11 files changed, 480 insertions, 0 deletions
diff --git a/build-aux/Makefile.each.head/00-dist.mk b/build-aux/Makefile.each.head/00-dist.mk
new file mode 100644
index 0000000..a094305
--- /dev/null
+++ b/build-aux/Makefile.each.head/00-dist.mk
@@ -0,0 +1,20 @@
+# Copyright (C) 2015-2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+ifeq ($(outdir),$(topoutdir))
+std.clean_files += $(addprefix $(dist.pkgname)-*,$(dist.exts) .tar /)
+endif
+
+$(outdir)/dist: $(addprefix $(topoutdir)/$(dist.pkgname)-$(dist.version),$(dist.exts))
diff --git a/build-aux/Makefile.each.tail/10-std.mk b/build-aux/Makefile.each.tail/10-std.mk
new file mode 100644
index 0000000..693f39d
--- /dev/null
+++ b/build-aux/Makefile.each.tail/10-std.mk
@@ -0,0 +1,53 @@
+# Copyright (C) 2015-2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Add some more defaults to the *_files variables
+std.clean_files += $(std.gen_files) $(std.cfg_files) $(std.out_files)
+
+# Fix each variable at its current value to avoid any weirdness
+$(foreach c,src gen cfg out sys clean slow,$(eval std.$c_files := $$(std.$c_files)))
+
+# Make each of the standard variables relative to the correct directory
+std.src_files   := $(patsubst ./%,%,$(addprefix $(srcdir)/,$(std.src_files)))
+std.gen_files   := $(patsubst ./%,%,$(addprefix $(srcdir)/,$(std.gen_files)))
+std.cfg_files   := $(patsubst ./%,%,$(addprefix $(outdir)/,$(std.cfg_files)))
+std.out_files   := $(patsubst ./%,%,$(addprefix $(outdir)/,$(std.out_files)))
+std.sys_files   :=                  $(addprefix $(DESTDIR),$(std.sys_files))
+std.clean_files := $(patsubst ./%,%,$(addprefix $(outdir)/,$(std.clean_files)))
+std.slow_files  := $(patsubst ./%,%,$(addprefix $(outdir)/,$(std.slow_files)))
+
+# Creative targets
+$(outdir)/build      :        $(std.out_files)
+$(outdir)/install    :        $(std.sys_files)
+$(outdir)/installdirs: $(sort $(dir $(std.sys_files)))
+
+# Destructive targets
+_std.uninstall/$(outdir)        := $(std.sys_files)
+_std.mostlyclean/$(outdir)      := $(filter-out $(std.slow_files) $(std.cfg_files) $(std.gen_files) $(std.src_files),$(std.clean_files))
+_std.clean/$(outdir)            := $(filter-out                   $(std.cfg_files) $(std.gen_files) $(std.src_files),$(std.clean_files))
+_std.distclean/$(outdir)        := $(filter-out                                    $(std.gen_files) $(std.src_files),$(std.clean_files))
+_std.maintainer-clean/$(outdir) := $(filter-out                                                     $(std.src_files),$(std.clean_files))
+$(addprefix $(outdir)/,mostlyclean clean distclean maintainer-clean): %: %-hook
+	$(RM)    -- $(sort $(filter-out %/,$(_std.$(@F)/$(@D))))
+	$(RM) -r -- $(sort $(filter     %/,$(_std.$(@F)/$(@D))))
+	$(RMDIR_P) $(sort $(dir $(_std.$(@F)/$(@D)))) 2>/dev/null || $(TRUE)
