Add support for recording/running ref tests

Ref tests use a recording of the terminal protocol and a serialization
of the grid state to check that the parsing and action handling systems
produce the correct result. Ref tests may be recorded by running
alacritty with `--ref-test` and closing the terminal by using the window
"X" button. At that point, the recording is fully written to disk, and a
serialization of important state is recorded. Those files should be
moved to an appropriate folder in the `tests/ref/` tree, and the
`ref_test!` macro invocation should be updated accordingly.

A couple of changes were necessary to make this work:

* Ref tests shouldn't create a pty; the pty was refactored out of the
  `Term` type.
* Repeatable lines/cols were needed; on startup, the terminal is resized
* by default to 80x24 though that may be changed by passing
  `--dimensions w h`.
* Calculating window size based on desired rows/columns and font metrics
  required making load_font callable multiple times.
* Refactor types into library crate so they may be imported in an
  integration test.
* A whole bunch of types needed symmetric serialization and
  deserialization. Mostly this was just adding derives, but the custom
  deserialization of Rgb had to change to a deserialize_with function.

This initially adds one ref test as a sanity check, and more will be
added in subsequent commits. This initial ref tests just starts the
terminal and runs `ll`.

1 files changed, 7 insertions, 0 deletions

diff --git a/Cargo.toml b/Cargo.toml
index 9da6e7ca..c17c585f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -5,6 +5,11 @@ authors = ["Joe Wilm <joe@jwilm.com>"]
 license = "Apache-2.0"
 build = "build.rs"
 
+[[bin]]
+doc = false
+path = "src/main.rs"
+name = "alacritty"
+
 [dependencies]
 libc = "*"
 cgmath = "0.7"
@@ -18,6 +23,7 @@ serde_yaml = "0.5"
 serde_derive = "0.8"
 vte = "0.1.2"
 mio = "0.6"
+serde_json = "*"
 copypasta = { path = "./copypasta" }
 
 [features]
@@ -32,5 +38,6 @@ gl_generator = "0.5"
 git = "https://github.com/jwilm/glutin"
 rev = "78838c1e1497dc8a1b1c8f69da7a6f3cd7da15c1"
 
+
 [profile.release]
 debug = true