Add coverage check

.github/workflows/check.yml

@@ -58,6 +58,10 @@ jobs:
       if: always()
       run: bin/check/rust_version.py 7
 
+    - name: Coverage
+      if: always()
+      run: bin/check/coverage.sh
+
     - name: Rustfmt
       if: always()
       run: bin/check/rustfmt.sh

.gitignore

@@ -1,6 +1,7 @@
 *.swp
 *.swo
 *.pyc
+*.profraw
 .mypy_cache/
 
 target/

bin/check/coverage.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+set -Eeuo pipefail
+bin/install_prerequisites_ubuntu.sh
+bin/install_grcov.sh
+bin/test/test_prerequisites.sh
+bin/coverage_run.sh
+lines=$(bin/coverage_uncovered_lines.py packages/hurlfmt/src/format/json.rs)
+if [ -n "$lines" ]; then
+    echo "$lines"
+    exit 1
+fi

bin/coverage_run.sh

@@ -0,0 +1,24 @@
+#!/bin/bash
+set -Eeuo pipefail
+
+rm -rf target/profile
+rm -rf target/coverage
+cargo clean
+
+RUSTFLAGS="-Cinstrument-coverage"
+export RUSTFLAGS
+LLVM_PROFILE_FILE="$(pwd)/target/profile/test-integ-%p-%m.profraw"
+export LLVM_PROFILE_FILE
+
+cargo build
+PATH=$(pwd)/target/debug:$PATH
+export PATH
+bin/test/test_integ.sh
+grcov target/profile \
+    --binary-path target/debug \
+    --source-dir . \
+    --output-types html \
+    --branch \
+    --ignore-not-existing \
+    --output-path target/coverage
+

bin/coverage_uncovered_lines.py

@@ -0,0 +1,42 @@
+#!/usr/bin/env python3
+import sys
+from bs4 import BeautifulSoup
+
+COVERAGE_DIR = "target/coverage"
+
+
+def uncovered_lines(src_file):
+    html_file = COVERAGE_DIR + "/" + src_file + ".html"
+    sys.stderr.write(html_file + "\n")
+    html = open(html_file).read()
+    soup = BeautifulSoup(html, "html.parser")
+    elements = soup.select('div[role="row"]')
+    lines = []
+    for element in elements:
+        line = parse_row(element)
+        if line is not None:
+            lines.append(line)
+    return lines
+
+
+def parse_row(element):
+    uncovered = element.select(".has-background-danger-light")
+    if len(uncovered) > 0:
+        line_number = element.select("div:first-child")[0]["id"]
+        line = uncovered[0].select("pre")[0].text
+        return line_number, line
+    return None
+
+
+def main():
+    sys.stderr.write("Extracting uncovered lines\n")
+    for src_file in sys.argv[1:]:
+        lines = uncovered_lines(src_file)
+        if len(lines) > 0:
+            print(src_file)
+            for line_number, line in lines:
+                print("%s %s" % (line_number, line))
+
+
+if __name__ == "__main__":
+    main()