Do not install coverage tool unless CODECOV=1

Do not perform format check when `FORMAT_CHECK=0`

Author: polytypic

travis-ci

@@ -62,8 +62,8 @@ if [ "$TRAVIS_OS_NAME" = "linux" ]; then
   folded ... concurrently LIBSTD_INSTALL_PID locked bash -c "sudo -E apt-add-repository -y ppa:ubuntu-toolchain-r/test && sudo -E apt-get -yq update && sudo -E apt-get -yq --no-install-suggests --no-install-recommends install libstdc++-8-dev"
   folded ... concurrently GCC_INSTALL_PID locked sudo -E apt-get -yq --no-install-suggests --no-install-recommends install g++-8
 elif [ "$TRAVIS_OS_NAME" = "osx" ]; then
-  folded ... concurrently LCOV_INSTALL_PID locked brew install lcov
-  folded ... concurrently FORMAT_INSTALL_PID locked brew install prettier clang-format
+  [ "$CODECOV" != 1 ] || folded ... concurrently LCOV_INSTALL_PID locked brew install lcov
+  [ "$FORMAT_CHECK" = 0 ] || folded ... concurrently FORMAT_INSTALL_PID locked brew install prettier clang-format
 elif [ "$TRAVIS_OS_NAME" = "windows" ]; then
   folded ... concurrently MAKE_INSTALL_PID locked choco install make
 fi
@@ -115,12 +115,11 @@ format-check() {
 }
 
 if [ "$TRAVIS_OS_NAME" = "osx" ]; then
-  if [ -n "$CODECOV" ]; then
-    folded ... finish LCOV_INSTALL_PID
-  fi
-  folded "Code coverage" code-coverage
-  folded ... finish FORMAT_INSTALL_PID
-  folded "Format check" format-check
+  [ "$CODECOV" != 1 ] || folded ... finish LCOV_INSTALL_PID
+  [ "$CODECOV" != 1 ] || folded "Code coverage" code-coverage
+
+  [ "$FORMAT_CHECK" = 0 ] || folded ... finish FORMAT_INSTALL_PID
+  [ "$FORMAT_CHECK" = 0 ] || folded "Format check" format-check
 fi
 
 install-output() { cat "$OUT"; }