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GNU Info File | 1995-09-01 | 33.1 KB | 787 lines

This is Info file ../info/hyperbole.info, produced by Makeinfo-1.63 from the input file hyperbole.texi. File: hyperbole.info, Node: Embedding Hyperbole, Prev: Encapsulating Systems, Up: Developing with Hyperbole Embedding Hyperbole =================== [NOTE: We have never done this ourselves, though we have done similar things which leads us to infer that the task should not be difficult.] The standard Emacs-based Hyperbole user interface has purposely been separated from the Hyperbole backend to support the development of alternative interfaces and the embedding of Hyperbole functionality within other system prototypes. The Hyperbole backend functionality that system developers can make use of is called its Application Programming Interface (API). The API may be used to make server-based calls to Hyperbole when Emacs is run as a non-interactive (batch) process, with its input/output streams attached to another process. The public functions and variables from the following files may be considered the present Hyperbole API: `hact.el', `hargs.el', `hbmap.el', `hbut.el', `hhist.el', `hmail.el', `hmoccur.el', `hpath.el', `htz.el', `hypb.el', `set.el', `wconfig.el', `wrolo.el', and `wrolo-logic.el'. (Note that within a class definition, functions and variables that follow a line of dashes are private.) File: hyperbole.info, Node: Glossary, Next: Smart Key Reference, Prev: Developing with Hyperbole, Up: Top Glossary ******** Concepts pertinent to operational usage of Hyperbole are defined here. If some GNU Emacs terms are unfamiliar to you, see *Note Emacs Glossary: (emacs)Glossary. `action' An executable behavior associated with a Hyperbole button. A specific class of actions which display entities are called *links*, such as a link to a file. `Action Key' See *Smart Key*. `action type' A behavioral specification for use within Hyperbole buttons. Action types usually contain a set of parameters which must be given values for each button with which they are associated. An action type together with a set of values, called arguments, may be considered an *action*. *Actype* is a synonym for action type. `activation' Request for a Hyperbole button to perform its action. Ordinarily the user presses a key which selects and activates a button. `ange-ftp' A standard GNU Emacs Lisp package which allows one to use pathnames that are accessible via the Internet File Transfer Protocol (ftp) just like other pathnames, for example when finding a file. The latest version of ange-ftp may always be obtained via anonymous ftp to: `/ftp.gnu.ai.mit.edu:ange-ftp/ange-ftp.tar.gz'. `argument' A button-specific value fed to a Hyperbole type specification when the button is activated. `Assist Key' See *Smart Key*. `attributes' Slot names associated with Hyperbole buttons. An *attribute value* is associated with each button attribute. `button' A selectable Hyperbole construct which performs an action. A button consists of a set of attributes that includes: a textual label, a category, a type and zero or more arguments. *Explicit buttons* also have creator, create time, last modifier, and last modifier time attributes. Buttons provide the user's gateway to information. The user sees and interacts with button labels, the rest of the button data is managed invisibly by Hyperbole and displayed only in response to user queries. `button activation' See *activation*. `button attributes' See *attributes*. `button data' Lists of button attribute values explicitly saved and managed by Hyperbole. One list for each button created by Hyperbole. `button file, local' A per-directory file named `HYPB' that may be used to store any desired buttons and may then be displayed via a menu selection whenever a user is within that directory. `button file, personal' A per-user file named `HYPB' that may be used to store any desired buttons and may then be displayed via a menu selection. `button key' A normalized form of a *button label* used internally by Hyperbole. `button label' A text string that visually indicates a Hyperbole button location and provides it with a name and unique identifier. Within a buffer, buttons with the same label are considered separate views of the same button and so behave exactly alike. Since button labels are simply text strings, they may be embedded within any text to provide non-linear information or operational access points. The maximum length of a button label is limited by the variable EBUT:MAX-LEN. `button selection' The act of designating a Hyperbole button upon which to operate. Use the Action Key to select a button. `category' A high-level, conceptual grouping of Hyperbole buttons into classes. *Implicit* and *explicit* groupings represent categories. `class' A group of functions and variables with the same prefix in their names, used to provide an interface to an internal or external Hyperbole abstraction. `context' A programmatic or positional state recognized by Hyperbole. We speak of Smart Key and implicit button contexts. Both are typically defined in terms of surrounding