fix: Fix Travis CI builds and (some) tests

https://config.travis-ci.com/explore recommendations:
  * Set the `os` key
  * Removes the `sudo` key

Fixes:
  * Missing dependencies

Cleanups:
  * Set `build_command_prepend` and `build_command` to match the process
    performed by the before_script and script.
  * Removed unnecessary apt package dependencies.
  * Ran the file through prettier (https://prettier.io/).

Enhancements:
  * Bumps dist to Ubuntu 18.04 (Bionic)
    * This bump allows us to install a few packages that were previously
      installed manually.
  * Added a Clang build.

TODOs:
  * X11 tests are broken. I've commented them out for the time being.

1 files changed, 75 insertions, 88 deletions

diff --git a/.travis.yml b/.travis.yml
index 03918b21..fb05ba4b 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,105 +1,92 @@
-
-sudo: required
-dist: trusty
+os: linux
+dist: bionic
 language: c
 env:
   global:
-   # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created
-   #   via the "travis encrypt" command using the project repo's public key
-   - secure: "Uodrn3x36plX2yk4+c7eimCuv7j6p6n1XCNbNEYxibRX77730eQMCVS0BvM40OgD7m5K9s2hIQaMV7EMj3qKuRmemULDVJVTgNd1fbx6t4BhYh+Hrf6FhsNcm9nFxvQQrdJAVSOwIAlrUilVFotDRt9qKqLwwZiBKIs5gBPcHQY="
+    # The next declaration is the encrypted COVERITY_SCAN_TOKEN, created via
+    # the "travis encrypt" command using the project repo's public key
+    - secure: "Uodrn3x36plX2yk4+c7eimCuv7j6p6n1XCNbNEYxibRX77730eQMCVS0BvM40OgD7m5K9s2hIQaMV7EMj3qKuRmemULDVJVTgNd1fbx6t4BhYh+Hrf6FhsNcm9nFxvQQrdJAVSOwIAlrUilVFotDRt9qKqLwwZiBKIs5gBPcHQY="
 
 addons:
-    coverity_scan:
-      project:
-        name: "DaveDavenport/rofi"
-        description: "Build submitted via Travis CI"
-      notification_email: qball@gmpclient.org
-      build_command_prepend: "autoreconf -i;./configure; make clean"
-      build_command:   "make"
-      branch_pattern: coverity_scan
-    apt:
-        packages:
-            - python3.5
-            - autoconf
-            - automake
-            - make
-            - xutils-dev
-            - libpango1.0-dev
-            - libcairo2-dev
-            - libstartup-notification0-dev
-            - libxcb-ewmh-dev
-            - libxcb-icccm4-dev
-            - libxcb-util0-dev
-            - libxcb-xinerama0-dev
-            - libxcb-xkb-dev
-            - libxcb-randr0-dev
-            - libxcb1-dev
-            - libxkbcommon-dev
-            - libxkbcommon-x11-dev
-            - xvfb
-            - discount
-            - xdotool
-            - fluxbox
-            - xterm
-            - gdb
-            - lcov
-            - doxygen
-            - graphviz
-            - texinfo
-            - texi2html
-            - xfonts-base
+  # TODO: Is this addon still actively used?
+  coverity_scan:
+    project:
+      name: "DaveDavenport/rofi"
+      description: "Build submitted via Travis CI"
+    notification_email: qball@gmpclient.org
+    build_command_prepend: "meson setup build"
+    build_command: "ninja -C build"
+    branch_pattern: coverity_scan
+  apt:
+    packages:
+      - check
+      - discount
+      - doxygen
+      - fluxbox
+      - gdb
+      - graphviz
+      - lcov
+      - libpango1.0-dev
+      - libstartup-notification0-dev
+      - libxcb-ewmh-dev
+      - libxcb-icccm4-dev
+      - libxcb-randr0-dev
+      - libxcb-util0-dev
+      - libxcb-xinerama0-dev
+      - libxcb-xkb-dev
+      - libxcb-xrm-dev
+      - libxkbcommon-dev
+      - libxkbcommon-dev
+      - libxkbcommon-x11-dev
+      - ninja-build
+      - python3-pip
+      - python3-setuptools
+      - python3-wheel
+      - texi2html
+      - texinfo
+      - xdotool
+      - xfonts-base
+      - xterm
+      - xutils-dev
 
 compiler:
-    - gcc
-
-before_install:
-    - sudo add-apt-repository -y 'deb https://archive.ubuntu.com/ubuntu trusty-backports main restricted universe multiverse'
-    - sudo add-apt-repository -y 'deb https://debian.jpleau.ca/ jessie-backports main contrib non-free'
-    - sudo apt-get update -qq
-    - echo -n | openssl s_client -connect scan.coverity.com:443 | sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' | sudo tee -a /etc/ssl/certs/ca-
-
+  - clang
+  - gcc
 
