Use makem.sh instead of CMake and custom Makefile

Also use makem.sh's support for checkdoc, since the previously-used
checkdoc-batch URL is broken.

.gitignore

@@ -1,6 +1,2 @@
 *.elc
 *~
-CMakeCache.txt
-CMakeFiles/
-/Makefile
-cmake_install.cmake

CONTRIBUTING.md

@@ -2,7 +2,7 @@ Tips for contributors
 ---------------------
 
 * In your local repository, ensure that everything compiles by **running
-  `cmake . && make`** (this will launch byte compilation of lisp files and regression
+  `make`** (this will launch byte compilation of lisp files and regression
   tests).
 * You are then ready to make a **pull request**. Please make pull requests
   **against `master`**.
@@ -30,6 +30,9 @@ description on GitHub.
 
 **./LICENSE.md**: the [GPLv2] license.
 
+**./makem.sh** and **./Makefile**: build scripts for linting and testing this
+project, copied from [makem].
+
 **./*.el**: the [Emacs] ledger-mode lisp code.
 
 **./doc/**: documentation, and tools for generating documents such as the *pdf*
@@ -47,3 +50,4 @@ manual.
 [Emacs]: http://www.gnu.org/software/emacs/
 [GPLv2]: http://www.gnu.org/licenses/gpl-2.0.html
 [github]: https://github.com/ledger/ledger-mode/
+[makem]: https://github.com/alphapapa/makem.sh/

Makefile

@@ -0,0 +1,59 @@
+# * makem.sh/Makefile --- Script to aid building and testing Emacs Lisp packages
+
+# URL: https://github.com/alphapapa/makem.sh
+# Version: 0.5
+
+# * Arguments
+
+# For consistency, we use only var=val options, not hyphen-prefixed options.
+
+# NOTE: I don't like duplicating the arguments here and in makem.sh,
+# but I haven't been able to find a way to pass arguments which
+# conflict with Make's own arguments through Make to the script.
+# Using -- doesn't seem to do it.
+
+ifdef install-deps
+	INSTALL_DEPS = "--install-deps"
+endif
+ifdef install-linters
+	INSTALL_LINTERS = "--install-linters"
+endif
+
+ifdef sandbox
+	ifeq ($(sandbox), t)
+		SANDBOX = --sandbox
+	else
+		SANDBOX = --sandbox=$(sandbox)
+	endif
+endif
+
+ifdef debug
+	DEBUG = "--debug"
+endif
+
+# ** Verbosity
+
+# Since the "-v" in "make -v" gets intercepted by Make itself, we have
+# to use a variable.
+
+verbose = $(v)
+
+ifneq (,$(findstring vvv,$(verbose)))
+	VERBOSE = "-vvv"
+else ifneq (,$(findstring vv,$(verbose)))
+	VERBOSE = "-vv"
+else ifneq (,$(findstring v,$(verbose)))
+	VERBOSE = "-v"
+endif
+
+# * Rules
+
+# TODO: Handle cases in which "test" or "tests" are called and a
+# directory by that name exists, which can confuse Make.
+
+%:
+	@./makem.sh $(DEBUG) $(VERBOSE) $(SANDBOX) $(INSTALL_DEPS) $(INSTALL_LINTERS) $(@)
+
+.DEFAULT: init
+init:
+	@./makem.sh $(DEBUG) $(VERBOSE) $(SANDBOX) $(INSTALL_DEPS) $(INSTALL_LINTERS)