Update documentation with note about quoting

Author: leonid-shevtsov

README.md

@@ -67,10 +67,10 @@ $./split_tests -help
         CircleCI API key (or set CIRCLECI_API_KEY environment variable) - required to use CircleCI
   -circleci-project string
         CircleCI project name (e.g. github/leonid-shevtsov/split_tests) - required to use CircleCI
-  -glob string
-        Glob pattern to find test files (default "spec/**/*_spec.rb")
-  -exclude-glob string
-        Glob pattern to exclude test files
+  -glob 'pattern'
+        Glob pattern to find test files (default 'spec/**/*_spec.rb'). Make sure to single-quote the pattern to avoid shell expansion.
+  -exclude-glob 'pattern'
+        Glob pattern to exclude test files. Make sure to single-quote as well.
   -help
         Show this help text
   -junit

main.go

@@ -66,8 +66,8 @@ func addNewFiles(fileTimes map[string]float64, currentFileSet map[string]bool) {
 }
 
 func parseFlags() {
-	flag.StringVar(&testFilePattern, "glob", "spec/**/*_spec.rb", "Glob pattern to find test files")
-	flag.StringVar(&excludeFilePattern, "exclude-glob", "", "Glob pattern to exclude test files")
+	flag.StringVar(&testFilePattern, "glob", "spec/**/*_spec.rb", "Glob pattern to find test files. Make sure to single-quote to avoid shell expansion.")
+	flag.StringVar(&excludeFilePattern, "exclude-glob", "", "Glob pattern to exclude test files. Make sure to single-quote.")
 
 	flag.IntVar(&splitIndex, "split-index", -1, "This test container's index (or set CIRCLE_NODE_INDEX)")
 	flag.IntVar(&splitTotal, "split-total", -1, "Total number of containers (or set CIRCLE_NODE_TOTAL)")