patterns within a buffer, but may be defined by arbitrary Emacs Lisp predicates. (Context may come to have a broader meaning within future versions of Hyperbole.) `environment' See *Hyperbole environment*. `efs' The much larger successor to ange-ftp. It does the same thing as ange-ftp but works with more types of ftp hosts. See *ange-ftp*. `explicit button' A button created and managed by Hyperbole. By default, explicit buttons are delimited like this `<(fake button)>'. Direct selection is used to operate upon an explicit button. `global button' A form of explicit button which is typically accessed by name rather than direct selection. Global buttons are useful when one wants quick access to actions such as jumping to common file locations or for performing sequences of operations. One need not locate them since they are always available by name, with full completion offered. All global buttons are stored in the file given by the variable GBUT:FILE and may be activated as regular explicit buttons by visiting this file. By default, this is the same as the user's personal button file. `global button file' See *button file, personal*. `hook variable' A variable that permits customization of an existing function's operation without the need to edit the function's code. See also the documentation for the function `(run-hooks)'. `Hyperbole' A flexible, programmable information management and viewing system built on top of GNU Emacs. It utilizes a button-action model and supports hypertextual linkages. Hyperbole is all things to all people. `Hyperbole environment' A programmatic context within which Hyperbole operates. This includes the set of Hyperbole types defined and the set of Hyperbole code modules loaded. It does not include the set of accessible buttons. Although the entire Emacs environment is available to Hyperbole, we do not speak of this as part of the Hyperbole environment. `hypertext' A text or group of texts which may be explored in a non-linear fashion through associative linkages embedded throughout the text. Instead of simply referring to other pieces of work, hypertext references when followed actually take you to the works themselves. `implicit button' A button recognized contextually by Hyperbole. Such buttons contain no button data. See also *implicit button type*. `implicit button type' A specification of how to recognize and activate implicit buttons of a specific kind. Implicit button types often utilize structure internal to documents created and managed without Hyperbole assistance, for example, programming documentation. *Ibtype* is a synonym for implicit button type. See also *system encapsulation*. `instance number' A colon prefaced number appended to the label of a newly created button when the button's label duplicates the label of an existing button in the current buffer. This number makes the label unique and so allows any number of buttons with the same base label within a single buffer. `link' A reference from a Hyperbole button to an entity. The referenced entity is sometimes called a *node* or *referent*. A specific class of actions which display entities are called *links*, such as a link to a file. `local button file' See *button file, local*. `mouse button' `mouse key' See *Smart Key*. `node' See *link*. `predicate' A boolean (nil = false, non-nil = true) Lisp expression typically evaluated as part of a conditional expression. `referent' See *link*. `Smart Key' A context-sensitive key used within Hyperbole and beyond. Actually, there are two Smart Keys, the Action Key and the Assist Key. The Action Key, typically bound to the shift-middle mouse key (or shift-left mouse key on a 2-button mouse), activates Hyperbole buttons and scrolls the buffer forward a windowful when pressed at the end of a line. The Assist Key, typically bound to the shift-right mouse key, explains what a Hyperbole button does or scrolls the buffer backward a windowful when pressed at the end of a line. To see what a Smart Key will do within a particular context, depress and hold the key at the point desired and depress the other Smart Key. A buffer containing a description of its contextual function will then be displayed. You may release the two keys in any order after you have them both depressed. A press of the Assist Key in an unsupported context displays a summary of Smart Key functions in each context, as does the Doc/SmartKy menu item. `source buffer / file' The buffer or file within which a Hyperbole button is embedded. `system encapsulation' Use of Hyperbole to provide an improved or simply consistent user interface to another system. Typically, implicit button types are defined to recognize and activate button-type constructs managed by the other system. `view' A perspective on some information. A view can affect the extent of the information displayed, its format, modes used to operate on it, its display location and so forth. `view spec' A terse (and to the uninitiated, cryptic) string that specifies a particular view of a link referent or some other information. File: hyperbole.info, Node: Smart Key Reference, Next: Outliner Keys, Prev: Glossary, Up: Top