experimental new style completion

[Sven Wischnowsky <wischnow@xxxxxxxxxxxxxxxxxxxxxxx>]

Hello

Below is a first implementation of the new style completion stuff we
were discussing. This is *very* experimental, it may change
completely, in some places it may be not working, it may be slow,
wrong, not powerful enough or too powerful, it may be... This is just
to give you something to play with over the next two weeks ;-)

Comments:

The thing below contains a patch and a file called `example' which 
will be created in the Src directory. This file contains a first
implementation of the main loop for completion and everything else you 
need to start. There should be more examples for completion functions
for commands, though...
The patch will apply on top of 3.1.5-pws3 plus all recent patches or
on top of 3.1.5-pws4.

To use all this new stuff you define a completion widget (since this
name is already used for Peter's `zle -c' stuff I need a different
name, but during this mail I will use it...), e.g.:

  zle -c my-comp expand-or-complete main-complete

`my-comp' is the name of the widget to be defined, `main-complete' is
the name of a shell function that will be called from the completion
code to generate the matches. The `expand-or-complete' can be the name 
of any the well known names of widgets that call the completion
code. The newly defined widget will behave like the widget thus named, 
except for generating the matches (for which it uses the shell
function, not the compctl's).

[Peter, would this be interesting to use for your `zle -C' stuff?]

In fact the behaviour is inherited by using most of the existing code
(this is one of the reasons why the patch is so relatively small). The 
shell function will generate the matches, anything else, including
displaying the matches, inserting them into the command line, deciding 
to use RECEXACT, AUTOMENU, and whatever else is still done by the
shell itself.

To use the above widget you then use:

  bindkey `\C-i' my-comp

(Or whichever key you like.)

Inside the shell function the completion code sets some variables to
report context information and it makes available two new builtins to
produce the matches and a couple of condition codes.

The variables are:

  PREFIX   the prefix of the current word from the command line
  IPREFIX  an ignored prefix (see below)
  SUFFIX   the suffix of the current word
  COMMAND  the name of the command we are currently completing for
  CONTEXT  the context we are currently completing in, this can be
           any of:

             `cmd'    we are completing in command position
             `arg'    we are completing in argument position
	     `redir'  ... after a redirection operator
	     `math'   ... in a math environment
	     `subscr' ... in a subscript
	     `value'  ... in the value of an variable assignment
	     `cond'   ... inside `[[...]]'

  argv     the positional parameters are set to the *arguments* of the
           command we are completing for (*not* including the command
           name)
  CURRENT  this is the index into `argv' pointing to the current word
  NMATCHES this is the number of matches produced (and accepted) so far

These variables are settable, the example file contains two convenient 
aliases to save and restore them. The completion code uses a wrapper
function to rest them to their old values at the end of each function
executed from the completion widget.

The conditions work on the contents of these variables, probably
changing them, they are modelled directly after the `compctl -x'
condition code:

  -prefix str
     is true if PREFIX starts with str

  -iprefix str
    like `-prefix', but makes the matched portion be
    ignored; this is done by appending the matched
    portion to IPREFIX and removing it from PREFIX

  -position beg [end]
    is true if we are currently in position `beg' (or between `beg'
    and `end' if that is given); if `end' is given COMMAND, CONTEXT,
    CURRENT, and argv are changed so that they contain only the range
    of words between these positions
    (as always when one of these condition takes an integer argument
    an expression may be given, like `-position a+1')

  -word index str
    is true if the `index'th argument is `str'

  -mword index pat
    like `-word' but with pattern matching

  -current index str
  -mcurrent index pat
    like `-word' and `-mword' but the `index' is take relative to the
    current position

  -string str
  -string index str
    true if the current word contains `str'; anything up to the
    `index'th occurrence of `str' is ignored (or anything up to the
    last occurrence if no `index' is given, again this sets IPREFIX
    and PREFIX)

