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| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | Doc/Zsh/mod_zle.yo | 338 | ||||
| -rw-r--r-- | Doc/Zsh/zle.yo | 347 |
3 files changed, 352 insertions, 338 deletions
diff --git a/ChangeLog b/ChangeLog index e5cbb0c3f..46042f222 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,3 +1,8 @@ +2001-03-28 Peter Stephenson <pws@csr.com> + + * unposted: Doc/Zsh/zle.yo, Doc/Zsh/mod_zle.yo: move ZLE builtin + documentation from mod_zle.yo to zle.yo. + 2001-03-28 Sven Wischnowsky <wischnow@zsh.org> * Completion/Commands/_history_complete_word, diff --git a/Doc/Zsh/mod_zle.yo b/Doc/Zsh/mod_zle.yo index cc6080b3d..162beb4bf 100644 --- a/Doc/Zsh/mod_zle.yo +++ b/Doc/Zsh/mod_zle.yo @@ -4,342 +4,4 @@ The Zsh Line Editor, including the tt(bindkey) and tt(vared) builtins. The tt(zsh/zle) module contains the Zsh Line Editor. See ifzman(zmanref(zshzle))\ ifnzman(noderef(Zsh Line Editor))\ -. It also contains three related builtin commands: - -startitem() -findex(bindkey) -cindex(keys, rebinding) -cindex(rebinding keys) -cindex(keys, binding) -cindex(binding keys) -cindex(keymaps) -xitem(tt(bindkey) [ var(options) ] tt(-l)) -xitem(tt(bindkey) [ var(options) ] tt(-d)) -xitem(tt(bindkey) [ var(options) ] tt(-D) var(keymap) ...) -xitem(tt(bindkey) [ var(options) ] tt(-A) var(old-keymap new-keymap)) -xitem(tt(bindkey) [ var(options) ] tt(-N) var(new-keymap) [ var(old-keymap) ]) -xitem(tt(bindkey) [ var(options) ] tt(-m)) -xitem(tt(bindkey) [ var(options) ] tt(-r) var(in-string) ...) -xitem(tt(bindkey) [ var(options) ] tt(-s) var(in-string out-string) ...) -xitem(tt(bindkey) [ var(options) ] var(in-string command) ...) -item(tt(bindkey) [ var(options) ] [ var(in-string) ])( -tt(bindkey)'s options can be divided into three categories: keymap selection, -operation selection, and others. The keymap selection options are: - -startitem() -item(tt(-e))( -Selects keymap `tt(emacs)', and also links it to `tt(main)'. -) -item(tt(-v))( -Selects keymap `tt(viins)', and also links it to `tt(main)'. -) -item(tt(-a))( -Selects keymap `tt(vicmd)'. -) -item(tt(-M))( -The first non-option argument is used as a keymap name, -and does not otherwise count as an argument. -) -enditem() - -If a keymap selection is required and none of the options above are used, the -`tt(main)' keymap is used. Some operations do not permit a keymap to be -selected, namely: - -startitem() -item(tt(-l))( -List all existing keymap names. If the tt(-L) -option is also used, list in the form of tt(bindkey) -commands to create the keymaps. -) -item(tt(-d))( -Delete all existing keymaps and reset to the default state. -) -item(tt(-D) var(keymap) ...)( -Delete the named var(keymap)s. -) -item(tt(-A) var(old-keymap new-keymap))( -Make the var(new-keymap) name an alias for var(old-keymap), so that -both names refer to the same keymap. The names have equal standing; -if either is deleted, the other remains. If there is already a keymap -with the var(new-keymap) name, it is deleted. -) -item(tt(-N) var(new-keymap) [ var(old-keymap) ])( -Create a new keymap, named var(new-keymap). If a keymap already has that -name, it is deleted. If an var(old-keymap) name is given, the new keymap -is initialized to be a duplicate of it, otherwise the new keymap will -be empty. -) -enditem() - -To use a newly created keymap, it should be linked to tt(main). Hence -the sequence of commands to create and use a new keymap `tt(mymap)' -initialized from the tt(emacs) keymap (which remains unchanged) is: - -example(bindkey -N mymap emacs -bindkey -A mymap main) - -Note that while `tt(bindkey -A) var(newmap) tt(main)' will work when -var(newmap) is tt(emacs) or tt(viins), it will not work for tt(vicmd), as -switching from vi insert to command mode becomes impossible. - -The following operations act on the `tt(main)' keymap if no keymap -selection option was given: - -startitem() -item(tt(-m))( -Add the built-in set of meta-key bindings to the selected keymap. -Only keys that are unbound or bound to tt(self-insert) are affected. -) -item(tt(-r) var(in-string) ...)( -Unbind the specified var(in-string)s in the selected keymap. -This is exactly equivalent to binding the strings to tt(undefined-key). -When tt(-R) is also used, interpret the var(in-string)s as ranges. -) -item(tt(-s) var(in-string out-string) ...)