10564b1175
groff 1.23.0 added .MR to its -man macro package. The NEWS file states
that the inclusion of the macro "was prompted by its introduction to
Plan 9 from User Space's troff in August 2020." From d32deab it seems
that the name for Plan 9 from User Space's implementation was suggested
by groff maintainer G. Brandon Robinson.
Not sure if the intention was to make these definitions compatible, but
it would be nice if they were.
Currently, Plan 9 from User Space's .MR expects its second argument to
be parenthesized. groff's .MR does not. This results in extra
parentheses appearing in manual references when viewing Plan 9 from User
Space's manual pages on a system using groff.
116 lines
2.7 KiB
Groff
116 lines
2.7 KiB
Groff
.TH FACE 7
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.SH NAME
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face \- face files
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.SH DESCRIPTION
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The directories
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.B /usr/$user/lib/face
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and
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.B /lib/face
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contain a hierarchy of images of people.
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In those directories are subdirectories named by the sizes of
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the corresponding image files:
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.B 48x48x1
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(48 by 48 pixels, one bit per pixel);
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.B 48x48x2
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(48 by 48 pixels, two (grey) bits per pixel);
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.B 48x48x4
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(48 by 48 pixels, four (grey) bits per pixel);
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.B 48x48x8
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(48 by 48 pixels, eight (color-mapped) bits per pixel);
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.B 512x512x8
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(512 by 512 pixels, eight (color-mapped) bits per pixel);
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.B 512x512x24
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(512 by 512 pixels, twenty-four bits per pixel (3 times 8 bits
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per color)).
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The large files serve no special purpose; they are stored
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as images
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(see
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.MR image 7 ).
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The small files are the `icons' displayed by
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.B faces
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and
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.B seemail
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(see Plan 9's
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.IR faces (1));
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for depths less than 4, their format is special.
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.PP
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One- and two-bit deep icons are stored as text, one line of the file to one scan line
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of display.
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Each line is divided into 8-bit, 16-bit, or 32-bit big-endian words,
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stored as a list of comma-separated hexadecimal C constants,
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such as:
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.IP
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.EX
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0x9200, 0x1bb0, 0x003e,
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.EE
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.PP
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This odd format is historical and the programs that read it
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are somewhat forgiving about blanks and the need for commas.
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.PP
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The files
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.BR lib/face/*/.dict
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hold a correspondence between users at machines
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and face files.
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The format is
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.IP
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.EX
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.I machine\fB/\fPuser directory\fB/\fPfile\fB.\fPver
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.EE
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.PP
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The
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.I machine
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is the domain name of the machine sending the message,
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and
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.I user
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the name of the user sending it.
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The
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.I directory
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is a further subdirectory of (say)
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.BR /lib/face/48x48x1 ,
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named by a single letter corresponding to the first character
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of the user names. The
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.I file
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is the name of the file, typically but not always the user name,
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and
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.I ver
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is a number to distinguish different images, for example to
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distinguish the image for Bill Gates from the image for Bill Joy,
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both of which might otherwise be called
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.BR b/bill .
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For example, Bill Gates might be represented by the line
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.IP
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.EX
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microsoft.com/bill b/bill.1
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.EE
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.PP
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If multiple entries exist for a user in the various
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.B .dict
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files,
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.I faces
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chooses the highest pixel size less than or equal to that of the
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display on which it is running.
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.PP
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Finally, or rather firstly, the file
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.B /lib/face/.machinelist
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contains a list of machine/domain pairs, one per line,
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to map any of a set of machines to a single domain name to
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be looked up in the
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.B .dict
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files. The machine name may be a regular expression,
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so for example the entry
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.IP
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.EX
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\&.*research\e.bell-labs\e.com astro
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.EE
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.PP
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maps any of the machines in Bell Labs Research into the
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shorthand name
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.BR astro ,
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which then appears as a domain name in the
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.B .dict
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files.
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.SH "SEE ALSO"
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.MR mail 1 ,
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.MR tweak 1 ,
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.MR image 7
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