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eshell: Completion

 
 2.7 Completion
 ==============
 
 Eshell uses the pcomplete package for programmable completion, similar
 to that of other command shells.  Argument completion differs depending
 on the preceding command: for example, possible completions for ‘rmdir’
 are only directories, while ‘rm’ completions can be directories _and_
 files.  Eshell provides predefined completions for the built-in
 functions and some common external commands, and you can define your own
 for any command.
 
    Eshell completion also works for lisp forms and glob patterns.  If
 the point is on a lisp form, then <TAB> will behave similarly to
 completion in ‘elisp-mode’ and ‘lisp-interaction-mode’.  For glob
 patterns, If there are few enough possible completions of the patterns,
 they will be cycled when <TAB> is pressed, otherwise it will be removed
 from the input line and the possible completions will be listed.
 
    If you want to see the entire list of possible completions when it’s
 below the cycling threshold, press ‘M-?’.
 
 2.7.1 pcomplete
 ---------------
 
 Pcomplete, short for programmable completion, is the completion library
 originally written for Eshell, but usable for command completion(1) in
 other modes.
 
    Completions are defined as functions (with ‘defun’) named
 ‘pcomplete/COMMAND’, where ‘COMMAND’ is the name of the command for
 which this function provides completions; you can also name the function
 ‘pcomplete/MAJOR-MODE/COMMAND’ to define completions for a specific
 major mode.
 
    ---------- Footnotes ----------
 
    (1) Command completion as opposed to code completion, which is a
 beyond the scope of pcomplete.
 

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