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author | K. Richard Pixley <rich@cygnus> | 1991-11-13 21:01:55 +0000 |
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committer | K. Richard Pixley <rich@cygnus> | 1991-11-13 21:01:55 +0000 |
commit | 681fa9a853842192e71ead32593bdbff36d85b73 (patch) | |
tree | 8cd54851330d6c2eaf39c7421de5a778046056e4 /readline/inc-read.texi | |
parent | 7785cbdd0b5afbbcc672b6f8c2d154e0823319d4 (diff) | |
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diff --git a/readline/inc-read.texi b/readline/inc-read.texi new file mode 100755 index 0000000..52a0e33 --- /dev/null +++ b/readline/inc-read.texi @@ -0,0 +1,494 @@ +@ignore + +This file documents the end user interface to the GNU command line +editing feautres. It is to be an appendix to manuals for programs which +use these features. There is a document entitled "readline.texinfo" +which contains both end-user and programmer documentation for the GNU +Readline Library. + +Copyright (C) 1988, 1991 Free Software Foundation, Inc. + +Written by Brian Fox. + +Permission is granted to process this file through Tex and print the +results, provided the printed document carries copying permission notice +identical to this one except for the removal of this paragraph (this +paragraph not being relevant to the printed manual). + +Permission is granted to make and distribute verbatim copies of this manual +provided the copyright notice and this permission notice are preserved on +all copies. + +Permission is granted to copy and distribute modified versions of this +manual under the conditions for verbatim copying, provided also that the +GNU Copyright statement is available to the distributee, and provided that +the entire resulting derived work is distributed under the terms of a +permission notice identical to this one. + +Permission is granted to copy and distribute translations of this manual +into another language, under the above conditions for modified versions. +@end ignore + +@node Command Line Editing, , , Top +@appendix Command Line Editing + +This appendix describes GNU's command line editing interface. +Often during an interactive session you will type in a long line of +text, only to notice that the first word on the line is misspelled. The +Readline library gives you a set of commands for manipulating the text +as you type it in, allowing you to just fix your typo, and not forcing +you to retype the majority of the line. Using these editing commands, +you move the cursor to the place that needs correction, and delete or +insert the text of the corrections. Then, when you are satisfied with +the line, you simply press @key{RETURN}. You do not have to be at the +end of the line to press @key{RETURN}; the entire line will be accepted +in any case. + +@menu +* Conventions:: Notation used in this appendix. +* Basic Line Editing:: The minimum set of commands for editing a line. +* Movement Commands:: Commands for moving the cursor about the line. +* Cutting and Pasting:: Deletion and copying of text sections. +* Transposition:: Exchanging two characters or words. +* Completion:: Expansion of a partially typed word into + the full text. +@end menu + +@node Conventions, Basic Line Editing, Command Line Editing, Command Line Editing +@appendixsec Conventions on Notation + +In this Appendix, the following notation is used to describe +keystrokes. + +The text @kbd{C-k} is read as `Control-K' and describes the character +produced when the Control key is depressed and the @key{k} key is struck. + +The text @kbd{M-k} is read as `Meta-K' and describes the character +produced when the meta key (if you have one) is depressed, and the +@key{k} key is struck. If you do not have a meta key, it is equivalent +to type @key{ESC} @i{first}, and then type @key{k}. Either process is +known as @dfn{metafying} the @key{k} key. + +The text @kbd{M-C-k} is read as `Meta-Control-k' and describes the +character produced by @dfn{metafying} @kbd{C-k}. + +In addition, several keys have their own names. Specifically, +@key{DEL}, @key{ESC}, @key{LFD}, @key{SPC}, @key{RET}, and @key{TAB} all +stand for themselves when seen in this text, or in an init file +(@pxref{Readline Init File}, for more info). + +@node Readline Interaction, Readline Init File, Readline Introduction, Readline Top +@appendixsec Readline Interaction +@cindex interaction, readline + +@menu +* Readline Bare Essentials:: The least you need to know about Readline. +* Readline Movement Commands:: Moving about the input line. +* Readline Killing Commands:: How to delete text, and how to get it back! +* Readline Arguments:: Giving numeric arguments to commands. +@end menu + +@node Readline Bare Essentials, Readline Movement Commands, Readline Interaction, Readline Interaction +@appendixsubsec Bare Essentials + +In order to