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##
##  echo -- Print string with optional construct expansion
##  Copyright (c) 1998-2008 Ralf S. Engelschall <rse@engelschall.com>
##
##  This file is part of shtool and free software; you can redistribute
##  it and/or modify it under the terms of the GNU General Public
##  License as published by the Free Software Foundation; either version
##  2 of the License, or (at your option) any later version.
##
##  This file is distributed in the hope that it will be useful,
##  but WITHOUT ANY WARRANTY; without even the implied warranty of
##  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
##  General Public License for more details.
##
##  You should have received a copy of the GNU General Public License
##  along with this program; if not, write to the Free Software
##  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
##  USA, or contact Ralf S. Engelschall <rse@engelschall.com>.
##

str_tool="echo"
str_usage="[-n|--newline] [-e|--expand] [<string> ...]"
arg_spec="0+"
opt_spec="n.e."
opt_alias="n:newline,e:expand"
opt_n=no
opt_e=no

. ./sh.common

text="$*"

#   check for broken escape sequence expansion
seo=''
bytes=`echo '\1' | wc -c | awk '{ printf("%s", $1); }'`
if [ ".$bytes" != .3 ]; then
    bytes=`echo -E '\1' | wc -c | awk '{ printf("%s", $1); }'`
    if [ ".$bytes" = .3 ]; then
        seo='-E'
    fi
fi

#   check for existing -n option (to suppress newline)
minusn=''
bytes=`echo -n 123 2>/dev/null | wc -c | awk '{ printf("%s", $1); }'`
if [ ".$bytes" = .3 ]; then
    minusn='-n'
fi

#   determine terminal bold sequence
term_bold=''
term_norm=''
if [ ".$opt_e" = .yes ] && [ ".`echo $text | grep '%[Bb]'`" != . ]; then
    case $TERM in
        #   for the most important terminal types we directly know the sequences
        xterm|xterm*|vt220|vt220*)
            term_bold=`awk 'BEGIN { printf("%c%c%c%c", 27, 91, 49, 109); }' </dev/null 2>/dev/null`
            term_norm=`awk 'BEGIN { printf("%c%c%c", 27, 91, 109); }' </dev/null 2>/dev/null`
            ;;
        vt100|vt100*|cygwin)
            term_bold=`awk 'BEGIN { printf("%c%c%c%c%c%c", 27, 91, 49, 109, 0, 0); }' </dev/null 2>/dev/null`
            term_norm=`awk 'BEGIN { printf("%c%c%c%c%c", 27, 91, 109, 0, 0); }' </dev/null 2>/dev/null`
            ;;
        #   for all others, we try to use a possibly existing `tput' or `tcout' utility
        * )
            paths=`echo $PATH | sed -e 's/:/ /g'`
            for tool in tput tcout; do
                for dir in $paths; do
                    if [ -r "$dir/$tool" ]; then
                        for seq in bold md smso; do # 'smso' is last
                            bold="`$dir/$tool $seq 2>/dev/null`"
                            if [ ".$bold" != . ]; then
                                term_bold="$bold"
                                break
                            fi
                        done
                        if [ ".$term_bold" != . ]; then
                            for seq in sgr0 me rmso init reset; do # 'reset' is last
                                norm="`$dir/$tool $seq 2>/dev/null`"
                                if [ ".$norm" != . ]; then
                                    term_norm="$norm"
                                    break
                                fi
                            done
                        fi
                        break
                    fi
                done
                if [ ".$term_bold" != . ] && [ ".$term_norm" != . ]; then
                    break;
                fi
            done
            ;;
    esac
    if [ ".$term_bold" = . ] || [ ".$term_norm" = . ]; then
        echo "$msgprefix:Warning: unable to determine terminal sequence for bold mode" 1>&2
        term_bold=''
        term_norm=''
    fi
fi