-# TODO: We install xkbcommon here, until Travis use an up-to-date enough Ubuntu
+# TODO: Potentially switch to coverxygen (active project with the same goal)
+# at some point in the future?
 install:
-    - sudo apt-get install -y --force-yes flex/trusty-backports libfl-dev/trusty-backports
-    - wget https://github.com/mesonbuild/meson/releases/download/0.47.0/meson-0.47.0.tar.gz
-    - tar xf meson-0.47.0.tar.gz
-    - wget https://github.com/ninja-build/ninja/releases/download/v1.7.2/ninja-linux.zip
-    - export MESON=$(pwd)/meson-0.47.0/meson.py
-    - unzip ninja-linux.zip
-    - export PATH=$(pwd):$PATH
-    - git clone https://github.com/alobbs/doxy-coverage
-    - git clone --recursive https://github.com/Airblader/xcb-util-xrm.git
-    - cd xcb-util-xrm
-    - ./autogen.sh --prefix=/usr
-    - make
-    - sudo make install
-    - cd -
-    - git clone https://github.com/libcheck/check/ -b 0.11.0
-    - cd check
-    - autoreconf -i
-    - TEX="false" ./configure --prefix=/usr/
-    - make
-    - sudo make install
-    - cd -
+  # doxy-coverage is not packaged in Ubuntu 18.04 (Bionic), clone the helper
+  # scripts manually:
+  - git clone https://github.com/alobbs/doxy-coverage
+  # Ubuntu's meson version is outdated. Use pip to install a more recent
+  # release:
+  - pip3 install --user meson
+  # ~/.local/bin is not a part of $PATH by default. Update $PATH to include it:
+  - PATH="$PATH:$HOME/.local/bin"
 
 before_script:
-    - python3.5 ${MESON} build -Db_coverage=true
+  # Configure the build directory with meson:
+  - meson setup build
 
+# TODO: Fix X11 tests (and check whether or not changing the user's resource
+#       limit is still required for the X11 tests).
 script:
-    - ninja -C build
-    - ninja -C build test
-    - ulimit -c unlimited
-    - ninja -C build test-x
-    - ninja -C build doc/html 2>&1 > doxygen.log
-    - test $(grep -c warning doxygen.log) -eq 0
-    - ./doxy-coverage/doxy-coverage.py build/doc/html/xml/
+  # Build the project:
+  - ninja -C build
+  # Run tests:
+  - ninja -C build test
+  #- ulimit -c unlimited
+  #- ninja -C build test-x
+  - ninja -C build doc/html 2>&1 > doxygen.log
+  - test $(grep -c warning doxygen.log) -eq 0
+  - ./doxy-coverage/doxy-coverage.py build/doc/html/xml/
 
 after_success:
-      - bash <(curl -s https://codecov.io/bash)
+  - bash <(curl -s https://codecov.io/bash)
 
 notifications:
-    webhooks:
-        urls:
-            - secure: "AqDM5SkWJPSBeCiyGdXzHYLnFCML/vKxWW/0wE00ocX+97Fa5ixeU7apMJ0OMZ0ZQVXG96xVtlJ513ZSpnRYHx6FF+Ivvw5pYeZjKHqtxThEhOueW1YynYWMX7HJrA4P19ollqRLrtsJqG6x7BhVEnIyhyu9eXtgj6hiI70F0SE="
-        on_success: change
+  webhooks:
+    urls:
+      - secure: "AqDM5SkWJPSBeCiyGdXzHYLnFCML/vKxWW/0wE00ocX+97Fa5ixeU7apMJ0OMZ0ZQVXG96xVtlJ513ZSpnRYHx6FF+Ivvw5pYeZjKHqtxThEhOueW1YynYWMX7HJrA4P19ollqRLrtsJqG6x7BhVEnIyhyu9eXtgj6hiI70F0SE="
+    on_success: change