+# separate uninstall to support GNU Coding Standards' NORMAL_UNINSTALL
+$(addprefix $(outdir)/,uninstall): %: %-hook
+	$(NORMAL_UNINSTALL)
+	$(RM)    -- $(sort $(filter-out %/,$(_std.$(@F)/$(@D))))
+	$(RM) -r -- $(sort $(filter     %/,$(_std.$(@F)/$(@D))))
+	$(RMDIR_P) $(sort $(dir $(_std.$(@F)/$(@D)))) 2>/dev/null || $(TRUE)
+$(foreach t,uninstall mostlyclean clean distclean maintainer-clean, $(outdir)/$t-hook)::
+.PHONY: $(foreach t,uninstall mostlyclean clean distclean maintainer-clean, $(outdir)/$t-hook)
diff --git a/build-aux/Makefile.each.tail/11-gnustuff.mk b/build-aux/Makefile.each.tail/11-gnustuff.mk
new file mode 100644
index 0000000..790efad
--- /dev/null
+++ b/build-aux/Makefile.each.tail/11-gnustuff.mk
@@ -0,0 +1,60 @@
+# Copyright (C) 2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# 7.2.6: Standard Targets for Users
+# ---------------------------------
+
+std.gen_files += $(foreach f,$(gnustuff.info_docs),            $f.info )
+std.sys_files += $(foreach f,$(gnustuff.info_docs), $(infodir)/$f.info )
+
+$(foreach d,$(gnustuff.program_dirs),$(eval $(call _gnustuff.install_program,$d)))
+$(foreach d,$(gnustuff.data_dirs)   ,$(eval $(call _gnustuff.install_data,$d)))
+
+#all: std
+install:
+	$(foreach f,$(gnustuff.info_docs),$(INSTALL_INFO) $(DESTDIR)$(infodir)/$f.info $(DESTDIR)$(infodir)/dir$(at.nl))
+$(outdir)/install-html: $(foreach f,$(gnustuff.info_docs), $(DESTDIR)$(htmldir)/$f.html )
+$(outdir)/install-dvi : $(foreach f,$(gnustuff.info_docs), $(DESTDIR)$(dvidir)/$f.dvi  )
+$(outdir)/install-pdf : $(foreach f,$(gnustuff.info_docs), $(DESTDIR)$(pdfdir)/$f.pdf  )
+$(outdir)/install-ps  : $(foreach f,$(gnustuff.info_docs), $(DESTDIR)$(psdir)/$f.ps   )
+#uninstall: std
+$(outdir)/install-strip: install
+	$(STRIP) $(filter $(addsuffix /%,$(gnustuff.program_dirs)),$(std.sys_files/$(@D)))
+#clean: std
+#distclean: std
+#mostlyclean: std
+#maintainer-clean: std
+TAGS: TODO
+$(outdir)/info: $(addsuffix .info,$(gnustuff.info_docs))
+$(outdir)/dvi : $(addsuffix .dvi ,$(gnustuff.info_docs))
+$(outdir)/html: $(addsuffix .html,$(gnustuff.info_docs))
+$(outdir)/pdf : $(addsuffix .pdf ,$(gnustuff.info_docs))
+$(outdir)/ps  : $(addsuffix .ps  ,$(gnustuff.info_docs))
+#dist:dist
+check: TODO
+installcheck: TODO
+#installdirs: std
+
+$(outdir)/%.info: $(srcdir)/%.texi; $(MAKEINFO)  -o $(@D) $<
+$(outdir)/%.info: $(outdir)/%.texi; $(MAKEINFO)  -o $(@D) $<
+$(outdir)/%.dvi : $(srcdir)/%.texi; $(TEXI2DVI)  -o $(@D) $<
+$(outdir)/%.dvi : $(outdir)/%.texi; $(TEXI2DVI)  -o $(@D) $<
+$(outdir)/%.html: $(srcdir)/%.texi; $(TEXI2HTML) -o $(@D) $<
+$(outdir)/%.html: $(outdir)/%.texi; $(TEXI2HTML) -o $(@D) $<
+$(outdir)/%.pdf : $(srcdir)/%.texi; $(TEXI2PDF)  -o $(@D) $<
+$(outdir)/%.pdf : $(outdir)/%.texi; $(TEXI2PDF)  -o $(@D) $<
