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[libgweather/ebassi/ci-coverage] ci: Generate a coverage HTML report

commit 0d4280a3d26b68104f46db64c8f4539bf8614a41
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Nov 23 01:30:43 2021 +0000

    ci: Generate a coverage HTML report
    
    Using the lcov report and its genhtml tool.

 .gitlab-ci.yml             |  2 ++
 .gitlab-ci/gen-coverage.sh | 30 ++++++++++++++++++++++++++++++
 2 files changed, 32 insertions(+)
---
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
index 892ee2e1..20c50dd7 100644
--- a/.gitlab-ci.yml
+++ b/.gitlab-ci.yml
@@ -289,6 +289,8 @@ coverage:
     - lcov --config-file .gitlab-ci/lcovrc --directory _build --capture --initial --output-file 
"_coverage/${CI_JOB_NAME}-baseline.lcov"
     - meson test -C _build
     - lcov --config-file .gitlab-ci/lcovrc --directory _build --capture --output-file 
"_coverage/${CI_JOB_NAME}.lcov"
+    - bash -x .gitlab-ci/gen-coverage.sh
+  coverage: '/^\s+lines\.+:\s+([\d.]+\%)\s+/'
   artifacts:
     name: "gweather-${CI_JOB_NAME}-${CI_COMMIT_REF_NAME}"
     when: always
diff --git a/.gitlab-ci/gen-coverage.sh b/.gitlab-ci/gen-coverage.sh
new file mode 100644
index 00000000..c15fe29f
--- /dev/null
+++ b/.gitlab-ci/gen-coverage.sh
@@ -0,0 +1,30 @@
+#!/bin/bash
+
+set -e
+
+for path in _coverage/*.lcov; do
+        lcov --config-file .gitlab-ci/lcovrc -r "${path}" '*/_build/*' -o "$(pwd)/${path}"
+        lcov --config-file .gitlab-ci/lcovrc -e "${path}" "$(pwd)/*" -o "$(pwd)/${path}"
+done
+
+genhtml \
+        --ignore-errors=source \
+        --config-file .gitlab-ci/lcovrc \
+        _coverage/*.lcov \
+        -o _coverage/coverage
+
+cd _coverage
+rm -f ./*.lcov
+
+cat >index.html <<EOL
+<html>
+<head><title>GWeather Coverage</title></head>
+<body>
+<div>
+<ul>
+<li><a href="coverage/index.html">Coverage report</a></li>
+</ul>
+</div>
+</body>
+</html>
+EOL
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