( -Bind each var(in-string) to each var(out-string). -When var(in-string) is typed, var(out-string) will be -pushed back and treated as input to the line editor. -When tt(-R) is also used, interpret the var(in-string)s as ranges. -) -item(var(in-string command) ...)( -Bind each var(in-string) to each var(command). -When tt(-R) is used, interpret the var(in-string)s as ranges. -) -item([ var(in-string) ])( -List key bindings. If an var(in-string) is specified, the binding of -that string in the selected keymap is displayed. Otherwise, all key -bindings in the selected keymap are displayed. (As a special case, -if the tt(-e) or tt(-v) option is used alone, the keymap is em(not) -displayed - the implicit linking of keymaps is the only thing that -happens.) - -When the tt(-L) option is used, the list is in the form of tt(bindkey) -commands to create the key bindings. -) -enditem() - -When the tt(-R) option is used as noted above, a valid range consists of -two characters, with an optional `tt(-)' between them. All characters -between the two specified, inclusive, are bound as specified. - -For either var(in-string) or var(out-string), the following -escape sequences are recognised: - -startsitem() -sitem(tt(\a))(bell character) -sitem(tt(\b))(backspace) -sitem(tt(\e), tt(\E))(escape) -sitem(tt(\f))(form feed) -sitem(tt(\n))(linefeed (newline)) -sitem(tt(\r))(carriage return) -sitem(tt(\t))(horizontal tab) -sitem(tt(\v))(vertical tab) -sitem(tt(\)var(NNN))(character code in octal) -sitem(tt(\x)var(NN))(character code in hexadecimal) -sitem(tt(\M)[tt(-)]var(X))(character with meta bit set) -sitem(tt(\C)[tt(-)]var(X))(control character) -sitem(tt(^)var(X))(control character) -endsitem() - -In all other cases, `tt(\)' escapes the following character. Delete is -written as `tt(^?)'. Note that `tt(\M^?)' and `tt(^\M?)' are not the same, -and that (unlike emacs), the bindings `tt(\M-)var(X)' and `tt(\e)var(X)' -are entirely distinct, although they are initialized to the same bindings -by `tt(bindkey -m)'. -) -findex(vared) -cindex(parameters, editing) -cindex(editing parameters) -item(tt(vared) [ tt(-Aache) ] [ tt(-p) var(prompt) ] [ tt(-r) var(rprompt) ] var(name))( -The value of the parameter var(name) is loaded into the edit -buffer, and the line editor is invoked. When the editor exits, -var(name) is set to the string value returned by the editor. -When the tt(-c) flag is given, the parameter is created if it doesn't -already exist. The tt(-a) flag may be given with tt(-c) to create -an array parameter, or the tt(-A) flag to create an associative array. -If the type of an existing parameter does not match the type to be -created, the parameter is unset and recreated. - -If an array or array slice is being edited, separator characters as defined -in tt($IFS) will be shown quoted with a backslash, as will backslashes -themselves. Conversely, when the edited text is split into an array, a -backslash quotes an immediately following separator character or backslash; -no other special handling of backslashes, or any handling of quotes, is -performed. - -Individual elements of existing array or associative array parameters -may be edited by using subscript syntax on var(name). New elements are -created automatically, even without tt(-c). - -If the tt(-p) flag is given, the following string will be taken as -the prompt to display at the left. If the tt(-r) flag is given, -the following string gives the prompt to display at the right. If the -tt(-h) flag is specified, the history can be accessed from ZLE. If the -tt(-e) flag is given, typing tt(^D) (Control-D) on an empty line -causes tt(vared) to exit immediately with a non-zero return value. -) -findex(zle) -cindex(widgets, rebinding) -cindex(rebinding widgets) -cindex(widgets, binding) -cindex(binding widgets) -cindex(widgets, invoking) -cindex(invoking widgets) -cindex(widgets, calling) -cindex(calling widgets) -cindex(widgets, defining) -cindex(defining widgets) -xitem(tt(zle) tt(-l) [ tt(-L) | tt(-a) ] [ var(string) ... ]) -xitem(tt(zle) tt(-D) var(widget) ...) -xitem(tt(zle) tt(-A) var(old-widget) var(new-widget)) -xitem(tt(zle) tt(-N) var(widget) [ var(function) ]) -xitem(tt(zle) tt(-C) var(widget) var(completion-widget) var(function)) -xitem(tt(zle) tt(-R) [ tt(-c) ] [ var(display-string) ] [ var(string) ... ]) -xitem(tt(zle) tt(-M) var(string)) -xitem(tt(zle) tt(-U) var(string)) -xitem(tt(zle) tt(-I)) -xitem(tt(zle) var(widget) tt([ -n) var(num) tt(]) tt([ -N ]) var(args) ...) -item(tt(zle))( -The tt(zle) builtin performs a number of different actions concerning -ZLE. Which operation it performs depends on its options: - -startitem() -item(tt(-l) [ tt(-L) | tt(-a) ])( -List all existing user-defined widgets. If the tt(-L) -option is used, list in the form of tt(zle) -commands to create the widgets. - -When combined with the tt(-a) option, all widget names are listed, -including the builtin ones. In this case the tt(-L) option is ignored. - -If at least one var(string) is given, nothing will be printed but the -return status will be zero if all var(string)s are names of existing -widgets (or of user-defined widgets if the tt(-a) flag is not given) -and non-zero if at least one var(string) is not a name of an defined -widget. -) -item(tt(-D) var(widget) ...)( -Delete the named var(widget)s. -) -item(tt(-A) var(old-widget) var(new-widget))( -Make the var(new-widget) name an alias for var(old-widget), so that -both names refer to the same widget. The names have equal standing; -if either is deleted, the other remains. If there is already a widget -with the var(new-widget) name, it is deleted. -) -item(tt(-N) var(widget) [ var(function) ])( -Create a user-defined widget. If there is already a widget with the -specified name, it is overwritten. When the new -widget is invoked from within the editor, the specified shell var(function) -is called. If no function name is specified, it defaults to -the same name as the widget. For further information, see the section -em(Widgets) in -ifzman(zmanref(zshzle))\ -ifnzman(noderef(Zsh Line Editor))\ -. -) -cindex(completion widgets, creating) -item(tt(-C) var(widget) var(completion-widget) var(function))( -Create a user-defined completion widget named var(widget). The -completion widget will behave like the built-in completion-widget -whose name is given as var(completion-widget). To generate the -completions, the shell function var(function) will be called. -For further information, see -ifzman(zmanref(zshcompwid))\ -ifnzman(noderef(Completion Widgets))\ . -) -item(tt(-R) [ tt(-c) ] [ var(display-string) ] [ var(string) ... ])( -Redisplay the command line; this is to be called from within a user-defined -widget to allow changes to become visible. If a var(display-string) is -given and not empty, this is shown in the status line (immediately -below the line being edited). - -If the optional var(string)s are given they are listed below the -prompt in the same way as completion lists are printed. If no -var(string)s are given but the tt(-c) option is used such a list is -cleared. - -Note that this option is only useful for widgets that do not exit -immediately after using it because the strings displayed will be erased -immediately after return from the widget. - -This command can safely be called outside user defined widgets; if zle is -active, the display will be refreshed, while if zle is not active, the -command has no effect. In this case there will usually be no other -arguments. The status is zero if zle was active, else one. -) -item(tt(-M) var(string))( -As with the tt(-R) option, the var(string) will be displayed below the -command line; unlike the tt(-R) option, the string will not be put into -the status line but will instead be printed normally below the -prompt. This means that the var(string) will still be displayed after -the widget returns (until it is overwritten by subsequent commands). -) -item(tt(-U) var(string))( -This pushes the characters in the var(string) onto the input stack of -ZLE. After the widget currently executed finishes ZLE will behave as -if the characters in the var(string) were typed by the user. - -As ZLE uses a stack, if this option is used repeatedly -the last string pushed onto the stack will be processed first. However, -the characters in each var(string) will be processed in the order in which -they appear in the string. -) -item(tt(-I))( -Unusually, this option is only useful em(outside) ordinary widget functions. -It invalidates the current zle display in preparation for output; usually -this will be from a trap function. It has no effect if zle is not -active. When a trap exits, the shell checks to see if the display needs -restoring, hence the following will print output in such a way as not to -disturb the line being edited: - -example(TRAPUSR1() { - # Invalidate zle display - zle -I - # Show output - print Hello -}) - -Note that there are better ways of manipulating the display from within zle -widgets. In general, the trap function may need to test whether zle is -loaded before using this method; if it is not, there is no point in loading -it specially since the line editor will not be active. - -The status is zero if zle was active, else one. -) -item(var(widget) tt([ -n) var(num) tt(]) tt([ -N ]) var(args) ...)