Use color in pre-commit

hooks/pre-commit

@@ -1,5 +1,9 @@
 #!/bin/bash
 
+readonly reset=$(tput sgr0)
+readonly   red=$(tput bold; tput setaf 1)
+readonly green=$(tput bold; tput setaf 2)
+
 KUBE_HOOKS_DIR="$(dirname "$(test -L "$0" && echo "$(dirname $0)/$(readlink "$0")" || echo "$0")")"
 
 exit_code=0
@@ -16,15 +20,15 @@ for file in "${files[@]}"; do
 done
 
 if [[ "${#files_need_gofmt[@]}" -ne 0 ]]; then
-  echo "ERROR!"
+  echo "${red}ERROR!"
   echo "Some files have not been gofmt'd.  To fix these errors, "
   echo "cut and paste the following:"
   echo "  gofmt -s -w ${files_need_gofmt[@]}"
   exit_code=1
 else
-  echo "OK"
+  echo "${green}OK"
 fi
-echo
+echo "${reset}"
 
 echo -ne "Checking for files that need boilerplate... "
 files_need_boilerplate=()
@@ -47,7 +51,7 @@ if [[ ${#files} -gt 0 ]]; then
 fi
 
 if [[ "${#files_need_boilerplate[@]}" -ne 0 ]]; then
-  echo "ERROR!"
+  echo "${red}ERROR!"
   echo "Some files are missing the required boilerplate header"
   echo "from hooks/boilerplate.txt:"
   for file in "${files_need_boilerplate[@]}"; do
@@ -55,9 +59,9 @@ if [[ "${#files_need_boilerplate[@]}" -ne 0 ]]; then
   done
   exit_code=1
 else
-  echo "OK"
+  echo "${green}OK"
 fi
-echo
+echo "${reset}"
 
 echo -ne "Checking for API descriptions... "
 files_need_description=()
@@ -71,7 +75,7 @@ for file in $(git diff --cached --name-only --diff-filter ACM | egrep "pkg/api/v
 done
 
 if [[ "${#files_need_description[@]}" -ne 0 ]]; then
-  echo "ERROR!"
+  echo "${red}ERROR!"
   echo "Some API files are missing the required field descriptions."
   echo "Add description tags to all non-inline fields in the following files:"
   for file in "${files_need_description[@]}"; do
@@ -79,20 +83,20 @@ if [[ "${#files_need_description[@]}" -ne 0 ]]; then
   done
   exit_code=1
 else
-  echo "OK"
+  echo "${green}OK"
 fi
-echo
+echo "${reset}"
 
 echo -ne "Checking for docs that need updating... "
 if ! hack/verify-gendocs.sh > /dev/null; then
-  echo "ERROR!"
+  echo "${red}ERROR!"
   echo "Some docs are out of sync between CLI and markdown."
   echo "To regenerate docs, run:"
   echo "  hack/run-gendocs.sh > docs/kubectl.md"
   exit_code=1
 else
-  echo "OK"
+  echo "${green}OK"
 fi
-echo
+echo "${reset}"
 
 exit $exit_code