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NAME
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acme – control files for text windows
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SYNOPSIS
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acme [ −f varfont ] [ −F fixfont ] [ file ... ]
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DESCRIPTION
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The text window system acme(1) serves a variety of files for reading,
writing, and controlling windows. Some of them are virtual versions
of system files for dealing with the virtual console; others control
operations of acme itself. When a command is run under acme, a
directory holding these files is posted as the 9P service acme
(using 9pserve(4)).
Some of these files supply virtual versions of services available
from the underlying environment, in particular the character terminal
files in Plan 9’s cons(3). (Unlike in Plan 9’s rio(1), each command
under acme sees the same set of files; there is not a distinct
/dev/cons for each window.) Other files are unique to acme.
acme is a subdirectory used by win (see acme(1)) as a mount point
for the acme files associated with the window in which win is
running. It has no specific function under acme itself.
cons is the standard and diagnostic output file for all commands
run under acme. (Input for commands is redirected to /dev/null.)
Text written to cons appears in a window labeled dir/+Errors,
where dir is the directory in which the command was run. The window
is created if necessary, but not until text is actually written.
consctl
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Is an empty unwritable file present only for compatibility; there
is no way to turn off ‘echo’, for example, under acme.
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indexholds a sequence of lines of text, one per window. Each line
has 5 decimal numbers, each formatted in 11 characters plus a
blank--the window ID; number of characters (runes) in the tag; number
of characters in the body; a 1 if the window is a directory, 0
otherwise; and a 1 if the window is modified, 0 otherwise--followed
by the tag up to a
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newline if present. Thus at character position 5x12 starts the
name of the window. If a file has multiple zeroxed windows open,
only the most recently used will appear in the index file.
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labelis an empty file, writable without effect, present only for
compatibility with rio.
new A directory analogous to the numbered directories (q.v.). Accessing
any file in new creates a new window. Thus to cause text to appear
in a new window, write it to /dev/new/body. For more control,
open /dev/new/ctl and use the interface described below.
Each acme window has associated a directory numbered by its ID.
Window IDs are chosen sequentially and may be discovered by the
ID command, by reading the ctl file, or indirectly through the
index file. The files in the numbered directories are as follows.
addr may be written with any textual address (line number, regular
expression, etc.), in the format understood by button 3 but without
the initial colon, including compound addresses, to set the address
for text accessed through the data file. When read, it returns
the value of the address that would next be read or written through
the data file, in the
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format #m,#n where m and n are character (not byte) offsets. If
m and n are identical, the format is just #m. Thus a regular expression
may be evaluated by writing it to addr and reading it back. The
addr address has no effect on the user’s selection of text.
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body holds contents of the window body. It may be read at any byte
offset. Text written to body is always appended; the file offset
is ignored.
ctl may be read to recover the five numbers as held in the index
file, described above, plus three more fields: the width of the
window in pixels, the name of the font used in the window, and
the width of a tab character in pixels. Text messages may be written
to ctl to affect the window. Each message is terminated by a newline
and multiple
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messages may be sent in a single write.
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addr=dot Set the addr address to that of the user’s selected text
in the window.
clean Mark the window clean as though it has just been written.
dirty Mark the window dirty, the opposite of clean.
cleartag Remove all text in the tag after the vertical bar.
del Equivalent to the Del interactive command.
delete Equivalent to the Delete interactive command.
dot=addr Set the user’s selected text in the window to the text
addressed by the addr address.
dump command
Set the command string to recreate the window from a dump file.
dumpdir directory
Set the directory in which to run the command to recreate the
window from a dump file.
get Equivalent to the Get interactive command with no arguments;
accepts no arguments.
limit=addr When the ctl file is first opened, regular expression
context searches in addr addresses examine the whole file; this
message restricts subsequent searches to the current addr address.
mark Cancel nomark, returning the window to the usual state wherein
each modification to the body must be undone individually.
name name Set the name of the window to name.
nomark Turn off automatic ‘marking’ of changes, so a set of related
changes may be undone in a single Undo interactive command.
put Equivalent to the Put interactive command with no arguments;
accepts no arguments.
show Guarantee at least some of the selected text is visible on
the display.
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data is used in conjunction with addr for random access to the
contents of the body. The file offset is ignored when writing
the data file; instead the location of the data to be read or
written is determined by the state of the addr file. Text, which
must contain only whole characters (no ‘partial runes’), written
to data replaces the characters
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addressed by the addr file and sets the address to the null string
at the end of the written text. A read from data returns as many
whole characters as the read count will permit starting at the
beginning of the addr address (the end of the address has no effect)
and sets the address to the null string at the end of the returned
characters.
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errors
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Writing to the errors file appends to the body of the dir/+Errors
window, where dir is the directory currently named in the tag.
The window is created if necessary, but not until text is actually
written.
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eventWhen a window’s event file is open, changes to the window
occur as always but the actions are also reported as messages
to the reader of the file. Also, user actions with buttons 2 and
3 (other than chorded Cut and Paste, which behave normally) have
no immediate effect on the window; it is expected that the program
reading the event file
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will interpret them. The messages have a fixed format: a character
indicating the origin or cause of the action, a character indicating
the type of the action, four free-format blank-terminated decimal
numbers, optional text, and a newline. The first and second numbers
are the character addresses of the action, the third is a flag,
and the final is a
count of the characters in the optional text, which may itself
contain newlines. The origin characters are E for writes to the
body or tag file, F for actions through the window’s other files,
K for the keyboard, and M for the mouse. The type characters are
D for text deleted from the body, d for text deleted from the
tag, I for text inserted to the body,
i for text inserted to the tag, L for a button 3 action in the
body, l for a button 3 action in the tag, X for a button 2 action
in the body, and x for a button 2 action in the tag.
If the relevant text has less than 256 characters, it is included
in the message; otherwise it is elided, the fourth number is 0,
and the program must read it from the data file if needed. No
text is sent on a D or d message.
For D, d, I, and i the flag is always zero. For X and x, the 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;
if so, another complete message will follow describing the expansion
exactly as if it had been
indicated explicitly (its flag will always be 0); 8 if the command
has an extra (chorded) argument; if so, two more complete messages
will follow reporting the argument (with all numbers 0 except
the character count) and where it originated, in the form of a
fully-qualified button 3 style address.
For L and l, the flag is the bitwise OR of the following: 1 if
acme can interpret the action without loading a new file; 2 if
a second (post-expansion) message follows, analogous to that with
X messages; 4 if the text is a file or window name (perhaps with
address) rather than plain literal text.
For messages with the 1 bit on in the flag, writing the message
back to the event file, but with the flag, count, and text omitted,
will cause the action to be applied to the file exactly as it
would have been if the event file had not been open.
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tag holds contents of the window tag. It may be read at any byte
offset. Text written to tag is always appended; the file offset
is ignored.
xdataThe xdata file like data except that reads stop at the end
address.
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SOURCE
SEE ALSO
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