178 lines
6.2 KiB
Text
178 lines
6.2 KiB
Text
Rio is the Plan 9 window system.
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To read more of this window, the up and down arrows
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scroll the text up and down half screens.
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To effectively use rio, you need at least a three
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button mouse. If you only have a two button mouse you
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can emulate the middle button by holding down shift key
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whilst pressing the right button.
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Button 1, 2, and 3 are used to refer to the left,
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middle, and right buttons respectively.
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THE POP-UP MENU
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Pressing and holding down button 3 on the desktop or
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shell window will give you a menu with the following
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options:
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* New - create a new window
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* Resize - reshape a window
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* Move - move a window without reshaping it
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* Delete - close a window
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* Hide - hides a window from display (it will appear
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in this menu)
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* <label> - the label of a hidden window,
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selecting it unhides it
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You select an item by releasing the button over the
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menu item. rio uses the same button that started an
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action throughout that operation. If you press another
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button during the action the operation is aborted and
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any intermediate changes are reversed.
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The menu acts as a action verb selector which then
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requires an object (i.e. window) to be picked to
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indicate which window the verb is to act on. A further
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mouse action may then be required.
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EXAMPLES
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After selecting New, the cursor will change into a
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cross. Using button 3 again, you should then drag out
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a rectangle to indicate the size and location of the
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new window. When you release the button a new window
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will be created.
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New windows will contain the rc shell. Invoking a rio
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program from the shell will allow that program to take
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over the window. As there is no job control in the
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shell (e.g. &, fg, bg), you just create another window
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if you want to run another program concurrently.
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To Resize a window, you select Resize, then click
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(remember using the same button that started the
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action, i.e. button 3) on the window you want to
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resize. The cursor will change to a cross-hair theat
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will allow you to drag out the desired shape of the
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window.
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After selecting Move, click and keep the button
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depressed over the window you want to move, then move
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the mouse to move the red rectangle that represents the
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new location you want. Release the button to finish
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the action.
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Delete and Hide both operate by requiring you to click
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on the window you wish to respectively Delete or Hide.
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WINDOW CONTROL TIPS
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Clicking on a window brings it to the front.
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You can directly change the shape of a window by
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clicking and dragging on the edge or corner of the
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window border. Button 1 or 2 will allow you to drag
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the edge or corner to a new size, and Button 3 will
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allow you to move the window.
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The pop-up menu remembers the last command chosen, so
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as a short cut you can just press and release button 3
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without moving the mouse between pressing and releasing
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to select the previous command again.
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BASIC TEXT CONTROL
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Unlike in other systems, the text cursor can only be
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controlled by the mouse or the side-effects of certain
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commands.
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Clicking with button 1 will move the text insertion
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point (indicated by an I-beam) to just before the
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character closest to the mouse pointer. Dragging
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across a section of text will select that portion of
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text. It may be useful to know that the insertion
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I-beam represents an empty selection (between two
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characters). In text editors, the current selection is
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known as "dot".
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In the shell window button 2 will invoke a pop-up menu.
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Most of it's commands operate on dot.
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* cut - moves the contents of the dot to the clipboard
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if dot is non-empty
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* paste - replaces dot with the contents of the clipboard
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* snarf - copies dot to the clipboard
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* plumb - sends dot (or text surrounding dot, if dot is
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empty)to the plumber.
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* send - completes the current input line with the dot,
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if it is non-empty, or the contents of the clipboard.
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If the dot is non-empty it does a snarf at the same time.
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* scroll - toggles the automatic scrolling of the window
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on output.
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Double-clicking will allow you to automatically select
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a section of text surrounding that point. The
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selection is made by an analysis of appropriate
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delimeters. A whole line is selected by
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double-clicking at either end of the line. A quoted or
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bracketed selection is made by double-clicking just
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inside of the quote or bracket.
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SCROLLING
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The arrow keys will let you scroll up or down by half a
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page at a time.
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Clicking button 1 on the scrollbar scrolls up by half a
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page. Button 3 scrolls down by half a page. Button 2
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jumps to position in the document relative to the
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position on the scrollbar clicked. Holding a button on
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the scrollbar will have the effect of invoking the
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clicking action continuously.
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The white elevator box on the scrollbar is sized
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proportionally to the proportion of the document that
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is currently visible.
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Scrolling does not affect the text cursor.
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RIO AND THE RC SHELL WINDOW
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Rc is a command interpreter for Plan 9 that provides
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similar facilities to UNIX's Bourne shell. See the
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additional references at the end of this document for
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information specifically about rc.
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Rio provides some additional features that enhance the
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interface to programs that use the text console. The
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rc shell command interpreter is one such program.
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Rc commands are typed after the prompt on the last line
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of the text buffer. The commands are sent to rc only
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after each newline so line editing may be performed if
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desired. You can move the cursor and edit the previous
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lines of commands and program output but none of this
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will be interpreted by rc shell.
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The interpretation of commands is supressed altogether
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when ESC is pressed to put the window in hold mode.
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The window border and text will change to dark blue to
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indicate the hold mode is active. In this mode you can
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type multiple lines of commands and edit them.
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Pressing ESC again will release the hold and send the
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lines of text to the rc command interpreter.
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The DEL key sends an 'interrupt' note to all processes
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in the window's process group. The usual intent is to
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terminate the execution of the current command. It is
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also a convenient short cut for ensuring you have a
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fresh command prompt.
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FURTHER INFORMATION
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For further information, try the rio(1) manual page.
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Type "man rio" or click on rio(1) in either of these
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sentences and select plumb from the button 2 menu.
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