Scale back build matrix

This matrix takes forever to build and makes the CI setup more
complicated with various stack yamls fixing versions. I think it is
reasonable to test the last 3 LTS and nightly.

.travis.yml

@@ -6,6 +6,8 @@
 # and taking the idea of using cabal-meta from yesodweb/yesod.
 
 sudo: false
+dist: trusty
+language: c
 
 services:
  - redis-server
@@ -23,14 +25,11 @@ cache:
 
 matrix:
   include:
-    - env: STACKARGS="--stack-yaml=stack_lts-2.yaml"
-    - env: STACKARGS="--resolver=lts-3"
-    - env: STACKARGS="--resolver=lts-4"
-    - env: STACKARGS="--resolver=lts-5"
-    - env: STACKARGS="--resolver=lts-6"
-    - env: STACKARGS="--stack-yaml=stack_lts-7.yaml"
-    - env: STACKARGS="--stack-yaml=stack_lts-8.yaml"
-    - env: STACKARGS="--stack-yaml=stack_nightly.yaml"
+    # last 3 LTS and nightly
+    - env: STACKARGS="--resolver=lts-8"
+    - env: STACKARGS="--resolver=lts-9"
+    - env: STACKARGS="--resolver=lts-10"
+    - env: STACKARGS="--resolver=nightly"
 
 before_install:
   # Download and unpack the stack executable

stack.yaml

@@ -24,7 +24,14 @@ flags:
   serversession-frontend-yesod:
     lib-Werror: true
 extra-deps:
+  # for lts 9, 10
   - acid-state-0.14.3
   - snap-1.1.0.0
+  - snap-core-1.0.3.1
+  - snap-server-1.0.3.3
   - heist-1.0.1.2
   - map-syntax-0.2.0.2
+  - xmlhtml-0.2.5.2
+  # for lts-8
+  - blaze-html-0.9.0.1
+  - blaze-markup-0.8.2.0

stack_lts-2.yaml

@@ -1,31 +0,0 @@
-resolver: lts-2.22
-packages:
-  - serversession
-  - serversession-backend-acid-state
-  - serversession-backend-persistent
-  - serversession-backend-redis
-  - serversession-frontend-snap
-  - serversession-frontend-wai
-  - serversession-frontend-yesod
-  - examples/serversession-example-yesod-persistent
-flags:
-  serversession:
-    lib-Werror: true
-  serversession-backend-acid-state:
-    lib-Werror: true
-  serversession-backend-persistent:
-    lib-Werror: true
-  serversession-backend-redis:
-    lib-Werror: true
-    old-locale: true
-  serversession-frontend-snap:
-    lib-Werror: true
-  serversession-frontend-wai:
-    lib-Werror: true
-  serversession-frontend-yesod:
-    lib-Werror: true
-extra-deps:
-  - acid-state-0.14.0
-  - nonce-1.0.2
-  - wai-session-0.3.2
-  - hedis-0.6.6

stack_lts-7.yaml

@@ -1,30 +0,0 @@
-resolver: lts-7.19
-packages:
-  - serversession
-  - serversession-backend-acid-state
-  - serversession-backend-persistent
-  - serversession-backend-redis
-  - serversession-frontend-snap
-  - serversession-frontend-wai
-  - serversession-frontend-yesod
-  - examples/serversession-example-yesod-persistent
-flags:
-  serversession:
-    lib-Werror: true
-  serversession-backend-acid-state:
-    lib-Werror: true
-  serversession-backend-persistent:
-    lib-Werror: true
-  serversession-backend-redis:
-    lib-Werror: true
-  serversession-frontend-snap:
-    lib-Werror: true
-  serversession-frontend-wai:
-    lib-Werror: true
-  serversession-frontend-yesod:
-    lib-Werror: true
-extra-deps:
-  - snap-1.0.0.1
-  - heist-1.0.1.0
-  - map-syntax-0.2.0.2
-  - classy-prelude-yesod-1.1.0

stack_lts-8.yaml

@@ -1,29 +0,0 @@
-resolver: lts-8.3
-packages:
-  - serversession
-  - serversession-backend-acid-state
-  - serversession-backend-persistent
-  - serversession-backend-redis
-  - serversession-frontend-snap
-  - serversession-frontend-wai
-  - serversession-frontend-yesod
-  - examples/serversession-example-yesod-persistent
-flags:
-  serversession:
-    lib-Werror: true
-  serversession-backend-acid-state:
-    lib-Werror: true
-  serversession-backend-persistent:
-    lib-Werror: true
-  serversession-backend-redis:
-    lib-Werror: true
-  serversession-frontend-snap:
-    lib-Werror: true
-  serversession-frontend-wai:
-    lib-Werror: true
-  serversession-frontend-yesod:
-    lib-Werror: true
-extra-deps:
-  - snap-1.0.0.1
-  - heist-1.0.1.0
-  - map-syntax-0.2.0.2

stack_nightly.yaml

@@ -1,29 +0,0 @@
-resolver: nightly-2017-02-02
-packages:
-  - serversession
-  - serversession-backend-acid-state
-  - serversession-backend-persistent
-  - serversession-backend-redis
-  - serversession-frontend-snap
-  - serversession-frontend-wai
-  - serversession-frontend-yesod
-  - examples/serversession-example-yesod-persistent
-flags:
-  serversession:
-    lib-Werror: true
-  serversession-backend-acid-state:
-    lib-Werror: true
-  serversession-backend-persistent:
-    lib-Werror: true
-  serversession-backend-redis:
-    lib-Werror: true
-  serversession-frontend-snap:
-    lib-Werror: true
-  serversession-frontend-wai:
-    lib-Werror: true
-  serversession-frontend-yesod:
-    lib-Werror: true
-extra-deps:
-  - snap-1.0.0.1
-  - heist-1.0.1.0
-  - map-syntax-0.2.0.2