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ZSHCOMPWID(1)									    ZSHCOMPWID(1)

NAME
       zshcompwid - zsh completion widgets

DESCRIPTION
       The  shell's  programmable  completion  mechanism can be manipulated in two ways; here the
       low-level features supporting the newer, function-based mechanism are defined.  A complete
       set  of	shell  functions based on these features is described in zshcompsys(1), and users
       with no interest in adding to that system (or, potentially, writing their own -- see  dic-
       tionary	entry  for  `hubris') should skip the current section.	The older system based on
       the compctl builtin command is described in zshcompctl(1).

       Completion widgets are defined by the -C option to the zle builtin command provided by the
       zsh/zle module (see zshzle(1)). For example,

	      zle -C complete expand-or-complete completer

       defines	a widget named `complete'.  The second argument is the name of any of the builtin
       widgets	that  handle  completions:  complete-word,   expand-or-complete,   expand-or-com-
       plete-prefix, menu-complete, menu-expand-or-complete, reverse-menu-complete, list-choices,
       or delete-char-or-list.	Note that this will still work even if the widget in question has
       been re-bound.

       When this newly defined widget is bound to a key using the bindkey builtin command defined
       in the zsh/zle module (see zshzle(1)), typing that key will call the shell function  `com-
       pleter'.  This  function  is  responsible  for  generating  the possible matches using the
       builtins described below.  As with other ZLE widgets, the  function  is	called	with  its
       standard input closed.

       Once  the  function  returns,  the completion code takes over control again and treats the
       matches in the same manner as the specified builtin widget, in  this  case  expand-or-com-
       plete.

COMPLETION SPECIAL PARAMETERS
       The  parameters ZLE_REMOVE_SUFFIX_CHARS and ZLE_SPACE_SUFFIX_CHARS are used by the comple-
       tion mechanism, but are not special.  See Parameters Used By The Shell in zshparam(1).

       Inside completion widgets, and any functions called from them, some parameters  have  spe-
       cial meaning; outside these functions they are not special to the shell in any way.  These
       parameters are used to pass information between the completion  code  and  the  completion
       widget.	Some  of  the  builtin commands and the condition codes use or change the current
       values of these parameters.  Any existing values will be hidden during execution  of  com-
       pletion	widgets;  except  for  compstate,  the parameters are reset on each function exit
       (including nested function calls from within the completion widget) to the values they had
       when the function was entered.

       CURRENT
	      This is the number of the current word, i.e. the word the cursor is currently on in
	      the words array.	Note that this value is only correct if the ksharrays  option  is
	      not set.

       IPREFIX
	      Initially this will be set to the empty string.  This parameter functions like PRE-
	      FIX; it contains a string which precedes the one in PREFIX and  is  not  considered
	      part of the list of matches.  Typically, a string is transferred from the beginning
	      of PREFIX to the end of IPREFIX, for example:

		     IPREFIX=${PREFIX%%\=*}=
		     PREFIX=${PREFIX#*=}

	      causes the part of the prefix up to and including the first equal sign  not  to  be
	      treated as part of a matched string.  This can be done automatically by the compset
	      builtin, see below.

       ISUFFIX
	      As IPREFIX, but for a suffix that should not be considered  part	of  the  matches;
	      note that the ISUFFIX string follows the SUFFIX string.

       PREFIX Initially  this  will  be set to the part of the current word from the beginning of
	      the word up to the position of the cursor; it may be altered to give a common  pre-
	      fix for all matches.

       QIPREFIX
	      This  parameter  is  read-only  and contains the quoted string up to the word being
	      completed. E.g. when completing `"foo', this parameter contains the  double  quote.
	      If  the -q option of compset is used (see below), and the original string was `"foo
	      bar' with the cursor on the `bar', this parameter contains `"foo '.

       QISUFFIX
	      Like QIPREFIX, but containing the suffix.

       SUFFIX Initially this will be set to the part of the current word from the cursor position
	      to  the end; it may be altered to give a common suffix for all matches.  It is most
	      useful when the option COMPLETE_IN_WORD is set, as otherwise the whole word on  the
	      command line is treated as a prefix.

       compstate
	      This  is an associative array with various keys and values that the completion code
	      uses to exchange information with the completion widget.	The keys are:

	      all_quotes
		     The -q option of the compset builtin command (see	below)	allows	a  quoted
		     string  to  be  broken into separate words; if the cursor is on one of those
		     words, that word will be completed, possibly invoking  `compset  -q'  recur-
		     sively.   With  this  key it is possible to test the types of quoted strings
		     which are currently broken into parts in this fashion.  Its  value  contains
		     one  character for each quoting level.  The characters are a single quote or
		     a double quote for strings quoted with these characters, a dollars sign  for
		     strings  quoted  with $'...' and a backslash for strings not starting with a
		     quote character.  The first character in the value always corresponds to the
		     innermost quoting level.

	      context
		     This will be set by the completion code to the overall context in which com-
		     pletion is attempted. Possible values are:

		     array_value
			    when completing inside the value of an array parameter assignment; in
			    this case the words array contains the words inside the parentheses.

