io Module

ask

str1 ⇒ str2

Prints str1 (prompt), reads a line from STDIN and places it on top of the stack as a string.

choose

((str1 quot1)+) str2 ⇒ a*

Prints str2, then prints all str1 included in the quotation prepended with a number, and waits from valid input from the user.

If the user enters a number that matches one of the choices, then the corresponding quotation quot1 is executed, otherwise the choice menu is displayed again until a valid choice is made.

clear

∅ ⇒ ∅

Clears the screen.

color

bool ⇒ ∅

Enables or disabled color output in terminal (enabled by default).

column-print

quot int ⇒ a

Prints all elements of quot to STDOUT, in int columns.

confirm

str ⇒ bool

Prints str (prompt) appending " [yes/no]: ", reads a line from STDIN and:

  • if it matches /^y(es)?$/i, puts true on the stack.
  • if it matches /^no?$/i, puts false on the stack.
  • Otherwise, it prints Invalid answer. Please enter 'yes' or 'no': and waits for a new answer.

debug

a ⇒ a

Prints a and a new line to STDOUT, if logging level is set to debug or lower.

error

a ⇒ a

Prints a and a new line to STDERR, if logging level is set to error or lower.

fatal

a ⇒ a

Prints a and a new line to STDERR, and exists the program with error code 100.

getchr

∅ ⇒ int

Reads single character from STDIN without waiting for ENTER key and places its ASCII code on top of the stack.

info

a ⇒ a

Prints a and a new line to STDOUT, if logging level is set to info or lower.

mapkey

quot 'sym ⇒ ∅

Maps the named key/key combination 'sym to the quotation quot, so that quot is executed when key 'sym is pressed.

Notes

  • At present, only the key names and sequences defined in the minline library are supported.
  • The quotation will be executed by a copy of the min interpreter created when the mapping was defined. In other words, quotations executed by key bindings will not affect the current stack.

Example

The following program:

(clear) 'ctrl+l io.mapkey

causes the CTRL+L key to clear the screen.

notice

a ⇒ a

Prints a and a new line to STDOUT, if logging level is set to notice (default) or lower.

password

∅ ⇒ str

Reads a line from STDIN displaying * for each typed character, and places it on top of the stack as a string.

putchr

str ⇒ a

Prints str to STDOUT without printing a new line (str must contain only one character).

unmapkey

'sym ⇒ ∅

Unmaps a previously-mapped key or key-combination 'sym, restoring the default mapping if available.

Notes

  • At present, only the key names and sequences defined in the minline library are supported.
  • At present, all the default mappings of min are those provided by the minline library.

warn

a ⇒ a

Prints a and a new line to STDERR, if logging level is set to warn or lower.