Update panic lint script with more functions

.github/lint-disallowed-functions-in-library.sh

@@ -0,0 +1,16 @@
+#!/usr/bin/env bash
+set -e
+
+# Disallow usages of functions that cause the program to exit in the library code
+SCRIPT_PATH=$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )
+EXCLUDE_DIRECTORIES="--exclude-dir=examples --exclude-dir=.git --exclude-dir=.github "
+DISALLOWED_FUNCTIONS=('os.Exit(', 'panic(', 'Fatal(', 'Fatalf(', 'Fatalln(')
+
+
+for disallowedFunction in "${DISALLOWED_FUNCTIONS[@]}"
+do
+	if grep -R $EXCLUDE_DIRECTORIES -e "$disallowedFunction" "$SCRIPT_PATH/.." | grep -v nolint; then
+		echo "$disallowedFunction may only be used in example code"
+		exit 1
+	fi
+done

.github/lint-panic-and-exit.sh

@@ -1,17 +0,0 @@
-#!/usr/bin/env bash
-set -e
-
-# Disallow usages of panic and os.Exit
-
-SCRIPT_PATH=$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )
-EXCLUDE_DIRECTORIES="--exclude-dir=examples --exclude-dir=.git --exclude-dir=.github "
-
-if grep -R $EXCLUDE_DIRECTORIES -e 'os.Exit(' "$SCRIPT_PATH/.." | grep -v nolint; then
-	echo "os.Exit( may only be used in example code"
-	exit 1
-fi
-
-if grep -R $EXCLUDE_DIRECTORIES -e 'panic(' "$SCRIPT_PATH/.." | grep -v nolint; then
-	echo "panic() may only be used in example code"
-	exit 1
-fi

.travis.yml

@@ -20,4 +20,4 @@ script:
   - golangci-lint run
   - goveralls -v -race -covermode=atomic -service=travis-ci
   - bash .github/assert-contributors.sh
-  - bash .github/lint-panic-and-exit.sh
+  - bash .github/lint-disallowed-functions-in-library.sh