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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 mounted on
/mnt/acme (also bound to /mnt/wsys) and also /dev; the files mentioned
here appear in both those directories.
Some of these files supply virtual versions of services available
from the underlying environment, in particular the character terminal
files cons(3). (Unlike in 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.
acmeis 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.
consis 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
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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index
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holds 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 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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label
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is an empty file, writable without effect, present only for compatibility
with rio.
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log reports a log of window operations since the opening of the
log file. Each line describes a single operation using three fields
separated by single spaces: the decimal window ID, the operation,
and the window name. Reading from log blocks until there is an
operation to report, so reading the file can be used
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to monitor editor activity and react to changes. The reported
operations are new (window creation), zerox (window creation via
zerox), get, put, del (window deletion), and focus (window focus
change). The window name can be the empty string; in particular
it is empty in new log entries corresponding
to windows created by external programs.
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new is 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.
addrmay 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
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written through the data file, formatted as 2 decimal numbers
m and n, each formatted in 11 characters plus a blank. M and n
are the character (not byte) offsets of the beginning and end
of the address, which would be expressed in acme 's input language
as #m,#n. 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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bodyholds 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
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terminated by a newline and multiple 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 commandSet 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.
font path Equivalent to the Font interactive command with a single
(required) argument.
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.
menu Maintain Undo, Redo, and Put in the left half of the tag.
(This is the default for file windows.)
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.
nomenu Do not maintain Undo, Redo, and Put in the left half of
the tag. (This is the default for directory and error windows.)
noscroll Turn off automatic `scrolling' of the window to show text
written to the body.
put Equivalent to the Put interactive command with no arguments;
accepts no arguments.
scratch Turn off tracking the `dirty' status, the window stays
clean.
scroll Cancel a noscroll message, returning the window to the default
state wherein each write to the body file causes the window to
`scroll' to display the new text.
show Guarantee at least some of the selected text is visible on
the display.
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datais 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
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data replaces the characters 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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event
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When 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 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.
rdsel
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holds the contents of the current selection. It may be read at
any byte offset.
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wrsel
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writing to the wrsel file modifies the text in the selection.
Text written always replaces the text selected; the file offset
is ignored.
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xdata
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The xdata file like data except that reads stop at the end address.
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