Meta: Add/Update makem.sh, etc.

This will also lint and test PRs' branches.

See #58.

.github/workflows/test.yml

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+# * test.yml --- Test Emacs packages using makem.sh on GitHub Actions
+
+# URL: https://github.com/alphapapa/makem.sh
+# Version: 0.6-pre
+
+# * Commentary:
+
+# Based on Steve Purcell's examples at
+# <https://github.com/purcell/setup-emacs/blob/master/.github/workflows/test.yml>,
+# <https://github.com/purcell/package-lint/blob/master/.github/workflows/test.yml>.
+
+# * License:
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU 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 General Public License for more details.
+
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# * Code:
+
+name: "CI"
+on:
+  pull_request:
+  push:
+    # Comment out this section to enable testing of all branches.
+    # branches:
+    #   - master
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        emacs_version:
+          - 26.3
+          - 27.2
+          - 28.2
+          - 29.1
+          - snapshot
+    steps:
+    - uses: purcell/setup-emacs@master
+      with:
+        version: ${{ matrix.emacs_version }}
+
+    - uses: actions/checkout@v2
+
+    - name: Install Ispell
+      run: |
+        sudo apt-get install ispell
+
+    - name: Initialize sandbox
+      run: |
+        SANDBOX_DIR=$(mktemp -d) || exit 1
+        echo "SANDBOX_DIR=$SANDBOX_DIR" >> $GITHUB_ENV
+        ./makem.sh -vv --sandbox=$SANDBOX_DIR --install-deps --install-linters
+
+    # The "all" rule is not used, because it treats compilation warnings
+    # as failures, so linting and testing are run as separate steps.
+
+    - name: Lint
+      # NOTE: Uncomment this line to treat lint failures as passing
+      #       so the job doesn't show failure.
+      # continue-on-error: true
+      run: ./makem.sh -vv --sandbox=$SANDBOX_DIR lint
+
+    - name: Test
+      if: always()  # Run test even if linting fails.
+      run: ./makem.sh -vv --sandbox=$SANDBOX_DIR test
+
+# Local Variables:
+# eval: (outline-minor-mode)
+# End:

Makefile

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+# * 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)