Incorporate the whitespace linter from the CTL project

This just brings over the whitespace linter and updates any
files that may have been out of compliance.  It's also a small
update to .gitignore to not care about the .out files generated
by a make cover command.

Change-Id: I3e5a4f170f0fd7724949708a290a1e13def834fb

.gitignore

@@ -1,5 +1,5 @@
 # Coverage File
-coverage.out
+*.out
 tools/bin
 tools/*node*
 

LICENSE

@@ -1,8 +1,8 @@
-Apache License 
-Version 2.0, January 2004 
+Apache License
+Version 2.0, January 2004
 http://www.apache.org/licenses/
 
-TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 
 1. Definitions.
 
@@ -10,7 +10,7 @@ TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
 and distribution as defined by Sections 1 through 9 of this document.
 
 "Licensor" shall mean the copyright owner or entity authorized by the
-copyright owner that is granting the License.  
+copyright owner that is granting the License.
 
 "Legal Entity" shall mean the union of the acting entity and all other
 entities that control, are controlled by, or are under common control
@@ -21,7 +21,7 @@ of fifty percent (50%) or more of the outstanding shares, or (iii)
 beneficial ownership of such entity.
 
 "You" (or "Your") shall mean an individual or Legal Entity exercising
-permissions granted by this License.  
+permissions granted by this License.
 
 "Source" form shall mean the preferred form for making modifications,
 including but not limited to software source code, documentation source,
@@ -30,12 +30,12 @@ and configuration files.
 "Object" form shall mean any form resulting from mechanical transformation
 or translation of a Source form, including but not limited to compiled
 object code, generated documentation, and conversions to other media
-types.  
+types.
 
 "Work" shall mean the work of authorship, whether in Source or
 Object form, made available under the License, as indicated by a copyright
 notice that is included in or attached to the work (an example is provided
-in the Appendix below).  
+in the Appendix below).
 
 "Derivative Works" shall mean any work, whether in Source or Object form,
 that is based on (or derived from) the Work and for which the editorial
@@ -170,7 +170,7 @@ hold each Contributor harmless for any liability incurred by, or claims
 asserted against, such Contributor by reason of your accepting any such
 warranty or additional liability.
 
-END OF TERMS AND CONDITIONS 
+END OF TERMS AND CONDITIONS
 
 APPENDIX: How to apply the Apache License to your work.
 

Makefile

@@ -154,9 +154,16 @@ docs:
 
 .PHONY: lint
 lint: tidy $(LINTER) $(NPX)
+	@echo "Performing linting steps..."
+	@echo "Running whitespace linting step..."
+	@./tools/whitespace_linter
+	@echo "Running golangci-lint linting step..."
 	$(LINTER) run --config $(LINTER_CONFIG)
+	@echo "Running eslint for JavaScript linting step..."
 	cd $(WEBDIR) && (PATH="$(PATH):$(JSLINTER_BIN)"; $(NPX) --no-install eslint js) && cd ..
+	@echo "Running eslint for HTML linting step..."
 	cd $(WEBDIR) && (PATH="$(PATH):$(JSLINTER_BIN)"; $(NPX) --no-install eslint --ext .html .) && cd ..
+	@echo "Linting completed successfully"
 
 .PHONY: tidy
 tidy:

tools/install_js_linter

@@ -15,7 +15,7 @@ if [[ ! -d $tools_bin_dir/node-$node_version ]]; then
       mv $tools_bin_dir/node-$node_version-linux-x64 $tools_bin_dir/node-$node_version
     fi
   elif [[ "$OSTYPE" == "darwin"* ]]; then
-    # Mac OSX 
+    # Mac OSX
     if ! curl -sfL "https://nodejs.org/dist/$node_version/node-$node_version-darwin-x64.tar.gz" | tar zxf - --directory "$tools_bin_dir"; then
       printf "Something went wrong while installing Mac OSX nodejs\n" 1>&2
       exit 1

tools/whitespace_linter

@@ -0,0 +1,11 @@
+#!/usr/bin/env bash
+
+# git 1.9.0+ allows for exclusions in pathspecs via ':!foo' syntax.
+# However, until git 2.13.0 there must be at least one "inclusive" pathspec, hence the './*'
+trailing_whitespace=$(git grep -E -n -- ' +$' -- './*' ':!*.png' ':!*.jpg')
+
+if [[ -n "$trailing_whitespace" ]]; then
+  printf "ERROR: Trailing whitespaces:\n"
+  awk 'BEGIN {FS=":"} {printf " * %s:%s\n", $1, $2}' <<< "$trailing_whitespace"
+  exit 1
+fi