. Here are a few of the commands for doing that. C-A Move to the beginning of the line. C-E Move to the end of the line. C-F Move forward over one character. ESC-C Same as C-F. Many terminals have an arrow key pointing right which sends this escape sequence. 201/Page 4-2 NMODE Manual (Moving The Cursor) C-B Move backward over one character. ESC-D Same as C-B. Many terminals have an arrow key pointing left which sends this escape sequence. C-N Move down one line, vertically. If you start in the middle of one line, you end in the middle of the next. From the last line of text, it creates a new line. ESC-B Same as C-N except that it will not create a new line. Many terminals have an arrow key pointing down which sends this escape sequence. C-P Move up one line, vertically. ESC-A Same as C-P. Many terminals have an arrow key pointing up which sends this escape sequence. C-L Clear the screen and reprints everything. C-U C-L reprints just the line that the cursor is on. C-T Transpose two characters (the ones before and after the cursor). M-< Move to the top of your text. M-> Move to the end of your text. There is a special command: C-X C-N (203/set-goal-column-command201/), which affects how C-P, ESC-A, C-N, and ESC-B act. Without an argument, C-X C-N will store the current column so that the vertical movement commands will try to move into it when they move point up or down, regardless of the column that point is in prior to the vertical movement. To remove the goal column, give the C-X C-N command with an argument. There is a command, C-X = (203/what-cursor-position-command201/), which is normally used to obtain information about where one is in a buffer. If given an argument, however, it will treat the argument as a line-number and it will jump to the corresponding line. 202/4.3 Erasing Text 201/Backspace Delete the character before the cursor. C-D Delete the character after the cursor. C-K Kill to the end of the line. You already know about the Backspace command which deletes the character before the cursor. Another command, Control-D, deletes the character after the cursor, causing the rest of the text on the line to shift left. If Control-D is typed at the end of a line, that line and the next line are joined together. To erase a larger amount of text, use the Control-K command, which kills a line at a time. If Control-K is done at the beginning or middle of a line, it kills all the text up to the end of the line. If Control-K is done at the end of a line, it joins that line and the next line. See Section 11 [Killing], page 1, for more flexible ways of killing text. 201/NMODE Manual (Files) Page 4-3 202/4.4 Files 201/The commands above are sufficient for creating text in the NMODE buffer. The more advanced NMODE commands just make things easier. But to keep any text permanently you must put it in a 202/file201/. Files are the objects which the operating system uses for storing data for communication between different programs or to hold onto for a length of time. To tell NMODE to edit text in a file, choose a 202/filename201/, such as FOO, and type C-X C-V FOO<CR>. This 202/visits 201/the file FOO so that its contents appear on the screen for editing. You can make changes, and then 202/save 201/the file by typing C-X C-S. This makes the changes permanent and actually changes the file FOO. Until then, the changes are only inside your NMODE, and the file FOO is not really changed. If the file FOO doesn't exist, and you want to create it, visit it as if it did exist. When you save your text with C-X C-S the file will be created. Of course, there is a lot more to learn about using files. See Section 15 [Files], page 1. 202/4.5 Using Blank Lines Can Make Editing Faster 201/C-O Insert one or more blank lines after the cursor. C-X C-O Delete all but one of many consecutive blank lines. It is much more efficient to insert text at the end of a line than in the middle. So if you want to stick a new line before an existing one, the best way is to make a blank line there first and then type the text into it, rather than inserting the new text at the beginning of the existing line and finally inserting a line separator. Making the blank line first also makes the meaning of the text clearer while you are typing it in. To make a blank line, you can type Return and then C-B. But there is a single character for this: C-O (Customizers: this is the function 203/open-line-command201/) So, FOO<CR> is equivalent to C-O FOO C-F. If you want to insert many lines, you can type many C-O's at the beginning (or you can give C-O an argument to tell it how many blank lines to make. See Section 5 [Arguments], page 1, for how). As you then insert lines of text, you will notice that Return behaves strangely: it "uses up" the blank lines instead of pushing them down. If you don't use up all the blank lines, you can type C-X C-O (the function 203/delete-blank-lines-command201/) to get rid of all but one. When point is on a blank line, C-X C-O replaces all the blank lines around that one with a single blank line. When point is on a nonblank line, C-X C-O deletes any blank lines following that nonblank line.