[not loaded]console_input.pl -- Support entering toplevel queries

This module implements complete_input/4, which is used notably by the command line editor library(edit) to perform context aware TAB completion. It is a seperate library such that other input scenarios can reuse this code.

 prolog:complete_input(+BeforeCursor:string, +AfterCursor:string, -Delete:atom, -Completions:list) is semidet[multifile]

Compute auto completions for the input line BeforeCursor+AfterCursor. Implemented completions

• Files<br>
  • Text starting '<prefix> (single quotes) is completed as a file. If there is a single matching file a terminating `'` is added.
  • If the start of the line is [<prefix> and text can be a non-quoted atom, look for Prolog files with this name. Directories can be inserted as / (unquoted), as long as each segment is a valid atom. If a single .pl file is found it is closed with ], without the extension.
  • Text starting library(<prefix> is completed as a library file using the same rules as [<prefix>, but looking in all library directories instead of the current directory.
• Atoms
  <prefix> is used to complete atoms that can be written without quotes (excluding symbol atoms such as -->) and are permanent, i.e., have references from clauses records, flags, foreign code, etc.
• Variables
  <Prefix> is completed as an atom if it is a valid variable name. It is completed with other atoms from the query being edited using the same search as Emacs dabbrev (Dynamic Abbreviation). $<Prefix> expands to saved toplevel variables.

Arguments:

Delete	- is an atom or string representing the text that is replaced by the completion
Completions	- is a list of elements of this shape: Atom Used for a plain completion without comment Atom - Comment Used for a completion with comment. This will be used for predicates.