Smart Key Reference ******************* This appendix supplies complete documentation on Smart Key operation. It is quite extensive and is meant for reference rather than sequential reading. *Note Smart Keys::, for a description of the Smart Keys. That section also describes how to get context-sensitive Smart Key help, with which you can explore Smart Key operation bit by bit. Smart Key operations are context-sensitive. Contexts are described herein as conditionals, e.g. when depressed here, if this is true, etc. Each Smart Key context is listed in the order in which it will be checked. The first matching context is always the one applied. Within each context, the actions performed by the Action and Assist Keys are listed. * Menu: * Smart Mouse Keys:: * Smart Keyboard Keys:: File: hyperbole.info, Node: Smart Mouse Keys, Next: Smart Keyboard Keys, Prev: Smart Key Reference, Up: Smart Key Reference Smart Mouse Keys ================ Smart Key drags and modeline presses can only be used when running under a window system with mouse key support. So keep in mind that the operations in this section apply only if you have mouse support within Hyperbole. The Smart Key operations in, *Note Smart Keyboard Keys::, apply to both mouse and keyboard Smart Key usage. If dragged from a side-by-side window edge or from the immediate left of a vertical scroll bar: ACTION or ASSIST Resizes adjacent window sides to the point of drag release. If dragged from inside one window to another: ACTION Creates a new link button at the drag start location, linked to the drag end location. If drag start position is within a button, modifies the button to link to drag end location. ASSIST Swaps buffers in the two windows. If dragged horizontally within a single window while depressed (hmouse-x-drag-sensitivity sets the minimal horizontal movement which registers a drag): ACTION Goes to buffer end if drag was to the right, otherwise goes to beginning. ASSIST Splits window vertically if drag was to the right, otherwise deletes window. If depressed within a window mode line: ACTION (1) clicked on left edge of a window's modeline, window's buffer is buried (placed at bottom of buffer list); (2) clicked on right edge of a window's modeline, the Info buffer is displayed, or if already displayed and the modeline clicked belongs to a window displaying Info, the Info buffer is hidden; (3) clicked anywhere in the middle of a window's modeline, the functions listed in 'assist-key-modeline-hook' are called; (4) dragged vertically from modeline to within a window, the modeline is moved to point of key release, thereby resizing its window and potentially its vertical neighbors. ASSIST (1) clicked on left edge of a window's modeline, bottom buffer in buffer list is unburied and placed in window; (2) clicked on right edge of a window's modeline, the summary of Smart Key behavior is displayed, or if already displayed and the modeline clicked belongs to a window displaying the summary, the summary buffer is hidden; (3) clicked anywhere in the middle of a window's modeline, a popup menu (if available) is displayed; (4) dragged vertically from modeline to within a window, the modeline is moved to point of key release, thereby resizing its window and potentially its vertical neighbors. If dragged vertically within a single window while depressed (hmouse-y-drag-sensitivity sets the minimal vertical movement which registers a drag): ACTION or ASSIST Splits current window into two side-by-side windows. If dragged diagonally within a single window while depressed (hmouse-x-diagonal-sensitivity and hmouse-y-diagonal-sensitivity set the minimal diagonal movement which registers a drag): ACTION Save current window configuration onto a ring of window configurations. ASSIST Restores prior window configuration from ring. A prefix argument N specifies the Nth prior configuration from the ring. File: hyperbole.info, Node: Smart Keyboard Keys, Prev: Smart Mouse Keys, Up: Smart Key Reference Smart Keyboard Keys =================== When prompting for a Hyperbole argument, a press in the minibuffer: ACTION Terminates this minibuffer argument. ASSIST Offers completion help for current minibuffer argument. When reading a Hyperbole menu item or a Hyperbole completion-based argument: ACTION Returns value selected at point if any, else nil. If value is the same as the contents of the minibuffer, it is used as the current minibuffer argument, otherwise, the minibuffer is erased and value is inserted there. ASSIST Displays Hyperbole menu item help when item is selected. When pressed at the end of a line but not the end of a buffer: ACTION Scrolls up according to value of smart-scroll-proportional. If smart-scroll-proportional is nil (the default) or if point is on the top window line, scrolls up (forward) a windowful. Otherwise, tries to bring current line to top of window. Leaves point at end of line and returns t if scrolled, nil if not. ASSIST Scrolls down according to value of smart-scroll-proportional. If smart-scroll-proportional is nil (the default) or if point is on the bottom window line, scrolls down (backward) a windowful. Otherwise, tries