NAME

SYNOPSIS

. /lib/acme.rc

newwindow

winread file

winwrite file

winctl cmd

windump [ dumpdir | - ] [ dumpcmd | - ]

winname name

windel [ sure ]

winwriteevent c1 c2 q0 q1 [ eq0 eq1 flag textlen text chordarg chordaddr ]

wineventloop

DESCRIPTION

Acme clients read the event files (see for the windows they control, reacting to the events. The events are presented in a format that is easy to read with C programs but hard to read with shell scripts.

Acmeevent reads an event stream from standard input, printing a shell-friendly version of the events, one per line, on standard output. Each output line from acmeevent has the form:

event c1 c2 q0 q1 eq0 eq1 flag textlen text chordarg chordaddr

The fields are:

c1

A character indicating the origin or cause of the action. The possible causes are: a write to the body or tag file (E), a write to the window's other files (F), input via the keyboard (K), and input via the mouse (M).

c2

A character indicating the type of action. The possible types are: text deleted from the body (D), text deleted from the tag (d), text inserted in the body (I), text inserted in the tag (i), a button 3 action in the body (L), a button 3 action in the tag (l), a button 2 action in the body (X), and a button 2 action in the tag (x).

q0, q1

The character addresses of the action.

eq0, q1

The expanded character addresses of the action. If the text indicated by q0, q1 is a null string that has a non-null expansion, eq0, eq1 are the addresses of the expansion. Otherwise they are the same as q0, q1.

flag

Flag is a bitwise OR (reported decimally) of the following: 1 if the text indicated is recognized as an acme built-in command; 2 if the text indicated is a null string that has a non-null expansion (see eq0, eq1 above); 8 if the command has an extra (chorded) argument (see chordarg below). Flag remains from the event format. Because eq0, eq1, and chordarg are explicit in each event (unlike in events), flag can usually be ignored.

textlen

The length of the action text (or its expansion) for button 2 and button 3 events in characters.

text

If textlen is less than 256 chracters, text is the action text itself. Otherwise it is an empty string and must be read from the data file.

chordarg

The chorded argument for an action.

chordorigin

If the chord argument is in the body of a named window, chordorigin specifies the full address of the argument, as in /etc/group:#123,#234.

To experiment with acmeevent, create an empty window in acme (using New),type

9p read acme/$winid/event | acmeevent
    

inside it, and execute it. Actions performed on the window will be printed as events in the +Errors window.

Acme.rc is a library of shell functions useful for writing acme clients.

Newwindow creates a new acme window and sets $winid to the new window's id. The other commands all use $winid to determine which window to operate on.

Winread prints the current window's file to standard output. It is equivalent to cat /mnt/acme/acme/$winid/file on Plan 9. Similarly, winwrite writes standard input to the current window's file. Winread and winwrite are useful mainly in building more complex functions.

Winctl writes cmd to the window's ctl file. The most commonly-used command is clean, which marks the window as clean. See for a full list of commands.

Windump sets the window's dump directory and dump command (see If either argument is omitted or is -, that argument is not set.

Winname sets the name displayed in the window's tag.

Windel simulates the Del command. If the argument sure is given, it simulates the Delete command.

Winwriteevent writes an event to the window's event file. The event is in the format produced by acmeevent. Only the first four arguments are necessary: the rest are ignored. Event handlers should call winwriteevent to pass unhandled button 2 or button 3 events back to acme for processing.

Wineventloop executes the current window's event file, as output by acmeevent. It returns when the window has been deleted. Before running wineventloop , clients must define a shell function named event, which will be run for each incoming event, as rc executes the output of acmeevent. A typical event function need only worry about button 2 and button 3 events. Those events not handled should be sent back to acme with winwriteevent.

EXAMPLE

fn event {
	switch($1$2){
	case Mx MX    # button 2 - pass back to acme
		winwriteevent $*
	case Ml ML    # button 3 - open new window on dictionary or entry
		{
			if(~ $dict NONE)
				dictwin /adict/$7/ $7
			if not
				dictwin /adict/$dict/$7 $dict $7
		} &
	}
}
    

Note that the button 3 handler starts a subshell in which to run dictwin. That subshell will create a new window, set its name, possibly fill the window with a dictionary list or dictionary entry, mark the window as clean, and run the event loop:

fn dictwin {
	newwindow
	winname $1
	dict=$2
	if(~ $dict NONE)
		dict -d '?' >[2=1] | sed 1d | winwrite body
	if(~ $#* 3)
		dict -d $dict $3 >[2=1] | winwrite body
	winctl clean
	wineventloop
}
    

The script starts with an initial window:

dictwin /adict/ NONE
    

Button 3 clicking on a dictionary name in the initial window will create a new empty window for that dictionary. Typing and button 3 clicking on a word in that window will create a new window with the dictionary's entry for that word.

See /bin/adict for the full implementation.

SOURCE

SEE ALSO

BUGS