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- Introduction to Gofer APPENDIX F: INTERPRETER COMMAND SUMMARY
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- APPENDIX F: INTERPRETER COMMAND SUMMARY
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- Command Description
- ------- -----------
- <expr> Analyse expression for errors, typecheck and evaluate. If
- the expression has type Dialogue, execute as a program
- using the I/O facilities as described in section 12. If
- the expression has type String, evaluate and print result
- as a lazy list of characters. In any other case, the
- standard prelude function show' is applied to the
- expression and used to print the value of the result in
- the form of a string, as in the previous case.
-
- :t <expr> Analyse expression for errors, typecheck and print the
- :type <expr> translation and inferred type of the term.
- :T
-
- :q Exit Gofer interpreter.
- :quit
- :Q
-
- :? Display summary of interpreter commands.
- :h
- :H
-
- :l f1 .. fn Removes any previously loaded files of definitions and
- attempts to load the contents of the files f1 upto fn one
- after the other.
-
- :L Remove any previously loaded files of definitions. Only
- those functions and values defined in the standard prelude
- will still be be available.
-
- :load Equivalent forms of the :l command.
- :L
-
- :a f1 .. fn Load the contents of the files f1 upto fn in addition to
- any previously loaded files. If any of the files of
- definitions which have already been loaded have been
- modified since they were last read then then they are
- automatically reloaded before any of the files f1 upto fn
- are read.
-
- If successful, a command of the form ":l f1 ..fn" is
- equivalent to the sequence of commands:
- :l
- :a f1
- .
- .
- :a fn
-
- :also Equivalent forms of the :a command.
- :A
-
- :r Repeat the last load command, attempting to reload any
- files which have subsequently been modified. Since later
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- Introduction to Gofer APPENDIX F: INTERPRETER COMMAND SUMMARY
-
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- files may depend on the definitions in earlier ones, once
- one file has been reloaded, all subsequent files will also
- need to be reloaded.
-
- :reload Equivalent forms of the :r command.
- :R
-
- :e file Suspend current Gofer session and start an editor program
- to modify or view the named file. The Gofer session will
- be resumed when the editor program terminates, and any
- script files that have been changed will be reloaded
- automatically.
-
- Note that a separate editor program is required and that
- Gofer must be properly installed to use this feature. The
- default editor is usually vi (Calvin version 2.0 is a good
- substitute for a PC), although this may have been changed
- when your system was installed. In any case, you can
- always substitute an editor of your choice by setting the
- environment variable EDITOR to the name of your favourite
- editor program.
-
- There are a number of factors which will affect your
- choice of editor. On a slow machine, with only a limited
- amount of memory, you will probably need to choose a
- relatively small editor which can be loaded reasonably
- quickly and does not require too much memory. On a more
- powerful system, you may find it more convenient to use
- Gofer from a window based environment, running your editor
- in one window with Gofer in another.
-
- :e Using the :e command without specifying a particular file
- to be edited starts up an editor program as described
- above either for the file of definitions most recently
- loaded into Gofer or, if an error occurred whilst loading
- a file of definitions, for the file of definitions in
- which the error was last detected.
-
- With many editor programs, it is even possible to start
- the editor at the line where the error occurred. As
- before, it is possible to change the default behaviour of
- Gofer in this case by setting the environment variable
- EDITLINE to a command string which can be used to start
- the editor program with a given file at a specific line
- number. The positions in the string at which the file
- name and line number values should be inserted should be
- indicated by the strings "%s" and "%d" respectively, and
- may appear in either order. The default command string,
- which is used if EDITLINE is not set is "vi +%d %s".
-
- :edit Equivalent forms of the :e command.
- :E
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