Editor commands are initiated by one or more key sequences . A single key sequence usually involves holding down one of two specially defined modifier keys, while at the same time pressing another key which is usually a character key.
Mac OS users will be familiar with the use of the
Command key in key sequences such as
Command+C. These keys always work in the standard Mac OS way in the LispWorks editor. The remainder of this section describes the use of other modifier key.
When using Mac OS editor emulation,
Esc is the cancel gesture and you may not have an Emacs Meta key. Therefore LispWorks provides an alternate gesture to access editor commands:
Ctrl+M. For example, to invoke the command
Find Source for Dspec, type
Ctrl+M X Find Source for Dspec
You can make either the
Alt or the
Command key act as the Emacs Meta key. This setting is independent of whether you are using Emacs or Mac OS editor emulation. See the
LispWorks IDE User Guide
for instructions on changing editor emulation.
Some key sequences may require more than one key sequence. For example, the key sequence to save the current buffer to a file is
Ctrl+X Ctrl+S. Another multi-key sequence is
Ctrl+X S which saves all buffers to their relevant files. Note that in this case you do not press the
Control key while pressing
A few commands require both the
Meta key to be held down while pressing the character key.
Meta+Ctrl+L, used to select the previous buffer displayed, is one such command. If the
Esc key is being used in place of the
Meta key, then this key should be pressed
Ctrl+L part of the key sequence.
The key sequences used to execute commands, as described in the previous section, are only one way to execute an editor command. As a general rule, editor commands that are used frequently should involve as few key strokes as possible to allow for fast editing. The key sequences described above are quick and easy shortcuts for invoking commands.
Most editor commands can also be invoked explicitly by using their full names. For example, in the previous section we met the keystroke
Ctrl+A which moves the current point to the beginning of the line. This keystroke is called a
and is a shortcut for executing the command
Beginning of Line. To execute this command by name you must type
Meta+X followed by the full command name (
Meta+X itself is only a key binding for the command
Even though there may seem like a lot of typing to issue the extended version of a command, it is not generally necessary to type in the whole of a command to be executed. The
Tab key can be used to complete a partially typed in extended command. The editor extends the command name as far as possible when
Tab is used, and if the user is not sure of the rest of the command name, then pressing
Tab again provides a list of possible completions. The command can then be selected from this list.
An editor command can be supplied with an integer argument p which may alter the effect of that command. In most cases it means that the command is repeated p times. This argument is known as a prefix argument as it is supplied before the command to which it is to be applied. Prefix arguments have no effect on some commands.
See Using prefix arguments for information about using prefix arguments.
LispWorks Editor User Guide (Macintosh version) - 17 Aug 2017