print glutin events if --print-events is passed

When debugging many issues, it's often very helpful to have the raw
glutin events printed out to stderr as they come in. This does that.

Note that since `glutin::Event` doesn't implement `Display`, we just use
rust's debugging output for now via `{:?}`.

1 files changed, 3 insertions, 0 deletions

diff --git a/src/cli.rs b/src/cli.rs
index e95114c7..8500ebab 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -16,6 +16,7 @@ use index::{Line, Column};
 
 /// Options specified on the command line
 pub struct Options {
+    pub print_events: bool,
     pub ref_test: bool,
     pub columns: Column,
     pub lines: Line,
@@ -25,6 +26,7 @@ pub struct Options {
 impl Default for Options {
     fn default() -> Options {
         Options {
+            print_events: false,
             ref_test: false,
             columns: Column(80),
             lines: Line(24),
@@ -43,6 +45,7 @@ impl Options {
             match &arg[..] {
                 // Generate ref test
                 "--ref-test" => options.ref_test = true,
+                "--print-events" => options.print_events = true,
                 // Set dimensions
                 "-d" | "--dimensions" => {
                     args_iter.next()