enter characters into the line, simply type them. The typed +character appears where the cursor was, and then the cursor moves one +space to the right. If you mistype a character, you can use @key{DEL} to +back up, and delete the mistyped character. + +Sometimes you may miss typing a character that you wanted to type, and +not notice your error until you have typed several other characters. In +that case, you can type @kbd{C-b} to move the cursor to the left, and then +correct your mistake. Aftwerwards, you can move the cursor to the right +with @kbd{C-f}. + +When you add text in the middle of a line, you will notice that characters +to the right of the cursor get `pushed over' to make room for the text +that you have inserted. Likewise, when you delete text behind the cursor, +characters to the right of the cursor get `pulled back' to fill in the +blank space created by the removal of the text. A list of the basic bare +essentials for editing the text of an input line follows. + +@table @asis +@item @kbd{C-b} +Move back one character. +@item @kbd{C-f} +Move forward one character. +@item @key{DEL} +Delete the character to the left of the cursor. +@item @kbd{C-d} +Delete the character underneath the cursor. +@item @var{c} +Insert an ordinary printing character @var{c} into the line at the cursor. +@item @kbd{C-_} +Undo the last thing that you did. You can undo all the way back to an +empty line. +@end table + +@node Readline Movement Commands, Readline Killing Commands, Readline Bare Essentials, Readline Interaction +@appendixsubsec Movement Commands + + +The above table describes the most basic possible keystrokes that you need +in order to do editing of the input line. For your convenience, many +other commands have been added in addition to @kbd{C-b}, @kbd{C-f}, +@kbd{C-d}, and @key{DEL}. Here are some commands for moving more rapidly +about the line. + +@table @kbd +@item C-a +Move to the start of the line. +@item C-e +Move to the end of the line. +@item M-f +Move forward a word. +@item M-b +Move backward a word. +@item C-l +Clear the screen, reprinting the current line at the top. +@end table + +Notice how @kbd{C-f} moves forward a character, while @kbd{M-f} moves +forward a word. It is a loose convention that control keystrokes +operate on characters while meta keystrokes operate on words. + +@node Readline Killing Commands, Readline Arguments, Readline Movement Commands, Readline Interaction +@appendixsubsec Killing Commands + +@dfn{Killing} text means to delete the text from the line, but to save +it away for later use, usually by @dfn{yanking} it back into the line. +If the description for a command says that it `kills' text, then you can +be sure that you can get the text back in a different (or the same) +place later. + +Here is the list of commands for killing text. + +@table @kbd +@item C-k +Kill the text from the current cursor position to the end of the line. + +@item M-d +Kill from the cursor to the end of the current word, or if between +words, to the end of the next word. + +@item M-@key{DEL} +Kill from the cursor the start ofthe previous word, or if between words, to the start of the previous word. + +@item C-w +Kill from the cursor to the previous whitespace. This is different than +@kbd{M-@key{DEL}} because the word boundaries differ. + +@end table + +And, here is how to @dfn{yank} the text back into the line. Yanking +is + +@table @kbd +@item C-y +Yank the most recently killed text back into the buffer at the cursor. + +@item M-y +Rotate the kill-ring, and yank the new top. You can only do this if +the prior command is @kbd{C-y} or @kbd{M-y}. +@end table + +When you use a kill command, the text is saved in a @dfn{kill-ring}. +Any number of consecutive kills save all of the killed text together, so +that when you yank it back, you get it in one clean sweep. The kill +ring is not line specific; the text that you killed on a previously +typed line is available to be yanked back later, when you are typing +another line. + +@node Readline Arguments, , Readline Killing Commands, Readline Interaction +@appendixsubsec Arguments + +You can pass numeric arguments to Readline commands. Sometimes the +argument acts as a repeat count, other times it is the @i{sign} of the +argument that is significant. If you pass a negative argument to a +command which normally acts in a forward direction, that command will +act in a backward direction. For example, to kill text back to the +start of the line, you might type @kbd{M--} @kbd{C-k}. + +The general way to pass numeric arguments to a command is to type meta +digits before the command. If the first `digit' you type is a minus +sign (@kbd{-}), then the sign of the argument will be negative. Once +you have typed one meta digit to get the argument started, you can type +the remainder of the digits, and