to bring current line to bottom of window. Leaves point at end of line and returns t if scrolled, nil if not. When pressed on a Hyperbole button: ACTION Activates button. ASSIST Displays help for button, typically a summary of its attributes. If pressed within a buffer in View major or minor mode: ACTION Scrolls buffer forward a windowful and quits from view mode when at the last line of the buffer. ASSIST Scrolls buffer backward a windowful. When pressed within a Hyperbole outliner buffer (kotl-mode): ACTION (1) at the end of buffer, uncollapse and unhide all cells in view; (2) within a cell, if its subtree is hidden then show it, otherwise hide it; (3) between cells or within the read-only indentation region to the left of a cell, then move point to prior location and begin creation of a klink to some other outline cell; hit the Action Key twice to select the link referent cell; (4) anywhere else, scroll up a windowful. ASSIST (1) at the end of buffer, collapse all cells and hide all non-level-one cells; (2) on a header line but not at the beginning or end, display properties of each cell in kotl beginning at point; (3) between cells or within the read-only indentation region to the left of a cell, then move point to prior location and prompt to move one tree to a new location in the outline; hit the Action Key twice to select the tree to move and where to move it; (4) anywhere else, scroll down a windowful. When pressed on a Smart Menu item: ACTION Activates item. ASSIST Displays help for item. When pressed at the end of a Help buffer: ACTION or ASSIST Restores window configuration prior to help display. When pressed within an OO-Browser listing window: ACTION (1) in a blank buffer or at the end of a buffer, browser help information is displayed in the viewer window; (2) at the beginning of a (non-single char) class name, the class' ancestors are listed; (3) at the end of an entry line, scrolls listing up; (4) on the '...', following a class name, point is moved to the class descendency expansion; (5) before an element name, the implementor classes of the name are listed; (6) anywhere else on an entry line, the source is displayed for editing. ASSIST (1) in a blank buffer, a selection list of buffer files is displayed; (2) at the beginning of a (non-single char) entry, the class' descendants are listed; (3) at the end of an entry line, scrolls listing down; (4) on the '...', following a class name, point is moved to the class expansion; (5) anywhere else on a class entry line, lists the class' elements; (6) anywhere else on an element line, lists the element's implementor classes; (7) on a blank line following all entries, the current listing buffer is exited. When pressed within an OO-Browser Command Help Menu buffer: ACTION Executes an OO-Browser command whose key binding is at point. ASSIST Displays help for an OO-Browser command whose key binding is at point. When pressed on an identifier within an OO-Browser source file: ACTION Tries to display identifier definition. ASSIST Not applicable. When pressed within a C source code file: ACTION Jumps to the definition of selected C construct: (1) on a '#include' statement, the include file is displayed; Look for include file in directory lists 'smart-c-cpp-include-dirs' and 'smart-c-include-dirs'. (2) on a C identifier, the identifier definition is displayed, assuming the identifier is found within an 'etags' generated tag file in the current directory or any of its ancestor directories. (3) if 'smart-c-use-lib-man' is non-nil, the C identifier is recognized as a library symbol, and a man page is found for the identifier, then the man page is displayed. ASSIST Jumps to the next tag matching an identifier at point. When pressed within an assembly source code file: ACTION Jumps to the definition of selected assembly construct: (1) on an include statement, the include file is displayed; Look for include file in directory list 'smart-asm-include-dirs'. (2) on an identifier, the identifier definition is displayed, assuming the identifier is found within an 'etags' generated tag file in the current directory or any of its ancestor directories. ASSIST Jumps to the next tag matching an identifier at point. When pressed within a C++ source code file: ACTION Jumps to the definition of selected C+ construct: (1) on a '#include' statement, the include file is displayed; Look for include file in directory lists 'smart-c-cpp-include-dirs' and 'smart-c-include-dirs'. (2) on a C++ identifier, the identifier definition is displayed, assuming the identifier is found within an 'etags' generated tag file in the current directory or any of its ancestor directories. (3) if 'smart-c-use-lib-man' is non-nil, the C++ identifier is recognized as a library symbol, and a man page is found for the identifier, then the man page is displayed. ASSIST Jumps to the next tag matching an identifier at point. When pressed within a Objective-C source code file: ACTION Jumps to the definition of selected C+ construct: (1) on a '#include' statement, the include file is displayed; Look for include file in directory lists 'smart-c-cpp-include-dirs' and 