Add docker-compose completion script

Makefile

@@ -1,13 +1,62 @@
-.PHONY: backup-zplug
-backup-zplug: \
-	zsh/zplug-$(shell date "+%Y-%m-%d").tar.bz2
+.SILENT:
+
+#
+# Default tasks
+#
+
+install:
+	make $(DEP_PATHS)
+
+update:
+	make $(foreach path,$(DEP_PATHS),$(shell echo "update_$(path)"))
+
+clean:
+	make $(foreach path,$(DEP_PATHS),$(shell echo "remove_$(path)"))
+
+#
+# Backups
+#
+
+.PHONY: backup
+backup: backup-tmux-plugins backup-zplug
 
 .PHONY: backup-tmux-plugins
 backup-tmux-plugins: \
 	tmux/tmux-plugins-$(shell date "+%Y-%m-%d").tar.bz2
 
-zsh/zplug-%.tar.bz2: zsh/zplug
-	cd zsh && tar -cjf "$(shell basename "$@")" zplug
+.PHONY: backup-zplug
+backup-zplug: \
+	zsh/zplug-$(shell date "+%Y-%m-%d").tar.bz2
 
 tmux/tmux-plugins-%.tar.bz2: tmux/plugins
 	cd tmux && tar -cjf "$(shell basename "$@")" plugins
+
+zsh/zplug-%.tar.bz2: zsh/zplug
+	cd zsh && tar -cjf "$(shell basename "$@")" zplug
+
+#
+# Internals
+#
+
+DEP_PATHS =
+
+define dep-file
+DEP_PATHS += $(1)
+$(1):
+	echo "fetching $(1)..."
+	mkdir -p "$(shell dirname "$(1)")" && \
+		curl -s -L -o "$(1)" "$(2)"
+
+.PHONY: remove_$(1)
+remove_$(1):
+	( test -f "$(1)" && rm "$(1)" && echo "removed $(1)" ) || exit 0
+
+.PHONY: update_$(1)
+update_$(1): remove_$(1) $(1)
+endef
+
+#
+# Specify Dependencies
+#
+
+$(eval $(call dep-file,zsh/completion/_docker-compose,https://github.com/docker/compose/raw/master/contrib/completion/zsh/_docker-compose))