then the command. For example, to give +the @kbd{C-d} command an argument of 10, you could type @kbd{M-1 0 C-d}. + + +@node Readline Init File, , Readline Interaction, Readline Top +@appendixsec Readline Init File + +Although the Readline library comes with a set of Emacs-like +keybindings, it is possible that you would like to use a different set +of keybindings. You can customize programs that use Readline by putting +commands in an @dfn{init} file in your home directory. The name of this +file is @file{~/.inputrc}. + +When a program which uses the Readline library starts up, it reads the file +@file{~/.inputrc}, and sets the keybindings. + +@menu +* Readline Init Syntax:: Syntax for the commands in @file{~/.inputrc}. +* Readline Vi Mode:: Switching to @code{vi} mode in Readline. +@end menu + +@node Readline Init Syntax, Readline Vi Mode, Readline Init File, Readline Init File +@appendixsubsec Readline Init Syntax + +You can start up with a vi-like editing mode by placing + +@example +@code{set editing-mode vi} +@end example + +@noindent +in your @file{~/.inputrc} file. + +You can have Readline use a single line for display, scrolling the input +between the two edges of the screen by placing + +@example +@code{set horizontal-scroll-mode On} +@end example + +@noindent +in your @file{~/.inputrc} file. + +The syntax for controlling keybindings in the @file{~/.inputrc} file is +simple. First you have to know the @i{name} of the command that you +want to change. The following pages contain tables of the command name, the +default keybinding, and a short description of what the command does. + +Once you know the name of the command, simply place the name of the key +you wish to bind the command to, a colon, and then the name of the +command on a line in the @file{~/.inputrc} file. Here is an example: + +@example +# This is a comment line. +Meta-Rubout: backward-kill-word +Control-u: universal-argument +@end example + +@menu +* Commands For Moving:: Moving about the line. +* Commands For History:: Getting at previous lines. +* Commands For Text:: Commands for changing text. +* Commands For Killing:: Commands for killing and yanking. +* Numeric Arguments:: Specifying numeric arguments, repeat counts. +* Commands For Completion:: Getting Readline to do the typing for you. +* Miscellaneous Commands:: Other miscillaneous commands. +@end menu + +@node Commands For Moving, Commands For History, Readline Init Syntax, Readline Init Syntax +@appendixsubsubsec Moving +@table @code +@item beginning-of-line (C-a) +Move to the start of the current line. + +@item end-of-line (C-e) +Move to the end of the line. + +@item forward-char (C-f) +Move forward a character. + +@item backward-char (C-b) +Move back a character. + +@item forward-word (M-f) +Move forward to the end of the next word. + +@item backward-word (M-b) +Move back to the start of this, or the previous, word. + +@item clear-screen (C-l) +Clear the screen leaving the current line at the top of the screen. + +@end table + +@node Commands For History, Commands For Text, Commands For Moving, Readline Init Syntax +@appendixsubsubsec Using the History + +@table @code +@item accept-line (Newline, Return) +Accept the line regardless of where the cursor is. If this line is +non-empty, add it to the history list. If this line was a history +line, then restore the history line to its original state. + +@item previous-history (C-p) +Move `up' through the history list. + +@item next-history (C-n) +Move `down' through the history list. + +@item beginning-of-history (M-<) +Move to the first line in the history. + +@item end-of-history (M->) +Move to the end of the input history, i.e., the line you are entering! + +@item reverse-search-history (C-r) +Search backward starting at the current line and moving `up' through +the history as necessary. This is an incremental search. + +@item forward-search-history (C-s) +Search forward starting at the current line and moving `down' through +the the history as neccessary. + +@end table + +@node Commands For Text, Commands For Killing, Commands For History, Readline Init Syntax +@appendixsubsubsec Changing Text + +@table @code +@item delete-char (C-d) +Delete the character under the cursor. If the cursor is at the +beginning of the line, and there are no characters in the line, and +the last character typed was not C-d, then return EOF. + +@item backward-delete-char (Rubout) +Delete the character behind the cursor. A numeric arg says to kill +the characters instead of deleting them. + +@item quoted-insert (C-q, C-v) +Add the next character that you type to the line verbatim. This is +how to insert things like C-q for example. + +@item tab-insert (M-TAB) +Insert a tab character. + +@item self-insert (a, b, A, 1, !, ...) +Insert an ordinary printing character into the line. + +@item