zshcompctl - Online in the Cloud

PROGRAM:

NAME

zshcompctl - zsh programmable completion

DESCRIPTION

This version of zsh has two ways of performing completion of words on the command line.
New users of the shell may prefer to use the newer and more powerful system based on shell
functions; this is described in zshcompsys(1), and the basic shell mechanisms which
support it are described in zshcompwid(1). This manual entry describes the older compctl
command.

compctl [ -CDT ] options [ command ... ]
compctl [ -CDT ] options [ -x pattern options - ... -- ]
[ + options [ -x ... -- ] ... [+] ] [ command ... ]
compctl -M match-specs ...
compctl -L [ -CDTM ] [ command ... ]
compctl + command ...

Control the editor's completion behavior according to the supplied set of options.
Various editing commands, notably expand-or-complete-word, usually bound to tab, will
attempt to complete a word typed by the user, while others, notably delete-char-or-list,
usually bound to ^D in EMACS editing mode, list the possibilities; compctl controls what
those possibilities are. They may for example be filenames (the most common case, and
hence the default), shell variables, or words from a user-specified list.

COMMAND FLAGS

Completion of the arguments of a command may be different for each command or may use the
default. The behavior when completing the command word itself may also be separately
specified. These correspond to the following flags and arguments, all of which (except
for -L) may be combined with any combination of the options described subsequently in the
section `Option Flags':

command ...
controls completion for the named commands, which must be listed last on the
command line. If completion is attempted for a command with a pathname containing
slashes and no completion definition is found, the search is retried with the last
pathname component. If the command starts with a =, completion is tried with the
pathname of the command.

Any of the command strings may be patterns of the form normally used for filename
generation. These should be quoted to protect them from immediate expansion; for
example the command string 'foo*' arranges for completion of the words of any
command beginning with foo. When completion is attempted, all pattern completions
are tried in the reverse order of their definition until one matches. By default,
completion then proceeds as normal, i.e. the shell will try to generate more
matches for the specific command on the command line; this can be overridden by
including -tn in the flags for the pattern completion.

Note that aliases are expanded before the command name is determined unless the
COMPLETE_ALIASES option is set. Commands may not be combined with the -C, -D or -T
flags.

-C controls completion when the command word itself is being completed. If no compctl
-C command has been issued, the names of any executable command (whether in the
path or specific to the shell, such as aliases or functions) are completed.

-D controls default completion behavior for the arguments of commands not assigned any
special behavior. If no compctl -D command has been issued, filenames are
completed.

-T supplies completion flags to be used before any other processing is done, even
before processing for compctls defined for specific commands. This is especially
useful when combined with extended completion (the -x flag, see the section
`Extended Completion' below). Using this flag you can define default behavior
which will apply to all commands without exception, or you can alter the standard
behavior for all commands. For example, if your access to the user database is too
slow and/or it contains too many users (so that completion after `~' is too slow to
be usable), you can use

compctl -T -x 's[~] C[0,[^/]#]' -k friends -S/ -tn

to complete the strings in the array friends after a `~'. The C[...] argument is
necessary so that this form of ~-completion is not tried after the directory name
is finished.

-L lists the existing completion behavior in a manner suitable for putting into a
start-up script; the existing behavior is not changed. Any combination of the
above forms, or the -M flag (which must follow the -L flag), may be specified,
otherwise all defined completions are listed. Any other flags supplied are
ignored.

no argument
If no argument is given, compctl lists all defined completions in an abbreviated
form; with a list of options, all completions with those flags set (not counting
extended completion) are listed.

If the + flag is alone and followed immediately by the command list, the completion
behavior for all the commands in the list is reset to the default. In other words,
completion will subsequently use the options specified by the -D flag.

The form with -M as the first and only option defines global matching specifications (see
zshcompwid). The match specifications given will be used for every completion attempt
(only when using compctl, not with the new completion system) and are tried in the order
in which they are defined until one generates at least one match. E.g.:

compctl -M '' 'm:{a-zA-Z}={A-Za-z}'

This will first try completion without any global match specifications (the empty string)
and, if that generates no matches, will try case insensitive completion.

OPTION FLAGS

[ -fcFBdeaRGovNAIOPZEnbjrzu/12 ]
[ -k array ] [ -g globstring ] [ -s subststring ]
[ -K function ]
[ -Q ] [ -P prefix ] [ -S suffix ]
[ -W file-prefix ] [ -H num pattern ]
[ -q ] [ -X explanation ] [ -Y explanation ]
[ -y func-or-var ] [ -l cmd ] [ -h cmd ] [ -U ]
[ -t continue ] [ -J name ] [ -V name ]
[ -M match-spec ]

The remaining options specify the type of command arguments to look for during completion.
Any combination of these flags may be specified; the result is a sorted list of all the
possibilities. The options are as follows.