( -Invoke the specified widget. This can only be done when ZLE is -active; normally this will be within a user-defined widget. - -With the options tt(-n) and tt(-N), the current numerical argument will be -saved and then restored after the call to tt(widget); `tt(-n) var(num)' -sets the numerical argument temporarily to var(num), while `tt(-N)' sets it -to the default, i.e. as if there were none. - -Any further arguments will be passed to the widget. If it is a shell -function, these are passed down as positional parameters; for builtin -widgets it is up to the widget in question what it does with them. -Currently arguments are only handled by the incremental-search commands, -the tt(history-search-forward) and tt(-backward) and the corresponding -functions prefixed by tt(vi-), and by tt(universal-argument). No error is -flagged if the command does not use the arguments, or only uses some of -them. - -The return status reflects the success or failure of the operation carried -out by the widget, or if it is a user-defined widget the return status of -the shell function. - -A non-zero return status causes the shell to beep when the widget exits, -unless the tt(BEEP) options was unset or the widget was called via the -tt(zle) command. Thus if a user defined widget requires an immediate beep, -it should call the tt(beep) widget directly. -) -enditem() - -With no options and no arguments, only the return status will be -set. It is zero if ZLE is currently active and widgets could be -invoked using this builtin command and non-zero if ZLE is not active. -) -enditem() diff --git a/Doc/Zsh/zle.yo b/Doc/Zsh/zle.yo index e0c13da72..7c30b6802 100644 --- a/Doc/Zsh/zle.yo +++ b/Doc/Zsh/zle.yo @@ -78,6 +78,353 @@ and the command reading process starts again using these fake keystrokes. This input can itself invoke further replacement strings, but in order to detect loops the process will be stopped if there are twenty such replacements without a real command being read. + +sect(Zle Builtins) +cindex(zle, builtin commands) +The ZLE module contains three related builtin commands. The tt(bindkey) +command manipulates keymaps and key bindings; the tt(vared) command invokes +ZLE on the value of a shell parameter; and the tt(zle) command manipulates +editing widgets and allows command line access to ZLE commands from within +shell functions. + +startitem() +findex(bindkey) +cindex(keys, rebinding) +cindex(rebinding keys) +cindex(keys, binding) +cindex(binding keys) +cindex(keymaps) +xitem(tt(bindkey) [ var(options) ] tt(-l)) +xitem(tt(bindkey) [ var(options) ] tt(-d)) +xitem(tt(bindkey) [ var(options) ] tt(-D) var(keymap) ...) +xitem(tt(bindkey) [ var(options) ] tt(-A) var(old-keymap new-keymap)) +xitem(tt(bindkey) [ var(options) ] tt(-N) var(new-keymap) [ var(old-keymap) ]) +xitem(tt(bindkey) [ var(options) ] tt(-m)) +xitem(tt(bindkey) [ var(options) ] tt(-r) var(in-string) ...) +xitem(tt(bindkey) [ var(options) ] tt(-s) var(in-string out-string) ...) +xitem(tt(bindkey) [ var(options) ] var(in-string command) ...) +item(tt(bindkey) [ var(options) ] [ var(in-string) ])( +tt(bindkey)'s options can be divided into three categories: keymap selection, +operation selection, and others. The keymap selection options are: + +startitem() +item(tt(-e))( +Selects keymap `tt(emacs)', and also links it to `tt(main)'. +) +item(tt(-v))( +Selects keymap `tt(viins)', and also links it to `tt(main)'. +) +item(tt(-a))( +Selects keymap `tt(vicmd)'. +) +item(tt(-M))( +The first non-option argument is used as a keymap name, +and does not otherwise count as an argument. +) +enditem() + +If a keymap selection is required and none of the options above are used, the +`tt(main)' keymap is used. Some operations do not permit a keymap to be +selected, namely: + +startitem() +item(tt(-l))( +List all existing keymap names. If the tt(-L) +option is also used, list in the form of tt(bindkey) +commands to create the keymaps. +) +item(tt(-d))( +Delete all existing keymaps and reset to the default state. +) +item(tt(-D) var(keymap) ...)