Add Makefile for easy installation

Makefile

@@ -0,0 +1,63 @@
+#
+# GIT-ARCHIVE-ALL
+#
+# Copyright (c) 2019 Timo Röhling
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+# SOFTWARE.
+#
+ifneq ($(PREFIX),)
+prefix ?= $(PREFIX)
+endif
+ifneq ($(DESTDIR),)
+prefix ?= /usr
+endif
+ifneq ($(shell id -u),0)
+prefix ?= $(HOME)/.local
+else
+prefix ?= /usr/local
+endif
+
+bindir ?= bin
+mandir ?= share/man/man1
+
+help:
+	@echo
+	@echo "* Run 'make install' to install the script to $(prefix)/$(bindir)"
+	@echo "* Run 'make uninstall' to uninstall the script again."
+	@echo "* You can pick a different install prefix than $(prefix) with"
+	@echo "  make prefix=/other/prefix install"
+	@echo
+
+install: $(DESTDIR)$(prefix)/$(bindir)/git-archive-all $(DESTDIR)$(prefix)/$(mandir)/git-archive-all.1.gz
+
+uninstall:
+	rm $(DESTDIR)$(prefix)/$(bindir)/git-archive-all
+	rm -f $(DESTDIR)$(prefix)/$(mandir)/git-archive-all.1.gz
+
+$(DESTDIR)$(prefix)/$(bindir)/git-archive-all: git-archive-all $(DESTDIR)$(prefix)/$(bindir)
+	install -m755 $< $(DESTDIR)$(prefix)/$(bindir)
+
+$(DESTDIR)$(prefix)/$(mandir)/git-archive-all.1.gz: git-archive-all $(DESTDIR)$(prefix)/$(mandir)
+	pod2man -r "" -c "Git Manual" $< > $(basename $@) && gzip -9fn $(basename $@)
+
+$(DESTDIR)$(prefix)/$(bindir) $(DESTDIR)$(prefix)/$(mandir):
+	mkdir -p $@
+
+.PHONY: install uninstall
+