		     brace_parameter
			    when  completing  the  name  of  a parameter in a parameter expansion
			    beginning with ${.	This context will also	be  set  when  completing
			    parameter flags following ${(; the full command line argument is pre-
			    sented and the handler must test the value to be completed to  ascer-
			    tain that this is the case.

		     assign_parameter
			    when completing the name of a parameter in a parameter assignment.

		     command
			    when  completing  for a normal command (either in command position or
			    for an argument of the command).

		     condition
			    when completing inside a `[[...]]' conditional  expression;  in  this
			    case  the  words array contains only the words inside the conditional
			    expression.

		     math   when completing in a mathematical environment  such  as  a	`((...))'
			    construct.

		     parameter
			    when  completing  the  name  of  a parameter in a parameter expansion
			    beginning with $ but not ${.

		     redirect
			    when completing after a redirection operator.

		     subscript
			    when completing inside a parameter subscript.

		     value  when completing the value of a parameter assignment.

	      exact  Controls the behaviour when the REC_EXACT option is set.  It will be set  to
		     accept if an exact match would be accepted, and will be unset otherwise.

		     If  it  was  set when at least one match equal to the string on the line was
		     generated, the match is accepted.

	      exact_string
		     The string of an exact match if one was found, otherwise unset.

	      ignored
		     The number of words that were ignored because they matched one of	the  pat-
		     terns given with the -F option to the compadd builtin command.

	      insert This controls the manner in which a match is inserted into the command line.
		     On entry to the widget function, if it is unset the command line is  not  to
		     be changed; if set to unambiguous, any prefix common to all matches is to be
		     inserted; if set  to  automenu-unambiguous,  the  common  prefix  is  to  be
		     inserted  and the next invocation of the completion code may start menu com-
		     pletion (due to the AUTO_MENU option being set); if set to menu or  automenu
		     menu  completion will be started for the matches currently generated (in the
		     latter case this will happen because the AUTO_MENU is set).  The  value  may
		     also  contain  the  string `tab' when the completion code would normally not
		     really do completion, but only insert the TAB character.

		     On exit it may be set to any of the values above (where setting  it  to  the
		     empty string is the same as unsetting it), or to a number, in which case the
		     match whose number is given will be inserted into the command  line.   Nega-
		     tive  numbers  count  backward  from the last match (with `-1' selecting the
		     last match) and out-of-range values are wrapped around, so that a	value  of
		     zero  selects  the  last match and a value one more than the maximum selects
		     the first. Unless the value of this key  ends  in	a  space,  the	match  is
		     inserted  as  in  a  menu completion, i.e. without automatically appending a
		     space.

		     Both menu and automenu may also specify the number of the match  to  insert,
		     given  after  a colon.  For example, `menu:2' says to start menu completion,
		     beginning with the second match.

		     Note that a value containing the substring `tab' makes the matches generated
		     be ignored and only the TAB be inserted.

		     Finally,  it  may	also  be set to all, which makes all matches generated be
		     inserted into the line.

	      insert_positions
		     When the completion system inserts an  unambiguous  string  into  the  line,
		     there may be multiple places where characters are missing or where the char-
		     acter inserted differs from at least one match.  The value of this key  con-
		     tains  a  colon  separated  list of all these positions, as indexes into the
		     command line.

	      last_prompt
		     If this is set to a non-empty string for every match added,  the  completion
		     code will move the cursor back to the previous prompt after the list of com-
		     pletions has been displayed.  Initially this is set or  unset  according  to
		     the ALWAYS_LAST_PROMPT option.

	      list   This  controls  whether or how the list of matches will be displayed.  If it
		     is unset or empty they will never be listed; if its value begins with  list,
		     they  will  always  be listed; if it begins with autolist or ambiguous, they
		     will be listed when the AUTO_LIST	or  LIST_AMBIGUOUS  options  respectively
		     would normally cause them to be.

		     If  the  substring  force appears in the value, this makes the list be shown
		     even if there is only one match. Normally, the list would be shown  only  if
		     there are at least two matches.

		     The value contains the substring packed if the LIST_PACKED option is set. If
		     this substring is given for all matches added to a group,	this  group  will
		     show  the	LIST_PACKED  behavior.	The  same is done for the LIST_ROWS_FIRST
		     option with the substring rows.

		     Finally, if the value contains the string explanations, only the explanation
		     strings,  if  any, will be listed and if it contains messages, only the mes-
		     sages (added with the -x option of compadd) will be listed.  If it  contains
		     both  explanations  and  messages	both kinds of explanation strings will be
		     listed.  It will be set appropriately on entry to a  completion  widget  and
		     may be changed there.

	      list_lines
		     This  gives  the number of lines that are needed to display the full list of
		     completions.  Note that to calculate the total number of  lines  to  display
		     you  need	to  add  the  number of lines needed for the command line to this
		     value, this is available as the value of the BUFFERLINES special parameter.

	      list_max
		     Initially this is set to the value of the LISTMAX parameter.  It may be  set
		     to  any  other  value;  when the widget exits this value will be used in the
		     same way as the value of LISTMAX.

	      nmatches
		     The number of matches generated and accepted by the completion code so far.

	      old_insert
		     On entry to the widget this will be set to the number of the match of an old
		     list  of completions that is currently inserted into the command line. If no
		     match has been inserted, this is unset.