( +Delete the named var(keymap)s. +) +item(tt(-A) var(old-keymap new-keymap))( +Make the var(new-keymap) name an alias for var(old-keymap), so that +both names refer to the same keymap. The names have equal standing; +if either is deleted, the other remains. If there is already a keymap +with the var(new-keymap) name, it is deleted. +) +item(tt(-N) var(new-keymap) [ var(old-keymap) ])( +Create a new keymap, named var(new-keymap). If a keymap already has that +name, it is deleted. If an var(old-keymap) name is given, the new keymap +is initialized to be a duplicate of it, otherwise the new keymap will +be empty. +) +enditem() + +To use a newly created keymap, it should be linked to tt(main). Hence +the sequence of commands to create and use a new keymap `tt(mymap)' +initialized from the tt(emacs) keymap (which remains unchanged) is: + +example(bindkey -N mymap emacs +bindkey -A mymap main) + +Note that while `tt(bindkey -A) var(newmap) tt(main)' will work when +var(newmap) is tt(emacs) or tt(viins), it will not work for tt(vicmd), as +switching from vi insert to command mode becomes impossible. + +The following operations act on the `tt(main)' keymap if no keymap +selection option was given: + +startitem() +item(tt(-m))( +Add the built-in set of meta-key bindings to the selected keymap. +Only keys that are unbound or bound to tt(self-insert) are affected. +) +item(tt(-r) var(in-string) ...)( +Unbind the specified var(in-string)s in the selected keymap. +This is exactly equivalent to binding the strings to tt(undefined-key). +When tt(-R) is also used, interpret the var(in-string)s as ranges. +) +item(tt(-s) var(in-string out-string) ...)( +Bind each var(in-string) to each var(out-string). +When var(in-string) is typed, var(out-string) will be +pushed back and treated as input to the line editor. +When tt(-R) is also used, interpret the var(in-string)s as ranges. +) +item(var(in-string command) ...)( +Bind each var(in-string) to each var(command). +When tt(-R) is used, interpret the var(in-string)s as ranges. +) +item([ var(in-string) ])( +List key bindings. If an var(in-string) is specified, the binding of +that string in the selected keymap is displayed. Otherwise, all key +bindings in the selected keymap are displayed. (As a special case, +if the tt(-e) or tt(-v) option is used alone, the keymap is em(not) +displayed - the implicit linking of keymaps is the only thing that +happens.) + +When the tt(-L) option is used, the list is in the form of tt(bindkey) +commands to create the key bindings. +) +enditem() + +When the tt(-R) option is used as noted above, a valid range consists of +two characters, with an optional `tt(-)' between them. All characters +between the two specified, inclusive, are bound as specified. + +For either var(in-string) or var(out-string), the following +escape sequences are recognised: + +startsitem() +sitem(tt(\a))(bell character) +sitem(tt(\b))(backspace) +sitem(tt(\e), tt(\E))(escape) +sitem(tt(\f))(form feed) +sitem(tt(\n))(linefeed (newline)) +sitem(tt(\r))(carriage return) +sitem(tt(\t))(horizontal tab) +sitem(tt(\v))(vertical tab) +sitem(tt(\)var(NNN))(character code in octal) +sitem(tt(\x)var(NN))(character code in hexadecimal) +sitem(tt(\M)[tt(-)]var(X))(character with meta bit set) +sitem(tt(\C)[tt(-)]var(X))(control character) +sitem(tt(^)var(X))(control character) +endsitem() + +In all other cases, `tt(\)' escapes the following character. Delete is +written as `tt(^?)'