travis-ci: added checks for any uses of tabs and lines longer than 80 cols in Lua source files.

Author: agentzh

.travis.yml

@@ -42,6 +42,8 @@ env:
 before_install:
   - sudo luarocks install luacheck
   - luacheck -q .
+  - '! grep -n -P ''(?<=.{80}).+'' --color `find . -name ''*.lua''` || (echo "ERROR: Found Lua source lines exceeding 80 columns." > /dev/stderr; exit 1)'
+  - '! grep -n -P ''\t+'' --color `find . -name ''*.lua''` || (echo "ERROR: Cannot use tabs." > /dev/stderr; exit 1)'
   - sudo cpanm --notest Test::Nginx > build.log 2>&1 || (cat build.log && exit 1)
 
 install: