Create a more automatic makefile for org-mode trees.

Unfortunately, this seems to rebuild every source file every time so I still need to work on fixing that.

org_mode_samples/Makefile

@@ -0,0 +1,25 @@
+SHELL := bash
+.ONESHELL:
+.SHELLFLAGS := -eu -o pipefail -c
+.DELETE_ON_ERROR:
+MAKEFLAGS += --warn-undefined-variables
+MAKEFLAGS += --no-builtin-rules
+SUBDIRS := $(wildcard */.)
+OUT=out
+
+ifeq ($(origin .RECIPEPREFIX), undefined)
+  $(error This Make does not support .RECIPEPREFIX. Please use GNU Make 4.0 or later)
+endif
+.RECIPEPREFIX = >
+
+.PHONY: all
+all:
+> for dir in $(SUBDIRS); do \
+>   make -C $$dir $@; \
+> done
+
+.PHONY: clean
+clean:
+> for dir in $(SUBDIRS); do \
+>   make -C $$dir $@; \
+> done

org_mode_samples/exit_matcher_investigation/Makefile

@@ -0,0 +1,24 @@
+SHELL := bash
+.ONESHELL:
+.SHELLFLAGS := -eu -o pipefail -c
+.DELETE_ON_ERROR:
+MAKEFLAGS += --warn-undefined-variables
+MAKEFLAGS += --no-builtin-rules
+OUT=out
+SRCFILES := $(wildcard *.org)
+OUTFILES := $(patsubst %.org,%.org.tree.txt,$(SRCFILES))
+
+ifeq ($(origin .RECIPEPREFIX), undefined)
+  $(error This Make does not support .RECIPEPREFIX. Please use GNU Make 4.0 or later)
+endif
+.RECIPEPREFIX = >
+
+.PHONY: all
+all: ../common.el ../dump_org_ast.bash $(SRCFILES)
+> for f in $(SRCFILES); do
+>   ../dump_org_ast.bash $$f $$f.tree.txt; \
+> done
+
+.PHONY: clean
+clean:
+> rm -rf $(OUTFILES)

org_mode_samples/exit_matcher_investigation/README.org

@@ -0,0 +1 @@
+This folder is an investigation into whether or not my exit matchers should operate from the top down or bottom up.