transpose-chars (C-t) +Drag the character before point forward over the character at point. +Point moves forward as well. If point is at the end of the line, then +transpose the two characters before point. Negative args don't work. + +@item transpose-words (M-t) +Drag the word behind the cursor past the word in front of the cursor +moving the cursor over that word as well. + +@item upcase-word (M-u) +Uppercase the current (or following) word. With a negative argument, +do the previous word, but do not move point. + +@item downcase-word (M-l) +Lowercase the current (or following) word. With a negative argument, +do the previous word, but do not move point. + +@item capitalize-word (M-c) +Uppercase the current (or following) word. With a negative argument, +do the previous word, but do not move point. + +@end table + +@node Commands For Killing, Numeric Arguments, Commands For Text, Readline Init Syntax +@appendixsubsubsec Killing And Yanking + +@table @code + +@item kill-line (C-k) +Kill the text from the current cursor position to the end of the line. + +@item backward-kill-line () +Kill backward to the beginning of the line. This is normally unbound. + +@item kill-word (M-d) +Kill from the cursor to the end of the current word, or if between +words, to the end of the next word. + +@item backward-kill-word (M-DEL) +Kill the word behind the cursor. + +@item unix-line-discard (C-u) +Kill the entire line. This is similar to the use of the Unix kill +character (often also @key{C-u}), save that here the killed text can be +retrieved later (since it goes on the kill-ring). + +@item unix-word-rubout (C-w) +Kill the current word, like the Unix word erase character. The killed +text goes on the kill-ring. This is different than +@code{backward-kill-word} because the word boundaries differ. + +@item yank (C-y) +Yank the top of the kill ring into the buffer at point. + +@item yank-pop (M-y) +Rotate the kill-ring, and yank the new top. You can only do this if +the prior command is @code{yank} or @code{yank-pop}. +@end table + +@node Numeric Arguments, Commands For Completion, Commands For Killing, Readline Init Syntax +@appendixsubsubsec Numeric Arguments +@table @code + +@item digit-argument (M-0, M-1, ... M--) +Add this digit to the argument already accumulating, or start a new +argument. @kbd{M--} starts a negative argument. + +@item universal-argument () +Do what @key{C-u} does in emacs. By default, this is not bound to any keys. +@end table + + +@node Commands For Completion, Miscellaneous Commands, Numeric Arguments, Readline Init Syntax +@appendixsubsubsec Letting Readline Type + +@table @code +@item complete (TAB) +Attempt to do completion on the text before point. This is +implementation defined. Generally, if you are typing a filename +argument, you can do filename completion; if you are typing a command, +you can do command completion, if you are typing in a symbol to GDB, you +can do symbol name completion, if you are typing in a variable to Bash, +you can do variable name completion... + +@item possible-completions (M-?) +List the possible completions of the text before point. +@end table + +@node Miscellaneous Commands, , Commands For Completion, Readline Init Syntax +@appendixsubsubsec Other Commands +@table @code + +@item abort (@kbd{C-g}) +The line editing commands @code{reverse-search-history} (@kbd{C-r}) and +@code{forward-search-history} (@kbd{C-s} go into a separate input mode; +you can abort the search, and return to normal input mode, by using the +@code{abort} (@kbd{C-g}) command. + +@item do-uppercase-version (@kbd{M-a}, @kbd{M-b}, @dots) +Run the command that is bound to your uppercase brother. + +@item prefix-meta (@key{ESC}) +Make the next character that you type be metafied. This is for +people without a meta key. @kbd{@key{ESC}-f} is equivalent to @kbd{M-f}. + +@item undo (@kbd{C-_}) +Incremental undo, separately remembered for each line. + +@item revert-line (@kbd{M-r}) +Undo all changes made to this line. This is like typing the `undo' +command enough times to get back to the beginning. +@end table + +@node Readline vi Mode, , Readline Init Syntax, Readline Init File +@appendixsubsec Readline @code{vi} Mode + +While the Readline library does not have a full set of @code{vi} editing +functions, it does contain enough to allow simple editing of the line. + +In order to switch interactively between Emacs and @code{vi} editing modes, use +the command @kbd{M-C-j} (@code{toggle-editing-mode}). + +When you enter a line in @code{vi} mode, you are already in +``insertion'' mode, as if you had typed an @kbd{i}. Pressing @key{ESC} +switches you into ``edit'' mode, where you can edit the text of the line +with the standard @code{vi} movement keys, move to previous history +lines with @kbd{k}, to following lines with @kbd{j}, and so forth. + + + + |