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.\" Copyright (c) 2011 Kristaps Dzonsons <kristaps@bsd.lv>
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.Dd $Mdocdate$
.Dt MANDOCDB 8
.Os
.Sh NAME
.Nm mandocdb
.Nd index UNIX manuals
.Sh SYNOPSIS
.Nm
.Op Fl avW
.Op Fl C Ar file
.Nm
.Op Fl avW
.Ar dir ...
.Nm
.Op Fl vW
.Fl d Ar dir
.Op Ar
.Nm
.Op Fl vW
.Fl u Ar dir
.Op Ar
.Nm
.Fl t Ar
.Sh DESCRIPTION
The
.Nm
utility extracts keywords from
.Ux
manuals and indexes them in a
.Sx Keyword Database
and
.Sx Index Database
for fast retrieval by
.Xr apropos 1 ,
.Xr whatis 1 ,
and
.Xr man 1 Ns 's
.Fl k
option.
.Pp
By default,
.Nm
creates databases in each
.Ar dir
using the files
.Sm off
.Sy man Ar section Li /
.Op Ar arch Li /
.Ar title . section
.Sm on
and
.Sm off
.Sy cat Ar section Li /
.Op Ar arch Li /
.Ar title . Sy 0
.Sm on
in that directory;
existing databases are truncated.
If
.Ar dir
is not provided,
.Nm
uses the default paths stipulated by
.Xr man 1 .
.Pp
The arguments are as follows:
.Bl -tag -width "-C file"
.It Fl a
Use all directories and files found below
.Ar dir ... .
.It Fl C Ar file
Specify an alternative configuration
.Ar file
in
.Xr man.conf 5
format.
.It Fl d Ar dir
Merge (remove and re-add)
.Ar
to the database in
.Ar dir
without truncating it.
.It Fl t Ar
Check the given
.Ar files
for potential problems.
No databases are modified.
Implies
.Fl a
and
.Fl W .
All diagnostic messages are printed to the standard output;
the standard error output is not used.
.It Fl u Ar dir
Remove
.Ar
from the database in
.Ar dir
without truncating it.
.It Fl v
Display all files added or removed to the index.
.It Fl W
Print warnings about potential problems with manual pages
to the standard error output.
.El
.Pp
If fatal parse errors are encountered while parsing, the offending file
is printed to stderr, omitted from the index, and the parse continues
with the next input file.
.Ss Index Database
The index database,
.Pa mandoc.index ,
is a
.Xr recno 3
database with record values consisting of
.Pp
.Bl -enum -compact
.It
the character
.Cm d ,
.Cm a ,
or
.Cm c
to indicate the file type
.Po
.Xr mdoc 7 ,
.Xr man 7 ,
and post-formatted, respectively
.Pc ,
.It
the filename relative to the databases' path,
.It
the manual section,
.It
the manual title,
.It
the architecture
.Pq often empty ,
.It
and the description.
.El
.Pp
Each of the above is NUL-terminated.
.Pp
If the record value is zero-length, it is unassigned.
.Ss Keyword Database
The keyword database,
.Pa mandoc.db ,
is a
.Xr btree 3
database of NUL-terminated keywords (record length is non-zero string
length plus one) mapping to a 16-byte binary field consisting of the
64-bit keyword type and the 64-bit
.Sx Index Database
record number, both in network-byte order.
