[PATCH 5/6] Makefile: Add coverage-report-cover-db-html target

Add a target to generate a detailed HTML report for the entire Git
codebase using Devel::Cover's cover(1) tool. Output it in
cover_db_html instead of the default cover_db, so that it isn't mixed
up with our raw report files.

The target depends on the coverage-report-cover-db target, it may be
run redundantly if it was previously run. But the HTML output won't be
affected by running gcov2perl twice, so I didn't try to avoid that
small redundancy.

Signed-off-by: Ævar Arnfjörð Bjarmason <redacted>
---
 .gitignore |    1 +
 Makefile   |    3 +++
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/.gitignore b/.gitignore
index 5e24b0b..e02f1f9 100644
--- a/.gitignore
+++ b/.gitignore

@@ -218,3 +218,4 @@
 /compat/*.gcov
 /coverage-untested-functions
 /cover_db
+/cover_db_html

diff --git a/Makefile b/Makefile
index b15c894..c35c348 100644
--- a/Makefile
+++ b/Makefile

@@ -2307,3 +2307,6 @@ coverage-report-untested-functions:
 
 coverage-report-cover-db:
 	gcov2perl -db cover_db *.gcov
+
+coverage-report-cover-db-html: coverage-report-cover-db
+	cover -report html -outputdir cover_db_html cover_db

-- 
1.7.0.4