		     As with old_list, the value of this key will only	be  used  if  it  is  the
		     string  keep. If it was set to this value by the widget and there was an old
		     match inserted into the command line, this match will be  kept  and  if  the
		     value  of	the  insert  key specifies that another match should be inserted,
		     this will be inserted after the old one.

	      old_list
		     This is set to yes if there is still a valid list of completions from a pre-
		     vious  completion	at  the time the widget is invoked.  This will usually be
		     the case if and only if the previous editing operation was a completion wid-
		     get  or  one  of the builtin completion functions.  If there is a valid list
		     and it is also currently shown on the screen,  the  value	of  this  key  is
		     shown.

		     After the widget has exited the value of this key is only used if it was set
		     to keep.  In this case the completion code will continue  to  use	this  old
		     list.  If the widget generated new matches, they will not be used.

	      parameter
		     The  name of the parameter when completing in a subscript or in the value of
		     a parameter assignment.

	      pattern_insert
		     Normally this is set to menu, which specifies that menu completion  will  be
		     used  whenever a set of matches was generated using pattern matching.  If it
		     is set to any other non-empty string by the user and menu completion is  not
		     selected  by  other option settings, the code will instead insert any common
		     prefix for the generated matches as with normal completion.

	      pattern_match
		     Locally controls the behaviour given by the GLOB_COMPLETE option.	Initially
		     it  is  set  to `*' if and only if the option is set.  The completion widget
		     may set it to this value, to an empty string (which has the same  effect  as
		     unsetting	it),  or  to  any  other  non-empty  string.  If it is non-empty,
		     unquoted metacharacters on the command line will be treated as patterns;  if
		     it  is  `*', then additionally a wildcard `*' is assumed at the cursor posi-
		     tion; if it is empty or unset, metacharacters will be treated literally.

		     Note that the matcher specifications given to the	compadd  builtin  command
		     are not used if this is set to a non-empty string.

	      quote  When  completing  inside quotes, this contains the quotation character (i.e.
		     either a single quote, a double quote, or	a  backtick).	Otherwise  it  is
		     unset.

	      quoting
		     When  completing  inside  single  quotes,	this is set to the string single;
		     inside double quotes, the string double; inside backticks, the string  back-
		     tick.  Otherwise it is unset.

	      redirect
		     The redirection operator when completing in a redirection position, i.e. one
		     of <, >, etc.

	      restore
		     This is set to auto before a function is entered, which forces  the  special
		     parameters  mentioned  above  (words,  CURRENT, PREFIX, IPREFIX, SUFFIX, and
		     ISUFFIX) to be restored to their previous values when  the  function  exits.
		     If  a  function  unsets  it or sets it to any other string, they will not be
		     restored.

	      to_end Specifies the occasions on which the cursor is moved to the end of a  string
		     when  a  match is inserted.  On entry to a widget function, it may be single
		     if this will happen when a single unambiguous match was inserted or match if
		     it  will  happen  any time a match is inserted (for example, by menu comple-
		     tion; this is likely to be the effect of the ALWAYS_TO_END option).

		     On exit, it may be set to single as above.  It may also be set to always, or
		     to the empty string or unset; in those cases the cursor will be moved to the
		     end of the string always or never respectively.  Any other string is treated
		     as match.

	      unambiguous
		     This  key	is  read-only  and will always be set to the common (unambiguous)
		     prefix the completion code has generated for all matches added so far.

	      unambiguous_cursor
		     This gives the position the cursor would be placed at if the  common  prefix
		     in the unambiguous key were inserted, relative to the value of that key. The
		     cursor would be placed before the character whose index  is  given  by  this
		     key.

	      unambiguous_positions
		     This  contains  all positions where characters in the unambiguous string are
		     missing or where the character inserted differs from at  least  one  of  the
		     matches.	The  positions	are given as indexes into the string given by the
		     value of the unambiguous key.

	      vared  If completion is called while editing a line using the  vared  builtin,  the
		     value  of	this key is set to the name of the parameter given as an argument
		     to vared.	This key is only set while a vared command is active.

       words  This array contains the words present on the command line currently being edited.

COMPLETION BUILTIN COMMANDS
       compadd [ -akqQfenUld12C ] [ -F array ]
       [ -P prefix ] [ -S suffix ]
       [ -p hidden-prefix ] [ -s hidden-suffix ]
       [ -i ignored-prefix ] [ -I ignored-suffix ]
       [ -W file-prefix ] [ -d array ]
       [ -J name ] [ -V name ] [ -X explanation ] [ -x message ]
       [ -r remove-chars ] [ -R remove-func ]
       [ -D array ] [ -O array ] [ -A array ]
       [ -E number ]
       [ -M match-spec ] [ -- ] [ words ... ]

	      This builtin command can be used to add matches directly and control all the infor-
	      mation  the  completion  code stores with each possible match. The return status is
	      zero if at least one match was added and non-zero if no matches were added.

	      The completion code breaks the string to complete into seven fields in the order:

		     <ipre><apre><hpre><word><hsuf><asuf><isuf>

	      The first field is an ignored prefix taken from the command line, the  contents  of
	      the IPREFIX parameter plus the string given with the -i option. With the -U option,
	      only the string from the -i option is used. The field <apre> is an optional  prefix
	      string  given  with the -P option.  The <hpre> field is a string that is considered
	      part of the match but that should not be shown when listing completions, given with
	      the  -p  option; for example, functions that do filename generation might specify a
	      common path prefix this way.  <word> is the part of the match that should appear in
	      the list of completions, i.e. one of the words given at the end of the compadd com-
	      mand line. The suffixes <hsuf>,  <asuf>  and  <isuf>  correspond	to  the  prefixes
	      <hpre>, <apre> and <ipre> and are given by the options -s, -S and -I, respectively.

	      The supported flags are:

	      -P prefix
		     This gives a string to be inserted before the given words.  The string given
		     is not considered as part of the match and any shell  metacharacters  in  it
		     will not be quoted when the string is inserted.

	      -S suffix
		     Like -P, but gives a string to be inserted after the match.

	      -p hidden-prefix
		     This gives a string that should be inserted into the command line before the
		     match but that should not appear in the  list  of	matches.  Unless  the  -U
		     option  is  given,  this string must be matched as part of the string on the
		     command line.

	      -s hidden-suffix
		     Like `-p', but gives a string to insert after the match.

	      -i ignored-prefix
		     This gives a string to insert into the command line just before  any  string
		     given  with the `-P' option.  Without `-P' the string is inserted before the
		     string given with `-p' or directly before the match.

	      -I ignored-suffix
		     Like -i, but gives an ignored suffix.

	      -a     With this flag the words are taken as  names  of  arrays  and  the  possible
		     matches  are  their values.  If only some elements of the arrays are needed,
		     the words may also contain subscripts, as in `foo[2,-1]'.

	      -k     With this flag the words are taken as names of associative  arrays  and  the
		     possible matches are their keys.  As for -a, the words may also contain sub-
		     scripts, as in `foo[(R)*bar*]'.

	      -d array
		     This adds per-match display strings. The array should  contain  one  element
		     per  word	given.	The  completion  code will then display the first element
		     instead of the first word, and so on. The array may be given as the name  of
		     an  array parameter or directly as a space-separated list of words in paren-
		     theses.

		     If there are fewer display strings than words, the leftover  words  will  be
		     displayed	unchanged  and	if there are more display strings than words, the
		     leftover display strings will be silently ignored.

	      -l     This option only has an effect if used together with the -d option. If it is
		     given, the display strings are listed one per line, not arrayed in columns.

	      -o     This  option  only has an effect if used together with the -d option.  If it
		     is given, the order of the output is determined by the match strings;   oth-
		     erwise  it  is  determined by the display strings (i.e. the strings given by
		     the -d option).

	      -J name
		     Gives the name of the group of matches the words should be stored in.

	      -V name
		     Like -J but naming an unsorted group. These are in a  different  name  space
		     than groups created with the -J flag.

	      -1     If  given	together with the -V option, makes only consecutive duplicates in
		     the group be removed. If combined with the -J option, this  has  no  visible
		     effect.  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.

	      -X explanation
		     The  explanation  string will be printed with the list of matches, above the
		     group currently selected.

	      -x message
		     Like -X, but the message will be printed even if there are no matches in the
		     group.

	      -q     The suffix given with -S will be automatically 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.

	      -r remove-chars
		     This is a more versatile form of the -q option.  The suffix given with -S or
		     the slash automatically added after completing directories will be automati-
		     cally  removed  if  the  next  character typed inserts one of the characters
		     given in the remove-chars.  This string is parsed as a characters class  and
		     understands the backslash sequences used by the print command.  For example,
		     `-r "a-z\t"' removes the suffix if the next character typed inserts a  lower
		     case  character  or  a  TAB,  and `-r "^0-9"' removes the suffix if the next
		     character typed inserts anything but a digit. One extra  backslash  sequence
		     is  understood  in  this  string: `\-' stands for all characters that insert
		     nothing. Thus `-S "=" -q' is the same as `-S "=" -r "= \t\n\-"'.

		     This option may also be used without the -S option; then  any  automatically
		     added space will be removed when one of the characters in the list is typed.

	      -R remove-func
		     This  is  another form of the -r option. When a suffix has been inserted and
		     the completion accepted, the function remove-func will be called  after  the
		     next  character typed.  It is passed the length of the suffix as an argument
		     and can use the special parameters available  in  ordinary  (non-completion)
		     zle widgets (see zshzle(1)) to analyse and modify the command line.

