build: add eask manifest and setup/compile/coverage targets

I switched the test runner from `~/.emacs.d/elpa`-grep to eask. With
this, `make setup` installs every dep into a project-local `.eask/`,
so test runs don't depend on whatever's in my global elpa. It also
lets us catch missing Package-Requires entries before MELPA submission.

New targets:

- `make setup` — runs `eask install-deps --dev`
- `make compile` — byte-compiles chime.el and surfaces warnings that
  checkdoc and elisp-lint don't catch
- `make coverage` — runs the unit suite under undercover and writes a
  simplecov JSON to `.coverage/simplecov.json`
- `make test-all` — runs every test, including `:slow` tagged
- `-include makefile-local` in both Makefiles, for per-machine knobs

I added `ERT_FAST_SELECTOR` so `make test`, `test-unit`,
`test-integration`, and `test-file` exclude tests tagged `:slow`. When
we tag end-to-end integration tests as `:slow`, they'll stay out of
the fast feedback loop until someone explicitly asks for them via
`make test-all`.

Eask treats CWD as its workspace. So all eask invocations now run
from project root, with `(cd "tests/")' as the first `--eval' to
restore Emacs's default-directory. That preserves the relative loads
the existing test files and test-bootstrap.el rely on, without
touching either.

I updated `.gitignore` for `.eask/`, `.coverage/`, and the optional
`makefile-local` files.

1 files changed, 44 insertions, 0 deletions

diff --git a/tests/run-coverage-file.el b/tests/run-coverage-file.el
new file mode 100644
index 0000000..0a07696
--- /dev/null
+++ b/tests/run-coverage-file.el
@@ -0,0 +1,44 @@
+;;; run-coverage-file.el --- Undercover setup for per-file coverage runs -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Loaded by `make coverage' before each test file runs, BEFORE
+;; chime.el is loaded.  Instrumenting must happen first so the
+;; subsequent load picks up the instrumented source.
+;;
+;; Coverage data is merged across per-file invocations into a single
+;; simplecov JSON at .coverage/simplecov.json (under the project root).
+
+;;; Code:
+
+(unless (require 'undercover nil t)
+  (message "")
+  (message "ERROR: undercover not installed.")
+  (message "Run 'make setup' to install development dependencies.")
+  (message "")
+  (kill-emacs 1))
+
+;; Resolve project root from this file's location so undercover patterns
+;; and the report-file path don't depend on default-directory at load time.
+(defvar run-coverage--project-root
+  (file-name-directory
+   (directory-file-name
+    (file-name-directory (or load-file-name buffer-file-name))))
+  "Absolute path to the chime project root.")
+
+;; Force coverage collection in non-CI environments.  Must be set after
+;; loading undercover because the library's top-level form
+;; `(setq undercover-force-coverage (getenv "UNDERCOVER_FORCE"))' would
+;; otherwise overwrite the value.
+(setq undercover-force-coverage t)
+
+;; The `undercover' macro splices each configuration list into `(list ,@it)',
+;; which evaluates the elements.  Wildcard strings have to stay atoms — using
+;; `(:files ...)' form lets us evaluate `expand-file-name' to an absolute path.
+(undercover (:files (expand-file-name "chime.el" run-coverage--project-root))
+            (:report-format 'simplecov)
+            (:report-file (expand-file-name ".coverage/simplecov.json"
+                                            run-coverage--project-root))
+            (:merge-report t)
+            (:send-report nil))
+
+;;; run-coverage-file.el ends here