Run gen-extra-source-files.sh in Travis.

Signed-off-by: Edward Z. Yang <ezyang@cs.stanford.edu>

.travis.yml

@@ -33,6 +33,9 @@ script:
 
 # Cabal
  - cd Cabal
+# Test if gen-extra-source-files.sh was run recently enough
+ - ./misc/gen-extra-source-files.sh
+ - ./misc/travis-diff-files.sh
  - mkdir -p ./dist/setup
  - cp Setup.hs ./dist/setup/setup.hs
  - ghc --make -odir ./dist/setup -hidir ./dist/setup -i -i. ./dist/setup/setup.hs -o ./dist/setup/setup -Wall -Werror -threaded  # the command cabal-install would use to build setup

Cabal/Cabal.cabal

@@ -112,7 +112,6 @@ extra-source-files:
   tests/PackageTests/TemplateHaskell/vanilla/Lib.hs
   tests/PackageTests/TemplateHaskell/vanilla/TH.hs
   tests/PackageTests/TemplateHaskell/vanilla/my.cabal
-  tests/PackageTests/Tests.hs
   tests/PackageTests/TestOptions/TestOptions.cabal
   tests/PackageTests/TestOptions/test-TestOptions.hs
   tests/PackageTests/TestStanza/my.cabal

Cabal/misc/gen-extra-source-files.sh

 #!/bin/sh
+set -ex
 
 find tests -type f \( -name '*.hs' -or -name '*.lhs' -or -name '*.c' -or -name '*.sh' \
     -or -name '*.cabal' -or -name '*.hsc' \) -and -not -regex ".*/dist/.*" \
     | awk '/Check.hs$|UnitTests|PackageTester|autogen|PackageTests.hs|CreatePipe/ { next } { print }' \
-    | LC_COLLATE=C sort \
+    | LC_ALL=C sort \
     | sed -e 's/^/  /' \
     > misc/source-file-list
 

Cabal/misc/travis-diff-files.sh

+#!/bin/sh
+! git diff-files -p --exit-code