# Elisp coverage — Makefile fragment + setup recommendation
#
# This file is owned by the project, not the rulesets bundle. The bundle never
# edits your Makefile. Copy the two targets below into your own Makefile (and
# adjust the variables at the top), then delete this file or keep it as a note.
#
# What you get:
#   make coverage          runs the test suite under undercover, writing a
#                          SimpleCov JSON report to .coverage/simplecov.json
#   make coverage-summary  prints a per-file table, a unit-weighted project
#                          number, and — the point — every source file on disk
#                          that no test imported, counted as 0%.
#
# Why the summary matters: a module no test loads never appears in undercover's
# output, so a line-weighted total silently skips it. The summary weights by
# file and counts a missing file as 0%, so untested modules stay visible.
#
# ---------------------------------------------------------------------------
# Prerequisite: undercover
#
# Add undercover to your test dependencies and arm it in your test runner
# (e.g. tests/run-coverage-file.el) before the source under test is loaded:
#
#   (when (require 'undercover nil t)
#     (undercover "modules/*.el"
#                 (:report-format 'simplecov)
#                 (:report-file ".coverage/simplecov.json")
#                 (:merge-report t)))
#
# Sources must be loaded from .el (not byte-compiled .elc) for instrumentation
# to attach — the coverage target deletes stale .elc first.
# ---------------------------------------------------------------------------

# Variables — adjust to your layout.
EMACS         ?= emacs
SOURCE_DIR    ?= modules
COVERAGE_DIR  ?= .coverage
COVERAGE_FILE ?= $(COVERAGE_DIR)/simplecov.json
# The summary script ships with the bundle under .claude/scripts/ (gitignored).
COVERAGE_SUMMARY ?= .claude/scripts/coverage-summary.el

coverage:
	@rm -f $(COVERAGE_FILE) $(SOURCE_DIR)/*.elc
	@mkdir -p $(COVERAGE_DIR)
	@UNDERCOVER_FORCE=true $(EMACS) --batch -L $(SOURCE_DIR) -L tests \
		$(foreach t,$(wildcard tests/test-*.el),-l $(t)) \
		-f ert-run-tests-batch-and-exit
	@$(MAKE) coverage-summary

coverage-summary:
	@if [ ! -f $(COVERAGE_FILE) ]; then \
		echo "[!] No coverage file at $(COVERAGE_FILE). Run 'make coverage' first."; \
		exit 1; \
	fi
	@$(EMACS) --batch -q -l $(COVERAGE_SUMMARY) \
		--eval '(cj/coverage-print-module-summary "$(COVERAGE_FILE)" "$(SOURCE_DIR)" "$(CURDIR)")'