+$(outdir)/%.ps  : $(srcdir)/%.texi; $(TEXI2PS)   -o $(@D) $<
+$(outdir)/%.ps  : $(outdir)/%.texi; $(TEXI2PS)   -o $(@D) $<
+#installdirs: std
diff --git a/build-aux/Makefile.once.head/00-dist.mk b/build-aux/Makefile.once.head/00-dist.mk
new file mode 100644
index 0000000..d5bfcd3
--- /dev/null
+++ b/build-aux/Makefile.once.head/00-dist.mk
@@ -0,0 +1,44 @@
+# Copyright (C) 2015-2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Developer configuration
+
+dist.exts ?= .tar.gz
+dist.pkgname ?= $(PACKAGE)
+dist.version ?= $(VERSION)
+
+ifeq ($(dist.pkgname),)
+$(error dist.pkgname must be set)
+endif
+ifeq ($(dist.version),)
+$(error dist.version must be set)
+endif
+
+# User configuration
+
+CP      ?= cp
+GZIP    ?= gzip
+MKDIR   ?= mkdir
+MKDIR_P ?= mkdir -p
+MV      ?= mv
+RM      ?= rm -f
+TAR     ?= tar
+
+GZIPFLAGS ?= $(GZIP_ENV)
+GZIP_ENV ?= --best
+
+# Implementation
+
+at.phony += dist
diff --git a/build-aux/Makefile.once.head/00-gnuconf.mk b/build-aux/Makefile.once.head/00-gnuconf.mk
new file mode 100644
index 0000000..83cb110
--- /dev/null
+++ b/build-aux/Makefile.once.head/00-gnuconf.mk
@@ -0,0 +1,160 @@
+# Copyright (C) 2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This file is based on §7.2 "Makefile Conventions" of the release of
+# the GNU Coding Standards dated April 13, 2016.
+
+gnuconf.pkgname ?= $(firstword $(PACKAGE_TARNAME) $(PACKAGE) $(PACKAGE_NAME))
+ifeq ($(gnuconf.pkgname),)
+$(error gnuconf.pkgname must be set)
+endif
+
+# 7.2.2: Utilities in Makefiles
+# -----------------------------
+
+# It's ok to hard-code these commands in rules, but who wants to
+# memorize the list of what's ok?
+AWK ?= awk
+CAT ?= cat
+CMP ?= cmp
+CP ?= cp
+DIFF ?= diff
+ECHO ?= echo
+EGREP ?= egrep
+EXPR ?= expr
+FALSE ?= false
+GREP ?= grep
+INSTALL_INFO ?= install-info
+LN ?= ln
+LS ?= ls
+MKDIR ?= mkdir
+MV ?= mv
+PRINTF ?= printf
+PWD ?= pwd
+RM ?= rm
+RMDIR ?= rmdir
+SED ?= sed
+SLEEP ?= sleep
+SORT ?= sort
+TAR ?= tar
+TEST ?= test
+TOUCH ?= touch
+TR ?= tr
+TRUE ?= true
+
+# These must be user-configurable
+AR ?= ar
+ARFLAGS ?=
+BISON ?= bison
+BISONFLAGS ?=
+CC ?= cc
+CCFLAGS ?= $(CFLAGS)
+FLEX ?= flex
+FLEXFLAGS ?=
+INSTALL ?= install
+#INSTALLFLAGS ?=
+LD ?= ld
+LDFLAGS ?=
+LDCONFIG ?= ldconfig #TODO
+LDCONFIGFLAGS ?=
+LEX ?= lex
+LEXFLAGS ?= $(LFLAGS)
+#MAKE
+MAKEINFO ?= makeinfo
+MAKEINFOFLAGS ?=
+RANLIB ?= ranlib #TODO
+RANLIBFLAGS ?=
+TEXI2DVI ?= texi2dvi
+TEXI2DVIFLAGS ?=
+YACC ?= yacc
+YACCFLAGS ?= $(YFLAGS)
+
+CFLAGS ?=
+LFLAGS ?=
+YFLAGS ?=
+
+LN_S ?= ln -s #TODO
+
+CHGRP ?= chgrp
+CHMOD ?= chmod
+CHOWN ?= chown
+MKNOD ?= mknod
+
+# 7.2.3: Variables for Specifying Commands
+# ----------------------------------------
+
+INSTALL_PROGRAM ?= $(INSTALL)
+INSTALL_DATA ?= ${INSTALL} -m 644
+
+# 7.2.5: Variables for Installation Directories
+# ---------------------------------------------
+
+# Root for the installation
+prefix ?= /usr/local
+exec_prefix ?= $(prefix)
+# Executable programs
+bindir     ?= $(exec_prefix)/bin
+sbindir    ?= $(exec_prefix)/sbin
+libexecdir ?= $(exec_prefix)/libexec
+# Data files
+datarootdir    ?= $(prefix)/share
+datadir        ?= $(datarootdir)
+sysconfdir     ?= $(prefix)/etc
+sharedstatedir ?= $(prefix)/com
+localstatedir  ?= $(prefix)/var
+runstatedir    ?= $(localstatedir)/run
+# Specific types of files
+includedir ?= $(prefix)/include
+oldincludedir ?= /usr/include
+docdir ?= $(datarootdir)/doc/$(gnuconf.pkgname)
+infodir ?= $(datarootdir)/info
+htmldir ?= $(docdir)
+dvidir  ?= $(docdir)
+pdfdir  ?= $(docdir)
+psdir   ?= $(docdir)
+libdir ?= $(exec_prefix)/lib
+lispdir ?= $(datarootdir)/emacs/site-lisp
+localedir ?= $(datarootdir)/locale
+
+mandir ?= $(datarootdir)/man
+man1dir ?= $(mandir)/man1
+man2dir ?= $(mandir)/man2
+man3dir ?= $(mandir)/man3
+man4dir ?= $(mandir)/man4
+man5dir ?= $(mandir)/man5
+man6dir ?= $(mandir)/man6
+man7dir ?= $(mandir)/man7
+man8dir ?= $(mandir)/man8
+
+manext ?= .1
+man1ext ?= .1
+man2ext ?= .2
+man3ext ?= .3
+man4ext ?= .4
+man5ext ?= .5
+man6ext ?= .6
+man7ext ?= .7
+man8ext ?= .8
+
+# 7.2.7: Install Command Categories
+# ---------------------------------
+
+PRE_INSTALL ?=
+POST_INSTALL ?=
+NORMAL_INSTALL ?=
+
+PRE_UNINSTALL ?=
+POST_UNINSTALL ?=
+NORMAL_UNINSTALL ?=
diff --git a/build-aux/Makefile.once.head/00-write-ifchanged.mk b/build-aux/Makefile.once.head/00-write-ifchanged.mk
new file mode 100644
index 0000000..79ef1c4
--- /dev/null
+++ b/build-aux/Makefile.once.head/00-write-ifchanged.mk
@@ -0,0 +1 @@
+WRITE_IFCHANGED = $(topsrcdir)/build-aux/write-ifchanged
diff --git a/build-aux/Makefile.once.head/10-std.mk b/build-aux/Makefile.once.head/10-std.mk
new file mode 100644
index 0000000..3e058ec
--- /dev/null
+++ b/build-aux/Makefile.once.head/10-std.mk
@@ -0,0 +1,39 @@
+# Copyright (C) 2015-2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# Declare the default target
+all: build
+.PHONY: all noop
+
+# Standard creative PHONY targets
+at.phony += build install installdirs
+# Standard destructive PHONY targets
+at.phony += uninstall mostlyclean clean distclean maintainer-clean
+
+at.dirlocal += std.src_files
+at.dirlocal += std.gen_files
+at.dirlocal += std.cfg_files
+at.dirlocal += std.out_files
+at.dirlocal += std.sys_files
+at.dirlocal += std.clean_files
+at.dirlocal += std.slow_files
+
+# User configuration
+
+DESTDIR ?=
+
+RM      ?= rm -f
+RMDIR_P ?= rmdir -p
+TRUE    ?= true
diff --git a/build-aux/Makefile.once.head/11-gnustuff.mk b/build-aux/Makefile.once.head/11-gnustuff.mk
new file mode 100644
index 0000000..800f6d2
