Use "phase" script for travis build phases.

This is the first step towards unifying travis configs for toxcore,
hstox, and qtox.

.travis.yml

@@ -2,14 +2,14 @@ language: c
 
 matrix:
   include:
-    - env: BUILD=hstox ENV=linux
+    - env: JOB=hstox ENV=linux
       language: haskell
       ghc: 7.8
-    - env: BUILD=toxcore ENV=linux
+    - env: JOB=toxcore ENV=linux
       compiler: clang
-    - env: BUILD=toxcore ENV=linux
+    - env: JOB=toxcore ENV=linux
       compiler: gcc
-    - env: BUILD=autotools ENV=linux
+    - env: JOB=autotools ENV=linux
       compiler: clang
 
 addons:
@@ -38,9 +38,9 @@ cache:
     - $HOME/.ghc
     - $HOME/cache
 
-install:      other/travis/${BUILD}-install
-script:       other/travis/${BUILD}-script
-after_script: other/travis/${BUILD}-after_script
+install:      other/travis/phase $JOB $ENV install
+script:       other/travis/phase $JOB $ENV script
+after_script: other/travis/phase $JOB $ENV after_script
 
 notifications:
   irc: "chat.freenode.net#toktok-status"

other/travis/phase

@@ -0,0 +1,22 @@
+#!/bin/sh
+
+set -e -u -x
+
+JOB="$1"
+ENV="$2"
+PHASE="$3"
+
+. "other/travis/env.sh"
+. "other/travis/env-$ENV.sh"
+
+try_source() {
+  SCRIPT="other/travis/$1"
+  if [ -f "$SCRIPT" ]; then
+    . "$SCRIPT"
+  fi
+}
+
+try_source "$PHASE"
+try_source "$ENV-$PHASE"
+try_source "$JOB-$PHASE"
+try_source "$JOB-$ENV-$PHASE"