.Pp
The type bit-mask consists of the following
values mapping into
.Xr mdoc 7
macro identifiers:
.Pp
.Bl -column "x0x0000000000000001ULLx" "xLix" -offset indent -compact
.It Li 0x0000000000000001ULL Ta \&An
.It Li 0x0000000000000002ULL Ta \&Ar
.It Li 0x0000000000000004ULL Ta \&At
.It Li 0x0000000000000008ULL Ta \&Bsx
.It Li 0x0000000000000010ULL Ta \&Bx
.It Li 0x0000000000000020ULL Ta \&Cd
.It Li 0x0000000000000040ULL Ta \&Cm
.It Li 0x0000000000000080ULL Ta \&Dv
.It Li 0x0000000000000100ULL Ta \&Dx
.It Li 0x0000000000000200ULL Ta \&Em
.It Li 0x0000000000000400ULL Ta \&Er
.It Li 0x0000000000000800ULL Ta \&Ev
.It Li 0x0000000000001000ULL Ta \&Fa
.It Li 0x0000000000002000ULL Ta \&Fl
.It Li 0x0000000000004000ULL Ta \&Fn
.It Li 0x0000000000008000ULL Ta \&Ft
.It Li 0x0000000000010000ULL Ta \&Fx
.It Li 0x0000000000020000ULL Ta \&Ic
.It Li 0x0000000000040000ULL Ta \&In
.It Li 0x0000000000080000ULL Ta \&Lb
.It Li 0x0000000000100000ULL Ta \&Li
.It Li 0x0000000000200000ULL Ta \&Lk
.It Li 0x0000000000400000ULL Ta \&Ms
.It Li 0x0000000000800000ULL Ta \&Mt
.It Li 0x0000000001000000ULL Ta \&Nd
.It Li 0x0000000002000000ULL Ta \&Nm
.It Li 0x0000000004000000ULL Ta \&Nx
.It Li 0x0000000008000000ULL Ta \&Ox
.It Li 0x0000000010000000ULL Ta \&Pa
.It Li 0x0000000020000000ULL Ta \&Rs
.It Li 0x0000000040000000ULL Ta \&Sh
.It Li 0x0000000080000000ULL Ta \&Ss
.It Li 0x0000000100000000ULL Ta \&St
.It Li 0x0000000200000000ULL Ta \&Sy
.It Li 0x0000000400000000ULL Ta \&Tn
.It Li 0x0000000800000000ULL Ta \&Va
.It Li 0x0000001000000000ULL Ta \&Vt
.It Li 0x0000002000000000ULL Ta \&Xr
.El
.Sh IMPLEMENTATION NOTES
The time to construct a new database pair grows linearly with the
number of keywords in the input files.
However, removing or updating entries with
.Fl u
or
.Fl d ,
respectively, grows as a multiple of the index length and input size.
.Sh FILES
.Bl -tag -width Ds
.It Pa mandoc.db
A
.Xr btree 3
keyword database mapping keywords to a type and file reference in
.Pa mandoc.index .
.It Pa mandoc.index
A
.Xr recno 3
database of indexed file-names.
.It Pa /etc/man.conf
The default
.Xr man 1
configuration file.
.El
.Sh EXIT STATUS
The
.Nm
utility exits with one of the following values:
.Pp
.Bl -tag -width Ds -compact
.It 0
No errors occurred.
.It 5
Invalid command line arguments were specified.
No input files have been read.
.It 6
An operating system error occurred, for example memory exhaustion or an
error accessing input files.
Such errors cause
.Nm
to exit at once, possibly in the middle of parsing or formatting a file.
The output databases are corrupt and should be removed.
.El
.Sh DIAGNOSTICS
If the following errors occur, the
.Nm
databases should be rebuilt.
.Bl -diag
.It "%s: Corrupt database"
The keyword database file indicated by
.Pa %s
is unreadable.
.It "%s: Corrupt index"
The index database file indicated by
.Pa %s
is unreadable.
.It "%s: Path too long"
The file
.Pa %s
is too long.
This usually indicates database corruption or invalid command-line
arguments.
.El
.Sh SEE ALSO
.Xr apropos 1 ,
.Xr man 1 ,
.Xr whatis 1 ,
.Xr btree 3 ,
.Xr recno 3 ,
.Xr man.conf 5
.Sh HISTORY
A
.Nm makewhatis
utility first appeared in
.Bx 2 .
It was rewritten in
.Xr perl 1
for
.Ox 2.7
and in C for
.Ox 5.1 .
.Pp
The
.Ar dir
argument first appeared in
.Nx 1.0 ;
the options
.Fl dtu
in
.Ox 2.7 ;
and the options
.Fl aCvW
in
.Ox 5.1 .
.Sh AUTHORS
.An -nosplit
.An Bill Joy
wrote the original
.Bx
.Nm makewhatis
in February 1979,
.An Marc Espie
started the Perl version in 2000,
and the current version of
.Nm
was written by
.An Kristaps Dzonsons Aq Mt kristaps@bsd.lv .