--- /dev/null
+++ b/build-aux/Makefile.once.head/11-gnustuff.mk
@@ -0,0 +1,34 @@
+# Copyright (C) 2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+STRIP ?= strip
+TEXI2HTML ?= makeinfo --html
+TEXI2PDF ?= texi2pdf
+TEXI2PS ?= texi2dvi --ps
+MKDIR_P ?= mkdir -p
+
+gnustuff.program_dirs += $(bindir) $(sbindir) $(libexecdir)
+gnustuff.data_dirs += $(datarootdir) $(datadir) $(sysconfdir) $(sharedstatedir) $(localstatedir) $(runstatedir)
+gnustuff.data_dirs += $(includedir) $(oldincludedir) $(docdir) $(infodir) $(htmldir) $(dvidir) $(pdfdir) $(psdir) $(libdir) $(lispdir) $(localedir)
+gnustuff.data_dirs += $(mandir) $(man1dir) $(man2dir) $(man3dir) $(man4dir) $(man5dir) $(man6dir) $(man7dir) $(man8dir)
+
+gnustuff.info_docs ?=
+std.dirlocal += gnustuff.info_docs
+
+gnustuff.dirs += $(gnu.program_dirs) $(gnu.data_dirs)
+
+at.phony += install-html install-dvi install-pdf install-ps
+at.phony += info html dvi pdf ps
+at.phony += install-strip
diff --git a/build-aux/Makefile.once.tail/00-dist.mk b/build-aux/Makefile.once.tail/00-dist.mk
new file mode 100644
index 0000000..b8b7733
--- /dev/null
+++ b/build-aux/Makefile.once.tail/00-dist.mk
@@ -0,0 +1,27 @@
+# Copyright (C) 2015-2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+_dist.copyfile = $(MKDIR_P) $(dir $2) && $(CP) -T $1 $2
+_dist.addfile = $(call _dist.copyfile,$3,$2/$(call at.relto,$1,$3))
+$(topoutdir)/$(dist.pkgname)-$(dist.version): $(foreach v,$(filter std.src_files/% std.gen_files/%,$(.VARIABLES)),$($v))
+	$(RM) -r $@ $(@D)/tmp.$(@F)
+	$(MKDIR) $(@D)/tmp.$(@F)
+	$(foreach f,$^,$(call _dist.addfile,$(topsrcdir),$(@D)/tmp.$(@F),$f)$(at.nl))
+	$(MV) $(@D)/tmp.$(@F) $@ || $(RM) -r $(@D)/tmp.$(@F)
+
+$(topoutdir)/$(dist.pkgname)-$(dist.version).tar: $(topoutdir)/$(dist.pkgname)-$(dist.version)
+	$(TAR) cf $@ -C $(<D) $(<F)
+$(topoutdir)/$(dist.pkgname)-$(dist.version).tar.gz: $(topoutdir)/$(dist.pkgname)-$(dist.version).tar
+	$(GZIP) $(GZIPFLAGS) < $< > $@
diff --git a/build-aux/Makefile.once.tail/11-gnustuff.mk b/build-aux/Makefile.once.tail/11-gnustuff.mk
new file mode 100644
index 0000000..df5f192
--- /dev/null
+++ b/build-aux/Makefile.once.tail/11-gnustuff.mk
@@ -0,0 +1,17 @@
+# Copyright (C) 2016  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+$(gnu.dirs):
+	$(MKDIR_P) $@
diff --git a/build-aux/write-ifchanged b/build-aux/write-ifchanged
new file mode 100755
index 0000000..185ceb0
--- /dev/null
+++ b/build-aux/write-ifchanged
@@ -0,0 +1,25 @@
+#!/usr/bin/env bash
+# Copyright (C) 2015  Luke Shumaker
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+outfile=$1
+tmpfile="$(dirname "$outfile")/.tmp${outfile##*/}"
+
+cat > "$tmpfile" || exit $?
+if cmp -s "$tmpfile" "$outfile"; then
+        rm -f "$tmpfile" || :
+else
+        mv -f "$tmpfile" "$outfile"
+fi