Simple Flags
These produce completion lists made up by the shell itself:

-f Filenames and file system paths.

-/ Just file system paths.

-c Command names, including aliases, shell functions, builtins and reserved words.

-F Function names.

-B Names of builtin commands.

-m Names of external commands.

-w Reserved words.

-a Alias names.

-R Names of regular (non-global) aliases.

-G Names of global aliases.

-d This can be combined with -F, -B, -w, -a, -R and -G to get names of disabled
functions, builtins, reserved words or aliases.

-e This option (to show enabled commands) is in effect by default, but may be combined
with -d; -de in combination with -F, -B, -w, -a, -R and -G will complete names of
functions, builtins, reserved words or aliases whether or not they are disabled.

-o Names of shell options (see zshoptions(1)).

-v Names of any variable defined in the shell.

-N Names of scalar (non-array) parameters.

-A Array names.

-I Names of integer variables.

-O Names of read-only variables.

-p Names of parameters used by the shell (including special parameters).

-Z Names of shell special parameters.

-E Names of environment variables.

-n Named directories.

-b Key binding names.

-j Job names: the first word of the job leader's command line. This is useful with
the kill builtin.

-r Names of running jobs.

-z Names of suspended jobs.

-u User names.

Flags with Arguments
These have user supplied arguments to determine how the list of completions is to be made
up:

-k array
Names taken from the elements of $array (note that the `$' does not appear on the
command line). Alternatively, the argument array itself may be a set of space- or
comma-separated values in parentheses, in which any delimiter may be escaped with a
backslash; in this case the argument should be quoted. For example,

compctl -k "(cputime filesize datasize stacksize
coredumpsize resident descriptors)" limit

-g globstring
The globstring is expanded using filename globbing; it should be quoted to protect
it from immediate expansion. The resulting filenames are taken as the possible
completions. Use `*(/)' instead of `*/' for directories. The fignore special
parameter is not applied to the resulting files. More than one pattern may be
given separated by blanks. (Note that brace expansion is not part of globbing. Use
the syntax `(either|or)' to match alternatives.)

-s subststring
The subststring is split into words and these words are than expanded using all
shell expansion mechanisms (see zshexpn(1)). The resulting words are taken as
possible completions. The fignore special parameter is not applied to the
resulting files. Note that -g is faster for filenames.

-K function
Call the given function to get the completions. Unless the name starts with an
underscore, the function is passed two arguments: the prefix and the suffix of the
word on which completion is to be attempted, in other words those characters before
the cursor position, and those from the cursor position onwards. The whole command
line can be accessed with the -c and -l flags of the read builtin. The function
should set the variable reply to an array containing the completions (one
completion per element); note that reply should not be made local to the function.
From such a function the command line can be accessed with the -c and -l flags to
the read builtin. For example,

function whoson { reply=(`users`); }
compctl -K whoson talk

completes only logged-on users after `talk'. Note that `whoson' must return an
array, so `reply=`users`' would be incorrect.

-H num pattern
The possible completions are taken from the last num history lines. Only words
matching pattern are taken. If num is zero or negative the whole history is
searched and if pattern is the empty string all words are taken (as with `*'). A
typical use is

compctl -D -f + -H 0 ''

which forces completion to look back in the history list for a word if no filename
matches.

Control Flags
These do not directly specify types of name to be completed, but manipulate the options
that do:

-Q This instructs the shell not to quote any metacharacters in the possible
completions. Normally the results of a completion are inserted into the command
line with any metacharacters quoted so that they are interpreted as normal
characters. This is appropriate for filenames and ordinary strings. However, for
special effects, such as inserting a backquoted expression from a completion array
(-k) so that the expression will not be evaluated until the complete line is
executed, this option must be used.

-P prefix
The prefix is inserted just before the completed string; any initial part already
typed will be completed and the whole prefix ignored for completion purposes. For
example,

compctl -j -P "%" kill

inserts a `%' after the kill command and then completes job names.

-S suffix
When a completion is found the suffix is inserted after the completed string. In
the case of menu completion the suffix is inserted immediately, but it is still
possible to cycle through the list of completions by repeatedly hitting the same
key.

-W file-prefix
With directory file-prefix: for command, file, directory and globbing completion
(options -c, -f, -/, -g), the file prefix is implicitly added in front of the
completion. For example,

compctl -/ -W ~/Mail maildirs

completes any subdirectories to any depth beneath the directory ~/Mail, although
that prefix does not appear on the command line. The file-prefix may also be of
the form accepted by the -k flag, i.e. the name of an array or a literal list in
parenthesis. In this case all the directories in the list will be searched for
possible completions.