#   determine user name
username=''
if [ ".$opt_e" = .yes ] && [ ".`echo $text | grep '%[uUgG]'`" != . ]; then
    username="`(id -un) 2>/dev/null`"
    if [ ".$username" = . ]; then
        str="`(id) 2>/dev/null`"
        if [ ".`echo $str | grep '^uid[ 	]*=[ 	]*[0-9]*('`" != . ]; then
            username=`echo $str | sed -e 's/^uid[ 	]*=[ 	]*[0-9]*(//' -e 's/).*$//'`
        fi
        if [ ".$username" = . ]; then
            username="$LOGNAME"
            if [ ".$username" = . ]; then
                username="$USER"
                if [ ".$username" = . ]; then
                    username="`(whoami) 2>/dev/null |\
                               awk '{ printf("%s", $1); }'`"
                    if [ ".$username" = . ]; then
                        username="`(who am i) 2>/dev/null |\
                                   awk '{ printf("%s", $1); }'`"
                        if [ ".$username" = . ]; then
                            username='unknown'
                        fi
                    fi
                fi
            fi
        fi
    fi
fi

#   determine user id
userid=''
if [ ".$opt_e" = .yes ] && [ ".`echo $text | grep '%U'`" != . ]; then
    userid="`(id -u) 2>/dev/null`"
    if [ ".$userid" = . ]; then
        userid="`(id -u ${username}) 2>/dev/null`"
        if [ ".$userid" = . ]; then
            str="`(id) 2>/dev/null`"
            if [ ".`echo $str | grep '^uid[ 	]*=[ 	]*[0-9]*('`" != . ]; then
                userid=`echo $str | sed -e 's/^uid[ 	]*=[ 	]*//' -e 's/(.*$//'`
            fi
            if [ ".$userid" = . ]; then
                userid=`(getent passwd ${username}) 2>/dev/null | \
                        sed -e 's/[^:]*:[^:]*://' -e 's/:.*$//'`
                if [ ".$userid" = . ]; then
                    userid=`grep "^${username}:" /etc/passwd 2>/dev/null | \
                            sed -e 's/[^:]*:[^:]*://' -e 's/:.*$//'`
                    if [ ".$userid" = . ]; then
                        userid=`(ypmatch "${username}" passwd; nismatch "${username}" passwd) 2>/dev/null | \
                                sed -e 'q' | sed -e 's/[^:]*:[^:]*://' -e 's/:.*$//'`
                        if [ ".$userid" = . ]; then
                            userid=`(nidump passwd . | grep "^${username}:") 2>/dev/null | \
                                    sed -e 's/[^:]*:[^:]*://' -e 's/:.*$//'`
                            if [ ".$userid" = . ]; then
                                userid='?'
                            fi
                        fi
                    fi
                fi
            fi
        fi
    fi
fi

#   determine (primary) group id
groupid=''
if [ ".$opt_e" = .yes ] && [ ".`echo $text | grep '%[gG]'`" != . ]; then
    groupid="`(id -g ${username}) 2>/dev/null`"
    if [ ".$groupid" = . ]; then
        str="`(id) 2>/dev/null`"
        if [ ".`echo $str | grep 'gid[ 	]*=[ 	]*[0-9]*('`" != . ]; then
            groupid=`echo $str | sed -e 's/^.*gid[ 	]*=[ 	]*//' -e 's/(.*$//'`
        fi
        if [ ".$groupid" = . ]; then
            groupid=`(getent passwd ${username}) 2>/dev/null | \
                     sed -e 's/[^:]*:[^:]*:[^:]*://' -e 's/:.*$//'`
            if [ ".$groupid" = . ]; then
                groupid=`grep "^${username}:" /etc/passwd 2>/dev/null | \
                         sed -e 's/[^:]*:[^:]*:[^:]*://' -e 's/:.*$//'`
                if [ ".$groupid" = . ]; then
                    groupid=`(ypmatch "${username}" passwd; nismatch "${username}" passwd) 2>/dev/null | \
                             sed -e 'q' | sed -e 's/[^:]*:[^:]*:[^:]*://' -e 's/:.*$//'`
                    if [ ".$groupid" = . ]; then
                        groupid=`(nidump passwd . | grep "^${username}:") 2>/dev/null | \
                                 sed -e 's/[^:]*:[^:]*:[^:]*://' -e 's/:.*$//'`
                        if [ ".$groupid" = . ]; then
                            groupid='?'
                        fi
                    fi
                fi
            fi
        fi
    fi
fi

