206 lines
5.8 KiB
Groff
206 lines
5.8 KiB
Groff
.\" Copyright (c) 2007-2008 Roy Marples
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.\" All rights reserved
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd Mar 16, 2008
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.Dt EINFO 3 SMM
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.Os OpenRC
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.Sh NAME
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.Nm einfo , ewarn , eerror , ebegin ,
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.Nm einfon , ewarnn , eerrorn , ebeginn ,
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.Nm einfov , ewarnv , ebeginv ,
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.Nm einfovn , ewarnvn , ebeginvn ,
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.Nm ewarnx , eerrorx ,
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.Nm eend , ewend ,
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.Nm eendv , ewendv ,
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.Nm ebracket ,
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.Nm eindent , eoutdent ,
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.Nm eindentv , eoutdentv ,
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.Nm eprefix
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.Nd colorful informational output
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.Sh LIBRARY
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Enhanced Information output library (libeinfo, -leinfo)
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.Sh SYNOPSIS
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.In einfo.h
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.Ft int Fn einfo "const char * restrict format" ...
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.Ft int Fn ewarn "const char * restrict format" ...
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.Ft int Fn eerror "const char * restrict format" ...
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.Ft int Fn ebegin "const char * restrict format" ...
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.Ft int Fn einfon "const char * restrict format" ...
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.Ft int Fn ewarnn "const char * restrict format" ...
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.Ft int Fn eerrorn "const char * restrict format" ...
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.Ft int Fn ebeginn "const char * restrict format" ...
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.Ft int Fn einfov "const char * restrict format" ...
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.Ft int Fn ewarnv "const char * restrict format" ...
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.Ft int Fn ebeginv "const char * restrict format" ...
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.Ft int Fn einfovn "const char * restrict format" ...
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.Ft int Fn ewarnvn "const char * restrict format" ...
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.Ft int Fn ebeginvn "const char * restrict format" ...
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.Ft int Fn ewarnx "const char * restrict format" ...
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.Ft int Fn eerrorx "const char * restrict format" ...
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.Ft int Fn eend "int retval" "const char * restrict format" ...
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.Ft int Fn ewend "int retval" "const char * restrict format" ...
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.Ft int Fn eendv "int retval" "const char * restrict format" ...
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.Ft int Fn ewendv "int retval" "const char * restrict format" ...
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.Ft void Fn ebracket "int col" "ECOLOR color" "const char * restrict msg"
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.Ft void Fn eindent void
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.Ft void Fn eoutdent void
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.Ft void Fn eindentv void
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.Ft void Fn eoutdentv void
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.Ft void Fn eprefix "const char * prefix"
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.Sh DESCRIPTION
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The
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.Fn einfo
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family of functions provide a simple informational output that is colorised.
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Basically
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.Fn einfo ,
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.Fn ewarn
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and
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.Fn eerror
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behave exactly like
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.Fn printf
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but prefix the output with a colored *. The function called denotes the color
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used with
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.Fn einfo
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being green,
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.Fn ewarn
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being yellow and
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.Fn eerror
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being red.
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einfo goes to stdout and the others go to stderr.
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The number of real characters printed is returned.
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.Fn ebegin
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is identical to
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.Fn einfo
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except that 3 dots are appended to the output.
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.Pp
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.Fn einfov ,
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.Fn ewarnv
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and
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.Fn ebeginv
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work the same way to
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.Fn einfo ,
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.Fn ewarn ,
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and
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.Fn ebegin
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respectively, but only work when
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.Va EINFO_VERBOSE
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is true. You can also make the
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.Fn einfo ,
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.Fn ewarn ,
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and
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.Fn ebegin
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functions silent by setting
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.Va EINFO_QUIET
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to true.
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.Pp
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These functions are designed to output a whole line, so they also
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append a newline to the string. To stop this behaviour, you can use the
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functions
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.Fn einfon ,
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.Fn ewarnn ,
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.Fn eerrorn ,
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.Fn einfovn ,
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.Fn ewarnvn ,
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and
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.Fn ebeginvn .
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.Pp
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.Fn eend ,
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.Fn ewend ,
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.Fn eendv
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and
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.Fn ewendv
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are the counterparts to the above functions. If
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.Fa retval
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is zero then ok in green is printed in a bracket at the end of the prior
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line. Otherwise we print the formatted string using
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.Fn error
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(or
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.Fn ewarn
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if
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.Fn ewend
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is called) !! in red (or yellow if
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.Fn ewend
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is called) is printed in a bracket at the end of the line.
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The value of
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.Fa retval
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is returned.
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.Pp
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.Fn ebracket
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does the same as
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.Fn eend
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but prints
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.Fa msg
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instead of ok or !! in the color
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.Fa color
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at the column
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.Fa col .
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.Pp
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.Fn eindent
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indents subsequent calls to the above functions by 3 characters.
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.Fn eoutdent
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removes an
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.Fn eindent .
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.Fn eindentv
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and
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.Fn eoutdentv
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only work when
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.Va EINFO_VERBOSE
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is true.
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.Pp
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.Fn eprefix
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prefixes the string
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.Fa prefix
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to the above functions.
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.Sh IMPLEMENTATION NOTES
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einfo can optionally be linked against the
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.Lb libtermcap
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so that we can correctly query the connected console for our color and
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cursor escape codes.
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If not, then we have a hard coded list of terminals we know about that support
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the commonly used codes for color and cursor position.
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.Sh ENVIRONMENT
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.Va EINFO_QUIET
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when set to true makes the
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.Fn einfo
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and
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.Fn einfon
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family of functions quiet, so nothing is printed.
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.Pp
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.Va EINFO_VERBOSE
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when set to true makes the
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.Fn einfov
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and
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.Fn einfovn
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family of functions work, so they do print.
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.Sh FILES
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.Pa /etc/init.d/functions.sh
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is provided by OpenRC, which allows shell scripts to use the above functions.
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For historical reasons our verbose functions are prefixed with v instead of
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suffixed. So einfov becomes veinfo, einfovn becomes veinfon.
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Rinse and repeat for the other verbose functions.
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.Sh SEE ALSO
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.Xr printf 3 ,
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.Sh AUTHORS
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.An Roy Marples <roy@marples.name>
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