-q If used with a suffix as specified by the -S option, this causes the suffix to be
removed if the next character typed is a blank or does not insert anything or if
the suffix consists of only one character and the next character typed is the same
character; this the same rule used for the AUTO_REMOVE_SLASH option. The option is
most useful for list separators (comma, colon, etc.).

-l cmd This option restricts the range of command line words that are considered to be
arguments. If combined with one of the extended completion patterns `p[...]',
`r[...]', or `R[...]' (see the section `Extended Completion' below) the range is
restricted to the range of arguments specified in the brackets. Completion is then
performed as if these had been given as arguments to the cmd supplied with the
option. If the cmd string is empty the first word in the range is instead taken as
the command name, and command name completion performed on the first word in the
range. For example,

compctl -x 'r[-exec,;]' -l '' -- find

completes arguments between `-exec' and the following `;' (or the end of the
command line if there is no such string) as if they were a separate command line.

-h cmd Normally zsh completes quoted strings as a whole. With this option, completion can
be done separately on different parts of such strings. It works like the -l option
but makes the completion code work on the parts of the current word that are
separated by spaces. These parts are completed as if they were arguments to the
given cmd. If cmd is the empty string, the first part is completed as a command
name, as with -l.

-U Use the whole list of possible completions, whether or not they actually match the
word on the command line. The word typed so far will be deleted. This is most
useful with a function (given by the -K option) which can examine the word
components passed to it (or via the read builtin's -c and -l flags) and use its own
criteria to decide what matches. If there is no completion, the original word is
retained. Since the produced possible completions seldom have interesting common
prefixes and suffixes, menu completion is started immediately if AUTO_MENU is set
and this flag is used.

-y func-or-var
The list provided by func-or-var is displayed instead of the list of completions
whenever a listing is required; the actual completions to be inserted are not
affected. It can be provided in two ways. Firstly, if func-or-var begins with a $
it defines a variable, or if it begins with a left parenthesis a literal array,
which contains the list. A variable may have been set by a call to a function
using the -K option. Otherwise it contains the name of a function which will be
executed to create the list. The function will be passed as an argument list all
matching completions, including prefixes and suffixes expanded in full, and should
set the array reply to the result. In both cases, the display list will only be
retrieved after a complete list of matches has been created.

Note that the returned list does not have to correspond, even in length, to the
original set of matches, and may be passed as a scalar instead of an array. No
special formatting of characters is performed on the output in this case; in
particular, newlines are printed literally and if they appear output in columns is
suppressed.

-X explanation
Print explanation when trying completion on the current set of options. A `%n' in
this string is replaced by the number of matches that were added for this
explanation string. The explanation only appears if completion was tried and there
was no unique match, or when listing completions. Explanation strings will be
listed together with the matches of the group specified together with the -X option
(using the -J or -V option). If the same explanation string is given to multiple -X
options, the string appears only once (for each group) and the number of matches
shown for the `%n' is the total number of all matches for each of these uses. In
any case, the explanation string will only be shown if there was at least one match
added for the explanation string.

The sequences %B, %b, %S, %s, %U, and %u specify output attributes (bold, standout,
and underline), %F, %f, %K, %k specify foreground and background colours, and
%{...%} can be used to include literal escape sequences as in prompts.

-Y explanation
Identical to -X, except that the explanation first undergoes expansion following
the usual rules for strings in double quotes. The expansion will be carried out
after any functions are called for the -K or -y options, allowing them to set
variables.

-t continue
The continue-string contains a character that specifies which set of completion
flags should be used next. It is useful:

(i) With -T, or when trying a list of pattern completions, when compctl would
usually continue with ordinary processing after finding matches; this can be
suppressed with `-tn'.

(ii) With a list of alternatives separated by +, when compctl would normally stop
when one of the alternatives generates matches. It can be forced to consider the
next set of completions by adding `-t+' to the flags of the alternative before the
`+'.

(iii) In an extended completion list (see below), when compctl would normally
continue until a set of conditions succeeded, then use only the immediately
following flags. With `-t-', compctl will continue trying extended completions
after the next `-'; with `-tx' it will attempt completion with the default flags,
in other words those before the `-x'.

-J name
This gives the name of the group the matches should be placed in. Groups are listed
and sorted separately; likewise, menu completion will offer the matches in the
groups in the order in which the groups were defined. If no group name is
explicitly given, the matches are stored in a group named default. The first time a
group name is encountered, a group with that name is created. After that all
matches with the same group name are stored in that group.

This can be useful with non-exclusive alternative completions. For example, in

compctl -f -J files -t+ + -v -J variables foo

both files and variables are possible completions, as the -t+ forces both sets of
alternatives before and after the + to be considered at once. Because of the -J
options, however, all files are listed before all variables.