	      -f     If  this  flag  is  given, all of the matches built from words are marked as
		     being the names of files.	They are not required to be actual filenames, but
		     if they are, and the option LIST_TYPES is set, the characters describing the
		     types of the files in the completion lists will be shown. This also forces a
		     slash to be added when the name of a directory is completed.

	      -e     This flag can be used to tell the completion code that the matches added are
		     parameter	names  for  a	parameter   expansion.	 This	will   make   the
		     AUTO_PARAM_SLASH and AUTO_PARAM_KEYS options be used for the matches.

	      -W file-prefix
		     This  string  is  a  pathname  that will be prepended to each of the matches
		     formed by the given words together with  any  prefix  specified  by  the  -p
		     option  to form a complete filename for testing.  Hence it is only useful if
		     combined with the -f flag, as the tests will not otherwise be performed.

	      -F array
		     Specifies an array containing patterns. Words matching one of these patterns
		     are ignored, i.e. not considered to be possible matches.

		     The  array  may  be the name of an array parameter or a list of literal pat-
		     terns enclosed in parentheses and quoted, as in `-F "(*?.o *?.h)"'.  If  the
		     name  of  an array is given, the elements of the array are taken as the pat-
		     terns.

	      -Q     This flag instructs the completion code not to quote any  metacharacters  in
		     the words when inserting them into the command line.

	      -M match-spec
		     This  gives  local  match	specifications	as described below in the section
		     `Completion Matching Control'. This option may be given more than once.   In
		     this case all match-specs given are concatenated with spaces between them to
		     form the specification string to use.  Note that they will only be  used  if
		     the -U option is not given.

	      -n     Specifies	that  the words added are to be used as possible matches, but are
		     not to appear in the completion listing.

	      -U     If this flag is given, all words given will be accepted and no matching will
		     be  done  by the completion code. Normally this is used in functions that do
		     the matching themselves.

	      -O array
		     If this option is given, the words are not added to the set of possible com-
		     pletions.	 Instead, matching is done as usual and all of the words given as
		     arguments that match the string on the command line will be  stored  in  the
		     array parameter whose name is given as array.

	      -A array
		     As  the  -O  option,  except  that instead of those of the words which match
		     being stored in array, the strings generated internally  by  the  completion
		     code  are	stored.  For  example,	with  a  matching  specification  of  `-M
		     "L:|no="', the string `nof' on the command line and the string `foo' as  one
		     of  the  words,  this option stores the string `nofoo' in the array, whereas
		     the -O option stores the `foo' originally given.

	      -D array
		     As with -O, the words are not added to  the  set  of  possible  completions.
		     Instead, the completion code tests whether each word in turn matches what is
		     on the line.  If the nth word does not match, the nth element of  the  array
		     is  removed.   Elements  for  which  the  corresponding  word is matched are
		     retained.

	      -C     This option adds a special match which expands to	all  other  matches  when
		     inserted into the line, even those that are added after this option is used.
		     Together with the -d option it is possible to specify a string  that  should
		     be  displayed in the list for this special match.	If no string is given, it
		     will be shown as a string containing the strings that would be inserted  for
		     the other matches, truncated to the width of the screen.

	      -E     This  option  adds number empty matches after the words have been added.  An
		     empty match takes up space in completion listings but will never be inserted
		     in  the  line  and can't be selected with menu completion or menu selection.
		     This makes empty matches only useful to format completion lists and to  make
		     explanatory  string be shown in completion lists (since empty matches can be
		     given display strings with the -d option).  And because all  but  one  empty
		     string would otherwise be removed, this option implies the -V and -2 options
		     (even if an explicit -J option is given).

	      -
	      --     This flag ends the list of flags and options. All arguments after it will be
		     taken as the words to use as matches even if they begin with hyphens.

	      Except  for  the	-M flag, if any of these flags is given more than once, the first
	      one (and its argument) will be used.

       compset -p number
       compset -P [ number ] pattern
       compset -s number
       compset -S [ number ] pattern
       compset -n begin [ end ]
       compset -N beg-pat [ end-pat ]
       compset -q
	      This command simplifies modification of the special parameters,  while  its  return
	      status allows tests on them to be carried out.

	      The options are:

	      -p number
		     If  the  contents	of the PREFIX parameter is longer than number characters,
		     the first number characters are removed from it and appended to the contents
		     of the IPREFIX parameter.

	      -P [ number ] pattern
		     If  the  value of the PREFIX parameter begins with anything that matches the
		     pattern, the matched portion is removed from PREFIX and appended to IPREFIX.

		     Without the optional number, the longest match is taken, but  if  number  is
		     given,  anything  up to the numberth match is moved.  If the number is nega-
		     tive, the numberth longest match is moved. For example, if  PREFIX  contains
		     the  string  `a=b=c', then compset -P '*\=' will move the string `a=b=' into
		     the IPREFIX parameter, but compset -P 1 '*\='  will  move	only  the  string
		     `a='.

	      -s number
		     As  -p,  but transfer the last number characters from the value of SUFFIX to
		     the front of the value of ISUFFIX.

	      -S [ number ] pattern
		     As -P, but match the last portion of SUFFIX and transfer the matched portion
		     to the front of the value of ISUFFIX.

