68 lines
2.3 KiB
Awk
68 lines
2.3 KiB
Awk
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# inplace --- load and invoke the inplace extension.
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#
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# Copyright (C) 2013, 2017, 2019 the Free Software Foundation, Inc.
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#
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# This file is part of GAWK, the GNU implementation of the
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# AWK Programming Language.
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#
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# GAWK is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# GAWK is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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#
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# Andrew J. Schorr, aschorr@telemetry-investments.com
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# January 2013
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#
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# Revised for namespaces
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# Arnold Robbins, arnold@skeeve.com
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# July 2017
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# June 2019, add backwards compatibility
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@load "inplace"
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# Please set inplace::suffix to make a backup copy. For example, you may
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# want to set inplace::suffix to .bak on the command line or in a BEGIN rule.
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# Before there were namespaces in gawk, this extension used
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# INPLACE_SUFFIX as the variable for making backup copies. We allow this
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# too, so that any code that used the previous version continues to work.
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# By default, each filename on the command line will be edited inplace.
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# But you can selectively disable this by adding an inplace::enable=0 argument
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# prior to files that you do not want to process this way. You can then
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# reenable it later on the commandline by putting inplace::enable=1 before files
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# that you wish to be subject to inplace editing.
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# N.B. We call inplace::end() in the BEGINFILE and END rules so that any
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# actions in an ENDFILE rule will be redirected as expected.
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@namespace "inplace"
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BEGIN {
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enable = 1 # enabled by default
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}
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BEGINFILE {
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sfx = (suffix ? suffix : awk::INPLACE_SUFFIX)
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if (filename != "")
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end(filename, sfx)
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if (enable)
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begin(filename = FILENAME, sfx)
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else
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filename = ""
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}
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END {
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if (filename != "")
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end(filename, (suffix ? suffix : awk::INPLACE_SUFFIX))
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}
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