#   determine (primary) group name
groupname=''
if [ ".$opt_e" = .yes ] && [ ".`echo $text | grep '%g'`" != . ]; then
    groupname="`(id -gn ${username}) 2>/dev/null`"
    if [ ".$groupname" = . ]; then
        str="`(id) 2>/dev/null`"
        if [ ".`echo $str | grep 'gid[ 	]*=[ 	]*[0-9]*('`" != . ]; then
            groupname=`echo $str | sed -e 's/^.*gid[ 	]*=[ 	]*[0-9]*(//' -e 's/).*$//'`
        fi
        if [ ".$groupname" = . ]; then
            groupname=`(getent group) 2>/dev/null | \
                       grep "^[^:]*:[^:]*:${groupid}:" | \
                       sed -e 's/:.*$//'`
            if [ ".$groupname" = . ]; then
                groupname=`grep "^[^:]*:[^:]*:${groupid}:" /etc/group 2>/dev/null | \
                           sed -e 's/:.*$//'`
                if [ ".$groupname" = . ]; then
                    groupname=`(ypcat group; niscat group) 2>/dev/null | \
                               sed -e 'q' | grep "^[^:]*:[^:]*:${groupid}:" | \
                               sed -e 's/:.*$//'`
                    if [ ".$groupname" = . ]; then
                        groupname=`(nidump group .) 2>/dev/null | \
                                   grep "^[^:]*:[^:]*:${groupid}:" | \
                                   sed -e 's/:.*$//'`
                        if [ ".$groupname" = . ]; then
                            groupname='?'
                        fi
                    fi
                fi
            fi
        fi
    fi
fi

#   determine host and domain name
hostname=''
domainname=''
if [ ".$opt_e" = .yes ] && [ ".`echo $text | grep '%h'`" != . ]; then
    hostname="`(uname -n) 2>/dev/null |\
               awk '{ printf("%s", $1); }'`"
    if [ ".$hostname" = . ]; then
        hostname="`(hostname) 2>/dev/null |\
                   awk '{ printf("%s", $1); }'`"
        if [ ".$hostname" = . ]; then
            hostname='unknown'
        fi
    fi
    case $hostname in
        *.* )
            domainname=".`echo $hostname | cut -d. -f2-`"
            hostname="`echo $hostname | cut -d. -f1`"
            ;;
    esac
fi
if [ ".$opt_e" = .yes ] && [ ".`echo $text | grep '%d'`" != . ]; then
    if [ ".$domainname" = . ]; then
        if [ -f /etc/resolv.conf ]; then
            domainname="`grep '^[ 	]*domain' /etc/resolv.conf | sed -e 'q' |\
                         sed -e 's/.*domain//' \
                             -e 's/^[ 	]*//' -e 's/^ *//' -e 's/^	*//' \
                             -e 's/^\.//' -e 's/^/./' |\
                         awk '{ printf("%s", $1); }'`"
            if [ ".$domainname" = . ]; then
                domainname="`grep '^[ 	]*search' /etc/resolv.conf | sed -e 'q' |\
                             sed -e 's/.*search//' \
                                 -e 's/^[ 	]*//' -e 's/^ *//' -e 's/^	*//' \
                                 -e 's/ .*//' -e 's/	.*//' \
                                 -e 's/^\.//' -e 's/^/./' |\
                             awk '{ printf("%s", $1); }'`"
            fi
        fi
    fi
fi

