tangetools/T/T

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2017-04-08 20:24:07 +00:00
#!/bin/bash
: <<=cut
=encoding utf8
=head1 NAME
T - make temporary files
=head1 SYNOPSIS
B<T> [I<-#>] [I<filename>]
=head1 DESCRIPTION
B<T> can be used in 3 ways.
=head2 End of a pipe - save to file
If placed last in a pipe B<T> will take standard output from a command
and save it in a temporary file.
Equivalent to: B<cat> >B<tempfile>
=head3 Example
cat file | T
=head2 Start of a pipe - type the file
If placed first in a pipe B<T> will type the last temporary file's
contents to standard output.
Equivalent to: B<cat tempfile>
=head3 Example
T | cat
=head2 In the middle of a pipe - save and type the file
If placed in the middle of a pipe B<T> will copy standard output from
a command and save it in a temporary file and pass the standard output
on.
Equivalent to: B<tee tempfile>
=head3 Example
cat | T | cat
=head2 Relative .tmp dir
B<T> will use B<$HOME/.tmp> if it cannot find a dir called B<.tmp> in
any of the (grand*)parent dirs.
=head1 OPTIONS
=over 9
=item I<filename>
If given a filename B<T> saves info to that file in the .tmp-directory
instead of tempfile
=item -#
If given option -# which # is a number T will use the #'th last
version.
=back
=head1 FILES
=over 5
=item .tmp/tempfile or .tmp/I<filename>
the most recent temporary file created
=item .tmp/I<filename>-I<YYYY-MM-DD.hh:mm:ss-pid>
the temporary file created at I<YYYY-MM-DD hh:mm:ss> with process id I<pid>
=back
=head1 AUTHOR
Copyright (C) 2017 Ole Tange,
http://ole.tange.dk and Free Software Foundation, Inc.
=head1 LICENSE
Copyright (C) 2012 Free Software Foundation, Inc.
This program is 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 3 of the License, or
at your option any later version.
This program 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, see <http://www.gnu.org/licenses/>.
=head1 SEE ALSO
B<tee>(1), B<cat>(1)
=cut
find_tmp_dir() {
dir="$1"
if [ -d "$1"/.tmp ] ; then
echo "$1"/.tmp
return 0
else
if [ "/" == $(readlink -f "$dir") ]; then
echo $HOME/.tmp
return 0
fi
find_tmp_dir "../$dir"
return $?
fi
}
tmpdir="$(find_tmp_dir .)"
mkdir -p "$tmpdir"
T_DIR="$tmpdir"
#DEBUG_LOG=/tmp/T-debug
DEBUG_LOG=/dev/null
if echo $1 | egrep '^-[0-9]+$' >/dev/null; then
T_BACK_NO=$(echo $1 | sed -e 's:-::')
shift
if [ -z "$1" ]; then
# No filename given. Default = tempfile
T_NO_SLASH=tempfile
else
# Map / to __ to avoid creating dirs in ~/.tmp
T_NO_SLASH=$(echo $1 | sed -e 's:/:__:g')
fi
T_TEMPFIL=$T_DIR/$T_NO_SLASH
T_BACK_FILENAME=$(find $T_DIR -name "$T_NO_SLASH"-'[0-9][0-9][0-9][0-9]-[0-9][0-9]-[0-9][0-9].[0-9][0-9]:[0-9][0-9]:[0-9][0-9]-[0-9]*' \
| sort | tail -n $T_BACK_NO | head -n 1)
if [ -z "$T_BACK_FILENAME" ]; then
T_TEMPFIL=$T_DIR/$T_NO_SLASH
else
T_TEMPFIL=$T_BACK_FILENAME
fi
else
if [ -z "$1" ]; then
# No filename given. Default = tempfile
T_TEMPFIL=$T_DIR/tempfile
else
# Map / to __ to avoid creating dirs in ~/.tmp
T_NO_SLASH=$(echo $1 | sed -e 's:/:__:g')
T_TEMPFIL=$T_DIR/$T_NO_SLASH
fi
fi
T_NY_FIL="$T_TEMPFIL"-`date +"%Y-%m-%d.%H:%M:%S"`-$$
mkdir $T_DIR 2>/dev/null
if tty -s ; then
# STDIN is terminal
# Don't care what STDOUT is
# T | cat => T= cat file
# T => T= cat file
echo cat "$T_TEMPFIL" >> $DEBUG_LOG
cat "$T_TEMPFIL"
else
# STDIN redir'ed
if [ -t 1 ] ; then
# STDOUT = terminal
# cat | T => T= >file
echo cat '>' "$T_NY_FIL" >> $DEBUG_LOG
cat > "$T_NY_FIL"
else
# STDOUT redir'ed
# cat | T | cat => T= tee file
echo tee "$T_NY_FIL" >> $DEBUG_LOG
tee "$T_NY_FIL"
fi
# Remove hardlink to most recent file
rm "$T_TEMPFIL" 2> /dev/null
# make a hardlink to the most recent file
ln "$T_NY_FIL" "$T_TEMPFIL"
fi