test: add terminal coverage summary helper

1 files changed, 57 insertions, 0 deletions

diff --git a/scripts/coverage-summary.el b/scripts/coverage-summary.el
new file mode 100644
index 00000000..4947171f
--- /dev/null
+++ b/scripts/coverage-summary.el
@@ -0,0 +1,57 @@
+;;; coverage-summary.el --- Terminal summary for SimpleCov module coverage -*- lexical-binding: t; -*-
+
+;;; Commentary:
+;; Batch helper for `make coverage' and `make coverage-summary'.
+;; Reuses coverage-core's SimpleCov parser and whole-project formatter so the
+;; terminal table matches the editor's whole-project coverage semantics.
+
+;;; Code:
+
+(require 'coverage-core)
+
+(defun cj/coverage-summary--copy-lines (lines)
+  "Return a copy of hash table LINES."
+  (let ((copy (make-hash-table :test 'eql)))
+	(when (hash-table-p lines)
+	  (maphash (lambda (line value)
+				 (puthash line value copy))
+			   lines))
+	copy))
+
+(defun cj/coverage-summary--modules-only (table module-dir project-root)
+  "Filter coverage TABLE to files under MODULE-DIR.
+
+Returned keys are relative to PROJECT-ROOT for readable terminal output."
+  (let ((result (make-hash-table :test 'equal))
+		(module-dir (file-name-as-directory (expand-file-name module-dir)))
+		(project-root (file-name-as-directory (expand-file-name project-root))))
+	(maphash
+	 (lambda (path lines)
+	   (let ((absolute-path (expand-file-name path)))
+		 (when (string-prefix-p module-dir absolute-path)
+		   (puthash (file-relative-name absolute-path project-root)
+					(cj/coverage-summary--copy-lines lines)
+					result))))
+	 table)
+	result))
+
+(defun cj/coverage-summary-text (report-file module-dir project-root)
+  "Return a whole-project coverage summary for MODULE-DIR from REPORT-FILE."
+  (let* ((covered (cj/coverage-summary--modules-only
+				   (cj/--coverage-parse-simplecov report-file)
+				   module-dir
+				   project-root))
+		 (executable (cj/coverage-summary--modules-only
+					  (cj/--coverage-simplecov-executable-lines report-file)
+					  module-dir
+					  project-root))
+		 (records (cj/--coverage-intersect covered executable)))
+	(cj/--coverage-format-summary records "modules/")))
+
+(defun cj/coverage-print-module-summary (report-file module-dir project-root)
+  "Print a whole-project coverage summary for MODULE-DIR from REPORT-FILE."
+  (princ "\n")
+  (princ (cj/coverage-summary-text report-file module-dir project-root)))
+
+(provide 'coverage-summary)
+;;; coverage-summary.el ends here