. Note that `tt(\M^?)' and `tt(^\M?)' are not the same, +and that (unlike emacs), the bindings `tt(\M-)var(X)' and `tt(\e)var(X)' +are entirely distinct, although they are initialized to the same bindings +by `tt(bindkey -m)'. +) +findex(vared) +cindex(parameters, editing) +cindex(editing parameters) +item(tt(vared) [ tt(-Aache) ] [ tt(-p) var(prompt) ] [ tt(-r) var(rprompt) ] var(name))( +The value of the parameter var(name) is loaded into the edit +buffer, and the line editor is invoked. When the editor exits, +var(name) is set to the string value returned by the editor. +When the tt(-c) flag is given, the parameter is created if it doesn't +already exist. The tt(-a) flag may be given with tt(-c) to create +an array parameter, or the tt(-A) flag to create an associative array. +If the type of an existing parameter does not match the type to be +created, the parameter is unset and recreated. + +If an array or array slice is being edited, separator characters as defined +in tt($IFS) will be shown quoted with a backslash, as will backslashes +themselves. Conversely, when the edited text is split into an array, a +backslash quotes an immediately following separator character or backslash; +no other special handling of backslashes, or any handling of quotes, is +performed. + +Individual elements of existing array or associative array parameters +may be edited by using subscript syntax on var(name). New elements are +created automatically, even without tt(-c). + +If the tt(-p) flag is given, the following string will be taken as +the prompt to display at the left. If the tt(-r) flag is given, +the following string gives the prompt to display at the right. If the +tt(-h) flag is specified, the history can be accessed from ZLE. If the +tt(-e) flag is given, typing tt(^D) (Control-D) on an empty line +causes tt(vared) to exit immediately with a non-zero return value. +) +findex(zle) +cindex(widgets, rebinding) +cindex(rebinding widgets) +cindex(widgets, binding) +cindex(binding widgets) +cindex(widgets, invoking) +cindex(invoking widgets) +cindex(widgets, calling) +cindex(calling widgets) +cindex(widgets, defining) +cindex(defining widgets) +xitem(tt(zle) tt(-l) [ tt(-L) | tt(-a) ] [ var(string) ... ]) +xitem(tt(zle) tt(-D) var(widget) ...) +xitem(tt(zle) tt(-A) var(old-widget) var(new-widget)) +xitem(tt(zle) tt(-N) var(widget) [ var(function) ]) +xitem(tt(zle) tt(-C) var(widget) var(completion-widget) var(function)) +xitem(tt(zle) tt(-R) [ tt(-c) ] [ var(display-string) ] [ var(string) ... ]) +xitem(tt(zle) tt(-M) var(string)) +xitem(tt(zle) tt(-U) var(string)) +xitem(tt(zle) tt(-I)) +xitem(tt(zle) var(widget) tt([ -n) var(num) tt(]) tt([ -N ]) var(args) ...) +item(tt(zle))( +The tt(zle) builtin performs a number of different actions concerning +ZLE. Which operation it performs depends on its options: + +startitem() +item(tt(-l) [ tt(-L) | tt(-a) ])( +List all existing user-defined widgets. If the tt(-L) +option is used, list in the form of tt(zle) +commands to create the widgets. + +When combined with the tt(-a) option, all widget names are listed, +including the builtin ones. In this case the tt(-L) option is ignored. + +If at least one var(string) is given, nothing will be printed but the +return status will be zero if all var(string)s are names of existing +widgets (or of user-defined widgets if the tt(-a) flag is not given) +and non-zero if at least one var(string) is not a name of an defined +widget. +) +item(tt(-D) var(widget) ...)( +Delete the named var(widget)s. +) +item(tt(-A) var(old-widget) var(new-widget))( +Make the var(new-widget) name an alias for var(old-widget), so that +both names refer to the same widget. The names have equal standing; +if either is deleted, the other remains. If there is already a widget +with the var(new-widget) name, it is deleted. +) +item(tt(-N) var(widget) [ var(function) ])( +Create a user-defined widget. If there is already a widget with the +specified name, it is overwritten. When the new +widget is invoked from within the editor, the specified shell var(function) +is called. If no function name is specified, it defaults to +the same name as the widget. For further information, see the section +em(Widgets) in +ifzman(zmanref(zshzle))\ +ifnzman(noderef(Zsh Line Editor))\ +. +) +cindex(completion widgets, creating) +item(tt(-C) var(widget) var(completion-widget) var(function))( +Create a user-defined completion widget named var(widget). The +completion widget will behave like the built-in completion-widget +whose name is given as var(completion-widget). To generate the +completions, the shell function var(function) will be called. +For further information, see +ifzman(zmanref(zshcompwid))\ +ifnzman(noderef(Completion Widgets))\ +. +) +item(tt(-R) [ tt(-c) ] [ var(display-string) ] [ var(string) ... ])( +Redisplay the command line; this