Command -- the class of all commands

Synopsis

Usage:

Command g
Inputs:
- g, a function or a string
Outputs:
- a new command that will evaluate g() if g is a function, and will evaluate run g if g is a string

Description

A command behaves as a function does if it is followed by an adjacent expression that can serve as its argument or argument list. In addition, if it appears as the value of an expression typed by the user at top level (i.e., not in a file), then it gets executed with empty argument list.

i1 : (f = Command ( () -> 2^30 );)

i2 : f

o2 = 1073741824

i3 : (c = Command "date";)

i4 : c
Wed Nov 17 04:54:38 PM CST 2021

o4 = 0

Methods that use a command :

? Command (missing documentation)
"code(Command)" -- see code -- display source code
"Command Thing"
Command \ Set (missing documentation)
"methodOptions(Command)" -- see methodOptions(Function) -- recover the options used when a method function was created
"methods(Command)" -- see methods -- list methods
options(Command) -- get optional arguments and default values of functions and methods
Set / Command (missing documentation)
/// Command \\ Thing /// -- see Thing // Function -- apply a function
"Thing // Command" -- see Thing // Function -- apply a function
/// Command \ String /// -- see VisibleList / Function -- apply a function to elements of a list
/// Command \ VirtualTally /// -- see VisibleList / Function -- apply a function to elements of a list
/// Command \ VisibleList /// -- see VisibleList / Function -- apply a function to elements of a list
"List / Command" -- see VisibleList / Function -- apply a function to elements of a list
"String / Command" -- see VisibleList / Function -- apply a function to elements of a list
"VirtualTally / Command" -- see VisibleList / Function -- apply a function to elements of a list
"VisibleList / Command" -- see VisibleList / Function -- apply a function to elements of a list

Fixed objects of class `Command` :

clearAll -- forget everything
clearOutput -- forget output values
edit -- edit source code
exit -- exit the program
help -- view documentation nodes
infoHelp -- view documentation in Info format
listLocalSymbols -- display of local symbols and their values
listUserSymbols -- display the user's symbols
profileSummary -- display profiling data
quit -- quit the program
restart -- restart Macaulay2
showClassStructure -- display class structure
showStructure -- display parent structure
showUserStructure -- show parent structure for those types defined by user
viewHelp -- view online documentation in a web browser

For the programmer

The object Command is a self initializing type, with ancestor classes BasicList < Thing.