	      -n begin [ end ]
		     If  the  current  word  position  as  specified  by the parameter CURRENT is
		     greater than or equal to begin, anything up to the beginth word  is  removed
		     from  the	words array and the value of the parameter CURRENT is decremented
		     by begin.

		     If the optional end is given, the modification is done only if  the  current
		     word  position  is  also  less than or equal to end. In this case, the words
		     from position end onwards are also removed from the words array.

		     Both begin and end may be negative to count backwards from the last  element
		     of the words array.

	      -N beg-pat [ end-pat ]
		     If  one of the elements of the words array before the one at the index given
		     by the value of the parameter CURRENT matches the pattern beg-pat, all  ele-
		     ments  up to and including the matching one are removed from the words array
		     and the value of CURRENT is changed to point to the same word in the changed
		     array.

		     If  the  optional	pattern end-pat is also given, and there is an element in
		     the words array matching this pattern, the parameters are modified  only  if
		     the index of this word is higher than the one given by the CURRENT parameter
		     (so that the matching word has to be after the cursor). In  this  case,  the
		     words starting with the one matching end-pat are also removed from the words
		     array. If words contains no word matching end-pat, the testing and modifica-
		     tion is performed as if it were not given.

	      -q     The  word	currently being completed is split on spaces into separate words,
		     respecting the usual shell quoting conventions.   The  resulting  words  are
		     stored in the words array, and CURRENT, PREFIX, SUFFIX, QIPREFIX, and QISUF-
		     FIX are modified to reflect the word part that is completed.

	      In all the above cases the return status is zero if  the	test  succeeded  and  the
	      parameters  were	modified  and  non-zero  otherwise.  This  allows one to use this
	      builtin in tests such as:

		     if compset -P '*\='; then ...

	      This forces anything up to and including the last equal sign to be ignored  by  the
	      completion code.

       compcall [ -TD ]
	      This  allows  the  use  of completions defined with the compctl builtin from within
	      completion widgets.  The list of matches	will  be  generated  as  if  one  of  the
	      non-widget completion functions (complete-word, etc.)  had been called, except that
	      only compctls given for specific commands are used. To force the code to	try  com-
	      pletions	defined  with  the  -T	option	of  compctl and/or the default completion
	      (whether defined by compctl -D or the builtin default) in the  appropriate  places,
	      the -T and/or -D flags can be passed to compcall.

	      The  return  status can be used to test if a matching compctl definition was found.
	      It is non-zero if a compctl was found and zero otherwise.

	      Note that this builtin is defined by the zsh/compctl module.

COMPLETION CONDITION CODES
       The following additional condition codes for use within the [[ ... ]] construct are avail-
       able in completion widgets.  These work on the special parameters.  All of these tests can
       also be performed by the compset builtin, but in the case of the condition codes the  con-
       tents of the special parameters are not modified.

       -prefix [ number ] pattern
	      true if the test for the -P option of compset would succeed.

       -suffix [ number ] pattern
	      true if the test for the -S option of compset would succeed.

       -after beg-pat
	      true if the test of the -N option with only the beg-pat given would succeed.

       -between beg-pat end-pat
	      true if the test for the -N option with both patterns would succeed.

COMPLETION MATCHING CONTROL
       It  is  possible by use of the -M option of the compadd builtin command to specify how the
       characters in the string to be completed (referred to here as the command line)	map  onto
       the characters in the list of matches produced by the completion code (referred to here as
       the trial completions). Note that this is not used if the command  line	contains  a  glob
       pattern	and the GLOB_COMPLETE option is set or the pattern_match of the compstate special
       association is set to a non-empty string.

       The match-spec given as the argument to the -M option (see `Completion  Builtin	Commands'
       above)  consists  of  one  or  more  matching  descriptions separated by whitespace.  Each
       description consists of a letter followed by a colon  and  then	the  patterns  describing
       which character sequences on the line match which character sequences in the trial comple-
       tion.  Any sequence of characters not handled in  this  fashion	must  match  exactly,  as
       usual.

       The  forms  of  match-spec understood are as follows. In each case, the form with an upper
       case initial character retains the string already typed on the command line as  the  final
       result  of completion, while with a lower case initial character the string on the command
       line is changed into the corresponding part of the trial completion.

       m:lpat=tpat
       M:lpat=tpat
	      Here, lpat is a pattern that matches on the command  line,  corresponding  to  tpat
	      which matches in the trial completion.

       l:lanchor|lpat=tpat
       L:lanchor|lpat=tpat
       l:lanchor||ranchor=tpat
       L:lanchor||ranchor=tpat
       b:lpat=tpat
       B:lpat=tpat
	      These  letters  are  for	patterns that are anchored by another pattern on the left
	      side. Matching for lpat and tpat is as for m and M, but the pattern lpat matched on
	      the command line must be preceded by the pattern lanchor.  The lanchor can be blank
	      to anchor the match to the start of the command line string; otherwise  the  anchor
	      can  occur  anywhere,  but must match in both the command line and trial completion
	      strings.

