Include stack installation in CI timeout mechanism

This will help to abort CI builds early in order to preserve the cache
if necessary.

.travis.yml

@@ -28,13 +28,9 @@ addons:
 before_install:
   - mkdir -p ~/.local/bin
   - export PATH=$HOME/.local/bin:$PATH
-  - curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
-  - stack setup
-  - stack --version
-  - stack install alex happy
 
 script:
-  - ./travis-script.sh
+  - ./travis/timeout.sh ./travis/script.sh
 
 notifications:
   email: true

travis/script.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+
+set -x
+
+curl -L https://www.stackage.org/stack/linux-x86_64 | tar xz --wildcards --strip-components=1 -C ~/.local/bin '*/stack'
+stack setup
+stack --version
+stack install alex happy
+stack --no-terminal --jobs=1 build --only-dependencies
+stack --no-terminal --jobs=1 test --flag pursuit:-dev --pedantic

travis/timeout.sh

@@ -0,0 +1,17 @@
+#!/bin/bash
+
+timeout 40m $@
+ret=$?
+case "$ret" in
+  0)
+    # continue
+    ;;
+  124)
+    echo "Timed out while executing command: $@."
+    echo "Try building again by pushing a new commit."
+    exit 1
+    ;;
+  *)
+    exit "$ret"
+    ;;
+esac