-V name
Like -J, but matches within the group will not be sorted in listings nor in menu
completion. These unsorted groups are in a different name space from the sorted
ones, so groups defined as -J files and -V files are distinct.

-1 If given together with the -V option, makes only consecutive duplicates in the
group be removed. Note that groups with and without this flag are in different name
spaces.

-2 If given together with the -J or -V option, makes all duplicates be kept. Again,
groups with and without this flag are in different name spaces.

-M match-spec
This defines additional matching control specifications that should be used only
when testing words for the list of flags this flag appears in. The format of the
match-spec string is described in zshcompwid.

ALTERNATIVE COMPLETION

compctl [ -CDT ] options + options [ + ... ] [ + ] command ...

The form with `+' specifies alternative options. Completion is tried with the options
before the first `+'. If this produces no matches completion is tried with the flags after
the `+' and so on. If there are no flags after the last `+' and a match has not been found
up to that point, default completion is tried. If the list of flags contains a -t with a
+ character, the next list of flags is used even if the current list produced matches.

Additional options are available that restrict completion to some part of the command
line; this is referred to as `extended completion'.

EXTENDED COMPLETION

compctl [ -CDT ] options -x pattern options - ... --
[ command ... ]
compctl [ -CDT ] options [ -x pattern options - ... -- ]
[ + options [ -x ... -- ] ... [+] ] [ command ... ]

The form with `-x' specifies extended completion for the commands given; as shown, it may
be combined with alternative completion using `+'. Each pattern is examined in turn; when
a match is found, the corresponding options, as described in the section `Option Flags'
above, are used to generate possible completions. If no pattern matches, the options
given before the -x are used.

Note that each pattern should be supplied as a single argument and should be quoted to
prevent expansion of metacharacters by the shell.

A pattern is built of sub-patterns separated by commas; it matches if at least one of
these sub-patterns matches (they are `or'ed). These sub-patterns are in turn composed of
other sub-patterns separated by white spaces which match if all of the sub-patterns match
(they are `and'ed). An element of the sub-patterns is of the form `c[...][...]', where
the pairs of brackets may be repeated as often as necessary, and matches if any of the
sets of brackets match (an `or'). The example below makes this clearer.

The elements may be any of the following:

s[string]...
Matches if the current word on the command line starts with one of the strings
given in brackets. The string is not removed and is not part of the completion.

S[string]...
Like s[string] except that the string is part of the completion.

p[from,to]...
Matches if the number of the current word is between one of the from and to pairs
inclusive. The comma and to are optional; to defaults to the same value as from.
The numbers may be negative: -n refers to the n'th last word on the line.

c[offset,string]...
Matches if the string matches the word offset by offset from the current word
position. Usually offset will be negative.

C[offset,pattern]...
Like c but using pattern matching instead.

w[index,string]...
Matches if the word in position index is equal to the corresponding string. Note
that the word count is made after any alias expansion.

W[index,pattern]...
Like w but using pattern matching instead.

n[index,string]...
Matches if the current word contains string. Anything up to and including the
indexth occurrence of this string will not be considered part of the completion,
but the rest will. index may be negative to count from the end: in most cases,
index will be 1 or -1. For example,

compctl -s '`users`' -x 'n[1,@]' -k hosts -- talk

will usually complete usernames, but if you insert an @ after the name, names from
the array hosts (assumed to contain hostnames, though you must make the array
yourself) will be completed. Other commands such as rcp can be handled similarly.

N[index,string]...
Like n except that the string will be taken as a character class. Anything up to
and including the indexth occurrence of any of the characters in string will not be
considered part of the completion.

m[min,max]...
Matches if the total number of words lies between min and max inclusive.

r[str1,str2]...
Matches if the cursor is after a word with prefix str1. If there is also a word
with prefix str2 on the command line after the one matched by str1 it matches only
if the cursor is before this word. If the comma and str2 are omitted, it matches if
the cursor is after a word with prefix str1.

R[str1,str2]...
Like r but using pattern matching instead.

q[str]...
Matches the word currently being completed is in single quotes and the str begins
with the letter `s', or if completion is done in double quotes and str starts with
the letter `d', or if completion is done in backticks and str starts with a `b'.

EXAMPLE

compctl -u -x 's[+] c[-1,-f],s[-f+]'
-g '~/Mail/*(:t)' - 's[-f],c[-1,-f]' -f -- mail

This is to be interpreted as follows:

If the current command is mail, then

if ((the current word begins with + and the previous word is -f)
or (the current word begins with -f+)), then complete the
non-directory part (the `:t' glob modifier) of files in the directory
~/Mail; else

if the current word begins with -f or the previous word was -f, then
complete any file; else

complete user names.

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