api: LXR_PROJ_DIR is authoritative (#129)

Always set LXR_DATA_DIR and LXR_REPO_DIR based on LXR_PROJ_DIR.
Fixes #129.

Also, verbose output from Travis tests.

.travis.yml

@@ -16,4 +16,4 @@ before_install:
   - sudo dpkg -i universal-ctags_0+git20221222-0ubuntu1_amd64.deb
 
 script:
-  - prove
+  - prove -v

api/api.py

@@ -5,13 +5,17 @@ import os
 
 import falcon
 
-ELIXIR_DIR = os.path.dirname(__file__) + '/..'
+ELIXIR_DIR = os.path.dirname(os.path.realpath(__file__)) + '/..'
 
 def build_query(env, project):
-    if 'LXR_DATA_DIR' not in os.environ or 'LXR_REPO_DIR' not in os.environ:
+    try:
         basedir = env['LXR_PROJ_DIR']
-        os.environ['LXR_DATA_DIR']= basedir + '/' + project + '/data'
-        os.environ['LXR_REPO_DIR'] = basedir + '/' + project + '/repo'
+    except KeyError:
+        basedir = os.environ['LXR_PROJ_DIR']
+        # fail if it's not defined either place
+
+    os.environ['LXR_DATA_DIR']= basedir + '/' + project + '/data'
+    os.environ['LXR_REPO_DIR'] = basedir + '/' + project + '/repo'
 
     import sys
     sys.path = [ ELIXIR_DIR ] + sys.path