#   determine current time
time_day=''
time_month=''
time_year=''
time_monthname=''
if [ ".$opt_e" = .yes ] && [ ".`echo $text | grep '%[DMYm]'`" != . ]; then
    time_day=`date '+%d'`
    time_month=`date '+%m'`
    time_year=`date '+%Y' 2>/dev/null`
    if [ ".$time_year" = . ]; then
        time_year=`date '+%y'`
        case $time_year in
            [5-9][0-9]) time_year="19$time_year" ;;
            [0-4][0-9]) time_year="20$time_year" ;;
        esac
    fi
    case $time_month in
        1|01) time_monthname='Jan' ;;
        2|02) time_monthname='Feb' ;;
        3|03) time_monthname='Mar' ;;
        4|04) time_monthname='Apr' ;;
        5|05) time_monthname='May' ;;
        6|06) time_monthname='Jun' ;;
        7|07) time_monthname='Jul' ;;
        8|08) time_monthname='Aug' ;;
        9|09) time_monthname='Sep' ;;
          10) time_monthname='Oct' ;;
          11) time_monthname='Nov' ;;
          12) time_monthname='Dec' ;;
    esac
fi

#   expand special ``%x'' constructs
if [ ".$opt_e" = .yes ]; then
    text=`echo $seo "$text" |\
          sed -e "s/%B/${term_bold}/g" \
              -e "s/%b/${term_norm}/g" \
              -e "s/%u/${username}/g" \
              -e "s/%U/${userid}/g" \
              -e "s/%g/${groupname}/g" \
              -e "s/%G/${groupid}/g" \
              -e "s/%h/${hostname}/g" \
              -e "s/%d/${domainname}/g" \
              -e "s/%D/${time_day}/g" \
              -e "s/%M/${time_month}/g" \
              -e "s/%Y/${time_year}/g" \
              -e "s/%m/${time_monthname}/g" 2>/dev/null`
fi

#   create output
if [ .$opt_n = .no ]; then
    echo $seo "$text"
else
    #   the harder part: echo -n is best, because
    #   awk may complain about some \xx sequences.
    if [ ".$minusn" != . ]; then
        echo $seo $minusn "$text"
    else
        echo dummy | awk '{ printf("%s", TEXT); }' TEXT="$text"
    fi
fi

shtool_exit 0

##
##  manual page
##

=pod

=head1 NAME

B<shtool-echo> - B<GNU shtool> echo(1) extensional command

=head1 SYNOPSIS

B<shtool echo>
[B<-n>|B<--newline>]
[B<-e>|B<--expand>]
I<string>

=head1 DESCRIPTION

B<shtool echo> is an echo(1) style command which prints I<string> to
F<stdout> and optionally provides special expansion constructs (terminal
bold mode, environment details, date, etc) and newline control. The
trick of this command is that it provides a portable B<-n> option and
hides the gory details needed to find out the environment details under
option B<-e>.

=head1 OPTIONS

The following command line options are available.

=over 4

=item B<-n>, B<--newline>

By default, output is written to F<stdout> followed by a "newline"
(ASCII character 0x0a). If option B<-n> is used, this newline character
is omitted.

=item B<-e>, B<--expand>

If option B<-e> is used, I<string> can contain special "B<%>I<x>"
constructs which are expanded before the output is written. Currently
the following constructs are recognized:

=over 4

=item B<%B>

switch terminal mode to bold display mode.

=item B<%b>

switch terminal mode back to normal display mode.

=item B<%u>

the current user name.

=item B<%U>

the current user id (numerical).

=item B<%g>

the current group name.

=item B<%G>

the current group id (numerical).

=item B<%h>

the current hostname (without any domain extension).

=item B<%d>

the current domain name.

=item B<%D>

the current day of the month.

=item B<%M>

the current month (numerical).

=item B<%m>

the current month name.

=item B<%Y>

the current year.

=back

=back

=head1 EXAMPLE

 #   shell script
 shtool echo -n -e "Enter your name [%B%u%b]: "; read name
 shtool echo -e "Your Email address might be %u@%h%d"
 shtool echo -e "The current date is %D-%m-%Y"

=head1 HISTORY

The B<GNU shtool> B<echo> command was originally written by Ralf S.
Engelschall E<lt>rse@engelschall.comE<gt> in 1998 for I<Website META
Language> (WML) under the name B<buildinfo>. It was later taken over
into B<GNU shtool>.

=head1 SEE ALSO

shtool(1), echo(1).

=cut


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