	      If no lpat is given but a ranchor is,  this  matches  the  gap  between  substrings
	      matched by lanchor and ranchor. Unlike lanchor, the ranchor only needs to match the
	      trial completion string.

	      The b and B forms are similar to l and L with an empty anchor, but  need	to  match
	      only the beginning of the trial completion or the word on the command line, respec-
	      tively.

       r:lpat|ranchor=tpat
       R:lpat|ranchor=tpat
       r:lanchor||ranchor=tpat
       R:lanchor||ranchor=tpat
       e:lpat=tpat
       E:lpat=tpat
	      As l, L, b and B, with the difference that the command line  and	trial  completion
	      patterns	are  anchored  on  the right side.  Here an empty ranchor and the e and E
	      forms force the match to the end of the trial completion or command line string.

       Each lpat, tpat or anchor is either an empty string or consists of a sequence  of  literal
       characters  (which may be quoted with a backslash), question marks, character classes, and
       correspondence classes; ordinary shell patterns are not used.   Literal	characters  match
       only  themselves,  question marks match any character, and character classes are formed as
       for globbing and match any character in the given set.

       Correspondence classes are defined like character classes, but with two differences:  they
       are  delimited by a pair of braces, and negated classes are not allowed, so the characters
       ! and ^ have no special meaning directly after the opening brace.  They	indicate  that	a
       range  of  characters on the line match a range of characters in the trial completion, but
       (unlike ordinary character classes) paired according to the corresponding position in  the
       sequence.   For	example, to make any ASCII lower case letter on the line match the corre-
       sponding upper case letter in the trial completion, you can use `m:{a-z}={A-Z}'	(however,
       see below for the recommended form for this).  More than one pair of classes can occur, in
       which case the first class before the = corresponds to the first after it, and so on.   If
       one  side  has  more such classes than the other side, the superfluous classes behave like
       normal character classes.  In anchor patterns correspondence classes also behave like nor-
       mal character classes.

       The standard `[:name:]' forms described for standard shell patterns, see the section FILE-
       NAME GENERATION in zshexpn(1), may appear in correspondence  classes  as  well  as  normal
       character classes.  The only special behaviour in correspondence classes is if the form on
       the left and the form on the right are each one of [:upper:], [:lower:].  In  these  cases
       the  character  in the word and the character on the line must be the same up to a differ-
       ence in case.  Hence to make any lower case character on the line match the  corresponding
       upper  case  character  in  the	trial completion you can use `m:{[:lower:]}={[:upper:]}'.
       Although the matching system does not yet handle multibyte characters, this is  likely  to
       be  a  future extension, at which point this syntax will handle arbitrary alphabets; hence
       this form, rather than the use of explicit ranges, is  the  recommended	form.	In  other
       cases  `[:name:]' forms are allowed.  If the two forms on the left and right are the same,
       the characters must match exactly.   In	remaining  cases,  the	corresponding  tests  are
       applied to both characters, but they are not otherwise constrained; any matching character
       in one set goes with any matching character in the other set:  this is equivalent  to  the
       behaviour of ordinary character classes.

       The pattern tpat may also be one or two stars, `*' or `**'. This means that the pattern on
       the command line can match any number of characters in the trial completion. In this  case
       the  pattern  must  be anchored (on either side); in the case of a single star, the anchor
       then determines how much of the trial completion is to be included -- only the  characters
       up  to  the  next  appearance  of  the  anchor will be matched. With two stars, substrings
       matched by the anchor can be matched, too.

       Examples:

       The keys of the options association defined by the parameter module are the  option  names
       in  all-lower-case form, without underscores, and without the optional no at the beginning
       even though the builtins setopt and unsetopt understand option names with upper case  let-
       ters,  underscores,  and the optional no.  The following alters the matching rules so that
       the prefix no and any underscore are ignored when trying to match  the  trial  completions
       generated and upper case letters on the line match the corresponding lower case letters in
       the words:

	      compadd -M 'L:|[nN][oO]= M:_= M:{[:upper:]}={[:lower:]}' - \
		${(k)options}

       The first part says that the pattern `[nN][oO]' at the beginning (the empty anchor  before
       the  pipe  symbol) of the string on the line matches the empty string in the list of words
       generated by completion, so it will be ignored if present. The second part does	the  same
       for  an underscore anywhere in the command line string, and the third part uses correspon-
       dence classes so that any upper case letter on the line matches	the  corresponding  lower
       case  letter  in the word. The use of the upper case forms of the specification characters
       (L and M) guarantees that what has already been typed on the command line  (in  particular
       the prefix no) will not be deleted.

       Note  that the use of L in the first part means that it matches only when at the beginning
       of both the command line string and the trial completion. I.e., the string  `_NO_f'  would
       not  be	completed  to `_NO_foo', nor would `NONO_f' be completed to `NONO_foo' because of
       the leading underscore or the second `NO' on the line which makes the  pattern  fail  even
       though they are otherwise ignored. To fix this, one would use `B:[nN][oO]=' instead of the
       first part. As described above, this matches at the beginning  of  the  trial  completion,
       independent  of	other  characters or substrings at the beginning of the command line word
       which are ignored by the same or other match-specs.