  -class str
  -class index str
    like `-string' but the `str' is taken as a character class

  -words min [max]
    true if we have at least `min' arguments (and less than or equal
    to `max' arguments if that is given)

  -between s1 s2
    true if we are between an argument equal to `s1' and before an
    argument equal to `s2' (if there is such an argument)

  -mbetween p1 p2
    like `-between' but with pattern matching

  -after str
    true if we are after an argument equal to `str'

  -mafter pat
    like `-after' but with pattern matching

  -nmatches num
    true if we have generated `num' matches

Of course, tests can also be done by using the normal condition stuff
and the above variables (probably changing them), but these condition
codes may be faster and/or easier to use.

The builtins are:

complist ...

  This gets almost the same arguments as compctl, except the more
  complicated ones (like xor'ed completions, `-x', `-l', ...).
  When using this builtin the completion code uses the current values
  of the variables above, so that the combination of this builtin and
  the condition codes make life really simple...

compadd [options] matches...

  This allows access to the structure used internally used for storing 
  matches. When using this builtin the variables are not used and the
  completion code does not check if the strings added match what is
  one the command line, so you should know what you are doing.

  Supported options are:

    -q, -Q, -U, -P str, -S str, -J name, -V name
      these are used like the options with the same names in compctl and 
      complist

    -f 
      if this option is given the strings are treated like filenames
      (showing files types with LISTTYPES)

    -n
      this keeps the strings from appearing in the list of matches

    -i str
      this gives an ignored previous to use when inserting the match;
      such a string is not listed and inserted before a prefix given
      with the `-p' option

    -p str
      this gives another prefix that is not listed; but it is inserted 
      and used for testing file types

    -s str
      like `-p' but giving a suffix

  Note that this builtin is the most experimental part. Here, almost
  everything may change and many things may still be not working.

I suggest to have a look at the example file to see how all this can
be used.

Mixed comments:

- I have put the whole thing into the compctl module for now.
- I haven't used an associative array for the variables since I would
  then like to put [LR]BUFFER and so on into it and I didn't want to
  change to many parts of the shell for this first version.
  Also: using separate variables makes handling them so easy...
- When using `complist' the completion code still does normal completion 
  after `~', `=', and `$' (unless that is in IPREFIX, of course).
- Also, when using `complist' the global matches defined by `compctl -M' 
  are used, this at least should be changed one day.
- Later we may add a way to access the matches produced and to control 
  what is done with the collected data (inserting, listing, ...)
- With `complist' you can make functions be called with `-K' and `-y'
  put they can't use `read' to get at the comamnd line data. This is
  because the new style completion uses a different way to store them
  (the above parameters).
- When using conditions that change the parameter values the behavior
  may be irritating since following tests use the changed values. To
  avoid this you have to put the test into a separte function so that
  the previous state is automatically restored by the completion code
  or you have to restore the state by hand. Since I expect that many
  users will want to put all their tests for a command in one function
  (making things better readable) restoring by hand and forgetting to
  do so in the right places will become inconvenient.
- The condition codes behave a bit different from their `compctl -x'
  counterparts since they can only access the arguments (not the
  command name).
- The attentive reader of the patch will notice some hunks in zsh.h
  and in mem.c. This implement a way to re-use older heaps. In fact
  there are functions that allow one to temporarily switch to another
  heap, go back to an older heap, and to temporarily switch to another 
  heap. The patch for zsh.h implements some macros like HEAPALLOC that 
  make it easy to use this mechanism.

Whew.

Ok. Have a look at it, if you like. Play with it if you like. And then 
I would be glad about all comments, suggestions, and criticisms I get.

Like Peter I will now leave for the next two weeks, so...

  fröhliche Weihnachten und einen guten Rutsch ins neue Jahr!

Bye
 Sven

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end

--
Sven Wischnowsky                         wischnow@xxxxxxxxxxxxxxxxxxxxxxx