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How does autoload work in the GNU operating system?
The autoload facility lets you register the existence of a function or macro, but put off loading the file that defines it. The first call to the function automatically loads the proper library, in order to install the real definition and other associated code, then runs the real definition as if it had been loaded all along.
What is the Magic autoload comment in Linux?
A magic autoload comment (often called an autoload cookie ) consists of ‘ ;;;###autoload ’, on a line by itself, just before the real definition of the function in its autoloadable source file. The command M-x update-file-autoloads writes a corresponding autoload call into loaddefs.el .
What is the default value for autoload in Emacs?
The value of this variable names an Emacs Lisp file where the autoload calls should go. The default value is loaddefs.el, but you can override that, e.g., in the local variables section of a .el file (see File Local Variables ). The autoload file is assumed to contain a trailer starting with a formfeed character.
When to use autoload in a Lisp program?
When to Use Autoload. There are two ways to set up an autoloaded function: by calling autoload, and by writing a “magic” comment in the source before the real definition. autoload is the low-level primitive for autoloading; any Lisp program can call autoload at any time.
What is the form of autoload in Emacs?
The autoload object has this form: In this case, “prolog” is the name of the file to load, 169681 refers to the documentation string in the emacs/etc/DOC file (see Documentation Basics ), t means the function is interactive, and nil that it is not a macro or a keymap. This function returns non- nil if object is an autoload object.
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How does AutoLISP auto load and run routines?
Load AutoLISP routines at start up and execute commands or functions at specific times during a drawing session. AutoCAD-based products load the contents of three user-definable files automatically: acad.lsp, acaddoc.lsp, and the MNL file that accompanies your current customization file.
What kind of files are loaded in AutoCAD?
AutoCAD-based products load the contents of three user-definable files automatically: acad.lsp, acaddoc.lsp, and the MNL file that accompanies your current customization file. By default, the acad.lspfile is loaded only once, when the program starts, whereas acaddoc.lspis loaded with each individual document (or drawing).