Fix for macOS

.travis.yml

@@ -1,14 +1,24 @@
-language: sh
+language: shell
+os: linux
 dist: bionic
-services:
-  - docker
 addons:
   apt:
     update: true
+    packages: [bash, mksh, yash, zsh, shellcheck]
+  homebrew:
+    update: true
+    packages: [shellcheck]
+jobs:
+  include:
+    - os: linux
+      dist: bionic
+      env: COVERAGE=1
+      services: docker
+    - os: osx
+      osx_image: xcode11.3
 before_install:
-  - sudo apt-get install -y bash mksh yash zsh
   - curl -fsSL https://git.io/shellspec | sh -s master -y
 script:
   - make test
   - make check
-  - make coveralls
+  - if [ "$COVERAGE" ]; then make coveralls; fi

Makefile

@@ -1,10 +1,10 @@
 all:	test check
 
 test:
-	shellspec -s bash --no-quick
-	shellspec -s zsh --no-quick
-	shellspec -s mksh --no-quick
-	shellspec -s yash --no-quick
+	if type bash; then shellspec -s bash --no-quick; fi
+	if type zsh;  then shellspec -s zsh --no-quick;  fi
+	if type mksh; then shellspec -s mksh --no-quick; fi
+	if type yash; then shellspec -s yash --no-quick; fi
 
 check:
 	shellcheck shellmetrics spec/shellmetrics_spec.sh

shellmetrics

@@ -156,7 +156,8 @@ pretty() {
   while [ "$i" -gt 0 ] && i=$((i - 1)); do
     echo '}'
   done
-  echo "typeset -fp shellmetrics_wrapper"
+  echo "typeset -fp shellmetrics_wrapper 2>/dev/null" \
+    "|| typeset -f shellmetrics_wrapper"
 }
 
 process() {