is to be called from within a user-defined +widget to allow changes to become visible. If a var(display-string) is +given and not empty, this is shown in the status line (immediately +below the line being edited). + +If the optional var(string)s are given they are listed below the +prompt in the same way as completion lists are printed. If no +var(string)s are given but the tt(-c) option is used such a list is +cleared. + +Note that this option is only useful for widgets that do not exit +immediately after using it because the strings displayed will be erased +immediately after return from the widget. + +This command can safely be called outside user defined widgets; if zle is +active, the display will be refreshed, while if zle is not active, the +command has no effect. In this case there will usually be no other +arguments. The status is zero if zle was active, else one. +) +item(tt(-M) var(string))( +As with the tt(-R) option, the var(string) will be displayed below the +command line; unlike the tt(-R) option, the string will not be put into +the status line but will instead be printed normally below the +prompt. This means that the var(string) will still be displayed after +the widget returns (until it is overwritten by subsequent commands). +) +item(tt(-U) var(string))( +This pushes the characters in the var(string) onto the input stack of +ZLE. After the widget currently executed finishes ZLE will behave as +if the characters in the var(string) were typed by the user. + +As ZLE uses a stack, if this option is used repeatedly +the last string pushed onto the stack will be processed first. However, +the characters in each var(string) will be processed in the order in which +they appear in the string. +) +item(tt(-I))( +Unusually, this option is only useful em(outside) ordinary widget functions. +It invalidates the current zle display in preparation for output; usually +this will be from a trap function. It has no effect if zle is not +active. When a trap exits, the shell checks to see if the display needs +restoring, hence the following will print output in such a way as not to +disturb the line being edited: + +example(TRAPUSR1() { + # Invalidate zle display + zle -I + # Show output + print Hello +}) + +Note that there are better ways of manipulating the display from within zle +widgets. In general, the trap function may need to test whether zle is +loaded before using this method; if it is not, there is no point in loading +it specially since the line editor will not be active. + +The status is zero if zle was active, else one. +) +item(var(widget) tt([ -n) var(num) tt(]) tt([ -N ]) var(args) ...)( +Invoke the specified widget. This can only be done when ZLE is +active; normally this will be within a user-defined widget. + +With the options tt(-n) and tt(-N), the current numerical argument will be +saved and then restored after the call to tt(widget); `tt(-n) var(num)' +sets the numerical argument temporarily to var(num), while `tt(-N)' sets it +to the default, i.e. as if there were none. + +Any further arguments will be passed to the widget. If it is a shell +function, these are passed down as positional parameters; for builtin +widgets it is up to the widget in question what it does with them. +Currently arguments are only handled by the incremental-search commands, +the tt(history-search-forward) and tt(-backward) and the corresponding +functions prefixed by tt(vi-), and by tt(universal-argument). No error is +flagged if the command does not use the arguments, or only uses some of +them. + +The return status reflects the success or failure of the operation carried +out by the widget, or if it is a user-defined widget the return status of +the shell function. + +A non-zero return status causes the shell to beep when the widget exits, +unless the tt(BEEP) options was unset or the widget was called via the +tt(zle) command. Thus if a user defined widget requires an immediate beep, +it should call the tt(beep) widget directly. +) +enditem() + +With no options and no arguments, only the return status will be +set. It is zero if ZLE is currently active and widgets could be +invoked using this builtin command and non-zero if ZLE is not active. +) +enditem() + sect(Widgets) cindex(widgets) All actions in the editor are performed by `widgets'. A widget's job is |