'smart-c-include-dirs'. (2) on an Objective-C identifier, the identifier definition is displayed, assuming the identifier is found within an 'etags' generated tag file in the current directory or any of its ancestor directories. (3) if 'smart-c-use-lib-man' is non-nil, the Objective-C identifier is recognized as a library symbol, and a man page is found for the identifier, then the man page is displayed. ASSIST Jumps to the next tag matching an identifier at point. When pressed on a Lisp symbol within a Lisp code buffer: ACTION Jumps to the definition of any selected Lisp construct. If on an Emacs Lisp require, load, or autoload clause and 'find-library' from load-library package by Hallvard Furuseth <hallvard@ifi.uio.no> has been loaded, jumps to library source, if possible. ASSIST Jumps to the next tag matching an identifier at point or if using the "wtags" package and identifier is an Emacs Lisp symbol, then displays documentation for the symbol. When the OO-Browser has been loaded and the press is within a C++ buffer: ACTION or ASSIST Jumps to the definition of selected C++ construct via OO-Browser support. (1) on a '#include' statement, the include file is displayed; Look for include file in directory lists 'smart-c-cpp-include-dirs' and 'smart-c-include-dirs'. (2) within a method declaration, its definition is displayed; (3) on a class name, the class definition is shown. When the OO-Browser has been loaded and the press is within a Objective-C buffer: ACTION or ASSIST Jumps to the definition of selected Objective-C construct via OO-Browser support. (1) on a '#include' statement, the include file is displayed; Look for include file in directory lists 'smart-c-cpp-include-dirs' and 'smart-c-include-dirs'. (2) within a method declaration, its definition is displayed; (3) on a class name, the class definition is shown. When pressed within an occur-mode or moccur-mode buffer: ACTION or ASSIST Jumps to the source buffer and line of the current occurrence. When pressed within a calendar-mode buffer: ACTION (1) at the end of the buffer, the calendar is scrolled forward 3 months; (2) to the left of any dates on a calendar line, the calendar is scrolled backward 3 months; (3) on a date, the diary entries for the date, if any, are displayed. ASSIST (1) at the end of the buffer, the calendar is scrolled backward 3 months; (2) to the left of any dates on a calendar line, the calendar is scrolled forward 3 months; (3) anywhere else, all dates with marking diary entries are marked in the calendar window. When pressed within a man page apropos buffer: ACTION (1) on a UNIX man apropos entry, the man page for that entry is displayed in another window; (2) on or after the last line, the buffer in the other window is scrolled up a windowful. ASSIST (1) on a UNIX man apropos entry, the man page for that entry is displayed in another window; (2) on or after the last line, the buffer in the other window is scrolled down a windowful. If Smart Menu package has been loaded and 'hkey-always-display-menu' is non-nil: ACTION or ASSIST Pops up a window with a Smart Menu of commands. Menu displayed is selected by (smart-menu-choose-menu). If pressed within an outline-mode buffer or when 'selective-display' is non-nil: ACTION Collapses, expands, and moves outline entries. (1) after an outline heading has been cut via the Action Key, then paste the cut heading at point; (2) at the end of buffer, show all buffer text (3) at the beginning of a heading line, cut the headings subtree from the buffer; (4) on a header line but not at the beginning or end, if headings subtree is hidden then show it, otherwise hide it; (5) anywhere else, scroll up a windowful. ASSIST (1) after an outline heading has been cut via the Action Key, allow multiple pastes throughout the buffer (last paste should be done with the Action Key, not the Assist Key); (2) at the end of buffer, hide all bodies in buffer; (3) at the beginning of a heading line, cut the current heading (sans subtree) from the buffer; (4) on a header line but not at the beginning or end, if heading body is hidden then show it, otherwise hide it; (5) anywhere else, scroll down a windowful. If pressed within an Info manual node: ACTION (1) the first line of an Info Menu Entry or Cross Reference, the desired node is found; (2) the Up,Next,or Previous entries of a Node Header (first line), the desired node is found; (3) the File entry of a Node Header (first line), the 'Top' node within that file is found; (4) at the end of the current node, the Next node is found (this will descend subtrees if the function 'Info-global-next' is bound); (5) anywhere else (e.g. at the end of a line), the current node entry is scrolled up a windowful. ASSIST (1) the first line of an Info Menu Entry or Cross Reference, the desired node is found; (2) the Up,Next,or Previous entries of a Node Header (first line), the last node in the history list is found; (3) the File entry of a Node Header (first line), the 'DIR' root-level node is found; (4) at the end of the current node, the Previous node is found (this will return from subtrees if the function 'Info-global-prev is