       The second example makes completion case insensitive.  This is just the	same  as  in  the
       option example, except here we wish to retain the characters in the list of completions:

	      compadd -M 'm:{[:lower:]}={[:upper:]}' ...

       This  makes  lower  case  letters match their upper case counterparts.  To make upper case
       letters match the lower case forms as well:

	      compadd -M 'm:{[:lower:][:upper:]}={[:upper:][:lower:]}' ...

       A nice example for the use of * patterns is partial word completion. Sometimes  you  would
       like  to  make  strings like `c.s.u' complete to strings like `comp.source.unix', i.e. the
       word on the command line consists of multiple parts, separated by a dot in  this  example,
       where  each part should be completed separately -- note, however, that the case where each
       part of the word, i.e. `comp', `source' and `unix' in this example,  is	to  be	completed
       from separate sets of matches is a different problem to be solved by the implementation of
       the completion widget.  The example can be handled by:

	      compadd -M 'r:|.=* r:|=*' \
		- comp.sources.unix comp.sources.misc ...

       The first specification says that lpat is the empty string, while anchor is a dot; tpat is
       *,  so  this can match anything except for the `.' from the anchor in the trial completion
       word.  So in `c.s.u', the matcher sees `c', followed by the empty string, followed by  the
       anchor  `.',  and  likewise  for the second dot, and replaces the empty strings before the
       anchors, giving `c[omp].s[ources].u[nix]', where the last part of the completion  is  just
       as normal.

       With   the   pattern   shown   above,   the   string  `c.u'  could  not	be  completed  to
       `comp.sources.unix' because the single star means that no dot (matched by the anchor)  can
       be  skipped.  By  using	two  stars  as in `r:|.=**', however, `c.u' could be completed to
       `comp.sources.unix'. This also shows that in some cases, especially if  the  anchor  is	a
       real  pattern,  like a character class, the form with two stars may result in more matches
       than one would like.

       The second specification is needed to make this work when the cursor is in the  middle  of
       the  string  on	the command line and the option COMPLETE_IN_WORD is set. In this case the
       completion code would normally try to match trial completions that end with the string  as
       typed  so  far, i.e. it will only insert new characters at the cursor position rather than
       at the end.  However in our example we would like the code to recognise matches which con-
       tain  extra  characters after the string on the line (the `nix' in the example).  Hence we
       say that the empty string at the end of the string on the line matches any  characters  at
       the end of the trial completion.

       More generally, the specification

	      compadd -M 'r:|[.,_-]=* r:|=*' ...

       allows one to complete words with abbreviations before any of the characters in the square
       brackets.  For example, to complete veryverylongfile.c  rather  than  veryverylongheader.h
       with the above in effect, you can just type very.c before attempting completion.

       The  specifications  with  both	a  left and a right anchor are useful to complete partial
       words whose parts are not separated by some special character. For example, in some places
       strings	have  to  be  completed  that  are formed `LikeThis' (i.e. the separate parts are
       determined by a leading upper case letter) or maybe  one  has  to  complete  strings  with
       trailing numbers. Here one could use the simple form with only one anchor as in:

	      compadd -M 'r:|[[:upper:]0-9]=* r:|=*' LikeTHIS FooHoo 5foo123 5bar234

       But with this, the string `H' would neither complete to `FooHoo' nor to `LikeTHIS' because
       in each case there is an upper case letter before the `H'  and  that  is  matched  by  the
       anchor.	Likewise,  a  `2'  would not be completed. In both cases this could be changed by
       using `r:|[[:upper:]0-9]=**', but then `H' completes to both `LikeTHIS' and `FooHoo' and a
       `2'  matches  the other strings because characters can be inserted before every upper case
       letter and digit. To avoid this one would use:

	      compadd -M 'r:[^[:upper:]0-9]||[[:upper:]0-9]=** r:|=*' \
		  LikeTHIS FooHoo foo123 bar234

       By using these two anchors, a `H' matches only upper case `H's that are	immediately  pre-
       ceded  by  something matching the left anchor `[^[:upper:]0-9]'. The effect is, of course,
       that `H' matches only the string `FooHoo', a `2' matches only `bar234' and so on.

       When using the completion system (see zshcompsys(1)), users can	define	match  specifica-
       tions  that  are  to  be  used for specific contexts by using the matcher and matcher-list
       styles. The values for the latter will be used everywhere.

COMPLETION WIDGET EXAMPLE
       The first step is to define the widget:

	      zle -C complete complete-word complete-files

       Then the widget can be bound to a key using the bindkey builtin command:

	      bindkey '^X\t' complete

       After that the shell function complete-files will be invoked after  typing  control-X  and
       TAB. The function should then generate the matches, e.g.:

	      complete-files () { compadd - * }

       This function will complete files in the current directory matching the current word.

zsh 5.0.2				December 21, 2012			    ZSHCOMPWID(1)
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