bound); (5) anywhere else (e.g. at the end of a line), the current node entry is scrolled down a windowful. If pressed within a Hyperbole-supported mail reader, 'hmail:reader', or mail summary mode, 'hmail:lister', buffer at: ACTION (1) a msg buffer, within the first line or at the end of a message, the next undeleted message is displayed; (2) a msg buffer within the first line of an Info cross reference, the reference is followed; (3) anywhere else in a msg buffer, the window is scrolled up one windowful; (4) a msg summary buffer on a header entry, the message corresponding to the header is displayed in the msg window; (5) a msg summary buffer, on or after the last line, the messages marked for deletion are expunged. ASSIST (1) a msg buffer, within the first line or at the end of a message, the previous undeleted message is displayed; (2) a msg buffer within the first line of an Info cross reference, the reference is followed; (3) anywhere else in a msg buffer, the window is scrolled down one windowful; (4) a msg summary buffer on a header entry, the message corresponding to the header is marked as deleted; (5) a msg summary buffer, on or after the last line, all messages are marked undeleted. If pressed within a GNUS listing of newsgroups buffer at: ACTION (1) a GNUS-GROUP line, that newsgroup is read; (2) to the left of any GNUS-GROUP line, on any of the whitespace, the current group is unsubscribed or resubscribed; (3) at the end of the GNUS-GROUP buffer, after all lines, checks for new news. ASSIST (1) a GNUS-GROUP line, that newsgroup is read; (2) to the left of any GNUS-GROUP line, on any of the whitespace, the user is prompted for a group name to subscribe or unsubscribe to; (3) at the end of the GNUS-GROUP buffer, after all lines, quits from the newsreader. If pressed within a GNUS newsreader subject listing buffer at: ACTION (1) a GNUS-SUBJECT line, that article is read, marked deleted, and scrolled forward; (2) at the end of the GNUS-SUBJECT buffer, the next undeleted article is read or the next group is entered. ASSIST (1) a GNUS-SUBJECT line, that article is read and scrolled backward; (2) at the end of the GNUS-SUBJECT buffer, the subject is exited, the user is returned to group mode. If pressed within a GNUS newsreader article buffer at: ACTION (1) the first line or end of an article, the next unread message is displayed; (2) the first line of an Info cross reference, the reference is followed; (3) anywhere else, the window is scrolled up a windowful. ASSIST (1) the first line or end of an article, the previous message is displayed; (2) the first line of an Info cross reference, the reference is followed; (3) anywhere else, the window is scrolled down a windowful. If pressed within a listing of buffers (Buffer-menu-mode): ACTION (1) on the first column of an entry, the selected buffer is marked for display; (2) on the second column of an entry, the selected buffer is marked to be saved; (3) anywhere else within an entry line, all saves and deletes are done, and selected buffers are displayed, including the one just clicked on (if in the OO-Browser, only the selected buffer is displayed); (4) on or after the last line in the buffer, all saves and deletes are done. ASSIST (1) on the first or second column of an entry, the selected buffer is unmarked for display and for saving or deletion; (2) anywhere else within an entry line, the selected buffer is marked for deletion; (3) on or after the last line in the buffer, all display, save, and delete marks on all entries are undone. If pressed within a dired-mode buffer: ACTION (1) within an entry line, the selected file/directory is displayed for editing in the other window; (2) on or after the last line in the buffer, if any deletes are to be performed, they are executed after user verification, otherwise, this dired invocation is quit. ASSIST (1) on a '~' character, all backup files in the directory are marked for deletion; (2) on a '#' character, all auto-save files in the directory are marked for deletion; (3) anywhere else within an entry line, the current entry is marked for deletion; (4) on or after the last line in the buffer, all delete marks on all entries are undone. If pressed within a tar-mode buffer: ACTION (1) within an entry line, the selected file/directory is displayed for editing in the other window; (2) on or after the last line in the buffer, if any deletes are to be performed, they are executed after user verification, otherwise, this tar file browser is quit. ASSIST (1) on an entry line, the current entry is marked for deletion; (2) on or after the last line in the buffer, all delete marks on all entries are undone. If pressed on a cross reference within a man page entry section labeled NAME, SEE ALSO, or PACKAGES USED, or within a man page C routine specification (see 'smart-man-c-routine-ref') and man page buffer has either an attached file or else a MAN-PATH local variable containing its pathname: ACTION or ASSIST Displays man page or source code for cross reference. If pressed within an entry in the wrolo match display buffer: ACTION or ASSIST The entry is edited in the other window.